43c518d197
In commit 92923ca3aa
"mm: meminit: only set page reserved in the memblock region"
we dropped setting the reserved bits for all pages. This results in some warnings
on ia64:
put_kernel_page: page at 0xe000000005588000 not in reserved memory
put_kernel_page: page at 0xe000000005588000 not in reserved memory
put_kernel_page: page at 0xe000000005580000 not in reserved memory
put_kernel_page: page at 0xe000000005580000 not in reserved memory
put_kernel_page: page at 0xe000000005580000 not in reserved memory
put_kernel_page: page at 0xe000000005580000 not in reserved memory
the two different pages match up with two objects from the loaded kernel
that get mapped by arch/ia64/mm/init.c:setup_gate()
a000000101588000 D __start_gate_section
a000000101580000 D empty_zero_page
In a discussion with Mel Gorman:
http://lkml.kernel.org/r/20150526102219.GB13750%40suse.de
he suggested that while the preferred approach might be to
set the reserved bit for these pages, it would also be OK
to just drop the test:
"as it's a debugging check that is ia-64 specific"
After hunting around a bit and failin to find a good place to mark these
pages as reserved - I decided to just delete the test.
Signed-off-by: Tony Luck <tony.luck@intel.com>
734 lines
19 KiB
C
734 lines
19 KiB
C
/*
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* Initialize MMU support.
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*
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* Copyright (C) 1998-2003 Hewlett-Packard Co
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* David Mosberger-Tang <davidm@hpl.hp.com>
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/bootmem.h>
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#include <linux/efi.h>
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#include <linux/elf.h>
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#include <linux/memblock.h>
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#include <linux/mm.h>
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#include <linux/mmzone.h>
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#include <linux/module.h>
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#include <linux/personality.h>
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#include <linux/reboot.h>
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#include <linux/slab.h>
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#include <linux/swap.h>
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#include <linux/proc_fs.h>
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#include <linux/bitops.h>
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#include <linux/kexec.h>
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#include <asm/dma.h>
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#include <asm/io.h>
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#include <asm/machvec.h>
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#include <asm/numa.h>
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#include <asm/patch.h>
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#include <asm/pgalloc.h>
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#include <asm/sal.h>
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#include <asm/sections.h>
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#include <asm/tlb.h>
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#include <asm/uaccess.h>
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#include <asm/unistd.h>
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#include <asm/mca.h>
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extern void ia64_tlb_init (void);
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unsigned long MAX_DMA_ADDRESS = PAGE_OFFSET + 0x100000000UL;
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#ifdef CONFIG_VIRTUAL_MEM_MAP
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unsigned long VMALLOC_END = VMALLOC_END_INIT;
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EXPORT_SYMBOL(VMALLOC_END);
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struct page *vmem_map;
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EXPORT_SYMBOL(vmem_map);
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#endif
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struct page *zero_page_memmap_ptr; /* map entry for zero page */
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EXPORT_SYMBOL(zero_page_memmap_ptr);
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void
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__ia64_sync_icache_dcache (pte_t pte)
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{
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unsigned long addr;
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struct page *page;
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page = pte_page(pte);
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addr = (unsigned long) page_address(page);
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if (test_bit(PG_arch_1, &page->flags))
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return; /* i-cache is already coherent with d-cache */
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flush_icache_range(addr, addr + (PAGE_SIZE << compound_order(page)));
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set_bit(PG_arch_1, &page->flags); /* mark page as clean */
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}
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/*
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* Since DMA is i-cache coherent, any (complete) pages that were written via
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* DMA can be marked as "clean" so that lazy_mmu_prot_update() doesn't have to
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* flush them when they get mapped into an executable vm-area.
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*/
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void
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dma_mark_clean(void *addr, size_t size)
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{
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unsigned long pg_addr, end;
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pg_addr = PAGE_ALIGN((unsigned long) addr);
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end = (unsigned long) addr + size;
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while (pg_addr + PAGE_SIZE <= end) {
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struct page *page = virt_to_page(pg_addr);
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set_bit(PG_arch_1, &page->flags);
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pg_addr += PAGE_SIZE;
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}
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}
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inline void
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ia64_set_rbs_bot (void)
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{
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unsigned long stack_size = rlimit_max(RLIMIT_STACK) & -16;
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if (stack_size > MAX_USER_STACK_SIZE)
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stack_size = MAX_USER_STACK_SIZE;
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current->thread.rbs_bot = PAGE_ALIGN(current->mm->start_stack - stack_size);
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}
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/*
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* This performs some platform-dependent address space initialization.
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* On IA-64, we want to setup the VM area for the register backing
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* store (which grows upwards) and install the gateway page which is
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* used for signal trampolines, etc.
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*/
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void
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ia64_init_addr_space (void)
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{
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struct vm_area_struct *vma;
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ia64_set_rbs_bot();
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/*
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* If we're out of memory and kmem_cache_alloc() returns NULL, we simply ignore
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* the problem. When the process attempts to write to the register backing store
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* for the first time, it will get a SEGFAULT in this case.
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*/
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vma = kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL);
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if (vma) {
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INIT_LIST_HEAD(&vma->anon_vma_chain);
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vma->vm_mm = current->mm;
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vma->vm_start = current->thread.rbs_bot & PAGE_MASK;
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vma->vm_end = vma->vm_start + PAGE_SIZE;
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vma->vm_flags = VM_DATA_DEFAULT_FLAGS|VM_GROWSUP|VM_ACCOUNT;
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vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
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down_write(¤t->mm->mmap_sem);
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if (insert_vm_struct(current->mm, vma)) {
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up_write(¤t->mm->mmap_sem);
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kmem_cache_free(vm_area_cachep, vma);
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return;
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}
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up_write(¤t->mm->mmap_sem);
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}
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/* map NaT-page at address zero to speed up speculative dereferencing of NULL: */
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if (!(current->personality & MMAP_PAGE_ZERO)) {
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vma = kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL);
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if (vma) {
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INIT_LIST_HEAD(&vma->anon_vma_chain);
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vma->vm_mm = current->mm;
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vma->vm_end = PAGE_SIZE;
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vma->vm_page_prot = __pgprot(pgprot_val(PAGE_READONLY) | _PAGE_MA_NAT);
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vma->vm_flags = VM_READ | VM_MAYREAD | VM_IO |
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VM_DONTEXPAND | VM_DONTDUMP;
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down_write(¤t->mm->mmap_sem);
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if (insert_vm_struct(current->mm, vma)) {
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up_write(¤t->mm->mmap_sem);
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kmem_cache_free(vm_area_cachep, vma);
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return;
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}
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up_write(¤t->mm->mmap_sem);
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}
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}
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}
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void
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free_initmem (void)
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{
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free_reserved_area(ia64_imva(__init_begin), ia64_imva(__init_end),
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-1, "unused kernel");
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}
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void __init
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free_initrd_mem (unsigned long start, unsigned long end)
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{
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/*
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* EFI uses 4KB pages while the kernel can use 4KB or bigger.
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* Thus EFI and the kernel may have different page sizes. It is
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* therefore possible to have the initrd share the same page as
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* the end of the kernel (given current setup).
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*
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* To avoid freeing/using the wrong page (kernel sized) we:
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* - align up the beginning of initrd
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* - align down the end of initrd
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*
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* | |
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* |=============| a000
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* | |
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* | |
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* | | 9000
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* |/////////////|
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* |/////////////|
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* |=============| 8000
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* |///INITRD////|
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* |/////////////|
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* |/////////////| 7000
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* | |
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* |KKKKKKKKKKKKK|
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* |=============| 6000
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* |KKKKKKKKKKKKK|
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* |KKKKKKKKKKKKK|
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* K=kernel using 8KB pages
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*
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* In this example, we must free page 8000 ONLY. So we must align up
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* initrd_start and keep initrd_end as is.
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*/
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start = PAGE_ALIGN(start);
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end = end & PAGE_MASK;
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if (start < end)
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printk(KERN_INFO "Freeing initrd memory: %ldkB freed\n", (end - start) >> 10);
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for (; start < end; start += PAGE_SIZE) {
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if (!virt_addr_valid(start))
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continue;
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free_reserved_page(virt_to_page(start));
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}
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}
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/*
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* This installs a clean page in the kernel's page table.
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*/
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static struct page * __init
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put_kernel_page (struct page *page, unsigned long address, pgprot_t pgprot)
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{
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pgd_t *pgd;
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pud_t *pud;
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pmd_t *pmd;
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pte_t *pte;
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pgd = pgd_offset_k(address); /* note: this is NOT pgd_offset()! */
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{
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pud = pud_alloc(&init_mm, pgd, address);
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if (!pud)
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goto out;
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pmd = pmd_alloc(&init_mm, pud, address);
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if (!pmd)
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goto out;
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pte = pte_alloc_kernel(pmd, address);
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if (!pte)
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goto out;
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if (!pte_none(*pte))
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goto out;
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set_pte(pte, mk_pte(page, pgprot));
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}
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out:
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/* no need for flush_tlb */
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return page;
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}
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static void __init
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setup_gate (void)
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{
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struct page *page;
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/*
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* Map the gate page twice: once read-only to export the ELF
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* headers etc. and once execute-only page to enable
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* privilege-promotion via "epc":
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*/
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page = virt_to_page(ia64_imva(__start_gate_section));
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put_kernel_page(page, GATE_ADDR, PAGE_READONLY);
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#ifdef HAVE_BUGGY_SEGREL
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page = virt_to_page(ia64_imva(__start_gate_section + PAGE_SIZE));
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put_kernel_page(page, GATE_ADDR + PAGE_SIZE, PAGE_GATE);
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#else
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put_kernel_page(page, GATE_ADDR + PERCPU_PAGE_SIZE, PAGE_GATE);
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/* Fill in the holes (if any) with read-only zero pages: */
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{
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unsigned long addr;
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for (addr = GATE_ADDR + PAGE_SIZE;
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addr < GATE_ADDR + PERCPU_PAGE_SIZE;
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addr += PAGE_SIZE)
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{
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put_kernel_page(ZERO_PAGE(0), addr,
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PAGE_READONLY);
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put_kernel_page(ZERO_PAGE(0), addr + PERCPU_PAGE_SIZE,
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PAGE_READONLY);
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}
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}
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#endif
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ia64_patch_gate();
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}
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static struct vm_area_struct gate_vma;
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static int __init gate_vma_init(void)
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{
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gate_vma.vm_mm = NULL;
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gate_vma.vm_start = FIXADDR_USER_START;
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gate_vma.vm_end = FIXADDR_USER_END;
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gate_vma.vm_flags = VM_READ | VM_MAYREAD | VM_EXEC | VM_MAYEXEC;
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gate_vma.vm_page_prot = __P101;
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return 0;
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}
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__initcall(gate_vma_init);
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struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
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{
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return &gate_vma;
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}
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int in_gate_area_no_mm(unsigned long addr)
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{
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if ((addr >= FIXADDR_USER_START) && (addr < FIXADDR_USER_END))
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return 1;
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return 0;
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}
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int in_gate_area(struct mm_struct *mm, unsigned long addr)
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{
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return in_gate_area_no_mm(addr);
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}
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void ia64_mmu_init(void *my_cpu_data)
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{
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unsigned long pta, impl_va_bits;
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extern void tlb_init(void);
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#ifdef CONFIG_DISABLE_VHPT
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# define VHPT_ENABLE_BIT 0
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#else
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# define VHPT_ENABLE_BIT 1
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#endif
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/*
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* Check if the virtually mapped linear page table (VMLPT) overlaps with a mapped
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* address space. The IA-64 architecture guarantees that at least 50 bits of
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* virtual address space are implemented but if we pick a large enough page size
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* (e.g., 64KB), the mapped address space is big enough that it will overlap with
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* VMLPT. I assume that once we run on machines big enough to warrant 64KB pages,
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* IMPL_VA_MSB will be significantly bigger, so this is unlikely to become a
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* problem in practice. Alternatively, we could truncate the top of the mapped
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* address space to not permit mappings that would overlap with the VMLPT.
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* --davidm 00/12/06
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*/
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# define pte_bits 3
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# define mapped_space_bits (3*(PAGE_SHIFT - pte_bits) + PAGE_SHIFT)
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/*
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* The virtual page table has to cover the entire implemented address space within
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* a region even though not all of this space may be mappable. The reason for
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* this is that the Access bit and Dirty bit fault handlers perform
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* non-speculative accesses to the virtual page table, so the address range of the
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* virtual page table itself needs to be covered by virtual page table.
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*/
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# define vmlpt_bits (impl_va_bits - PAGE_SHIFT + pte_bits)
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# define POW2(n) (1ULL << (n))
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impl_va_bits = ffz(~(local_cpu_data->unimpl_va_mask | (7UL << 61)));
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if (impl_va_bits < 51 || impl_va_bits > 61)
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panic("CPU has bogus IMPL_VA_MSB value of %lu!\n", impl_va_bits - 1);
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/*
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* mapped_space_bits - PAGE_SHIFT is the total number of ptes we need,
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* which must fit into "vmlpt_bits - pte_bits" slots. Second half of
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* the test makes sure that our mapped space doesn't overlap the
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* unimplemented hole in the middle of the region.
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*/
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if ((mapped_space_bits - PAGE_SHIFT > vmlpt_bits - pte_bits) ||
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(mapped_space_bits > impl_va_bits - 1))
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panic("Cannot build a big enough virtual-linear page table"
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" to cover mapped address space.\n"
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" Try using a smaller page size.\n");
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|
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/* place the VMLPT at the end of each page-table mapped region: */
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pta = POW2(61) - POW2(vmlpt_bits);
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/*
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* Set the (virtually mapped linear) page table address. Bit
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* 8 selects between the short and long format, bits 2-7 the
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* size of the table, and bit 0 whether the VHPT walker is
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* enabled.
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*/
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ia64_set_pta(pta | (0 << 8) | (vmlpt_bits << 2) | VHPT_ENABLE_BIT);
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ia64_tlb_init();
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#ifdef CONFIG_HUGETLB_PAGE
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ia64_set_rr(HPAGE_REGION_BASE, HPAGE_SHIFT << 2);
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ia64_srlz_d();
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#endif
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}
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#ifdef CONFIG_VIRTUAL_MEM_MAP
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int vmemmap_find_next_valid_pfn(int node, int i)
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{
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unsigned long end_address, hole_next_pfn;
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unsigned long stop_address;
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pg_data_t *pgdat = NODE_DATA(node);
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end_address = (unsigned long) &vmem_map[pgdat->node_start_pfn + i];
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end_address = PAGE_ALIGN(end_address);
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stop_address = (unsigned long) &vmem_map[pgdat_end_pfn(pgdat)];
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do {
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pgd_t *pgd;
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pud_t *pud;
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pmd_t *pmd;
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pte_t *pte;
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pgd = pgd_offset_k(end_address);
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if (pgd_none(*pgd)) {
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end_address += PGDIR_SIZE;
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continue;
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}
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|
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pud = pud_offset(pgd, end_address);
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if (pud_none(*pud)) {
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end_address += PUD_SIZE;
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continue;
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}
|
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|
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pmd = pmd_offset(pud, end_address);
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if (pmd_none(*pmd)) {
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end_address += PMD_SIZE;
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continue;
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}
|
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|
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pte = pte_offset_kernel(pmd, end_address);
|
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retry_pte:
|
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if (pte_none(*pte)) {
|
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end_address += PAGE_SIZE;
|
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pte++;
|
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if ((end_address < stop_address) &&
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(end_address != ALIGN(end_address, 1UL << PMD_SHIFT)))
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goto retry_pte;
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continue;
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}
|
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/* Found next valid vmem_map page */
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break;
|
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} while (end_address < stop_address);
|
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|
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end_address = min(end_address, stop_address);
|
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end_address = end_address - (unsigned long) vmem_map + sizeof(struct page) - 1;
|
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hole_next_pfn = end_address / sizeof(struct page);
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return hole_next_pfn - pgdat->node_start_pfn;
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}
|
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|
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int __init create_mem_map_page_table(u64 start, u64 end, void *arg)
|
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{
|
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unsigned long address, start_page, end_page;
|
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struct page *map_start, *map_end;
|
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int node;
|
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pgd_t *pgd;
|
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pud_t *pud;
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pmd_t *pmd;
|
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pte_t *pte;
|
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|
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map_start = vmem_map + (__pa(start) >> PAGE_SHIFT);
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map_end = vmem_map + (__pa(end) >> PAGE_SHIFT);
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|
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start_page = (unsigned long) map_start & PAGE_MASK;
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end_page = PAGE_ALIGN((unsigned long) map_end);
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node = paddr_to_nid(__pa(start));
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|
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for (address = start_page; address < end_page; address += PAGE_SIZE) {
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pgd = pgd_offset_k(address);
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if (pgd_none(*pgd))
|
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pgd_populate(&init_mm, pgd, alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE));
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pud = pud_offset(pgd, address);
|
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|
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if (pud_none(*pud))
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pud_populate(&init_mm, pud, alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE));
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pmd = pmd_offset(pud, address);
|
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|
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if (pmd_none(*pmd))
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pmd_populate_kernel(&init_mm, pmd, alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE));
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pte = pte_offset_kernel(pmd, address);
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|
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if (pte_none(*pte))
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set_pte(pte, pfn_pte(__pa(alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE)) >> PAGE_SHIFT,
|
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PAGE_KERNEL));
|
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}
|
|
return 0;
|
|
}
|
|
|
|
struct memmap_init_callback_data {
|
|
struct page *start;
|
|
struct page *end;
|
|
int nid;
|
|
unsigned long zone;
|
|
};
|
|
|
|
static int __meminit
|
|
virtual_memmap_init(u64 start, u64 end, void *arg)
|
|
{
|
|
struct memmap_init_callback_data *args;
|
|
struct page *map_start, *map_end;
|
|
|
|
args = (struct memmap_init_callback_data *) arg;
|
|
map_start = vmem_map + (__pa(start) >> PAGE_SHIFT);
|
|
map_end = vmem_map + (__pa(end) >> PAGE_SHIFT);
|
|
|
|
if (map_start < args->start)
|
|
map_start = args->start;
|
|
if (map_end > args->end)
|
|
map_end = args->end;
|
|
|
|
/*
|
|
* We have to initialize "out of bounds" struct page elements that fit completely
|
|
* on the same pages that were allocated for the "in bounds" elements because they
|
|
* may be referenced later (and found to be "reserved").
|
|
*/
|
|
map_start -= ((unsigned long) map_start & (PAGE_SIZE - 1)) / sizeof(struct page);
|
|
map_end += ((PAGE_ALIGN((unsigned long) map_end) - (unsigned long) map_end)
|
|
/ sizeof(struct page));
|
|
|
|
if (map_start < map_end)
|
|
memmap_init_zone((unsigned long)(map_end - map_start),
|
|
args->nid, args->zone, page_to_pfn(map_start),
|
|
MEMMAP_EARLY);
|
|
return 0;
|
|
}
|
|
|
|
void __meminit
|
|
memmap_init (unsigned long size, int nid, unsigned long zone,
|
|
unsigned long start_pfn)
|
|
{
|
|
if (!vmem_map)
|
|
memmap_init_zone(size, nid, zone, start_pfn, MEMMAP_EARLY);
|
|
else {
|
|
struct page *start;
|
|
struct memmap_init_callback_data args;
|
|
|
|
start = pfn_to_page(start_pfn);
|
|
args.start = start;
|
|
args.end = start + size;
|
|
args.nid = nid;
|
|
args.zone = zone;
|
|
|
|
efi_memmap_walk(virtual_memmap_init, &args);
|
|
}
|
|
}
|
|
|
|
int
|
|
ia64_pfn_valid (unsigned long pfn)
|
|
{
|
|
char byte;
|
|
struct page *pg = pfn_to_page(pfn);
|
|
|
|
return (__get_user(byte, (char __user *) pg) == 0)
|
|
&& ((((u64)pg & PAGE_MASK) == (((u64)(pg + 1) - 1) & PAGE_MASK))
|
|
|| (__get_user(byte, (char __user *) (pg + 1) - 1) == 0));
|
|
}
|
|
EXPORT_SYMBOL(ia64_pfn_valid);
|
|
|
|
int __init find_largest_hole(u64 start, u64 end, void *arg)
|
|
{
|
|
u64 *max_gap = arg;
|
|
|
|
static u64 last_end = PAGE_OFFSET;
|
|
|
|
/* NOTE: this algorithm assumes efi memmap table is ordered */
|
|
|
|
if (*max_gap < (start - last_end))
|
|
*max_gap = start - last_end;
|
|
last_end = end;
|
|
return 0;
|
|
}
|
|
|
|
#endif /* CONFIG_VIRTUAL_MEM_MAP */
|
|
|
|
int __init register_active_ranges(u64 start, u64 len, int nid)
|
|
{
|
|
u64 end = start + len;
|
|
|
|
#ifdef CONFIG_KEXEC
|
|
if (start > crashk_res.start && start < crashk_res.end)
|
|
start = crashk_res.end;
|
|
if (end > crashk_res.start && end < crashk_res.end)
|
|
end = crashk_res.start;
|
|
#endif
|
|
|
|
if (start < end)
|
|
memblock_add_node(__pa(start), end - start, nid);
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
find_max_min_low_pfn (u64 start, u64 end, void *arg)
|
|
{
|
|
unsigned long pfn_start, pfn_end;
|
|
#ifdef CONFIG_FLATMEM
|
|
pfn_start = (PAGE_ALIGN(__pa(start))) >> PAGE_SHIFT;
|
|
pfn_end = (PAGE_ALIGN(__pa(end - 1))) >> PAGE_SHIFT;
|
|
#else
|
|
pfn_start = GRANULEROUNDDOWN(__pa(start)) >> PAGE_SHIFT;
|
|
pfn_end = GRANULEROUNDUP(__pa(end - 1)) >> PAGE_SHIFT;
|
|
#endif
|
|
min_low_pfn = min(min_low_pfn, pfn_start);
|
|
max_low_pfn = max(max_low_pfn, pfn_end);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Boot command-line option "nolwsys" can be used to disable the use of any light-weight
|
|
* system call handler. When this option is in effect, all fsyscalls will end up bubbling
|
|
* down into the kernel and calling the normal (heavy-weight) syscall handler. This is
|
|
* useful for performance testing, but conceivably could also come in handy for debugging
|
|
* purposes.
|
|
*/
|
|
|
|
static int nolwsys __initdata;
|
|
|
|
static int __init
|
|
nolwsys_setup (char *s)
|
|
{
|
|
nolwsys = 1;
|
|
return 1;
|
|
}
|
|
|
|
__setup("nolwsys", nolwsys_setup);
|
|
|
|
void __init
|
|
mem_init (void)
|
|
{
|
|
int i;
|
|
|
|
BUG_ON(PTRS_PER_PGD * sizeof(pgd_t) != PAGE_SIZE);
|
|
BUG_ON(PTRS_PER_PMD * sizeof(pmd_t) != PAGE_SIZE);
|
|
BUG_ON(PTRS_PER_PTE * sizeof(pte_t) != PAGE_SIZE);
|
|
|
|
#ifdef CONFIG_PCI
|
|
/*
|
|
* This needs to be called _after_ the command line has been parsed but _before_
|
|
* any drivers that may need the PCI DMA interface are initialized or bootmem has
|
|
* been freed.
|
|
*/
|
|
platform_dma_init();
|
|
#endif
|
|
|
|
#ifdef CONFIG_FLATMEM
|
|
BUG_ON(!mem_map);
|
|
#endif
|
|
|
|
set_max_mapnr(max_low_pfn);
|
|
high_memory = __va(max_low_pfn * PAGE_SIZE);
|
|
free_all_bootmem();
|
|
mem_init_print_info(NULL);
|
|
|
|
/*
|
|
* For fsyscall entrpoints with no light-weight handler, use the ordinary
|
|
* (heavy-weight) handler, but mark it by setting bit 0, so the fsyscall entry
|
|
* code can tell them apart.
|
|
*/
|
|
for (i = 0; i < NR_syscalls; ++i) {
|
|
extern unsigned long fsyscall_table[NR_syscalls];
|
|
extern unsigned long sys_call_table[NR_syscalls];
|
|
|
|
if (!fsyscall_table[i] || nolwsys)
|
|
fsyscall_table[i] = sys_call_table[i] | 1;
|
|
}
|
|
setup_gate();
|
|
}
|
|
|
|
#ifdef CONFIG_MEMORY_HOTPLUG
|
|
int arch_add_memory(int nid, u64 start, u64 size)
|
|
{
|
|
pg_data_t *pgdat;
|
|
struct zone *zone;
|
|
unsigned long start_pfn = start >> PAGE_SHIFT;
|
|
unsigned long nr_pages = size >> PAGE_SHIFT;
|
|
int ret;
|
|
|
|
pgdat = NODE_DATA(nid);
|
|
|
|
zone = pgdat->node_zones +
|
|
zone_for_memory(nid, start, size, ZONE_NORMAL);
|
|
ret = __add_pages(nid, zone, start_pfn, nr_pages);
|
|
|
|
if (ret)
|
|
printk("%s: Problem encountered in __add_pages() as ret=%d\n",
|
|
__func__, ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_MEMORY_HOTREMOVE
|
|
int arch_remove_memory(u64 start, u64 size)
|
|
{
|
|
unsigned long start_pfn = start >> PAGE_SHIFT;
|
|
unsigned long nr_pages = size >> PAGE_SHIFT;
|
|
struct zone *zone;
|
|
int ret;
|
|
|
|
zone = page_zone(pfn_to_page(start_pfn));
|
|
ret = __remove_pages(zone, start_pfn, nr_pages);
|
|
if (ret)
|
|
pr_warn("%s: Problem encountered in __remove_pages() as"
|
|
" ret=%d\n", __func__, ret);
|
|
|
|
return ret;
|
|
}
|
|
#endif
|
|
#endif
|
|
|
|
/**
|
|
* show_mem - give short summary of memory stats
|
|
*
|
|
* Shows a simple page count of reserved and used pages in the system.
|
|
* For discontig machines, it does this on a per-pgdat basis.
|
|
*/
|
|
void show_mem(unsigned int filter)
|
|
{
|
|
int total_reserved = 0;
|
|
unsigned long total_present = 0;
|
|
pg_data_t *pgdat;
|
|
|
|
printk(KERN_INFO "Mem-info:\n");
|
|
show_free_areas(filter);
|
|
printk(KERN_INFO "Node memory in pages:\n");
|
|
for_each_online_pgdat(pgdat) {
|
|
unsigned long present;
|
|
unsigned long flags;
|
|
int reserved = 0;
|
|
int nid = pgdat->node_id;
|
|
int zoneid;
|
|
|
|
if (skip_free_areas_node(filter, nid))
|
|
continue;
|
|
pgdat_resize_lock(pgdat, &flags);
|
|
|
|
for (zoneid = 0; zoneid < MAX_NR_ZONES; zoneid++) {
|
|
struct zone *zone = &pgdat->node_zones[zoneid];
|
|
if (!populated_zone(zone))
|
|
continue;
|
|
|
|
reserved += zone->present_pages - zone->managed_pages;
|
|
}
|
|
present = pgdat->node_present_pages;
|
|
|
|
pgdat_resize_unlock(pgdat, &flags);
|
|
total_present += present;
|
|
total_reserved += reserved;
|
|
printk(KERN_INFO "Node %4d: RAM: %11ld, rsvd: %8d, ",
|
|
nid, present, reserved);
|
|
}
|
|
printk(KERN_INFO "%ld pages of RAM\n", total_present);
|
|
printk(KERN_INFO "%d reserved pages\n", total_reserved);
|
|
printk(KERN_INFO "Total of %ld pages in page table cache\n",
|
|
quicklist_total_size());
|
|
printk(KERN_INFO "%ld free buffer pages\n", nr_free_buffer_pages());
|
|
}
|