8f03d6ce4e
mm/vmalloc.c: In function 'unmap_kernel_range': mm/vmalloc.c:75: warning: unused variable 'start' make it a C function so that the compiler thinks it used its arguments. Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
109 lines
2.7 KiB
C
109 lines
2.7 KiB
C
#ifndef _X8664_TLBFLUSH_H
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#define _X8664_TLBFLUSH_H
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#include <linux/mm.h>
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#include <linux/sched.h>
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#include <asm/processor.h>
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#include <asm/system.h>
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static inline void __flush_tlb(void)
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{
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write_cr3(read_cr3());
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}
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static inline void __flush_tlb_all(void)
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{
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unsigned long cr4 = read_cr4();
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write_cr4(cr4 & ~X86_CR4_PGE); /* clear PGE */
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write_cr4(cr4); /* write old PGE again and flush TLBs */
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}
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#define __flush_tlb_one(addr) \
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__asm__ __volatile__("invlpg (%0)" :: "r" (addr) : "memory")
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/*
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* TLB flushing:
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*
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* - flush_tlb() flushes the current mm struct TLBs
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* - flush_tlb_all() flushes all processes TLBs
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* - flush_tlb_mm(mm) flushes the specified mm context TLB's
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* - flush_tlb_page(vma, vmaddr) flushes one page
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* - flush_tlb_range(vma, start, end) flushes a range of pages
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* - flush_tlb_kernel_range(start, end) flushes a range of kernel pages
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* - flush_tlb_pgtables(mm, start, end) flushes a range of page tables
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*
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* x86-64 can only flush individual pages or full VMs. For a range flush
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* we always do the full VM. Might be worth trying if for a small
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* range a few INVLPGs in a row are a win.
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*/
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#ifndef CONFIG_SMP
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#define flush_tlb() __flush_tlb()
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#define flush_tlb_all() __flush_tlb_all()
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#define local_flush_tlb() __flush_tlb()
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static inline void flush_tlb_mm(struct mm_struct *mm)
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{
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if (mm == current->active_mm)
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__flush_tlb();
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}
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static inline void flush_tlb_page(struct vm_area_struct *vma,
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unsigned long addr)
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{
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if (vma->vm_mm == current->active_mm)
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__flush_tlb_one(addr);
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}
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static inline void flush_tlb_range(struct vm_area_struct *vma,
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unsigned long start, unsigned long end)
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{
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if (vma->vm_mm == current->active_mm)
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__flush_tlb();
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}
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#else
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#include <asm/smp.h>
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#define local_flush_tlb() \
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__flush_tlb()
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extern void flush_tlb_all(void);
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extern void flush_tlb_current_task(void);
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extern void flush_tlb_mm(struct mm_struct *);
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extern void flush_tlb_page(struct vm_area_struct *, unsigned long);
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#define flush_tlb() flush_tlb_current_task()
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static inline void flush_tlb_range(struct vm_area_struct * vma, unsigned long start, unsigned long end)
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{
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flush_tlb_mm(vma->vm_mm);
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}
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#define TLBSTATE_OK 1
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#define TLBSTATE_LAZY 2
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/* Roughly an IPI every 20MB with 4k pages for freeing page table
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ranges. Cost is about 42k of memory for each CPU. */
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#define ARCH_FREE_PTE_NR 5350
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#endif
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static inline void flush_tlb_kernel_range(unsigned long start,
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unsigned long end)
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{
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flush_tlb_all();
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}
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static inline void flush_tlb_pgtables(struct mm_struct *mm,
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unsigned long start, unsigned long end)
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{
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/* x86_64 does not keep any page table caches in a software TLB.
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The CPUs do in their hardware TLBs, but they are handled
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by the normal TLB flushing algorithms. */
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}
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#endif /* _X8664_TLBFLUSH_H */
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