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mm: enhance free_reserved_area() to support poisoning memory with zero

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Address more review comments from last round of code review.
1) Enhance free_reserved_area() to support poisoning freed memory with
   pattern '0'. This could be used to get rid of poison_init_mem()
   on ARM64.
2) A previous patch has disabled memory poison for initmem on s390
   by mistake, so restore to the original behavior.
3) Remove redundant PAGE_ALIGN() when calling free_reserved_area().

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: <sworddragon2@aol.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Jianguo Wu <wujianguo@huawei.com>
Cc: Joonsoo Kim <js1304@gmail.com>
Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Michel Lespinasse <walken@google.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Tang Chen <tangchen@cn.fujitsu.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wen Congyang <wency@cn.fujitsu.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jiang Liu 2013-07-03 15:02:51 -07:00 committed by Linus Torvalds
parent 11199692d8
commit dbe67df4ba
26 changed files with 49 additions and 53 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
arch/alpha/kernel/sys_nautilus.c
View file

@ -239,7 +239,7 @@ nautilus_init_pci(void)
memtop = pci_mem;
if (memtop > alpha_mv.min_mem_address) {
free_reserved_area(__va(alpha_mv.min_mem_address),
__va(memtop), 0, NULL);
__va(memtop), -1, NULL);
printk("nautilus_init_pci: %ldk freed\n",
(memtop - alpha_mv.min_mem_address) >> 10);
}

4
arch/alpha/mm/init.c
View file

@ -319,13 +319,13 @@ mem_init(void)
void
free_initmem(void)
{
free_initmem_default(0);
free_initmem_default(-1);
}
#ifdef CONFIG_BLK_DEV_INITRD
void
free_initrd_mem(unsigned long start, unsigned long end)
{
free_reserved_area((void *)start, (void *)end, 0, "initrd");
free_reserved_area((void *)start, (void *)end, -1, "initrd");
}
#endif

4
arch/arc/mm/init.c
View file

@ -146,13 +146,13 @@ void __init mem_init(void)
*/
void __init_refok free_initmem(void)
{
free_initmem_default(0);
free_initmem_default(-1);
}
#ifdef CONFIG_BLK_DEV_INITRD
void __init free_initrd_mem(unsigned long start, unsigned long end)
{
free_reserved_area((void *)start, (void *)end, 0, "initrd");
free_reserved_area((void *)start, (void *)end, -1, "initrd");
}
#endif

8
arch/arm/mm/init.c
View file

@ -601,7 +601,7 @@ void __init mem_init(void)
#ifdef CONFIG_SA1111
/* now that our DMA memory is actually so designated, we can free it */
free_reserved_area(__va(PHYS_PFN_OFFSET), swapper_pg_dir, 0, NULL);
free_reserved_area(__va(PHYS_PFN_OFFSET), swapper_pg_dir, -1, NULL);
#endif
free_highpages();
@ -729,12 +729,12 @@ void free_initmem(void)
extern char __tcm_start, __tcm_end;
poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start);
free_reserved_area(&__tcm_start, &__tcm_end, 0, "TCM link");
free_reserved_area(&__tcm_start, &__tcm_end, -1, "TCM link");
#endif
poison_init_mem(__init_begin, __init_end - __init_begin);
if (!machine_is_integrator() && !machine_is_cintegrator())
free_initmem_default(0);
free_initmem_default(-1);
}
#ifdef CONFIG_BLK_DEV_INITRD
@ -745,7 +745,7 @@ void free_initrd_mem(unsigned long start, unsigned long end)
{
if (!keep_initrd) {
poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
free_reserved_area((void *)start, (void *)end, 0, "initrd");
free_reserved_area((void *)start, (void *)end, -1, "initrd");
}
}

4
arch/arm64/mm/init.c
View file

@ -387,7 +387,7 @@ void __init mem_init(void)
void free_initmem(void)
{
poison_init_mem(__init_begin, __init_end - __init_begin);
free_initmem_default(0);
free_initmem_default(-1);
}
#ifdef CONFIG_BLK_DEV_INITRD
@ -398,7 +398,7 @@ void free_initrd_mem(unsigned long start, unsigned long end)
{
if (!keep_initrd) {
poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
free_reserved_area((void *)start, (void *)end, 0, "initrd");
free_reserved_area((void *)start, (void *)end, -1, "initrd");
}
}

4
arch/avr32/mm/init.c
View file

@ -148,12 +148,12 @@ void __init mem_init(void)
void free_initmem(void)
{
free_initmem_default(0);
free_initmem_default(-1);
}
#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long start, unsigned long end)
{
free_reserved_area((void *)start, (void *)end, 0, "initrd");
free_reserved_area((void *)start, (void *)end, -1, "initrd");
}
#endif

4
arch/blackfin/mm/init.c
View file

@ -133,7 +133,7 @@ void __init mem_init(void)
void __init free_initrd_mem(unsigned long start, unsigned long end)
{
#ifndef CONFIG_MPU
free_reserved_area((void *)start, (void *)end, 0, "initrd");
free_reserved_area((void *)start, (void *)end, -1, "initrd");
#endif
}
#endif
@ -141,7 +141,7 @@ void __init free_initrd_mem(unsigned long start, unsigned long end)
void __init_refok free_initmem(void)
{
#if defined CONFIG_RAMKERNEL && !defined CONFIG_MPU
free_initmem_default(0);
free_initmem_default(-1);
if (memory_start == (unsigned long)(&__init_end))
memory_start = (unsigned long)(&__init_begin);
#endif

4
arch/c6x/mm/init.c
View file

@ -78,11 +78,11 @@ void __init mem_init(void)
#ifdef CONFIG_BLK_DEV_INITRD
void __init free_initrd_mem(unsigned long start, unsigned long end)
{
free_reserved_area((void *)start, (void *)end, 0, "initrd");
free_reserved_area((void *)start, (void *)end, -1, "initrd");
}
#endif
void __init free_initmem(void)
{
free_initmem_default(0);
free_initmem_default(-1);
}

2
arch/cris/mm/init.c
View file

@ -65,5 +65,5 @@ mem_init(void)
void
free_initmem(void)
{
free_initmem_default(0);
free_initmem_default(-1);
}

4
arch/frv/mm/init.c
View file

@ -162,7 +162,7 @@ void __init mem_init(void)
void free_initmem(void)
{
#if defined(CONFIG_RAMKERNEL) && !defined(CONFIG_PROTECT_KERNEL)
free_initmem_default(0);
free_initmem_default(-1);
#endif
} /* end free_initmem() */
@ -173,6 +173,6 @@ void free_initmem(void)
#ifdef CONFIG_BLK_DEV_INITRD
void __init free_initrd_mem(unsigned long start, unsigned long end)
{
free_reserved_area((void *)start, (void *)end, 0, "initrd");
free_reserved_area((void *)start, (void *)end, -1, "initrd");
} /* end free_initrd_mem() */
#endif

4
arch/h8300/mm/init.c
View file

@ -161,7 +161,7 @@ void __init mem_init(void)
#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long start, unsigned long end)
{
free_reserved_area((void *)start, (void *)end, 0, "initrd");
free_reserved_area((void *)start, (void *)end, -1, "initrd");
}
#endif
@ -169,7 +169,7 @@ void
free_initmem(void)
{
#ifdef CONFIG_RAMKERNEL
free_initmem_default(0);
free_initmem_default(-1);
#endif
}

2
arch/ia64/mm/init.c
View file

@ -155,7 +155,7 @@ void
free_initmem (void)
{
free_reserved_area(ia64_imva(__init_begin), ia64_imva(__init_end),
0, "unused kernel");
-1, "unused kernel");
}
void __init

4
arch/m32r/mm/init.c
View file

@ -181,7 +181,7 @@ void __init mem_init(void)
*======================================================================*/
void free_initmem(void)
{
free_initmem_default(0);
free_initmem_default(-1);
}
#ifdef CONFIG_BLK_DEV_INITRD
@ -191,6 +191,6 @@ void free_initmem(void)
*======================================================================*/
void free_initrd_mem(unsigned long start, unsigned long end)
{
free_reserved_area((void *)start, (void *)end, 0, "initrd");
free_reserved_area((void *)start, (void *)end, -1, "initrd");
}
#endif

4
arch/m68k/mm/init.c
View file

@ -110,7 +110,7 @@ void __init paging_init(void)
void free_initmem(void)
{
#ifndef CONFIG_MMU_SUN3
free_initmem_default(0);
free_initmem_default(-1);
#endif /* CONFIG_MMU_SUN3 */
}
@ -202,6 +202,6 @@ void __init mem_init(void)
#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long start, unsigned long end)
{
free_reserved_area((void *)start, (void *)end, 0, "initrd");
free_reserved_area((void *)start, (void *)end, -1, "initrd");
}
#endif

4
arch/microblaze/mm/init.c
View file

@ -235,13 +235,13 @@ void __init setup_memory(void)
#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long start, unsigned long end)
{
free_reserved_area((void *)start, (void *)end, 0, "initrd");
free_reserved_area((void *)start, (void *)end, -1, "initrd");
}
#endif
void free_initmem(void)
{
free_initmem_default(0);
free_initmem_default(-1);
}
void __init mem_init(void)

4
arch/openrisc/mm/init.c
View file

@ -261,11 +261,11 @@ void __init mem_init(void)
#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long start, unsigned long end)
{
free_reserved_area((void *)start, (void *)end, 0, "initrd");
free_reserved_area((void *)start, (void *)end, -1, "initrd");
}
#endif
void free_initmem(void)
{
free_initmem_default(0);
free_initmem_default(-1);
}

4
arch/parisc/mm/init.c
View file

@ -532,7 +532,7 @@ void free_initmem(void)
* pages are no-longer executable */
flush_icache_range(init_begin, init_end);
num_physpages += free_initmem_default(0);
num_physpages += free_initmem_default(-1);
/* set up a new led state on systems shipped LED State panel */
pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE);
@ -1101,7 +1101,7 @@ void flush_tlb_all(void)
#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long start, unsigned long end)
{
num_physpages += free_reserved_area((void *)start, (void *)end, 0,
num_physpages += free_reserved_area((void *)start, (void *)end, -1,
"initrd");
}
#endif

9
arch/powerpc/kernel/kvm.c
View file

@ -750,13 +750,8 @@ EXPORT_SYMBOL_GPL(kvm_hypercall);
static __init void kvm_free_tmp(void)
{
unsigned long start, end;
start = (ulong)&kvm_tmp[kvm_tmp_index + (PAGE_SIZE - 1)] & PAGE_MASK;
end = (ulong)&kvm_tmp[ARRAY_SIZE(kvm_tmp)] & PAGE_MASK;
/* Free the tmp space we don't need */
free_reserved_area((void *)start, (void *)end, 0, NULL);
free_reserved_area(&kvm_tmp[kvm_tmp_index],
&kvm_tmp[ARRAY_SIZE(kvm_tmp)], -1, NULL);
}
static int __init kvm_guest_init(void)

2
arch/powerpc/mm/mem.c
View file

@ -407,7 +407,7 @@ void free_initmem(void)
#ifdef CONFIG_BLK_DEV_INITRD
void __init free_initrd_mem(unsigned long start, unsigned long end)
{
free_reserved_area((void *)start, (void *)end, 0, "initrd");
free_reserved_area((void *)start, (void *)end, -1, "initrd");
}
#endif

2
arch/s390/mm/init.c
View file

@ -166,7 +166,7 @@ void __init mem_init(void)
void free_initmem(void)
{
free_initmem_default(0);
free_initmem_default(POISON_FREE_INITMEM);
}
#ifdef CONFIG_BLK_DEV_INITRD

4
arch/sh/mm/init.c
View file

@ -499,13 +499,13 @@ void __init mem_init(void)
void free_initmem(void)
{
free_initmem_default(0);
free_initmem_default(-1);
}
#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long start, unsigned long end)
{
free_reserved_area((void *)start, (void *)end, 0, "initrd");
free_reserved_area((void *)start, (void *)end, -1, "initrd");
}
#endif

2
arch/um/kernel/mem.c
View file

@ -244,7 +244,7 @@ void free_initmem(void)
#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long start, unsigned long end)
{
free_reserved_area((void *)start, (void *)end, 0, "initrd");
free_reserved_area((void *)start, (void *)end, -1, "initrd");
}
#endif

4
arch/unicore32/mm/init.c
View file

@ -476,7 +476,7 @@ void __init mem_init(void)
void free_initmem(void)
{
free_initmem_default(0);
free_initmem_default(-1);
}
#ifdef CONFIG_BLK_DEV_INITRD
@ -486,7 +486,7 @@ static int keep_initrd;
void free_initrd_mem(unsigned long start, unsigned long end)
{
if (!keep_initrd)
free_reserved_area((void *)start, (void *)end, 0, "initrd");
free_reserved_area((void *)start, (void *)end, -1, "initrd");
}
static int __init keepinitrd_setup(char *__unused)

4
arch/xtensa/mm/init.c
View file

@ -214,11 +214,11 @@ extern int initrd_is_mapped;
void free_initrd_mem(unsigned long start, unsigned long end)
{
if (initrd_is_mapped)
free_reserved_area((void *)start, (void *)end, 0, "initrd");
free_reserved_area((void *)start, (void *)end, -1, "initrd");
}
#endif
void free_initmem(void)
{
free_initmem_default(0);
free_initmem_default(-1);
}

7
include/linux/mm.h
View file

@ -1308,7 +1308,7 @@ extern void free_initmem(void);
/*
* Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK)
* into the buddy system. The freed pages will be poisoned with pattern
* "poison" if it's non-zero.
* "poison" if it's within range [0, UCHAR_MAX].
* Return pages freed into the buddy system.
*/
extern unsigned long free_reserved_area(void *start, void *end,
@ -1348,8 +1348,9 @@ static inline void mark_page_reserved(struct page *page)
/*
* Default method to free all the __init memory into the buddy system.
* The freed pages will be poisoned with pattern "poison" if it is
* non-zero. Return pages freed into the buddy system.
* The freed pages will be poisoned with pattern "poison" if it's within
* range [0, UCHAR_MAX].
* Return pages freed into the buddy system.
*/
static inline unsigned long free_initmem_default(int poison)
{

2
mm/page_alloc.c
View file

@ -5214,7 +5214,7 @@ unsigned long free_reserved_area(void *start, void *end, int poison, char *s)
start = (void *)PAGE_ALIGN((unsigned long)start);
end = (void *)((unsigned long)end & PAGE_MASK);
for (pos = start; pos < end; pos += PAGE_SIZE, pages++) {
if (poison)
if ((unsigned int)poison <= 0xFF)
memset(pos, poison, PAGE_SIZE);
free_reserved_page(virt_to_page(pos));
}