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kmemcheck: add hooks for the page allocator

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This adds support for tracking the initializedness of memory that
was allocated with the page allocator. Highmem requests are not
tracked.

Cc: Dave Hansen <dave@linux.vnet.ibm.com>
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>

[build fix for !CONFIG_KMEMCHECK]
Signed-off-by: Ingo Molnar <mingo@elte.hu>

[rebased for mainline inclusion]
Signed-off-by: Vegard Nossum <vegard.nossum@gmail.com>
This commit is contained in:
Vegard Nossum
2008-11-25 16:55:53 +01:00
parent 9b5cab3189
commit b1eeab6768
8 changed files with 122 additions and 31 deletions
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18
mm/page_alloc.c
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@ -23,6 +23,7 @@
#include <linux/bootmem.h>
#include <linux/compiler.h>
#include <linux/kernel.h>
#include <linux/kmemcheck.h>
#include <linux/module.h>
#include <linux/suspend.h>
#include <linux/pagevec.h>
@ -546,6 +547,8 @@ static void __free_pages_ok(struct page *page, unsigned int order)
int i;
int bad = 0;
kmemcheck_free_shadow(page, order);
for (i = 0 ; i < (1 << order) ; ++i)
bad += free_pages_check(page + i);
if (bad)
@ -994,6 +997,8 @@ static void free_hot_cold_page(struct page *page, int cold)
struct per_cpu_pages *pcp;
unsigned long flags;
kmemcheck_free_shadow(page, 0);
if (PageAnon(page))
page->mapping = NULL;
if (free_pages_check(page))
@ -1047,6 +1052,16 @@ void split_page(struct page *page, unsigned int order)
VM_BUG_ON(PageCompound(page));
VM_BUG_ON(!page_count(page));
#ifdef CONFIG_KMEMCHECK
/*
* Split shadow pages too, because free(page[0]) would
* otherwise free the whole shadow.
*/
if (kmemcheck_page_is_tracked(page))
split_page(virt_to_page(page[0].shadow), order);
#endif
for (i = 1; i < (1 << order); i++)
set_page_refcounted(page + i);
}
@ -1667,7 +1682,10 @@ nopage:
dump_stack();
show_mem();
}
return page;
got_pg:
if (kmemcheck_enabled)
kmemcheck_pagealloc_alloc(page, order, gfp_mask);
return page;
}
EXPORT_SYMBOL(__alloc_pages_internal);