kmemcheck: add hooks for the page allocator

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>

1 files changed, 8 insertions, 0 deletions

diff --git a/arch/x86/mm/kmemcheck/shadow.c b/arch/x86/mm/kmemcheck/shadow.c
index e7346d3873b3..e773b6bd0079 100644
--- a/arch/x86/mm/kmemcheck/shadow.c
+++ b/arch/x86/mm/kmemcheck/shadow.c
@@ -116,6 +116,14 @@ void kmemcheck_mark_uninitialized_pages(struct page *p, unsigned int n)
                 kmemcheck_mark_uninitialized(page_address(&p[i]), PAGE_SIZE);
 }
 
+void kmemcheck_mark_initialized_pages(struct page *p, unsigned int n)
+{
+        unsigned int i;
+
+        for (i = 0; i < n; ++i)
+                kmemcheck_mark_initialized(page_address(&p[i]), PAGE_SIZE);
+}
+
 enum kmemcheck_shadow kmemcheck_shadow_test(void *shadow, unsigned int size)
 {
         uint8_t *x;