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authorVegard Nossum <vegard.nossum@gmail.com>2008-04-04 00:51:41 +0200
committerVegard Nossum <vegard.nossum@gmail.com>2009-06-13 15:37:30 +0200
commitdfec072ecd35ba6ecad2d51dde325253ac9a2936 (patch)
treeccf682a631ef8edc0675d68d004bc3a80b34b648 /arch/x86/include/asm/pgtable.h
parentkmemcheck: add the kmemcheck documentation (diff)
downloadlinux-dfec072ecd35ba6ecad2d51dde325253ac9a2936.tar.xz
linux-dfec072ecd35ba6ecad2d51dde325253ac9a2936.zip
kmemcheck: add the kmemcheck core
General description: kmemcheck is a patch to the linux kernel that detects use of uninitialized memory. It does this by trapping every read and write to memory that was allocated dynamically (e.g. using kmalloc()). If a memory address is read that has not previously been written to, a message is printed to the kernel log. Thanks to Andi Kleen for the set_memory_4k() solution. Andrew Morton suggested documenting the shadow member of struct page. Signed-off-by: Vegard Nossum <vegardno@ifi.uio.no> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi> [export kmemcheck_mark_initialized] [build fix for setup_max_cpus] Signed-off-by: Ingo Molnar <mingo@elte.hu> [rebased for mainline inclusion] Signed-off-by: Vegard Nossum <vegardno@ifi.uio.no>
Diffstat (limited to 'arch/x86/include/asm/pgtable.h')
-rw-r--r--arch/x86/include/asm/pgtable.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 18ef7ebf2631..c5a08079ad5e 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -317,6 +317,15 @@ static inline int pte_present(pte_t a)
return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
}
+static inline int pte_hidden(pte_t x)
+{
+#ifdef CONFIG_KMEMCHECK
+ return pte_flags(x) & _PAGE_HIDDEN;
+#else
+ return 0;
+#endif
+}
+
static inline int pmd_present(pmd_t pmd)
{
return pmd_flags(pmd) & _PAGE_PRESENT;