diff options
author | Vegard Nossum <vegard.nossum@gmail.com> | 2008-04-04 00:51:41 +0200 |
---|---|---|
committer | Vegard Nossum <vegard.nossum@gmail.com> | 2009-06-13 15:37:30 +0200 |
commit | dfec072ecd35ba6ecad2d51dde325253ac9a2936 (patch) | |
tree | ccf682a631ef8edc0675d68d004bc3a80b34b648 /arch/x86/include/asm/pgtable.h | |
parent | kmemcheck: add the kmemcheck documentation (diff) | |
download | linux-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.h | 9 |
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; |