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authorVegard Nossum <vegard.nossum@gmail.com>2008-04-04 00:53:23 +0200
committerVegard Nossum <vegard.nossum@gmail.com>2009-06-15 12:40:02 +0200
commitf85612967c93b67b10dd240e3e8bf8a0eee9def7 (patch)
tree184a70bc888b35235ee0b1805a06f90fd45295d8 /arch/x86/mm/init.c
parentkmemcheck: use kmemcheck_pte_lookup() instead of open-coding it (diff)
downloadlinux-f85612967c93b67b10dd240e3e8bf8a0eee9def7.tar.xz
linux-f85612967c93b67b10dd240e3e8bf8a0eee9def7.zip
x86: add hooks for kmemcheck
The hooks that we modify are: - Page fault handler (to handle kmemcheck faults) - Debug exception handler (to hide pages after single-stepping the instruction that caused the page fault) Also redefine memset() to use the optimized version if kmemcheck is enabled. (Thanks to Pekka Enberg for minimizing the impact on the page fault handler.) As kmemcheck doesn't handle MMX/SSE instructions (yet), we also disable the optimized xor code, and rely instead on the generic C implementation in order to avoid false-positive warnings. Signed-off-by: Vegard Nossum <vegardno@ifi.uio.no> [whitespace fixlet] Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi> 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/mm/init.c')
-rw-r--r--arch/x86/mm/init.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index 34c1bfb64f1c..f53b57e4086f 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -213,7 +213,7 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
if (!after_bootmem)
init_gbpages();
-#ifdef CONFIG_DEBUG_PAGEALLOC
+#if defined(CONFIG_DEBUG_PAGEALLOC) || defined(CONFIG_KMEMCHECK)
/*
* For CONFIG_DEBUG_PAGEALLOC, identity mapping will use small pages.
* This will simplify cpa(), which otherwise needs to support splitting