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Commit a1f22f47 authored by Kyle Yan's avatar Kyle Yan Committed by Gerrit - the friendly Code Review server
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Merge "mm: slub: Panic instead of restoring corrupted bytes" into msm-4.9

parents e6826f07 5e0d9a2f

Documentation/vm/slub.txt

+4 −0
Original line number Diff line number Diff line
@@ -252,6 +252,10 @@ After reporting the details of the issue encountered the FIX SLUB message 
tells us that SLUB has restored the Redzone to its proper value and then

system operations continue.



If it is required to only report the details of the issue and panic immediately

after in order to possibly catch any scribblers one can set the

CONFIG_DEBUG_SLUB_PANIC_ON option.



Emergency operations:

---------------------

mm/slub.c

+4 −0
Original line number Diff line number Diff line
@@ -703,8 +703,12 @@ static void init_object(struct kmem_cache *s, void *object, u8 val) 
static void restore_bytes(struct kmem_cache *s, char *message, u8 data,

						void *from, void *to)

{

#ifdef CONFIG_SLUB_DEBUG_PANIC_ON

	panic("Found corruption 0x%p-0x%p=0x%x\n", from, to - 1, data);

#else

	slab_fix(s, "Restoring 0x%p-0x%p=0x%x\n", from, to - 1, data);

	memset(from, data, to - from);

#endif

}



static int check_bytes_and_report(struct kmem_cache *s, struct page *page,