Peter Zijlstra 20273941f2 mm: fix race in kunmap_atomic() ... Christoph reported a nice splat which illustrated a race in the new stack based kmap_atomic implementation. The problem is that we pop our stack slot before we're completely done resetting its state -- in particular clearing the PTE (sometimes that's CONFIG_DEBUG_HIGHMEM). If an interrupt happens before we actually clear the PTE used for the last slot, that interrupt can reuse the slot in a dirty state, which triggers a BUG in kmap_atomic(). Fix this by introducing kmap_atomic_idx() which reports the current slot index without actually releasing it and use that to find the PTE and delay the _pop() until after we're completely done. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Reported-by: Christoph Hellwig <hch@infradead.org> Acked-by: Rik van Riel <riel@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2010-10-27 18:03:05 -07:00
..
40x_mmu.c	memblock: Remove rmo_size, burry it in arch/powerpc where it belongs	2010-08-05 12:56:08 +10:00
44x_mmu.c	memblock: Remove rmo_size, burry it in arch/powerpc where it belongs	2010-08-05 12:56:08 +10:00
dma-noncoherent.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
fault.c	powerpc: Check end of stack canary at oops time	2010-09-02 14:07:30 +10:00
fsl_booke_mmu.c	Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc	2010-10-21 21:19:54 -07:00
gup.c	powerpc/mm: Allow more flexible layouts for hugepage pagetables	2009-10-30 17:20:58 +11:00
hash_low_32.S	powerpc: Use names rather than numbers for SPRGs (v2)	2009-08-20 10:12:27 +10:00
hash_low_64.S	powerpc/mm: Move around testing of _PAGE_PRESENT in hash code	2010-07-23 08:53:23 +10:00
hash_native_64.c	powerpc: Convert native_tlbie_lock to raw_spinlock	2010-02-19 14:52:30 +11:00
hash_utils_64.c	memblock: Remove rmo_size, burry it in arch/powerpc where it belongs	2010-08-05 12:56:08 +10:00
highmem.c	mm: fix race in kunmap_atomic()	2010-10-27 18:03:05 -07:00
hugetlbpage-hash64.c	powerpc/mm: Add some debug output when hash insertion fails	2010-07-23 12:56:56 +10:00
hugetlbpage.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
init_32.c	memblock: Remove rmo_size, burry it in arch/powerpc where it belongs	2010-08-05 12:56:08 +10:00
init_64.c	Merge commit 'v2.6.36-rc3' into x86/memblock	2010-08-31 09:45:46 +02:00
Makefile	powerpc/fsl-booke64: Use TLB CAMs to cover linear mapping on FSL 64-bit chips	2010-10-14 00:55:14 -05:00
mem.c	memblock, bootmem: Round pfn properly for memory and reserved regions	2010-10-12 15:37:51 -07:00
mmap_64.c	powerpc: Use helpers for rlimits	2010-01-15 13:20:08 +11:00
mmu_context_hash32.c	PPC: Split context init/destroy functions	2010-05-17 12:18:20 +03:00
mmu_context_hash64.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
mmu_context_nohash.c	powerpc/mm: Assume first cpu is boot_cpuid not 0	2010-09-02 14:07:34 +10:00
mmu_decl.h	powerpc/fsl-booke64: Use TLB CAMs to cover linear mapping on FSL 64-bit chips	2010-10-14 00:55:14 -05:00
numa.c	memblock, bootmem: Round pfn properly for memory and reserved regions	2010-10-12 15:37:51 -07:00
pgtable_32.c	lmb: rename to memblock	2010-07-14 17:14:00 +10:00
pgtable_64.c	lmb: rename to memblock	2010-07-14 17:14:00 +10:00
pgtable.c	powerpc: Remove all rcu head initializations	2010-07-09 11:28:34 +10:00
ppc_mmu_32.c	memblock: Remove rmo_size, burry it in arch/powerpc where it belongs	2010-08-05 12:56:08 +10:00
slb_low.S	powerpc/mm: Fix hang accessing top of vmalloc space	2009-10-14 16:58:36 +11:00
slb.c	powerpc/pseries: Fix to handle slb resize across migration	2009-09-02 16:19:01 +10:00
slice.c	powerpc: is_hugepage_only_range() must account for both 4kB and 64kB slices	2009-01-16 16:15:16 +11:00
stab.c	lmb: rename to memblock	2010-07-14 17:14:00 +10:00
subpage-prot.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
tlb_hash32.c	powerpc: Removing dead CONFIG_SMP_750	2010-07-09 11:28:38 +10:00
tlb_hash64.c	powerpc: Fix address masking bug in hpte_need_flush()	2010-02-10 13:58:06 +11:00
tlb_low_64e.S	fix comment typo leve -> level in powerpc	2010-02-05 12:22:38 +01:00
tlb_nohash_low.S	powerpc/fsl-booke64: Use TLB CAMs to cover linear mapping on FSL 64-bit chips	2010-10-14 00:55:14 -05:00
tlb_nohash.c	Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc	2010-10-21 21:19:54 -07:00