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
..
kmemcheck	Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2010-10-21 13:47:29 -07:00
dump_pagetables.c	x86, mm: Create symbolic index into address_markers array	2010-07-20 16:56:19 -07:00
extable.c	x86, 64-bit: Move K8 B step iret fixup to fault entry asm	2009-10-12 18:29:46 +02:00
fault.c	x86: access_error API cleanup	2010-10-26 16:52:09 -07:00
gup.c	x86, doc: Fix minor spelling error in arch/x86/mm/gup.c	2010-02-02 16:00:44 -08:00
highmem_32.c	mm: fix race in kunmap_atomic()	2010-10-27 18:03:05 -07:00
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	Merge branch 'x86-trampoline-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2010-10-22 20:37:50 -07:00
init_64.c	Merge branch 'core-memblock-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2010-10-21 18:52:11 -07:00
init.c	x86, memblock: Replace e820_/_early string with memblock_	2010-08-27 11:13:47 -07:00
iomap_32.c	mm: fix race in kunmap_atomic()	2010-10-27 18:03:05 -07:00
ioremap.c	xen: Cope with unmapped pages when initializing kernel pagetable	2010-10-13 16:07:13 -07:00
k8topology_64.c	Merge branch 'core-memblock-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2010-10-21 18:52:11 -07:00
kmmio.c	x86, kmmio/mmiotrace: Fix double free of kmmio_fault_pages	2010-06-18 11:30:09 +02:00
Makefile	x86, memblock: Add memblock_x86_find_in_range_size()	2010-08-27 11:08:06 -07:00
memblock.c	x86, memblock: Remove __memblock_x86_find_in_range_size()	2010-10-05 21:45:43 -07:00
memtest.c	x86, memblock: Replace e820_/_early string with memblock_	2010-08-27 11:13:47 -07:00
mmap.c	x86: Use helpers for rlimits	2010-01-27 15:17:31 -08:00
mmio-mod.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
numa_32.c	x86-32, memblock: Make add_highpages honor early reserved ranges	2010-10-05 21:44:35 -07:00
numa_64.c	Merge branch 'core-memblock-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2010-10-21 18:52:11 -07:00
numa.c	x86/mm: Remove unused DBG() macro	2010-05-31 10:01:53 +02:00
pageattr-test.c
pageattr.c	Merge branch 'drm-ttm-pool' into drm-core-next	2010-04-20 13:12:28 +10:00
pat_internal.h	x86, pat: Fix memory leak in free_memtype	2010-05-26 11:26:04 -07:00
pat_rbtree.c	rbtree: Undo augmented trees performance damage and regression	2010-07-05 14:43:50 +02:00
pat.c	Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2010-08-06 10:17:52 -07:00
pf_in.c	x86,mmiotrace: Add support for tracing STOS instruction	2010-08-02 01:32:01 +02:00
pf_in.h
pgtable_32.c	x86: remove last traces of quicklist usage	2010-05-24 13:33:31 -07:00
pgtable.c	Merge branch 'x86-vmware-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2010-10-21 13:53:24 -07:00
physaddr.c	x86: split __phys_addr out into separate file	2009-09-10 11:48:55 -07:00
physaddr.h	x86: split __phys_addr out into separate file	2009-09-10 11:48:55 -07:00
setup_nx.c	x86, mm: Report state of NX protections during boot	2009-11-16 13:44:59 -08:00
srat_32.c	x86, memblock: Replace e820_/_early string with memblock_	2010-08-27 11:13:47 -07:00
srat_64.c	Merge branch 'x86/urgent' into core/memblock	2010-10-11 17:05:11 -07:00
testmmiotrace.c	x86, kmmio/mmiotrace: Fix double free of kmmio_fault_pages	2010-06-18 11:30:09 +02:00
tlb.c	x86: Spread tlb flush vector between nodes	2010-10-20 14:44:42 -07:00