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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>		14 years ago
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Makefile	sparc,leon: Introduce the sparc-leon CPU type.	16 years ago
btfixup.c	sparc: remove CONFIG_SUN4	17 years ago
extable.c	module: trim exception table on init free.	16 years ago
fault_32.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-next-2.6	15 years ago
fault_64.c	sparc: Support show_unhandled_signals.	15 years ago
generic_32.c	sparc: move EXPORT_SYMBOL to the symbols definition	16 years ago
generic_64.c	sparc64: move EXPORT_SYMBOL to the symbols definition	16 years ago
highmem.c	mm: fix race in kunmap_atomic()	14 years ago
hugetlbpage.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	15 years ago
hypersparc.S	sparc: remove CVS keywords	17 years ago
init_32.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	15 years ago
init_64.c	Merge branch 'next-devicetree' of git://git.secretlab.ca/git/linux-2.6	15 years ago
init_64.h	sparc64: Fix definition of VMEMMAP_SIZE.	15 years ago
io-unit.c	sparc: remove references to of_device and to_of_device	15 years ago
iommu.c	Merge branch 'next-devicetree' of git://git.secretlab.ca/git/linux-2.6	15 years ago
leon_mm.c	sparc,leon: CONFIG_SPARC_LEON option and leon specific files.	16 years ago
loadmmu.c	sparc,leon: Introduce the sparc-leon CPU type.	16 years ago
nosun4c.c	MM: Pass a PTE pointer to update_mmu_cache() rather than the PTE itself	15 years ago
srmmu.c	of/sparc: convert various prom_* functions to use phandle	15 years ago
sun4c.c	of/sparc: convert various prom_* functions to use phandle	15 years ago
swift.S	sparc: remove CVS keywords	17 years ago
tlb.c	sparc,sparc64: unify mm/	16 years ago
tsb.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	15 years ago
tsunami.S	sparc/mm/: possible cleanups	17 years ago
ultra.S	sparc64: Reschedule KGDB capture to a software interrupt.	16 years ago
viking.S	sparc: remove CVS keywords	17 years ago