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
..
elf.c
extable.c
fault.c	arch/tile: parameterize system PLs to support KVM port	2010-10-15 15:38:09 -04:00
highmem.c	mm: fix race in kunmap_atomic()	2010-10-27 18:03:05 -07:00
homecache.c	arch/tile: add Tilera's <arch/sim.h> header as an open-source header	2010-10-15 15:36:54 -04:00
hugetlbpage.c
init.c	arch/tile: parameterize system PLs to support KVM port	2010-10-15 15:38:09 -04:00
Makefile
migrate_32.S
migrate.h
mmap.c
pgtable.c	arch: tile: mm: pgtable.c: Removed duplicated #include	2010-08-13 08:10:24 -04:00