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| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2013-06-20 14:30:23 +0530 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-06-21 16:01:56 +1000 |
| commit | 7888b4ddb44dccd68bc20d0dc4425707dff88c72 (patch) | |
| tree | 7d9b5d74f6f51255fe06649511bf39d1a0516356 /arch/powerpc/mm/hugepage-hash64.c | |
| parent | 0ac52dd7666d5c0d0147d73a8e4b1d1ffd81cdf3 (diff) | |
| download | blackbird-op-linux-7888b4ddb44dccd68bc20d0dc4425707dff88c72.tar.gz blackbird-op-linux-7888b4ddb44dccd68bc20d0dc4425707dff88c72.zip | |
powerpc: Prevent gcc to re-read the pagetables
GCC is very likely to read the pagetables just once and cache them in
the local stack or in a register, but it is can also decide to re-read
the pagetables. The problem is that the pagetable in those places can
change from under gcc.
With THP/hugetlbfs the pmd (and pgd for hugetlbfs giga pages) can
change under gup_fast. The pages won't be freed untill we finish
gup fast because we have irq disabled and we free these pages via
rcu callback.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/mm/hugepage-hash64.c')
0 files changed, 0 insertions, 0 deletions
