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| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2014-03-15 16:17:58 +0530 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2014-03-24 09:48:34 +1100 |
| commit | 346519a1606e196bd5f11b9f5eacaf60f70477a1 (patch) | |
| tree | 97b5861188bb1dd0cdb79efcd0866228aa75fb2f /ipc/syscall.c | |
| parent | ee4ed6fa5af0009a1205498d1f754fecc7af7657 (diff) | |
| download | linux-346519a1606e196bd5f11b9f5eacaf60f70477a1.tar.gz linux-346519a1606e196bd5f11b9f5eacaf60f70477a1.tar.bz2 linux-346519a1606e196bd5f11b9f5eacaf60f70477a1.zip | |
powerpc/mm: Make sure a local_irq_disable prevent a parallel THP split
We have generic code like the one in get_futex_key that assume that
a local_irq_disable prevents a parallel THP split. Support that by
adding a dummy smp call function after setting _PAGE_SPLITTING. Code
paths like get_user_pages_fast still need to check for _PAGE_SPLITTING
after disabling IRQ which indicate that a parallel THP splitting is
ongoing. Now if they don't find _PAGE_SPLITTING set, then we can be
sure that parallel split will now block in pmdp_splitting flush
until we enables IRQ
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Acked-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'ipc/syscall.c')
0 files changed, 0 insertions, 0 deletions