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author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2010-08-24 04:41:48 (GMT) |
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committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2010-08-24 04:41:48 (GMT) |
commit | 529b7307d804f649839b5b65b303442140266d26 (patch) | |
tree | 1fb7edf7770e27d1e596a1d0aa2a64c1b986938d /arch/powerpc/mm | |
parent | b1515af2911c4339ed34865a0594f4ad3392921a (diff) | |
download | linux-fsl-qoriq-529b7307d804f649839b5b65b303442140266d26.tar.xz |
powerpc: Make rwsem use "long" type
This makes the 64-bit kernel use 64-bit signed integers for the counter
(effectively supporting 32-bit of active count in the semaphore), thus
avoiding things like overflow of the mmap_sem if you use a really crazy
number of threads
Note: Ideally the type in the structure should be atomic_long_t rather
than "long". However, there's some nasty issues with that. It needs to
be initialized statically -and- lib/rwsem.c does things like
sem->count = RWSEM_UNLOCKED_VALUE;
Now, if you mix in the fact that atomic_* types are actually structures
with one member and note typedefs of a scalar, it makes its really nasty.
So I stuck to what we did before using a long and casts for now.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/mm')
0 files changed, 0 insertions, 0 deletions