[POWERPC] spufs: streamline locking for isolated spu setup

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For quite a while now spu state is protected by a simple mutex instead
of the old rw_semaphore, and this means we can simplify the locking
around spu_setup_isolated a lot.

Instead of doing an spu_release before entering spu_setup_isolated and
then calling the complicated spu_acquire_exclusive we can now simply
enter the function locked an in guaranteed runnable state, so that the
only bit of spu_acquire_exclusive that's left is the call to
spu_unmap_mappings.

Similarly there's no more need to unlock and reacquire the state_mutex
when spu_setup_isolated is done, but we can always return with the
lock held and only drop it in spu_run_init in the failure case.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>

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This commit is contained in:

Christoph Hellwig 2007-04-23 21:08:12 +02:00 • committed by Arnd Bergmann

parent a475c2f435

commit 7ec18ab923

3 changed files with 16 additions and 55 deletions

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40

arch/powerpc/platforms/cell/spufs/context.c

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30

arch/powerpc/platforms/cell/spufs/run.c

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1

arch/powerpc/platforms/cell/spufs/spufs.h

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