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[POWERPC] spufs: add memory barriers after set_bit

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set_bit does not guarantee ordering on powerpc, so using it
for communication between threads requires explicit
mb() calls.

Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
This commit is contained in:
Arnd Bergmann 2007-04-23 21:08:10 +02:00 committed by Arnd Bergmann
parent e097b51328
commit 390c534304
1 changed files with 3 additions and 0 deletions
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3
arch/powerpc/platforms/cell/spufs/sched.c
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@ -76,6 +76,7 @@ void spu_start_tick(struct spu_context *ctx)
* Make sure the exiting bit is cleared.
*/
clear_bit(SPU_SCHED_EXITING, &ctx->sched_flags);
mb();
queue_delayed_work(spu_sched_wq, &ctx->sched_work, SPU_TIMESLICE);
}
}
@ -88,6 +89,7 @@ void spu_stop_tick(struct spu_context *ctx)
* makes sure it does not rearm itself anymore.
*/
set_bit(SPU_SCHED_EXITING, &ctx->sched_flags);
mb();
cancel_delayed_work(&ctx->sched_work);
}
}
@ -239,6 +241,7 @@ static void spu_add_to_rq(struct spu_context *ctx)
spin_lock(&spu_prio->runq_lock);
list_add_tail(&ctx->rq, &spu_prio->runq[ctx->prio]);
set_bit(ctx->prio, spu_prio->bitmap);
mb();
spin_unlock(&spu_prio->runq_lock);
}