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[PATCH] s390: atomic primitives

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Hugh Dickins <hugh@veritas.com>

Fix the broken atomic_cmpxchg primitive.  Add atomic_sub_and_test,
atomic64_sub_return, atomic64_sub_and_test, atomic64_cmpxchg,
atomic64_add_unless and atomic64_inc_not_zero.  Replace old style
atomic_compare_and_swap by atomic_cmpxchg.  Shorten the whole header by
defining most primitives with the two inline functions atomic_add_return and
atomic_sub_return.

In addition this patch contains the s390 related fixes of Hugh's "mm: fill
arch atomic64 gaps" patch.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Martin Schwidefsky
2006-01-06 00:19:07 -08:00
committed by Linus Torvalds
parent 8d93c700a4
commit 973bd99375
10 changed files with 97 additions and 132 deletions
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2
drivers/s390/char/tape_block.c
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@@ -65,7 +65,7 @@ static void
tapeblock_trigger_requeue(struct tape_device *device)
{
/* Protect against rescheduling. */
if (atomic_compare_and_swap(0, 1, &device->blk_data.requeue_scheduled))
if (atomic_cmpxchg(&device->blk_data.requeue_scheduled, 0, 1) != 0)
return;
schedule_work(&device->blk_data.requeue_task);
}