s390/spinlock: cleanup spinlock code

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Improve the spinlock code in several aspects:
 - Have _raw_compare_and_swap return true if the operation has been
   successful instead of returning the old value.
 - Remove the "volatile" from arch_spinlock_t and arch_rwlock_t
 - Rename 'owner_cpu' to 'lock'
 - Add helper functions arch_spin_trylock_once / arch_spin_tryrelease_once

[ Martin Schwidefsky: patch breakdown and code beautification ]

Signed-off-by: Philipp Hachtmann <phacht@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

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Philipp Hachtmann 2014-04-07 18:25:23 +02:00 • committed by Martin Schwidefsky

parent 50be634507

commit 5b3f683e69

3 changed files with 82 additions and 77 deletions

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98

arch/s390/include/asm/spinlock.h

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6

arch/s390/include/asm/spinlock_types.h

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63

arch/s390/lib/spinlock.c

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