]> git.karo-electronics.de Git - linux-beck.git/commit
locking/mutexes: Use MUTEX_SPIN_ON_OWNER when appropriate
authorDavidlohr Bueso <davidlohr@hp.com>
Wed, 30 Jul 2014 20:41:54 +0000 (13:41 -0700)
committerIngo Molnar <mingo@kernel.org>
Wed, 13 Aug 2014 08:32:02 +0000 (10:32 +0200)
commit7608a43d8f2e02f8b532f8e11481d7ecf8b5d3f9
tree8701cd9c38afe75bbb39ea00cd15a364837d8ff9
parent76916515d9d84e6552ee5e218e0ed566ad75e600
locking/mutexes: Use MUTEX_SPIN_ON_OWNER when appropriate

4badad35 ("locking/mutex: Disable optimistic spinning on some
architectures") added a ARCH_SUPPORTS_ATOMIC_RMW flag to
disable the mutex optimistic feature on specific archs.

Because CONFIG_MUTEX_SPIN_ON_OWNER only depended on DEBUG and
SMP, it was ok to have the ->owner field conditional a bit
flexible. However by adding a new variable to the matter,
we can waste space with the unused field, ie: CONFIG_SMP &&
(!CONFIG_MUTEX_SPIN_ON_OWNER && !CONFIG_DEBUG_MUTEX).

Signed-off-by: Davidlohr Bueso <davidlohr@hp.com>
Acked-by: Jason Low <jason.low2@hp.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: aswin@hp.com
Cc: Davidlohr Bueso <davidlohr@hp.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Jason Low <jason.low2@hp.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Link: http://lkml.kernel.org/r/1406752916-3341-5-git-send-email-davidlohr@hp.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
include/linux/mutex.h
kernel/locking/mutex.h