user/sven/linux.git/kernel/locking/mutex.h, branch v4.4.2Linux Kernel
https://git.stealer.net/cgit.cgi/user/sven/linux.git/atom?h=v4.4.22014-08-13T08:32:02Zlocking/mutexes: Use MUTEX_SPIN_ON_OWNER when appropriate2014-08-13T08:32:02ZDavidlohr Buesodavidlohr@hp.com2014-07-30T20:41:54Zurn:sha1:7608a43d8f2e02f8b532f8e11481d7ecf8b5d3f9
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>
locking: Move the mutex code to kernel/locking/2013-11-06T06:55:07ZPeter Zijlstrapeterz@infradead.org2013-10-31T17:11:53Zurn:sha1:01768b42dc97a67b4fb33a2535c49fc1969880df
Suggested-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/n/tip-1ditvncg30dgbpvrz2bxfmke@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>