From: Davidlohr Bueso <davidlohr@hp.com>
Date: Wed, 30 Jul 2014 20:41:53 +0000 (-0700)
Subject: locking/mutexes: Refactor optimistic spinning code
X-Git-Tag: fixes-against-v3.18-rc2~101^2~12
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=76916515d9d84e6552ee5e218e0ed566ad75e600;p=pandora-kernel.git

locking/mutexes: Refactor optimistic spinning code

When we fail to acquire the mutex in the fastpath, we end up calling
__mutex_lock_common(). A *lot* goes on in this function. Move out the
optimistic spinning code into mutex_optimistic_spin() and simplify
the former a bit. Furthermore, this is similar to what we have in
rwsems. No logical changes.

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: mingo@kernel.org
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/1406752916-3341-4-git-send-email-davidlohr@hp.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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