lkml.org 
[lkml]   [2016]   [Oct]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[tip:locking/core] locking/mutex: Simplify some ww_mutex code in __mutex_lock_common()
Commit-ID:  a40ca56577f628eb3f7af22b484e95edfdd047a2
Gitweb: http://git.kernel.org/tip/a40ca56577f628eb3f7af22b484e95edfdd047a2
Author: Waiman Long <Waiman.Long@hpe.com>
AuthorDate: Fri, 26 Aug 2016 19:35:08 -0400
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 25 Oct 2016 11:31:53 +0200

locking/mutex: Simplify some ww_mutex code in __mutex_lock_common()

This patch removes some of the redundant ww_mutex code in
__mutex_lock_common().

Tested-by: Jason Low <jason.low2@hpe.com>
Signed-off-by: Waiman Long <Waiman.Long@hpe.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Ding Tianhong <dingtianhong@huawei.com>
Cc: Imre Deak <imre.deak@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Paul E. McKenney <paulmck@us.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Will Deacon <Will.Deacon@arm.com>
Link: http://lkml.kernel.org/r/1472254509-27508-1-git-send-email-Waiman.Long@hpe.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
kernel/locking/mutex.c | 13 ++++---------
1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/kernel/locking/mutex.c b/kernel/locking/mutex.c
index 8bb2304..6c0d304 100644
--- a/kernel/locking/mutex.c
+++ b/kernel/locking/mutex.c
@@ -587,10 +587,11 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass,
struct mutex_waiter waiter;
unsigned long flags;
bool first = false;
+ struct ww_mutex *ww;
int ret;

if (use_ww_ctx) {
- struct ww_mutex *ww = container_of(lock, struct ww_mutex, base);
+ ww = container_of(lock, struct ww_mutex, base);
if (unlikely(ww_ctx == READ_ONCE(ww->ctx)))
return -EALREADY;
}
@@ -602,12 +603,8 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass,
mutex_optimistic_spin(lock, ww_ctx, use_ww_ctx)) {
/* got the lock, yay! */
lock_acquired(&lock->dep_map, ip);
- if (use_ww_ctx) {
- struct ww_mutex *ww;
- ww = container_of(lock, struct ww_mutex, base);
-
+ if (use_ww_ctx)
ww_mutex_set_context_fastpath(ww, ww_ctx);
- }
preempt_enable();
return 0;
}
@@ -691,10 +688,8 @@ skip_wait:
/* got the lock - cleanup and rejoice! */
lock_acquired(&lock->dep_map, ip);

- if (use_ww_ctx) {
- struct ww_mutex *ww = container_of(lock, struct ww_mutex, base);
+ if (use_ww_ctx)
ww_mutex_set_context_slowpath(ww, ww_ctx);
- }

spin_unlock_mutex(&lock->wait_lock, flags);
preempt_enable();
\
 
 \ /
  Last update: 2016-10-25 12:30    [W:0.079 / U:2.080 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site