From: Waiman Long Subject: [PATCH v2 05/17] printk: Mark logbuf_lock & console_owner_lock as terminal locks Date: Mon, 19 Nov 2018 13:55:14 -0500 Message-ID: <1542653726-5655-6-git-send-email-longman@redhat.com> References: <1542653726-5655-1-git-send-email-longman@redhat.com> Return-path: In-Reply-To: <1542653726-5655-1-git-send-email-longman@redhat.com> Sender: linux-kernel-owner@vger.kernel.org To: Peter Zijlstra , Ingo Molnar , Will Deacon , Thomas Gleixner Cc: linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, linux-mm@kvack.org, iommu@lists.linux-foundation.org, Petr Mladek , Sergey Senozhatsky , Andrey Ryabinin , Tejun Heo , Andrew Morton , Waiman Long List-Id: iommu@lists.linux-foundation.org By marking logbuf_lock and console_owner_lock as terminal locks, it reduces the performance overhead when those locks are used with lockdep enabled. Signed-off-by: Waiman Long --- kernel/printk/printk.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index 1b2a029..bdbbe31 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -367,7 +367,7 @@ __packed __aligned(4) * within the scheduler's rq lock. It must be released before calling * console_unlock() or anything else that might wake up a process. */ -DEFINE_RAW_SPINLOCK(logbuf_lock); +DEFINE_RAW_TERMINAL_SPINLOCK(logbuf_lock); /* * Helper macros to lock/unlock logbuf_lock and switch between @@ -1568,7 +1568,7 @@ int do_syslog(int type, char __user *buf, int len, int source) }; #endif -static DEFINE_RAW_SPINLOCK(console_owner_lock); +static DEFINE_RAW_TERMINAL_SPINLOCK(console_owner_lock); static struct task_struct *console_owner; static bool console_waiter; -- 1.8.3.1