linux-kernel - [PATCH v2 05/17] printk: Mark logbuf_lock & console_owner

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Message-Id: <1542653726-5655-6-git-send-email-longman@redhat.com>
Date:   Mon, 19 Nov 2018 13:55:14 -0500
From:   Waiman Long <longman@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Will Deacon <will.deacon@....com>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     linux-kernel@...r.kernel.org, kasan-dev@...glegroups.com,
        linux-mm@...ck.org, iommu@...ts.linux-foundation.org,
        Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Tejun Heo <tj@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Waiman Long <longman@...hat.com>
Subject: [PATCH v2 05/17] printk: Mark logbuf_lock & console_owner_lock as terminal locks

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 <longman@...hat.com>
---
 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