linux-kernel - [RFC PATCH 09/12] lib/stackdepot: Make depot

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Message-Id: <1541709268-3766-10-git-send-email-longman@redhat.com>
Date:   Thu,  8 Nov 2018 15:34:25 -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, 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: [RFC PATCH 09/12] lib/stackdepot: Make depot_lock a terminal spinlock

By defining depot_lock as a terminal spinlock, it reduces the
lockdep overhead when this lock is being used.

Signed-off-by: Waiman Long <longman@...hat.com>
---
 lib/stackdepot.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/stackdepot.c b/lib/stackdepot.c
index e513459..fb17888 100644
--- a/lib/stackdepot.c
+++ b/lib/stackdepot.c
@@ -78,7 +78,7 @@ struct stack_record {
 static int depot_index;
 static int next_slab_inited;
 static size_t depot_offset;
-static DEFINE_SPINLOCK(depot_lock);
+static DEFINE_TERMINAL_SPINLOCK(depot_lock);
 
 static bool init_stack_slab(void **prealloc)
 {
-- 
1.8.3.1