linux-kernel - [RFC PATCH 12/12] mm/kasan: Make quarantine

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Message-Id: <1541709268-3766-13-git-send-email-longman@redhat.com>
Date:   Thu,  8 Nov 2018 15:34:28 -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 12/12] mm/kasan: Make quarantine_lock a terminal lock

By making quarantine_lock a terminal spinlock, it reduces the lockdep
overhead when this lock is being used.

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

diff --git a/mm/kasan/quarantine.c b/mm/kasan/quarantine.c
index b209dba..c9d36ab 100644
--- a/mm/kasan/quarantine.c
+++ b/mm/kasan/quarantine.c
@@ -103,7 +103,7 @@ static void qlist_move_all(struct qlist_head *from, struct qlist_head *to)
 static int quarantine_tail;
 /* Total size of all objects in global_quarantine across all batches. */
 static unsigned long quarantine_size;
-static DEFINE_RAW_SPINLOCK(quarantine_lock);
+static DEFINE_RAW_TERMINAL_SPINLOCK(quarantine_lock);
 DEFINE_STATIC_SRCU(remove_cache_srcu);
 
 /* Maximum size of the global queue. */
-- 
1.8.3.1