linux-kernel - [PATCH v2 14/17] dma-debug: Mark free_entries

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Date:   Mon, 19 Nov 2018 13:55:23 -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 14/17] dma-debug: Mark free_entries_lock as terminal

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

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

diff --git a/kernel/dma/debug.c b/kernel/dma/debug.c
index 231ca46..f891688 100644
--- a/kernel/dma/debug.c
+++ b/kernel/dma/debug.c
@@ -106,7 +106,7 @@ struct hash_bucket {
 /* List of pre-allocated dma_debug_entry's */
 static LIST_HEAD(free_entries);
 /* Lock for the list above */
-static DEFINE_SPINLOCK(free_entries_lock);
+static DEFINE_TERMINAL_SPINLOCK(free_entries_lock);
 
 /* Global disable flag - will be set in case of an error */
 static bool global_disable __read_mostly;
-- 
1.8.3.1