From: Andi Kleen <andi@firstfloor.org>
To: linux-kernel@vger.kernel.org
Subject: Tree sweep for spin_is_locked misuses and start warning about it
Date: Fri, 16 Mar 2012 12:00:53 -0700 [thread overview]
Message-ID: <1331924464-18023-1-git-send-email-andi@firstfloor.org> (raw)
I did a tree sweep for spin_is_locked() users and many of them were
wrong, got UP incorrect, were obviously racy and had other problems.
I replaced a lot of users with calls to the correct lock debugging functions,
like lockdep_assert_held()
Generally I think spin_is_locked() should be deprecated because it
is rarely used correctly. There are a few legitimate users so we cannot
outright remove it unfortunately.
But most users can be removed or changed.
After this start warning in checkpatch.pl for spin_is_locked() because
it's rarely wrong. Also error out there for the broken
(WARN|BUG)_ON(!spin_is_locked()) which does not work on UP builds.
-Andi
next reply other threads:[~2012-03-16 19:01 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-16 19:00 Andi Kleen [this message]
2012-03-16 19:00 ` [PATCH 01/11] block: use lockdep_assert_held for queue locking Andi Kleen
2012-03-16 19:00 ` [PATCH 02/11] sgi-xp: Use lockdep_assert_held Andi Kleen
2012-03-16 19:11 ` Robin Holt
2012-03-16 19:00 ` [PATCH 03/11] ada152x: Remove broken usage of spin_is_locked Andi Kleen
2012-03-16 19:00 ` [PATCH 04/11] staging/zmem: Use lockdep_assert_held instead " Andi Kleen
2012-03-16 19:00 ` [PATCH 05/11] XFS: Fix lock ASSERT on UP Andi Kleen
2012-03-19 22:47 ` Dave Chinner
2012-03-20 2:28 ` Andi Kleen
2012-03-21 0:44 ` Dave Chinner
2012-03-16 19:00 ` [PATCH 06/11] huge-memory: Use lockdep_assert_held Andi Kleen
2012-03-16 19:44 ` Andrea Arcangeli
2012-03-16 21:18 ` Hugh Dickins
2012-03-16 19:01 ` [PATCH 07/11] futex: Use lockdep_assert_held() for lock checking Andi Kleen
2012-03-16 19:01 ` [PATCH 08/11] irda: remove spin_is_locked Andi Kleen
2012-03-16 19:01 ` [PATCH 09/11] usb: gadget: f_fs: Remove lock is held before freeing checks Andi Kleen
2012-03-16 19:01 ` [PATCH 10/11] smsc911x: Use lockdep_assert_held instead of home grown buggy construct Andi Kleen
2012-03-16 19:01 ` [PATCH 11/11] checkpatch: Check for spin_is_locked Andi Kleen
2012-03-16 19:22 ` Joe Perches
2012-03-16 20:14 ` Andi Kleen
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