From: David Howells <dhowells@redhat.com>
To: Misono Tomohiro <misono.tomohiro@jp.fujitsu.com>
Cc: dhowells@redhat.com, Qu Wenruo <wqu@suse.com>,
David Sterba <dsterba@suse.com>,
linux-btrfs@vger.kernel.org
Subject: Re: [PATCH] btrfs: ctree.h: Fix suspicious rcu usage warning in btrfs_debug_in_rcu()
Date: Fri, 24 Aug 2018 13:08:51 +0100 [thread overview]
Message-ID: <24038.1535112531@warthog.procyon.org.uk> (raw)
In-Reply-To: <c79f9ff1-e451-d2b4-a800-738053e47df8@jp.fujitsu.com>
Misono Tomohiro <misono.tomohiro@jp.fujitsu.com> wrote:
> commit 672d599041c8 ("btrfs: Use wrapper macro for rcu string to remove
> duplicate code") replaces some open coded rcu string handling with macro.
>
> It turns out that btrfs_debug_in_rcu() is used for the first time and
> the macro lacks lock/unlock of rcu string for non debug case
> (i.e. when message is not printed), leading suspicious RCU usage warning
> when CONFIG_PROVE_RCU is on.
>
> Fix this by adding a wrapper to call lock/unlock for non debug case too.
>
> Fixes: 672d599041c8 ("btrfs: Use wrapper macro for rcu string to remove
> duplicate code")
> Reported-by: David Howells <dhowells@redhat.com>
> Signed-off-by: Misono Tomohiro <misono.tomohiro@jp.fujitsu.com>
Tested-by: David Howells <dhowells@redhat.com>
prev parent reply other threads:[~2018-08-24 15:43 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-23 15:49 fs/btrfs/volumes.c:6114 suspicious rcu_dereference_check() usage! David Howells
2018-08-23 15:59 ` David Sterba
2018-08-23 16:08 ` David Howells
2018-08-24 2:07 ` Misono Tomohiro
2018-08-24 2:35 ` [PATCH] btrfs: ctree.h: Fix suspicious rcu usage warning in btrfs_debug_in_rcu() Misono Tomohiro
2018-08-24 11:46 ` David Sterba
2018-08-24 12:08 ` David Howells [this message]
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