linux-kernel - [PATCH] splice : two smp

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Message-id: <4546FA81.1020804@cosmosbay.com>
Date:	Tue, 31 Oct 2006 08:25:53 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Andrew Morton <akpm@...l.org>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>, Jens Axboe <jens.axboe@...cle.com>
Subject: [PATCH] splice : two smp_mb() can be omitted

This patch deletes two calls to smp_mb() that were done after mutex_unlock() 
that contains an implicit memory barrier.

The first one in splice_to_pipe(), where 'do_wakeup' is set to true only if 
pipe->inode is set (and in this case the
if (pipe->inode)
    mutex_unlock(&pipe->inode->i_mutex);
is done too)

The second one in link_pipe(), following inode_double_unlock() that contains 
calls to mutex_unlock() too.

Signed-off-by: Eric Dumazet <dada1@...mosbay.com>

View attachment "splice.patch" of type "text/plain" (611 bytes)