linux-kernel - [PATCH] Lockdep treats down_write_trylock like regular down

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Message-ID: <461A0DDC.5060709@sw.ru>
Date:	Mon, 09 Apr 2007 13:56:44 +0400
From:	Pavel Emelianov <xemul@...ru>
To:	Andrew Morton <akpm@...l.org>
CC:	Ingo Molnar <mingo@...hat.com>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH] Lockdep treats down_write_trylock like regular down_write

This causes constructions like

down_write(&mm1->mmap_sem);
if (down_write_trylock(&mm2->mmap_sem)) {
       ...
       up_write(&mm2->mmap_sem);
}
up_write(&mm1->mmap_sem);

generate a lockdep warning about circular locking dependence.

Call rwsem_acquire() with trylock set to 1.

View attachment "diff-lockdep-rwsem-trylock" of type "text/plain" (357 bytes)