From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matthew Wilcox Date: Sun, 03 Aug 2008 01:32:00 +0000 Subject: Re: [patch] IA64: suppress return value of down_trylock() in salinfo_work_to_do() Message-Id: <20080803013159.GB26461@parisc-linux.org> List-Id: References: <20080803000654.GA30659@verge.net.au> In-Reply-To: <20080803000654.GA30659@verge.net.au> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Simon Horman Cc: linux-ia64@vger.kernel.org, linux-kernel@vger.kernel.org, Tony Luck , Keith Owens On Sun, Aug 03, 2008 at 10:06:58AM +1000, Simon Horman wrote: > salinfo_work_to_do() intentionally ignores the return value of > down_trylock() and calls up() regardless of if the lock > was taken or not. > > This patch suppresses the warning generated by ignoring > this return value - down_trylock() is annotated with __must_check. I can't say that I think this is a good idea. Has anyone looked at what it would take to actually track this? For example, could we ever have the situation where: task A acquires sem task B tries to acquire the sem, fails task B releases the sem that it didn't acquire task A releases the sem, falls down, goes boom? (of course, this is a semaphores, not a mutex, so it'll now be a counting semaphore with n=2, not protecting a damn thing). -- Intel are signing my paycheques ... these opinions are still mine "Bill, look, we understand that you're interested in selling us this operating system, but compare it to ours. We can't possibly take such a retrograde step."