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Date: Wed, 15 Apr 2020 13:20:19 +0000 From: Luis Chamberlain <mcgrof@...nel.org> To: Christoph Hellwig <hch@...radead.org> Cc: axboe@...nel.dk, viro@...iv.linux.org.uk, bvanassche@....org, gregkh@...uxfoundation.org, rostedt@...dmis.org, mingo@...hat.com, jack@...e.cz, ming.lei@...hat.com, nstange@...e.de, akpm@...ux-foundation.org, mhocko@...e.com, yukuai3@...wei.com, linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org, Omar Sandoval <osandov@...com>, Hannes Reinecke <hare@...e.com>, Michal Hocko <mhocko@...nel.org> Subject: Re: [PATCH 5/5] block: revert back to synchronous request_queue removal On Tue, Apr 14, 2020 at 11:46:44PM -0700, Christoph Hellwig wrote: > On Tue, Apr 14, 2020 at 08:58:52PM +0000, Luis Chamberlain wrote: > > > I think this needs a WARN_ON thrown in to enforece the calling context. > > > > I considered adding a might_sleep() but upon review with Bart, he noted > > that this function already has a mutex_lock(), and if you look under the > > hood of mutex_lock(), it has a might_sleep() at the very top. The > > warning then is implicit. > > It might just be a personal preference, but I think the documentation > value of a WARN_ON_ONCE or might_sleep with a comment at the top of > the function is much higher than a blurb in a long kerneldoc text and > a later mutex_lock. Well I'm a fan of making this explicit, so sure will just sprinkle a might_sleep(), even though we have a mutex_lock(). Luis
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