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Message-ID: <20150929215008.GD3578@mtj.duckdns.org> Date: Tue, 29 Sep 2015 17:50:08 -0400 From: Tejun Heo <tj@...nel.org> To: Jens Axboe <axboe@...nel.dk> Cc: Akinobu Mita <akinobu.mita@...il.com>, LKML <linux-kernel@...r.kernel.org>, Ming Lei <tom.leiming@...il.com>, Christoph Hellwig <hch@....de> Subject: Re: [PATCH v4 6/7] blk-mq: fix freeze queue race Hello, On Tue, Sep 29, 2015 at 11:03:46AM -0400, Tejun Heo wrote: > On Tue, Sep 29, 2015 at 09:01:31AM -0600, Jens Axboe wrote: > > I think that would be very useful, it seems sort of half-assed if the caller > > side has to provide serialization for that. > > Yeah, the thing is init/exit are usually caller synchronized but > percpu_rwsem's kill/reinit are more of mode-switching operations which > can be performed concurrently during operation so I think the right > thing to do here is making it synchronize itself. Will spin a patch. Patchset posted http://lkml.kernel.org/g/1443563240-29306-1-git-send-email-tj@kernel.org Unfortunately, the required changes on percpu_ref side ended up somewhat invasive and don't seem fit for -stable backport. I think it'd be a good idea to apply Akinobu's patch for now and then revert it later when the percpu_ref changes hit mainline. Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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