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Message-ID: <20071017184049.GV15552@kernel.dk> Date: Wed, 17 Oct 2007 20:40:49 +0200 From: Jens Axboe <jens.axboe@...cle.com> To: Linus Torvalds <torvalds@...ux-foundation.org> Cc: Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org> Subject: Re: [bug] block subsystem related crash with latest -git On Wed, Oct 17 2007, Linus Torvalds wrote: > > > On Wed, 17 Oct 2007, Linus Torvalds wrote: > > > > So I think your change to use "sg_next()" only when you actually need a > > next pointer is the correct one after all. > > That still leaves the initialization issue. The link pointers need to all > be initialized at SG allocation time (and not just the last one for the > case where it's a linked entry). > > And if you initialize them at allocation time, does an allocation ever get > re-used without being free'd in between (if it does, you do indeed need to > initialize the non-link pointers each time - but I don't see it being the > case, so ..) The links will not change, so reuse should actually be OK. The reuse cannot be larger than the original would hold, but that would be a bug without chaining as well of course. WRT reuse, if we end up requeuing a request, than we will go through the whole thing again. I don't think Ingo is hitting that either, though. -- Jens Axboe - 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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