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Message-Id: <20130807142647.6614d3ec88a7af12cba4505a@linux-foundation.org> Date: Wed, 7 Aug 2013 14:26:47 -0700 From: Andrew Morton <akpm@...ux-foundation.org> To: Ed Cashin <ecashin@...aid.com> Cc: <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] aoe: adjust ref of head for compound page tails On Wed, 7 Aug 2013 17:21:32 -0400 Ed Cashin <ecashin@...aid.com> wrote: > > What are the end-user-visible effects of the problem which is being > > fixed? Please always include this info when fixing bugs so that others > > can work out what kernel version(s) need the patch. > > > Sorry. I tried to cover that but maybe should have separated it more clearly from the running text. > > The patch changes the current behavior encountered with direct I/O and aoe: > > aoe can BUG when direct I/O used > > ... to a new behavior: > > aoe does not BUG when direct I/O is used > > And the user will never know that instead aoe is manipulating the _count of the head page, even though that's what's happening with this patch applied. > > (The user-visible effects that motivated the older patch that added the BUG to aoe when page tails are used for block I/O was a VM_BUG_ON that occurred when the aoe driver manipulated the _count of a compound page tail.) OK, I added "Fix a BUG which can trigger when direct-IO is used with AOE". Which kernel versions are affected? -- 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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