linux-kernel - Re: [PATCH] FS-Cache: Add missing initialization of ret in cachefiles_write

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Date:	Thu, 12 Nov 2015 10:42:53 +0000
From:	David Howells <dhowells@...hat.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	dhowells@...hat.com, Al Viro <viro@...iv.linux.org.uk>,
	linux-cachefs@...hat.com,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] FS-Cache: Add missing initialization of ret in cachefiles_write_page()

Geert Uytterhoeven <geert@...ux-m68k.org> wrote:

> > This isn't quite the right solution.  The uninitialised error path needs to
> > set -ENOBUFS.
> 
> That's what your commit 102f4d900c9c8f5e ("FS-Cache: Handle a write to the
> page immediately beyond the EOF marker") does, and is also in its commit
> description:
> 
>     Whilst we're at it, change the triggered assertion in CacheFiles to just
>     return -ENOBUFS instead.
> 
> "ret" is used only to print the original error in a debug message.

I'll adjust your patch to set the default value in ret to be -ENOBUFS instead
of 0.

> > Unfortunately, my compiler doesn't show a warning:-/
> 
> Need old gcc (4.1.2 ;-)

Quite possibly - gcc-5.1 does seem to be a bit lacking in detection of such
things.

David
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