linux-kernel - Re: [RFC 1/1] fs/reiserfs/journal.c: Remove obsolete __GFP

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Date:	Sat, 22 Mar 2014 13:03:22 -0400
From:	tytso@....edu
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Fabian Frederick <fabf@...net.be>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	reiserfs-devel@...r.kernel.org
Subject: Re: [RFC 1/1] fs/reiserfs/journal.c: Remove obsolete  __GFP_NOFAIL

On Fri, Mar 21, 2014 at 01:00:55PM -0700, Andrew Morton wrote:
> 
> The whole point of __GFP_NOFAIL is to centralise this
> wait-for-memory-for-ever operation.  So it is implemented in a common
> (core) place and so that we can easily locate these problematic
> callers.
> 
> is exactly wrong.  Yes, we'd like __GFP_NOFAIL to go away, but it
> cannot go away until buggy callsites such as this one are *fixed*. 
> Removing the __GFP_NOFAIL usage simply hides the buggy code from casual
> searchers.

The change to jbd2 was made in July 2010, back when the "we must
exterminate GFP_NOFAIL at all costs" brigade was in high gear, and the
folks claiming that GFP_FAIL *would* go away, come hell or high water,
was a bit more emphatic.

I'll note that since 2011, there has been precious little movement on
removing the final few callers of GFP_NOFAIL, and we still have a bit
under two dozen of them, including a new one in fs/buffer.c that was
added in 2013.

In any case, __GFP_NOFAIL is in the code comments, so a casual
searcher would find it pretty quickly with a "git grep".

	       	       	      	      	   - Ted
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