Re: [RFC 1/1] fs/reiserfs/journal.c: Remove obsolete __GFP_NOFAIL

[Joe Perches <joe@perches.com>]

On Sat, 2014-03-22 at 10:55 -0700, Andrew Morton wrote:
> On Sat, 22 Mar 2014 13:32:07 -0400 tytso@mit.edu wrote:
> 
> > On Sat, Mar 22, 2014 at 01:26:06PM -0400, tytso@MIT.EDU wrote:
> > > > Well.  Converting an existing retry-for-ever caller to GFP_NOFAIL is
> > > > good.  Adding new retry-for-ever code is not good.
> > 
> > Oh, and BTW --- now that checkpatch.pl now flags an warning whenever
> > GFP_NOFAIL is used
> 
> I don't know what the basis for this NOFAIL-is-going-away theory could
> have been.  What's the point in taking a centrally implemented piece of
> logic and splattering its implementation out to tens of different
> callsites?
[]
> diff -puN scripts/checkpatch.pl~scripts-checkpatchpl-__gfp_nofail-isnt-going-away scripts/checkpatch.pl
[]
> @@ -4240,12 +4240,6 @@ sub process {
>  			     "$1 uses number as first arg, sizeof is generally wrong\n" . $herecurr);
>  		}
>  
> -# check for GFP_NOWAIT use
> -		if ($line =~ /\b__GFP_NOFAIL\b/) {
> -			WARN("__GFP_NOFAIL",
> -			     "Use of __GFP_NOFAIL is deprecated, no new users should be added\n" . $herecurr);
> -		}

How about just changing this message to something like:

			WARN("__GFP_NOFAIL",
			     "Use of __GFP_NOFAIL may cause the OOM handler to kill a random process\n" . $herecurr);