Re: [patch 4/6] jbd: remove dependency on __GFP_NOFAIL

[David Rientjes]

On Mon, 23 Aug 2010, Andrew Morton wrote:

> > So do
> > you think that we should keep __GFP_NOFAIL as long as all callers are not
> > able to handle allocation failures in more reasonable way?
> 
> The concept should be encapsulated in _some_ centralised fashion.
> 
> Helper functions would work as well as __GFP_NOFAIL, and will move any
> runtime cost away from the good code and push it onto the bad code.
> 

There's no runtime cost on the bad code, the calls never loop since the 
page allocator already loops itself.  Regardless, I'll add a helper 
function to include/linux/gfp.h to do this with a WARN_ON_ONCE() inside 
the loop in case any order > PAGE_ALLOC_COSTLY_ORDER callers are ever 
added (and I really hope nobody merges those).
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