linux-kernel - Re: [PATCH 2/4] mm/page_alloc: correct return value when failing at preparing

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Date:   Tue, 13 Jul 2021 15:56:23 +0100
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Chuck Lever III <chuck.lever@...cle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Desmond Cheong Zhi Xi <desmondcheongzx@...il.com>,
        Zhang Qiang <Qiang.Zhang@...driver.com>,
        Yanfei Xu <yanfei.xu@...driver.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Matteo Croce <mcroce@...rosoft.com>,
        Linux-MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/4] mm/page_alloc: correct return value when failing at
 preparing

On Tue, Jul 13, 2021 at 02:21:58PM +0000, Chuck Lever III wrote:
> 
> 
> > On Jul 13, 2021, at 9:56 AM, Mel Gorman <mgorman@...hsingularity.net> wrote:
> > 
> > From: Yanfei Xu <yanfei.xu@...driver.com>
> > 
> > If the array passed in is already partially populated, we should
> > return "nr_populated" even failing at preparing arguments stage.
> > 
> > Signed-off-by: Yanfei Xu <yanfei.xu@...driver.com>
> > Signed-off-by: Mel Gorman <mgorman@...hsingularity.net>
> > Link: https://lore.kernel.org/r/20210709102855.55058-1-yanfei.xu@windriver.com
> > ---
> > mm/page_alloc.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> > index 6ef86f338151..803414ce9264 100644
> > --- a/mm/page_alloc.c
> > +++ b/mm/page_alloc.c
> > @@ -5255,7 +5255,7 @@ unsigned long __alloc_pages_bulk(gfp_t gfp, int preferred_nid,
> > 	gfp &= gfp_allowed_mask;
> > 	alloc_gfp = gfp;
> > 	if (!prepare_alloc_pages(gfp, 0, preferred_nid, nodemask, &ac, &alloc_gfp, &alloc_flags))
> > -		return 0;
> > +		return nr_populated;
> 
> Can you restore the hunk in patch 3/4 that changes this "return nr_populated;"
> to "goto out;" ?
> 

I fixed that up in the series I sent out. I applied this patch first
then reconciled the collision with your patch.

-- 
Mel Gorman
SUSE Labs