linux-kernel - Re: [PATCH 2/3] mm/mempolicy: Avoid the fallthrough with MPOLD_BIND in mpol

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Date: Mon, 19 Feb 2024 13:02:09 +0100
From: Michal Hocko <mhocko@...e.com>
To: Donet Tom <donettom@...ux.ibm.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Aneesh Kumar <aneesh.kumar@...nel.org>,
	Huang Ying <ying.huang@...el.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Mel Gorman <mgorman@...e.de>, Ben Widawsky <ben.widawsky@...el.com>,
	Feng Tang <feng.tang@...el.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>, Rik van Riel <riel@...riel.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Matthew Wilcox <willy@...radead.org>,
	Mike Kravetz <mike.kravetz@...cle.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Dan Williams <dan.j.williams@...el.com>,
	Hugh Dickins <hughd@...gle.com>,
	Kefeng Wang <wangkefeng.wang@...wei.com>,
	Suren Baghdasaryan <surenb@...gle.com>
Subject: Re: [PATCH 2/3] mm/mempolicy: Avoid the fallthrough with MPOLD_BIND
 in mpol_misplaced.

On Sat 17-02-24 01:31:34, Donet Tom wrote:
> We will update MPOL_PREFERRED_MANY in the follow up patch. This change
> is required for that.

Why is it a separate patch then? Does it make review of the next patch
easier? If so make it explicit in the changelog.

> 
> Signed-off-by: Aneesh Kumar K.V (IBM) <aneesh.kumar@...nel.org>
> Signed-off-by: Donet Tom <donettom@...ux.ibm.com>
> ---
>  mm/mempolicy.c | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/mm/mempolicy.c b/mm/mempolicy.c
> index 8478574c000c..73d698e21dae 100644
> --- a/mm/mempolicy.c
> +++ b/mm/mempolicy.c
> @@ -2515,7 +2515,15 @@ int mpol_misplaced(struct folio *folio, struct vm_area_struct *vma,
>  				break;
>  			goto out;
>  		}
> -		fallthrough;
> +
> +		if (node_isset(curnid, pol->nodes))
> +			goto out;
> +		z = first_zones_zonelist(
> +				node_zonelist(thisnid, GFP_HIGHUSER),
> +				gfp_zone(GFP_HIGHUSER),
> +				&pol->nodes);
> +		polnid = zone_to_nid(z->zone);
> +		break;
>  
>  	case MPOL_PREFERRED_MANY:
>  		/*
> -- 
> 2.39.3

-- 
Michal Hocko
SUSE Labs