linux-kernel - Re: [PATCH 4/5] mm/madvise: thread all madvise state through madv

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Message-ID: <2f6a2210-7327-4270-b072-0047936144c7@suse.cz>
Date: Fri, 20 Jun 2025 16:16:07 +0200
From: Vlastimil Babka <vbabka@...e.cz>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
 Andrew Morton <akpm@...ux-foundation.org>
Cc: David Hildenbrand <david@...hat.com>, Zi Yan <ziy@...dia.com>,
 Baolin Wang <baolin.wang@...ux.alibaba.com>,
 "Liam R . Howlett" <Liam.Howlett@...cle.com>, Nico Pache
 <npache@...hat.com>, Ryan Roberts <ryan.roberts@....com>,
 Dev Jain <dev.jain@....com>, Barry Song <baohua@...nel.org>,
 Jann Horn <jannh@...gle.com>, linux-mm@...ck.org,
 linux-kernel@...r.kernel.org, Lance Yang <ioworker0@...il.com>,
 SeongJae Park <sj@...nel.org>, Suren Baghdasaryan <surenb@...gle.com>
Subject: Re: [PATCH 4/5] mm/madvise: thread all madvise state through
 madv_behavior

On 6/19/25 22:26, Lorenzo Stoakes wrote:
> @@ -1662,13 +1668,16 @@ int madvise_walk_vmas(struct madvise_behavior *madv_behavior)
>  		range->end = min(vma->vm_end, end);
>  
>  		/* Here vma->vm_start <= range->start < range->end <= (end|vma->vm_end). */
> -		error = madvise_vma_behavior(vma, &prev, madv_behavior);
> +		madv_behavior->vma = vma;
> +		error = madvise_vma_behavior(madv_behavior);
>  		if (error)
>  			return error;
> +		prev = madv_behavior->prev;
> +
>  		range->start = range->end;
>  		if (prev && range->start < prev->vm_end)
>  			range->start = prev->vm_end;
> -		if (range->start >= range->end)
> +		if (range->start >= end)

I believe this change is fixing a bug from patch 3/5 (which I didn't catch,
sigh).

>  			break;
>  		if (prev)
>  			vma = find_vma(mm, prev->vm_end);