linux-kernel - Re: [PATCH] mm/mmap: Don't unlock VMAs in remap_file

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Message-ID: <20201215145040.GT2443@casper.infradead.org>
Date:   Tue, 15 Dec 2020 14:50:40 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     "Liam R. Howlett" <Liam.Howlett@...cle.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...gle.com>
Subject: Re: [PATCH] mm/mmap: Don't unlock VMAs in remap_file_pages()

On Tue, Dec 15, 2020 at 09:13:00AM -0500, Liam R. Howlett wrote:
> @@ -3025,25 +3025,6 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size,
>  
>  	flags &= MAP_NONBLOCK;
>  	flags |= MAP_SHARED | MAP_FIXED | MAP_POPULATE;
> -	if (vma->vm_flags & VM_LOCKED) {
> -		struct vm_area_struct *tmp;
> -		flags |= MAP_LOCKED;

I think you need to keep ^^^ that line because the vma needs to stay
mlocked.