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From: Vlastimil Babka <vbabka@suse.cz>
To: Nikita Ermakov <sh1r4s3@mail.si-head.nl>, linux-mm@kvack.org
Cc: Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH v2] mm/msync: exit early when the flags is an MS_ASYNC and start < vm_start
Date: Fri, 23 Oct 2020 13:12:11 +0200	[thread overview]
Message-ID: <bb6e370a-8901-5db0-1057-90414ea085e2@suse.cz> (raw)
In-Reply-To: <20201020205640.48257-1-sh1r4s3@mail.si-head.nl>

On 10/20/20 10:56 PM, Nikita Ermakov wrote:
> If an unmapped region was found and the flag is MS_ASYNC (without
> MS_INVALIDATE) there is nothing to do and the result would be always
> -ENOMEM, so return immediately.
> 
> Signed-off-by: Nikita Ermakov <sh1r4s3@mail.si-head.nl>
> ---
>   mm/msync.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/mm/msync.c b/mm/msync.c
> index 69c6d2029531..ed20c3621d4c 100644
> --- a/mm/msync.c
> +++ b/mm/msync.c
> @@ -69,6 +69,8 @@ SYSCALL_DEFINE3(msync, unsigned long, start, size_t, len, int, flags)
>   			goto out_unlock;
>   		/* Here start < vma->vm_end. */
>   		if (start < vma->vm_start) {

I hoped it would become a code comment.

> +			if (flags == MS_ASYNC)
> +				goto out_unlock;
>   			start = vma->vm_start;
>   			if (start >= end)
>   				goto out_unlock;
> 
> base-commit: 6824a8a9b4861d7df7ee132a952bdf6f84a99cb8
> 



  reply	other threads:[~2020-10-23 11:12 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-12 16:09 [PATCH] " Nikita Ermakov
2020-10-20 10:19 ` Vlastimil Babka
2020-10-20 14:38   ` Nikita
2020-10-20 15:03     ` Vlastimil Babka
2020-10-20 16:19       ` Nikita
2020-10-20 20:56         ` [PATCH v2] " Nikita Ermakov
2020-10-23 11:12           ` Vlastimil Babka [this message]
2020-10-25  9:29             ` [PATCH v3] " Nikita Ermakov
2020-10-25  9:38             ` [PATCH v2] " Nikita Ermakov

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