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From: Nikita Ermakov <sh1r4s3@mail.si-head.nl>
To: linux-mm@kvack.org
Cc: Nikita Ermakov <sh1r4s3@mail.si-head.nl>,
	Andrew Morton <akpm@linux-foundation.org>
Subject: [PATCH v2] mm/msync: exit early when the flags is an MS_ASYNC and start < vm_start
Date: Tue, 20 Oct 2020 23:56:41 +0300	[thread overview]
Message-ID: <20201020205640.48257-1-sh1r4s3@mail.si-head.nl> (raw)
In-Reply-To: <94E11FCB-AA03-490B-9F9E-2508DC8A15D1@mail.si-head.nl>

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) {
+			if (flags == MS_ASYNC)
+				goto out_unlock;
 			start = vma->vm_start;
 			if (start >= end)
 				goto out_unlock;

base-commit: 6824a8a9b4861d7df7ee132a952bdf6f84a99cb8
-- 
2.28.0



  reply	other threads:[~2020-10-20 21:02 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         ` Nikita Ermakov [this message]
2020-10-23 11:12           ` [PATCH v2] " Vlastimil Babka
2020-10-25  9:29             ` [PATCH v3] " Nikita Ermakov
2020-10-25  9:38             ` [PATCH v2] " Nikita Ermakov

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