linux-kernel - [PATCH 1/4] ipc/shm: do not check for MAP

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Date:   Thu,  9 Feb 2017 12:52:59 -0800
From:   Davidlohr Bueso <dave@...olabs.net>
To:     akpm@...ux-foundation.org
Cc:     manfred@...orfullife.com, dave@...olabs.net,
        linux-kernel@...r.kernel.org, Davidlohr Bueso <dbueso@...e.de>
Subject: [PATCH 1/4] ipc/shm: do not check for MAP_POPULATE

We do not support prefaulting functionality in sysv shm,
nor MAP_NONBLOCK for that matter. Drop the pointless check
for populate in do_shmat().

Signed-off-by: Davidlohr Bueso <dbueso@...e.de>
---
 ipc/shm.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/ipc/shm.c b/ipc/shm.c
index 06ea9ef7f54a..6b3769967789 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -1234,8 +1234,6 @@ long do_shmat(int shmid, char __user *shmaddr, int shmflg,
 		err = (long)addr;
 invalid:
 	up_write(&current->mm->mmap_sem);
-	if (populate)
-		mm_populate(addr, populate);
 
 out_fput:
 	fput(file);
-- 
2.6.6