linux-kernel - [PATCH 15/64] ipc: use mm locking wrappers

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Date:   Mon,  5 Feb 2018 02:27:05 +0100
From:   Davidlohr Bueso <dbueso@...e.de>
To:     akpm@...ux-foundation.org, mingo@...nel.org
Cc:     peterz@...radead.org, ldufour@...ux.vnet.ibm.com, jack@...e.cz,
        mhocko@...nel.org, kirill.shutemov@...ux.intel.com,
        mawilcox@...rosoft.com, mgorman@...hsingularity.net,
        dave@...olabs.net, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Davidlohr Bueso <dbueso@...e.de>
Subject: [PATCH 15/64] ipc: use mm locking wrappers

From: Davidlohr Bueso <dave@...olabs.net>

This is straightforward as the necessary syscalls already
know about mmrange. No change in semantics.

Signed-off-by: Davidlohr Bueso <dbueso@...e.de>
---
 ipc/shm.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/ipc/shm.c b/ipc/shm.c
index 6c29c791c7f2..4ab752647ca9 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -1398,7 +1398,7 @@ long do_shmat(int shmid, char __user *shmaddr, int shmflg,
 	if (err)
 		goto out_fput;
 
-	if (down_write_killable(&current->mm->mmap_sem)) {
+	if (mm_write_lock_killable(current->mm, &mmrange)) {
 		err = -EINTR;
 		goto out_fput;
 	}
@@ -1419,7 +1419,7 @@ long do_shmat(int shmid, char __user *shmaddr, int shmflg,
 	if (IS_ERR_VALUE(addr))
 		err = (long)addr;
 invalid:
-	up_write(&current->mm->mmap_sem);
+	mm_write_unlock(current->mm, &mmrange);
 	if (populate)
 		mm_populate(addr, populate);
 
@@ -1494,7 +1494,7 @@ SYSCALL_DEFINE1(shmdt, char __user *, shmaddr)
 	if (addr & ~PAGE_MASK)
 		return retval;
 
-	if (down_write_killable(&mm->mmap_sem))
+	if (mm_write_lock_killable(mm, &mmrange))
 		return -EINTR;
 
 	/*
@@ -1585,7 +1585,7 @@ SYSCALL_DEFINE1(shmdt, char __user *, shmaddr)
 
 #endif
 
-	up_write(&mm->mmap_sem);
+	mm_write_unlock(mm, &mmrange);
 	return retval;
 }
 
-- 
2.13.6