[PATCH v2 24/34] futex: convert put_page() to put_user_page*()

john.hubbard at gmail.com john.hubbard at gmail.com
Sun Aug 4 22:49:05 UTC 2019


From: John Hubbard <jhubbard at nvidia.com>

For pages that were retained via get_user_pages*(), release those pages
via the new put_user_page*() routines, instead of via put_page() or
release_pages().

This is part a tree-wide conversion, as described in commit fc1d8e7cca2d
("mm: introduce put_user_page*(), placeholder versions").

Cc: Thomas Gleixner <tglx at linutronix.de>
Cc: Ingo Molnar <mingo at redhat.com>
Cc: Peter Zijlstra <peterz at infradead.org>
Cc: Darren Hart <dvhart at infradead.org>
Signed-off-by: John Hubbard <jhubbard at nvidia.com>
---
 kernel/futex.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/kernel/futex.c b/kernel/futex.c
index 6d50728ef2e7..4b4cae58ec57 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -623,7 +623,7 @@ get_futex_key(u32 __user *uaddr, int fshared, union futex_key *key, enum futex_a
 		lock_page(page);
 		shmem_swizzled = PageSwapCache(page) || page->mapping;
 		unlock_page(page);
-		put_page(page);
+		put_user_page(page);
 
 		if (shmem_swizzled)
 			goto again;
@@ -675,7 +675,7 @@ get_futex_key(u32 __user *uaddr, int fshared, union futex_key *key, enum futex_a
 
 		if (READ_ONCE(page->mapping) != mapping) {
 			rcu_read_unlock();
-			put_page(page);
+			put_user_page(page);
 
 			goto again;
 		}
@@ -683,7 +683,7 @@ get_futex_key(u32 __user *uaddr, int fshared, union futex_key *key, enum futex_a
 		inode = READ_ONCE(mapping->host);
 		if (!inode) {
 			rcu_read_unlock();
-			put_page(page);
+			put_user_page(page);
 
 			goto again;
 		}
@@ -702,7 +702,7 @@ get_futex_key(u32 __user *uaddr, int fshared, union futex_key *key, enum futex_a
 		 */
 		if (!atomic_inc_not_zero(&inode->i_count)) {
 			rcu_read_unlock();
-			put_page(page);
+			put_user_page(page);
 
 			goto again;
 		}
@@ -723,7 +723,7 @@ get_futex_key(u32 __user *uaddr, int fshared, union futex_key *key, enum futex_a
 	}
 
 out:
-	put_page(page);
+	put_user_page(page);
 	return err;
 }
 
-- 
2.22.0



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