linux-kernel - [PATCH 3.2 17/94] Revert "sparc64: Fix __copy_{to,from}_user

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Date:	Mon, 28 Apr 2014 02:11:21 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Dave Kleikamp" <dave.kleikamp@...cle.com>,
	"Hugh Dickins" <hughd@...gle.com>, sparclinux@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.2 17/94] Revert "sparc64: Fix __copy_{to,from}_user_inatomic
  defines."

3.2.58-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Dave Kleikamp <dave.kleikamp@...cle.com>

[ Upstream commit 16932237f2978a2265662f8de4af743b1f55a209 ]

This reverts commit 145e1c0023585e0e8f6df22316308ec61c5066b2.

This commit broke the behavior of __copy_from_user_inatomic when
it is only partially successful. Instead of returning the number
of bytes not copied, it now returns 1. This translates to the
wrong value being returned by iov_iter_copy_from_user_atomic.

xfstests generic/246 and LTP writev01 both fail on btrfs and nfs
because of this.

Signed-off-by: Dave Kleikamp <dave.kleikamp@...cle.com>
Cc: Hugh Dickins <hughd@...gle.com>
Cc: David S. Miller <davem@...emloft.net>
Cc: sparclinux@...r.kernel.org
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/sparc/include/asm/uaccess_64.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/sparc/include/asm/uaccess_64.h b/arch/sparc/include/asm/uaccess_64.h
index 3e1449f..6d6c731 100644
--- a/arch/sparc/include/asm/uaccess_64.h
+++ b/arch/sparc/include/asm/uaccess_64.h
@@ -267,8 +267,8 @@ extern long __strnlen_user(const char __user *, long len);
 
 #define strlen_user __strlen_user
 #define strnlen_user __strnlen_user
-#define __copy_to_user_inatomic ___copy_to_user
-#define __copy_from_user_inatomic ___copy_from_user
+#define __copy_to_user_inatomic __copy_to_user
+#define __copy_from_user_inatomic __copy_from_user
 
 #endif  /* __ASSEMBLY__ */
 

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