This patch aims to get rid of endianness in queued_write_unlock(). We
want to set  __qrwlock->wmode to NULL, however the address is not
&lock->cnts in big endian machine. That causes queued_write_unlock()
write NULL to the wrong field of __qrwlock.

Actually qrwlock can have same layout, IOW we can remove the #if
__little_endian in struct __qrwlock. With such modification, we only
need define some _QW* and _QR* with corresponding values in different
endian systems.

Suggested-by: Will Deacon <redacted>
Signed-off-by: Pan Xinhui <redacted>
---
 include/asm-generic/qrwlock.h | 15 +++++++++++----
 kernel/locking/qrwlock.c      | 10 ++++------
 2 files changed, 15 insertions(+), 10 deletions(-)

diff --git a/include/asm-generic/qrwlock.h b/include/asm-generic/qrwlock.h
index 54a8e65..b135c11 100644
--- a/include/asm-generic/qrwlock.h
+++ b/include/asm-generic/qrwlock.h

@@ -27,11 +27,18 @@
 /*
  * Writer states & reader shift and bias
  */
-#define	_QW_WAITING	1		/* A writer is waiting	   */
-#define	_QW_LOCKED	0xff		/* A writer holds the lock */
-#define	_QW_WMASK	0xff		/* Writer mask		   */
+#ifdef	__LITTLE_ENDIAN
 #define	_QR_SHIFT	8		/* Reader count shift	   */
-#define _QR_BIAS	(1U << _QR_SHIFT)
+#define	_QW_SHIFF	0		/* Writer mode shift	*/