asm-generic: make bitops.h usable

bitops.h apparently suffered from some level of bitrot, it
was missing the smp_mb__{before,after}_clear_bit functions,
and included other headers in an invalid order.

This changes the file so that new architectures can use
it out of the box.

Signed-off-by: Remis Lima Baima <[e-mail]>
Signed-off-by: Arnd Bergmann <[e-mail]>

include/asm-generic/bitops.h

···
-#ifndef _ASM_GENERIC_BITOPS_H_
-#define _ASM_GENERIC_BITOPS_H_
+#ifndef __ASM_GENERIC_BITOPS_H
+#define __ASM_GENERIC_BITOPS_H
 
 /*
  * For the benefit of those who are trying to port Linux to another
  * architecture, here are some C-language equivalents.  You should
  * recode these in the native assembly language, if at all possible.
- * 
+ *
  * C language equivalents written by Theodore Ts'o, 9/26/92
  */
 
-#include <asm-generic/bitops/atomic.h>
-#include <asm-generic/bitops/non-atomic.h>
+#include <linux/irqflags.h>
+#include <linux/compiler.h>
+
+/*
+ * clear_bit may not imply a memory barrier
+ */
+#ifndef smp_mb__before_clear_bit
+#define smp_mb__before_clear_bit()	smp_mb()
+#define smp_mb__after_clear_bit()	smp_mb()
+#endif
+
 #include <asm-generic/bitops/__ffs.h>
 #include <asm-generic/bitops/ffz.h>
 #include <asm-generic/bitops/fls.h>
+#include <asm-generic/bitops/__fls.h>
 #include <asm-generic/bitops/fls64.h>
 #include <asm-generic/bitops/find.h>
 
···
 #include <asm-generic/bitops/hweight.h>
 #include <asm-generic/bitops/lock.h>
 
+#include <asm-generic/bitops/atomic.h>
+#include <asm-generic/bitops/non-atomic.h>
 #include <asm-generic/bitops/ext2-non-atomic.h>
 #include <asm-generic/bitops/ext2-atomic.h>
 #include <asm-generic/bitops/minix.h>
 
-#endif /* _ASM_GENERIC_BITOPS_H */
+#endif /* __ASM_GENERIC_BITOPS_H */