Move __set/clear_bit from ubifs.h to bitops.h

__set_bit and __clear_bit are defined in ubifs.h as well as in
asm/include/bitops.h for some architectures. This patch moves
the generic implementation to include/linux/bitops.h and uses
that unless it's defined by the architecture.

Signed-off-by: Simon Kagstrom <simon.kagstrom@netinsight.net>

5 files changed, 43 insertions, 0 deletions

diff --git a/include/asm-arm/bitops.h b/include/asm-arm/bitops.h
index 4b8bab2837..1549da1693 100644
--- a/include/asm-arm/bitops.h
+++ b/include/asm-arm/bitops.h
@@ -29,6 +29,7 @@ static inline void __set_bit(int nr, volatile void *addr)
 {
 	((unsigned char *) addr)[nr >> 3] |= (1U << (nr & 7));
 }
+#define __set_bit
 
 extern void clear_bit(int nr, volatile void * addr);
 
@@ -36,6 +37,7 @@ static inline void __clear_bit(int nr, volatile void *addr)
 {
 	((unsigned char *) addr)[nr >> 3] &= ~(1U << (nr & 7));
 }
+#define __clear_bit
 
 extern void change_bit(int nr, volatile void * addr);
 
diff --git a/include/asm-blackfin/bitops.h b/include/asm-blackfin/bitops.h
index 2e55b6a619..cc3685d35d 100644
--- a/include/asm-blackfin/bitops.h
+++ b/include/asm-blackfin/bitops.h
@@ -79,6 +79,7 @@ static __inline__ void __set_bit(int nr, volatile void *addr)
 	mask = 1 << (nr & 0x1f);
 	*a |= mask;
 }
+#define __set_bit
 
 /*
  * clear_bit() doesn't provide any barrier for the compiler.
diff --git a/include/asm-microblaze/bitops.h b/include/asm-microblaze/bitops.h
index 04ea0207ee..aac906102a 100644
--- a/include/asm-microblaze/bitops.h
+++ b/include/asm-microblaze/bitops.h
@@ -75,6 +75,7 @@ extern __inline__ void __set_bit(int nr, volatile void * addr)
 	mask = 1 << (nr & 0x1f);
 	*a |= mask;
 }
+#define __set_bit
 
 /*
  * clear_bit() doesn't provide any barrier for the compiler.
diff --git a/include/asm-mips/bitops.h b/include/asm-mips/bitops.h
index 659ac9d320..0c07b686a2 100644
--- a/include/asm-mips/bitops.h
+++ b/include/asm-mips/bitops.h
@@ -90,6 +90,7 @@ static __inline__ void __set_bit(int nr, volatile void * addr)
 
 	*m |= 1UL << (nr & 31);
 }
+#define __set_bit
 
 /*
  * clear_bit - Clears a bit in memory
diff --git a/include/linux/bitops.h b/include/linux/bitops.h
index 7d41ae62cc..387a81813b 100644
--- a/include/linux/bitops.h
+++ b/include/linux/bitops.h
@@ -1,6 +1,7 @@
 #ifndef _LINUX_BITOPS_H
 #define _LINUX_BITOPS_H
 
+#include <asm/types.h>
 
 /*
  * ffs: find first bit set. This is defined the same way as
@@ -66,7 +67,44 @@ static inline unsigned int generic_hweight8(unsigned int w)
 	return (res & 0x0F) + ((res >> 4) & 0x0F);
 }
 
+#define BIT_MASK(nr)		(1UL << ((nr) % BITS_PER_LONG))
+#define BIT_WORD(nr)		((nr) / BITS_PER_LONG)
+
 #include <asm/bitops.h>
 
+/* linux/include/asm-generic/bitops/non-atomic.h */
+
+#ifndef __set_bit
+# define __set_bit generic_set_bit
+#endif
+
+#ifndef __clear_bit
+# define __clear_bit generic_clear_bit
+#endif
+
+/**
+ * __set_bit - Set a bit in memory
+ * @nr: the bit to set
+ * @addr: the address to start counting from
+ *
+ * Unlike set_bit(), this function is non-atomic and may be reordered.
+ * If it's called on the same region of memory simultaneously, the effect
+ * may be that only one operation succeeds.
+ */
+static inline void generic_set_bit(int nr, volatile unsigned long *addr)
+{
+	unsigned long mask = BIT_MASK(nr);
+	unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
+
+	*p  |= mask;
+}
+
+static inline void generic_clear_bit(int nr, volatile unsigned long *addr)
+{
+	unsigned long mask = BIT_MASK(nr);
+	unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
+
+	*p &= ~mask;
+}
 
 #endif