[PATCH] bitops: arm: use generic bitops

- remove __{,test_and_}{set,clear,change}_bit() and test_bit()

- if __LINUX_ARM_ARCH__ < 5

  - remove ffz()
  - remove __ffs()
  - remove generic_fls()
  - remove generic_ffs()

- remove generic_fls64()
- remove sched_find_first_bit()
- remove generic_hweight{32,16,8}()

Signed-off-by: Akinobu Mita <mita@miraclelinux.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/arm/Kconfig

@@ -53,6 +53,10 @@ config RWSEM_GENERIC_SPINLOCK
 config RWSEM_XCHGADD_ALGORITHM
 	bool
 
+config GENERIC_HWEIGHT
+	bool
+	default y
+
 config GENERIC_CALIBRATE_DELAY
 	bool
 	default y

include/asm-arm/bitops.h

@@ -117,65 +117,7 @@ ____atomic_test_and_change_bit(unsigned int bit, volatile unsigned long *p)
 	return res & mask;
 }
 
-/*
- * Now the non-atomic variants.  We let the compiler handle all
- * optimisations for these.  These are all _native_ endian.
- */
-static inline void __set_bit(int nr, volatile unsigned long *p)
-{
-	p[nr >> 5] |= (1UL << (nr & 31));
-}
-
-static inline void __clear_bit(int nr, volatile unsigned long *p)
-{
-	p[nr >> 5] &= ~(1UL << (nr & 31));
-}
-
-static inline void __change_bit(int nr, volatile unsigned long *p)
-{
-	p[nr >> 5] ^= (1UL << (nr & 31));
-}
-
-static inline int __test_and_set_bit(int nr, volatile unsigned long *p)
-{
-	unsigned long oldval, mask = 1UL << (nr & 31);
-
-	p += nr >> 5;
-
-	oldval = *p;
-	*p = oldval | mask;
-	return oldval & mask;
-}
-
-static inline int __test_and_clear_bit(int nr, volatile unsigned long *p)
-{
-	unsigned long oldval, mask = 1UL << (nr & 31);
-
-	p += nr >> 5;
-
-	oldval = *p;
-	*p = oldval & ~mask;
-	return oldval & mask;
-}
-
-static inline int __test_and_change_bit(int nr, volatile unsigned long *p)
-{
-	unsigned long oldval, mask = 1UL << (nr & 31);
-
-	p += nr >> 5;
-
-	oldval = *p;
-	*p = oldval ^ mask;
-	return oldval & mask;
-}
-
-/*
- * This routine doesn't need to be atomic.
- */
-static inline int __test_bit(int nr, const volatile unsigned long * p)
-{
-	return (p[nr >> 5] >> (nr & 31)) & 1UL;
-}
+#include <asm-generic/bitops/non-atomic.h>
 
 /*
  *  A note about Endian-ness.
@@ -261,7 +203,6 @@ extern int _find_next_bit_be(const unsigned long *p, int size, int offset);
 #define test_and_set_bit(nr,p)		ATOMIC_BITOP_LE(test_and_set_bit,nr,p)
 #define test_and_clear_bit(nr,p)	ATOMIC_BITOP_LE(test_and_clear_bit,nr,p)
 #define test_and_change_bit(nr,p)	ATOMIC_BITOP_LE(test_and_change_bit,nr,p)
-#define test_bit(nr,p)			__test_bit(nr,p)
 #define find_first_zero_bit(p,sz)	_find_first_zero_bit_le(p,sz)
 #define find_next_zero_bit(p,sz,off)	_find_next_zero_bit_le(p,sz,off)
 #define find_first_bit(p,sz)		_find_first_bit_le(p,sz)
@@ -280,7 +221,6 @@ extern int _find_next_bit_be(const unsigned long *p, int size, int offset);
 #define test_and_set_bit(nr,p)		ATOMIC_BITOP_BE(test_and_set_bit,nr,p)
 #define test_and_clear_bit(nr,p)	ATOMIC_BITOP_BE(test_and_clear_bit,nr,p)
 #define test_and_change_bit(nr,p)	ATOMIC_BITOP_BE(test_and_change_bit,nr,p)
-#define test_bit(nr,p)			__test_bit(nr,p)
 #define find_first_zero_bit(p,sz)	_find_first_zero_bit_be(p,sz)
 #define find_next_zero_bit(p,sz,off)	_find_next_zero_bit_be(p,sz,off)
 #define find_first_bit(p,sz)		_find_first_bit_be(p,sz)
@@ -292,55 +232,10 @@ extern int _find_next_bit_be(const unsigned long *p, int size, int offset);
 
 #if __LINUX_ARM_ARCH__ < 5
 
-/*
- * ffz = Find First Zero in word. Undefined if no zero exists,
- * so code should check against ~0UL first..
- */
-static inline unsigned long ffz(unsigned long word)
-{
-	int k;
-
-	word = ~word;
-	k = 31;
-	if (word & 0x0000ffff) { k -= 16; word <<= 16; }
-	if (word & 0x00ff0000) { k -= 8;  word <<= 8;  }
-	if (word & 0x0f000000) { k -= 4;  word <<= 4;  }
-	if (word & 0x30000000) { k -= 2;  word <<= 2;  }
-	if (word & 0x40000000) { k -= 1; }
-        return k;
-}
-
-/*
- * ffz = Find First Zero in word. Undefined if no zero exists,
- * so code should check against ~0UL first..
- */
-static inline unsigned long __ffs(unsigned long word)
-{
-	int k;
-
-	k = 31;
-	if (word & 0x0000ffff) { k -= 16; word <<= 16; }
-	if (word & 0x00ff0000) { k -= 8;  word <<= 8;  }
-	if (word & 0x0f000000) { k -= 4;  word <<= 4;  }
-	if (word & 0x30000000) { k -= 2;  word <<= 2;  }
-	if (word & 0x40000000) { k -= 1; }
-        return k;
-}
-
-/*
- * fls: find last bit set.
- */
-
-#define fls(x) generic_fls(x)
-#define fls64(x)   generic_fls64(x)
-
-/*
- * ffs: find first bit set. This is defined the same way as
- * the libc and compiler builtin ffs routines, therefore
- * differs in spirit from the above ffz (man ffs).
- */
-
-#define ffs(x) generic_ffs(x)
+#include <asm-generic/bitops/ffz.h>
+#include <asm-generic/bitops/__ffs.h>
+#include <asm-generic/bitops/fls.h>
+#include <asm-generic/bitops/ffs.h>
 
 #else
 
@@ -381,37 +276,16 @@ static inline int constant_fls(int x)
 #define fls(x) \
 	( __builtin_constant_p(x) ? constant_fls(x) : \
 	  ({ int __r; asm("clz\t%0, %1" : "=r"(__r) : "r"(x) : "cc"); 32-__r; }) )
-#define fls64(x)   generic_fls64(x)
 #define ffs(x) ({ unsigned long __t = (x); fls(__t & -__t); })
 #define __ffs(x) (ffs(x) - 1)
 #define ffz(x) __ffs( ~(x) )
 
 #endif
 
-/*
- * Find first bit set in a 168-bit bitmap, where the first
- * 128 bits are unlikely to be set.
- */
-static inline int sched_find_first_bit(const unsigned long *b)
-{
-	unsigned long v;
-	unsigned int off;
-
-	for (off = 0; v = b[off], off < 4; off++) {
-		if (unlikely(v))
-			break;
-	}
-	return __ffs(v) + off * 32;
-}
-
-/*
- * hweightN: returns the hamming weight (i.e. the number
- * of bits set) of a N-bit word
- */
+#include <asm-generic/bitops/fls64.h>
 
-#define hweight32(x) generic_hweight32(x)
-#define hweight16(x) generic_hweight16(x)
-#define hweight8(x) generic_hweight8(x)
+#include <asm-generic/bitops/sched.h>
+#include <asm-generic/bitops/hweight.h>
 
 /*
  * Ext2 is defined to use little-endian byte ordering.
@@ -426,7 +300,7 @@ static inline int sched_find_first_bit(const unsigned long *b)
 #define ext2_clear_bit_atomic(lock,nr,p)        \
                 test_and_clear_bit(WORD_BITOFF_TO_LE(nr), (unsigned long *)(p))
 #define ext2_test_bit(nr,p)			\
-		__test_bit(WORD_BITOFF_TO_LE(nr), (unsigned long *)(p))
+		test_bit(WORD_BITOFF_TO_LE(nr), (unsigned long *)(p))
 #define ext2_find_first_zero_bit(p,sz)		\
 		_find_first_zero_bit_le(p,sz)
 #define ext2_find_next_zero_bit(p,sz,off)	\
@@ -439,7 +313,7 @@ static inline int sched_find_first_bit(const unsigned long *b)
 #define minix_set_bit(nr,p)			\
 		__set_bit(WORD_BITOFF_TO_LE(nr), (unsigned long *)(p))
 #define minix_test_bit(nr,p)			\
-		__test_bit(WORD_BITOFF_TO_LE(nr), (unsigned long *)(p))
+		test_bit(WORD_BITOFF_TO_LE(nr), (unsigned long *)(p))
 #define minix_test_and_set_bit(nr,p)		\
 		__test_and_set_bit(WORD_BITOFF_TO_LE(nr), (unsigned long *)(p))
 #define minix_test_and_clear_bit(nr,p)		\