From 4b15de08fe4d2c9d12a3764394731018a763216b Mon Sep 17 00:00:00 2001 From: Simon Kagstrom Date: Mon, 24 Aug 2009 09:10:03 +0200 Subject: [PATCH] arm: Make arm bitops endianness-independent Bring over the bitop implementations from the Linux include/asm-generic/bitops/non-atomic.h to provide endianness-independence. Signed-off-by: Simon Kagstrom --- include/asm-arm/bitops.h | 47 ++++++++++++++++------------------------ 1 file changed, 19 insertions(+), 28 deletions(-) diff --git a/include/asm-arm/bitops.h b/include/asm-arm/bitops.h index 1549da1693..854e225c2f 100644 --- a/include/asm-arm/bitops.h +++ b/include/asm-arm/bitops.h @@ -25,61 +25,52 @@ */ extern void set_bit(int nr, volatile void * addr); -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); -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); static inline void __change_bit(int nr, volatile void *addr) { - ((unsigned char *) addr)[nr >> 3] ^= (1U << (nr & 7)); + unsigned long mask = BIT_MASK(nr); + unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr); + + *p ^= mask; } extern int test_and_set_bit(int nr, volatile void * addr); static inline int __test_and_set_bit(int nr, volatile void *addr) { - unsigned int mask = 1 << (nr & 7); - unsigned int oldval; + unsigned long mask = BIT_MASK(nr); + unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr); + unsigned long old = *p; - oldval = ((unsigned char *) addr)[nr >> 3]; - ((unsigned char *) addr)[nr >> 3] = oldval | mask; - return oldval & mask; + *p = old | mask; + return (old & mask) != 0; } extern int test_and_clear_bit(int nr, volatile void * addr); static inline int __test_and_clear_bit(int nr, volatile void *addr) { - unsigned int mask = 1 << (nr & 7); - unsigned int oldval; + unsigned long mask = BIT_MASK(nr); + unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr); + unsigned long old = *p; - oldval = ((unsigned char *) addr)[nr >> 3]; - ((unsigned char *) addr)[nr >> 3] = oldval & ~mask; - return oldval & mask; + *p = old & ~mask; + return (old & mask) != 0; } extern int test_and_change_bit(int nr, volatile void * addr); static inline int __test_and_change_bit(int nr, volatile void *addr) { - unsigned int mask = 1 << (nr & 7); - unsigned int oldval; + unsigned long mask = BIT_MASK(nr); + unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr); + unsigned long old = *p; - oldval = ((unsigned char *) addr)[nr >> 3]; - ((unsigned char *) addr)[nr >> 3] = oldval ^ mask; - return oldval & mask; + *p = old ^ mask; + return (old & mask) != 0; } extern int find_first_zero_bit(void * addr, unsigned size); -- 2.30.2