提交 bc818247 编写于 作者: A Atsushi Nemoto 提交者: Ralf Baechle

[MIPS] Fix bitops for MIPS32/MIPS64 CPUs.

    
With recent rewrite for generic bitops, fls() for 32bit kernel with
MIPS64_CPU is broken.  Also, ffs(), fls() should be defined the same
way as the libc and compiler built-in routines (returns int instead of
unsigned long).
Signed-off-by: NAtsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
上级 c0858d82
......@@ -467,64 +467,56 @@ static inline unsigned long __ffs(unsigned long word)
}
/*
* ffs - find first bit set.
* fls - find last bit set.
* @word: The word to search
*
* Returns 1..SZLONG
* Returns 0 if no bit exists
* This is defined the same way as ffs.
* Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
*/
static inline unsigned long ffs(unsigned long word)
static inline int fls(int word)
{
if (!word)
return 0;
__asm__ ("clz %0, %1" : "=r" (word) : "r" (word));
return __ffs(word) + 1;
return 32 - word;
}
/*
* ffz - find first zero in word.
* @word: The word to search
*
* Undefined if no zero exists, so code should check against ~0UL first.
*/
static inline unsigned long ffz(unsigned long word)
#if defined(CONFIG_64BIT) && defined(CONFIG_CPU_MIPS64)
static inline int fls64(__u64 word)
{
return __ffs (~word);
__asm__ ("dclz %0, %1" : "=r" (word) : "r" (word));
return 64 - word;
}
#else
#include <asm-generic/bitops/fls64.h>
#endif
/*
* fls - find last bit set.
* ffs - find first bit set.
* @word: The word to search
*
* Returns 1..SZLONG
* Returns 0 if no bit exists
* This is defined the same way as
* the libc and compiler builtin ffs routines, therefore
* differs in spirit from the above ffz (man ffs).
*/
static inline unsigned long fls(unsigned long word)
static inline int ffs(int word)
{
#ifdef CONFIG_CPU_MIPS32
__asm__ ("clz %0, %1" : "=r" (word) : "r" (word));
return 32 - word;
#endif
#ifdef CONFIG_CPU_MIPS64
__asm__ ("dclz %0, %1" : "=r" (word) : "r" (word));
if (!word)
return 0;
return 64 - word;
#endif
return fls(word & -word);
}
#else
#include <asm-generic/bitops/__ffs.h>
#include <asm-generic/bitops/ffs.h>
#include <asm-generic/bitops/ffz.h>
#include <asm-generic/bitops/fls.h>
#include <asm-generic/bitops/fls64.h>
#endif /*defined(CONFIG_CPU_MIPS32) || defined(CONFIG_CPU_MIPS64) */
#include <asm-generic/bitops/fls64.h>
#include <asm-generic/bitops/ffz.h>
#include <asm-generic/bitops/find.h>
#ifdef __KERNEL__
......
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