forked from luck/tmp_suning_uos_patched
[PATCH] LOG2: Provide ilog2() fallbacks for powerpc
Provide ilog2() fallbacks for powerpc for 32-bit numbers and 64-bit numbers on ppc64. Signed-off-by: David Howells <dhowells@redhat.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -43,11 +43,11 @@ config RWSEM_XCHGADD_ALGORITHM
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config ARCH_HAS_ILOG2_U32
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bool
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default n
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default y
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config ARCH_HAS_ILOG2_U64
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bool
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default n
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default y if 64BIT
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config GENERIC_HWEIGHT
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bool
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@ -190,7 +190,8 @@ static __inline__ void set_bits(unsigned long mask, unsigned long *addr)
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* Return the zero-based bit position (LE, not IBM bit numbering) of
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* the most significant 1-bit in a double word.
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*/
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static __inline__ int __ilog2(unsigned long x)
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static __inline__ __attribute__((const))
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int __ilog2(unsigned long x)
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{
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int lz;
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@ -198,6 +199,24 @@ static __inline__ int __ilog2(unsigned long x)
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return BITS_PER_LONG - 1 - lz;
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}
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static inline __attribute__((const))
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int __ilog2_u32(u32 n)
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{
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int bit;
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asm ("cntlzw %0,%1" : "=r" (bit) : "r" (n));
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return 31 - bit;
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}
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#ifdef __powerpc64__
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static inline __attribute__((const))
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int __ilog2_u64(u32 n)
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{
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int bit;
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asm ("cntlzd %0,%1" : "=r" (bit) : "r" (n));
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return 63 - bit;
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}
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#endif
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/*
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* Determines the bit position of the least significant 0 bit in the
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* specified double word. The returned bit position will be
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@ -26,15 +26,7 @@ extern void clear_pages(void *page, int order);
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static inline void clear_page(void *page) { clear_pages(page, 0); }
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extern void copy_page(void *to, void *from);
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/* Pure 2^n version of get_order */
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extern __inline__ int get_order(unsigned long size)
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{
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int lz;
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size = (size-1) >> PAGE_SHIFT;
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asm ("cntlzw %0,%1" : "=r" (lz) : "r" (size));
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return 32 - lz;
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}
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#include <asm-generic/page.h>
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#endif /* __ASSEMBLY__ */
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