alpha: cleanup in bitops.h
Remove 2 functions private to the alpha implemetation, in favor of similar functions in <linux/log2.h>. Provide a more efficient version of the fls64 function for pre-ev67 alphas. Signed-off-by: Richard Henderson <rth@twiddle.net> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -7,6 +7,7 @@
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#include <linux/pci.h>
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#include <linux/slab.h>
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#include <linux/bootmem.h>
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#include <linux/log2.h>
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#include <asm/io.h>
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#include <asm/hwrpb.h>
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@ -53,7 +54,7 @@ size_for_memory(unsigned long max)
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{
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unsigned long mem = max_low_pfn << PAGE_SHIFT;
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if (mem < max)
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max = 1UL << ceil_log2(mem);
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max = roundup_pow_of_two(mem);
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return max;
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}
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@ -43,6 +43,7 @@
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#include <linux/notifier.h>
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#include <asm/setup.h>
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#include <asm/io.h>
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#include <linux/log2.h>
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extern struct atomic_notifier_head panic_notifier_list;
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static int alpha_panic_event(struct notifier_block *, unsigned long, void *);
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@ -1303,7 +1304,7 @@ external_cache_probe(int minsize, int width)
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long size = minsize, maxsize = MAX_BCACHE_SIZE * 2;
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if (maxsize > (max_low_pfn + 1) << PAGE_SHIFT)
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maxsize = 1 << (floor_log2(max_low_pfn + 1) + PAGE_SHIFT);
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maxsize = 1 << (ilog2(max_low_pfn + 1) + PAGE_SHIFT);
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/* Get the first block cached. */
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read_mem_block(__va(0), stride, size);
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@ -37,7 +37,8 @@ lib-y = __divqu.o __remqu.o __divlu.o __remlu.o \
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$(ev6-y)clear_page.o \
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$(ev6-y)copy_page.o \
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fpreg.o \
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callback_srm.o srm_puts.o srm_printk.o
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callback_srm.o srm_puts.o srm_printk.o \
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fls.o
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lib-$(CONFIG_SMP) += dec_and_lock.o
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@ -0,0 +1,38 @@
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/*
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* arch/alpha/lib/fls.c
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*/
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#include <linux/module.h>
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#include <asm/bitops.h>
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/* This is fls(x)-1, except zero is held to zero. This allows most
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efficent input into extbl, plus it allows easy handling of fls(0)=0. */
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const unsigned char __flsm1_tab[256] =
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{
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0,
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0,
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1, 1,
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2, 2, 2, 2,
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3, 3, 3, 3, 3, 3, 3, 3,
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4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
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5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
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5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
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6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
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6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
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6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
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6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
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7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
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7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
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7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
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7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
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7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
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7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
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7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
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7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
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};
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EXPORT_SYMBOL(__flsm1_tab);
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@ -313,32 +313,29 @@ static inline int ffs(int word)
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* fls: find last bit set.
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*/
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#if defined(CONFIG_ALPHA_EV6) && defined(CONFIG_ALPHA_EV67)
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static inline int fls(int word)
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static inline int fls64(unsigned long word)
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{
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return 64 - __kernel_ctlz(word & 0xffffffff);
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return 64 - __kernel_ctlz(word);
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}
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#else
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#include <asm-generic/bitops/fls.h>
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#endif
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#include <asm-generic/bitops/fls64.h>
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extern const unsigned char __flsm1_tab[256];
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/* Compute powers of two for the given integer. */
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static inline long floor_log2(unsigned long word)
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static inline int fls64(unsigned long x)
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{
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#if defined(CONFIG_ALPHA_EV6) && defined(CONFIG_ALPHA_EV67)
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return 63 - __kernel_ctlz(word);
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#else
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long bit;
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for (bit = -1; word ; bit++)
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word >>= 1;
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return bit;
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#endif
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unsigned long t, a, r;
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t = __kernel_cmpbge (x, 0x0101010101010101);
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a = __flsm1_tab[t];
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t = __kernel_extbl (x, a);
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r = a*8 + __flsm1_tab[t] + (x != 0);
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return r;
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}
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#endif
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static inline long ceil_log2(unsigned long word)
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static inline int fls(int x)
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{
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long bit = floor_log2(word);
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return bit + (word > (1UL << bit));
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return fls64((unsigned int) x);
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}
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/*
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@ -353,9 +350,20 @@ static inline unsigned long hweight64(unsigned long w)
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return __kernel_ctpop(w);
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}
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#define hweight32(x) (unsigned int) hweight64((x) & 0xfffffffful)
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#define hweight16(x) (unsigned int) hweight64((x) & 0xfffful)
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#define hweight8(x) (unsigned int) hweight64((x) & 0xfful)
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static inline unsigned int hweight32(unsigned int w)
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{
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return hweight64(w);
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}
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static inline unsigned int hweight16(unsigned int w)
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{
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return hweight64(w & 0xffff);
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}
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static inline unsigned int hweight8(unsigned int w)
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{
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return hweight64(w & 0xff);
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}
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#else
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#include <asm-generic/bitops/hweight.h>
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#endif
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