diff options
| -rw-r--r-- | arch/alpha/kernel/pci_iommu.c | 3 | ||||
| -rw-r--r-- | arch/alpha/kernel/setup.c | 3 | ||||
| -rw-r--r-- | arch/alpha/lib/Makefile | 3 | ||||
| -rw-r--r-- | arch/alpha/lib/fls.c | 38 | ||||
| -rw-r--r-- | include/asm-alpha/bitops.h | 50 |
5 files changed, 73 insertions, 24 deletions
diff --git a/arch/alpha/kernel/pci_iommu.c b/arch/alpha/kernel/pci_iommu.c index 6e7d1fe6e93..28c84e55feb 100644 --- a/arch/alpha/kernel/pci_iommu.c +++ b/arch/alpha/kernel/pci_iommu.c @@ -7,6 +7,7 @@ #include <linux/pci.h> #include <linux/slab.h> #include <linux/bootmem.h> +#include <linux/log2.h> #include <asm/io.h> #include <asm/hwrpb.h> @@ -53,7 +54,7 @@ size_for_memory(unsigned long max) { unsigned long mem = max_low_pfn << PAGE_SHIFT; if (mem < max) - max = 1UL << ceil_log2(mem); + max = roundup_pow_of_two(mem); return max; } diff --git a/arch/alpha/kernel/setup.c b/arch/alpha/kernel/setup.c index 915f26345c4..bd5e68cd61e 100644 --- a/arch/alpha/kernel/setup.c +++ b/arch/alpha/kernel/setup.c @@ -43,6 +43,7 @@ #include <linux/notifier.h> #include <asm/setup.h> #include <asm/io.h> +#include <linux/log2.h> extern struct atomic_notifier_head panic_notifier_list; static int alpha_panic_event(struct notifier_block *, unsigned long, void *); @@ -1303,7 +1304,7 @@ external_cache_probe(int minsize, int width) long size = minsize, maxsize = MAX_BCACHE_SIZE * 2; if (maxsize > (max_low_pfn + 1) << PAGE_SHIFT) - maxsize = 1 << (floor_log2(max_low_pfn + 1) + PAGE_SHIFT); + maxsize = 1 << (ilog2(max_low_pfn + 1) + PAGE_SHIFT); /* Get the first block cached. */ read_mem_block(__va(0), stride, size); diff --git a/arch/alpha/lib/Makefile b/arch/alpha/lib/Makefile index ea098f3b629..266f78e1307 100644 --- a/arch/alpha/lib/Makefile +++ b/arch/alpha/lib/Makefile @@ -37,7 +37,8 @@ lib-y = __divqu.o __remqu.o __divlu.o __remlu.o \ $(ev6-y)clear_page.o \ $(ev6-y)copy_page.o \ fpreg.o \ - callback_srm.o srm_puts.o srm_printk.o + callback_srm.o srm_puts.o srm_printk.o \ + fls.o lib-$(CONFIG_SMP) += dec_and_lock.o diff --git a/arch/alpha/lib/fls.c b/arch/alpha/lib/fls.c new file mode 100644 index 00000000000..7ad84ea0acf --- /dev/null +++ b/arch/alpha/lib/fls.c @@ -0,0 +1,38 @@ +/* + * arch/alpha/lib/fls.c + */ + +#include <linux/module.h> +#include <asm/bitops.h> + +/* This is fls(x)-1, except zero is held to zero. This allows most + efficent input into extbl, plus it allows easy handling of fls(0)=0. */ + +const unsigned char __flsm1_tab[256] = +{ + 0, + 0, + 1, 1, + 2, 2, 2, 2, + 3, 3, 3, 3, 3, 3, 3, 3, + 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, + + 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, + 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, + + 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, + 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, + 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, + 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, + + 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, + 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, + 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, + 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, + 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, + 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, + 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, + 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, +}; + +EXPORT_SYMBOL(__flsm1_tab); diff --git a/include/asm-alpha/bitops.h b/include/asm-alpha/bitops.h index 4b6ef7f21b9..3a0cbeb03fa 100644 --- a/include/asm-alpha/bitops.h +++ b/include/asm-alpha/bitops.h @@ -313,32 +313,29 @@ static inline int ffs(int word) * fls: find last bit set. */ #if defined(CONFIG_ALPHA_EV6) && defined(CONFIG_ALPHA_EV67) -static inline int fls(int word) +static inline int fls64(unsigned long word) { - return 64 - __kernel_ctlz(word & 0xffffffff); + return 64 - __kernel_ctlz(word); } #else -#include <asm-generic/bitops/fls.h> -#endif -#include <asm-generic/bitops/fls64.h> +extern const unsigned char __flsm1_tab[256]; -/* Compute powers of two for the given integer. */ -static inline long floor_log2(unsigned long word) +static inline int fls64(unsigned long x) { -#if defined(CONFIG_ALPHA_EV6) && defined(CONFIG_ALPHA_EV67) - return 63 - __kernel_ctlz(word); -#else - long bit; - for (bit = -1; word ; bit++) - word >>= 1; - return bit; -#endif + unsigned long t, a, r; + + t = __kernel_cmpbge (x, 0x0101010101010101); + a = __flsm1_tab[t]; + t = __kernel_extbl (x, a); + r = a*8 + __flsm1_tab[t] + (x != 0); + + return r; } +#endif -static inline long ceil_log2(unsigned long word) +static inline int fls(int x) { - long bit = floor_log2(word); - return bit + (word > (1UL << bit)); + return fls64((unsigned int) x); } /* @@ -353,9 +350,20 @@ static inline unsigned long hweight64(unsigned long w) return __kernel_ctpop(w); } -#define hweight32(x) (unsigned int) hweight64((x) & 0xfffffffful) -#define hweight16(x) (unsigned int) hweight64((x) & 0xfffful) -#define hweight8(x) (unsigned int) hweight64((x) & 0xfful) +static inline unsigned int hweight32(unsigned int w) +{ + return hweight64(w); +} + +static inline unsigned int hweight16(unsigned int w) +{ + return hweight64(w & 0xffff); +} + +static inline unsigned int hweight8(unsigned int w) +{ + return hweight64(w & 0xff); +} #else #include <asm-generic/bitops/hweight.h> #endif |