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authorAlexander van Heukelum <heukelum@mailshack.com>2008-04-01 17:47:57 +0200
committerIngo Molnar <mingo@elte.hu>2008-04-26 19:21:17 +0200
commit5245698f665c4b7a533dcc47a5afdf33095d436a (patch)
tree5e417154f181e523c8491ec263eb71fbaf8ec0da /arch/x86/lib/bitops_64.c
parentx86: optimize find_first_bit for small bitmaps (diff)
downloadlinux-dev-5245698f665c4b7a533dcc47a5afdf33095d436a.tar.xz
linux-dev-5245698f665c4b7a533dcc47a5afdf33095d436a.zip
x86, UML: remove x86-specific implementations of find_first_bit
x86 has been switched to the generic versions of find_first_bit and find_first_zero_bit, but the original versions were retained. This patch just removes the now unused x86-specific versions. also update UML. Signed-off-by: Alexander van Heukelum <heukelum@fastmail.fm> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to '')
-rw-r--r--arch/x86/lib/bitops_64.c109
1 files changed, 0 insertions, 109 deletions
diff --git a/arch/x86/lib/bitops_64.c b/arch/x86/lib/bitops_64.c
deleted file mode 100644
index 568467d390c0..000000000000
--- a/arch/x86/lib/bitops_64.c
+++ /dev/null
@@ -1,109 +0,0 @@
-#ifndef CONFIG_GENERIC_FIND_FIRST_BIT
-#include <linux/bitops.h>
-
-#undef find_first_zero_bit
-#undef find_first_bit
-
-static inline long
-__find_first_zero_bit(const unsigned long * addr, unsigned long size)
-{
- long d0, d1, d2;
- long res;
-
- /*
- * We must test the size in words, not in bits, because
- * otherwise incoming sizes in the range -63..-1 will not run
- * any scasq instructions, and then the flags used by the je
- * instruction will have whatever random value was in place
- * before. Nobody should call us like that, but
- * find_next_zero_bit() does when offset and size are at the
- * same word and it fails to find a zero itself.
- */
- size += 63;
- size >>= 6;
- if (!size)
- return 0;
- asm volatile(
- " repe; scasq\n"
- " je 1f\n"
- " xorq -8(%%rdi),%%rax\n"
- " subq $8,%%rdi\n"
- " bsfq %%rax,%%rdx\n"
- "1: subq %[addr],%%rdi\n"
- " shlq $3,%%rdi\n"
- " addq %%rdi,%%rdx"
- :"=d" (res), "=&c" (d0), "=&D" (d1), "=&a" (d2)
- :"0" (0ULL), "1" (size), "2" (addr), "3" (-1ULL),
- [addr] "S" (addr) : "memory");
- /*
- * Any register would do for [addr] above, but GCC tends to
- * prefer rbx over rsi, even though rsi is readily available
- * and doesn't have to be saved.
- */
- return res;
-}
-
-/**
- * find_first_zero_bit - find the first zero bit in a memory region
- * @addr: The address to start the search at
- * @size: The maximum size to search
- *
- * Returns the bit-number of the first zero bit, not the number of the byte
- * containing a bit.
- */
-long find_first_zero_bit(const unsigned long * addr, unsigned long size)
-{
- return __find_first_zero_bit (addr, size);
-}
-
-static inline long
-__find_first_bit(const unsigned long * addr, unsigned long size)
-{
- long d0, d1;
- long res;
-
- /*
- * We must test the size in words, not in bits, because
- * otherwise incoming sizes in the range -63..-1 will not run
- * any scasq instructions, and then the flags used by the jz
- * instruction will have whatever random value was in place
- * before. Nobody should call us like that, but
- * find_next_bit() does when offset and size are at the same
- * word and it fails to find a one itself.
- */
- size += 63;
- size >>= 6;
- if (!size)
- return 0;
- asm volatile(
- " repe; scasq\n"
- " jz 1f\n"
- " subq $8,%%rdi\n"
- " bsfq (%%rdi),%%rax\n"
- "1: subq %[addr],%%rdi\n"
- " shlq $3,%%rdi\n"
- " addq %%rdi,%%rax"
- :"=a" (res), "=&c" (d0), "=&D" (d1)
- :"0" (0ULL), "1" (size), "2" (addr),
- [addr] "r" (addr) : "memory");
- return res;
-}
-
-/**
- * find_first_bit - find the first set bit in a memory region
- * @addr: The address to start the search at
- * @size: The maximum size to search
- *
- * Returns the bit-number of the first set bit, not the number of the byte
- * containing a bit.
- */
-long find_first_bit(const unsigned long * addr, unsigned long size)
-{
- return __find_first_bit(addr,size);
-}
-
-#include <linux/module.h>
-
-EXPORT_SYMBOL(find_first_bit);
-EXPORT_SYMBOL(find_first_zero_bit);
-#endif