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author | Linus Torvalds <torvalds@linux-foundation.org> | 2008-10-23 10:22:01 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-10-23 10:22:01 -0700 |
commit | 5b34653963de7a6d0d8c783527457d68fddc60fb (patch) | |
tree | 1a234741e1823a54cd0514616f783b4cf503a528 /include/asm-x86/sync_bitops.h | |
parent | 765426e8ee4c0ab2bc9d44951f4865b8494cdbd0 (diff) | |
parent | 5e1b00758b5a8bee9d42515bffdaf305a32f1b04 (diff) |
Merge branch 'x86/um-header' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'x86/um-header' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (26 commits)
x86: canonicalize remaining header guards
x86: drop double underscores from header guards
x86: Fix ASM_X86__ header guards
x86, um: get rid of uml-config.h
x86, um: get rid of arch/um/Kconfig.arch
x86, um: get rid of arch/um/os symlink
x86, um: get rid of excessive includes of uml-config.h
x86, um: get rid of header symlinks
x86, um: merge Kconfig.i386 and Kconfig.x86_64
x86, um: get rid of sysdep symlink
x86, um: trim the junk from uml ptrace-*.h
x86, um: take vm-flags.h to sysdep
x86, um: get rid of uml asm/arch
x86, um: get rid of uml highmem.h
x86, um: get rid of uml unistd.h
x86, um: get rid of system.h -> system.h include
x86, um: uml atomic.h is not needed anymore
x86, um: untangle uml ldt.h
x86, um: get rid of more uml asm/arch uses
x86, um: remove dead header (uml module-generic.h; never used these days)
...
Diffstat (limited to 'include/asm-x86/sync_bitops.h')
-rw-r--r-- | include/asm-x86/sync_bitops.h | 130 |
1 files changed, 0 insertions, 130 deletions
diff --git a/include/asm-x86/sync_bitops.h b/include/asm-x86/sync_bitops.h deleted file mode 100644 index b689bee7110..00000000000 --- a/include/asm-x86/sync_bitops.h +++ /dev/null @@ -1,130 +0,0 @@ -#ifndef ASM_X86__SYNC_BITOPS_H -#define ASM_X86__SYNC_BITOPS_H - -/* - * Copyright 1992, Linus Torvalds. - */ - -/* - * These have to be done with inline assembly: that way the bit-setting - * is guaranteed to be atomic. All bit operations return 0 if the bit - * was cleared before the operation and != 0 if it was not. - * - * bit 0 is the LSB of addr; bit 32 is the LSB of (addr+1). - */ - -#define ADDR (*(volatile long *)addr) - -/** - * sync_set_bit - Atomically set a bit in memory - * @nr: the bit to set - * @addr: the address to start counting from - * - * This function is atomic and may not be reordered. See __set_bit() - * if you do not require the atomic guarantees. - * - * Note that @nr may be almost arbitrarily large; this function is not - * restricted to acting on a single-word quantity. - */ -static inline void sync_set_bit(int nr, volatile unsigned long *addr) -{ - asm volatile("lock; btsl %1,%0" - : "+m" (ADDR) - : "Ir" (nr) - : "memory"); -} - -/** - * sync_clear_bit - Clears a bit in memory - * @nr: Bit to clear - * @addr: Address to start counting from - * - * sync_clear_bit() is atomic and may not be reordered. However, it does - * not contain a memory barrier, so if it is used for locking purposes, - * you should call smp_mb__before_clear_bit() and/or smp_mb__after_clear_bit() - * in order to ensure changes are visible on other processors. - */ -static inline void sync_clear_bit(int nr, volatile unsigned long *addr) -{ - asm volatile("lock; btrl %1,%0" - : "+m" (ADDR) - : "Ir" (nr) - : "memory"); -} - -/** - * sync_change_bit - Toggle a bit in memory - * @nr: Bit to change - * @addr: Address to start counting from - * - * sync_change_bit() is atomic and may not be reordered. - * Note that @nr may be almost arbitrarily large; this function is not - * restricted to acting on a single-word quantity. - */ -static inline void sync_change_bit(int nr, volatile unsigned long *addr) -{ - asm volatile("lock; btcl %1,%0" - : "+m" (ADDR) - : "Ir" (nr) - : "memory"); -} - -/** - * sync_test_and_set_bit - Set a bit and return its old value - * @nr: Bit to set - * @addr: Address to count from - * - * This operation is atomic and cannot be reordered. - * It also implies a memory barrier. - */ -static inline int sync_test_and_set_bit(int nr, volatile unsigned long *addr) -{ - int oldbit; - - asm volatile("lock; btsl %2,%1\n\tsbbl %0,%0" - : "=r" (oldbit), "+m" (ADDR) - : "Ir" (nr) : "memory"); - return oldbit; -} - -/** - * sync_test_and_clear_bit - Clear a bit and return its old value - * @nr: Bit to clear - * @addr: Address to count from - * - * This operation is atomic and cannot be reordered. - * It also implies a memory barrier. - */ -static inline int sync_test_and_clear_bit(int nr, volatile unsigned long *addr) -{ - int oldbit; - - asm volatile("lock; btrl %2,%1\n\tsbbl %0,%0" - : "=r" (oldbit), "+m" (ADDR) - : "Ir" (nr) : "memory"); - return oldbit; -} - -/** - * sync_test_and_change_bit - Change a bit and return its old value - * @nr: Bit to change - * @addr: Address to count from - * - * This operation is atomic and cannot be reordered. - * It also implies a memory barrier. - */ -static inline int sync_test_and_change_bit(int nr, volatile unsigned long *addr) -{ - int oldbit; - - asm volatile("lock; btcl %2,%1\n\tsbbl %0,%0" - : "=r" (oldbit), "+m" (ADDR) - : "Ir" (nr) : "memory"); - return oldbit; -} - -#define sync_test_bit(nr, addr) test_bit(nr, addr) - -#undef ADDR - -#endif /* ASM_X86__SYNC_BITOPS_H */ |