Implements local64_t. On 64bit, local_t is of size long, and thus we make local64_t an alias. On 32bit, we fall back to atomic64_t. Signed-off-by: Peter Zijlstra Cc: linux-arch@vger.kernel.org LKML-Reference: --- arch/alpha/include/asm/local64.h | 1 arch/arm/include/asm/local64.h | 1 arch/avr32/include/asm/local64.h | 1 arch/blackfin/include/asm/local64.h | 1 arch/cris/include/asm/local64.h | 1 arch/frv/include/asm/local64.h | 1 arch/frv/kernel/local64.h | 1 arch/h8300/include/asm/local64.h | 1 arch/ia64/include/asm/local64.h | 1 arch/m32r/include/asm/local64.h | 1 arch/m68k/include/asm/local64.h | 1 arch/microblaze/include/asm/local64.h | 1 arch/mips/include/asm/local64.h | 1 arch/mn10300/include/asm/local64.h | 1 arch/parisc/include/asm/local64.h | 1 arch/powerpc/include/asm/local64.h | 1 arch/s390/include/asm/local64.h | 1 arch/score/include/asm/local64.h | 1 arch/sh/include/asm/local64.h | 1 arch/sparc/include/asm/local64.h | 1 arch/x86/include/asm/local64.h | 1 arch/xtensa/include/asm/local64.h | 1 include/asm-generic/local64.h | 96 ++++++++++++++++++++++++++++++++++ 23 files changed, 118 insertions(+) Index: linux-2.6/arch/alpha/include/asm/local64.h =================================================================== --- /dev/null +++ linux-2.6/arch/alpha/include/asm/local64.h @@ -0,0 +1 @@ +#include Index: linux-2.6/arch/arm/include/asm/local64.h =================================================================== --- /dev/null +++ linux-2.6/arch/arm/include/asm/local64.h @@ -0,0 +1 @@ +#include Index: linux-2.6/arch/avr32/include/asm/local64.h =================================================================== --- /dev/null +++ linux-2.6/arch/avr32/include/asm/local64.h @@ -0,0 +1 @@ +#include Index: linux-2.6/arch/blackfin/include/asm/local64.h =================================================================== --- /dev/null +++ linux-2.6/arch/blackfin/include/asm/local64.h @@ -0,0 +1 @@ +#include Index: linux-2.6/arch/cris/include/asm/local64.h =================================================================== --- /dev/null +++ linux-2.6/arch/cris/include/asm/local64.h @@ -0,0 +1 @@ +#include Index: linux-2.6/arch/frv/include/asm/local64.h =================================================================== --- /dev/null +++ linux-2.6/arch/frv/include/asm/local64.h @@ -0,0 +1 @@ +#include Index: linux-2.6/arch/frv/kernel/local64.h =================================================================== --- /dev/null +++ linux-2.6/arch/frv/kernel/local64.h @@ -0,0 +1 @@ +#include Index: linux-2.6/arch/h8300/include/asm/local64.h =================================================================== --- /dev/null +++ linux-2.6/arch/h8300/include/asm/local64.h @@ -0,0 +1 @@ +#include Index: linux-2.6/arch/ia64/include/asm/local64.h =================================================================== --- /dev/null +++ linux-2.6/arch/ia64/include/asm/local64.h @@ -0,0 +1 @@ +#include Index: linux-2.6/arch/m32r/include/asm/local64.h =================================================================== --- /dev/null +++ linux-2.6/arch/m32r/include/asm/local64.h @@ -0,0 +1 @@ +#include Index: linux-2.6/arch/m68k/include/asm/local64.h =================================================================== --- /dev/null +++ linux-2.6/arch/m68k/include/asm/local64.h @@ -0,0 +1 @@ +#include Index: linux-2.6/arch/microblaze/include/asm/local64.h =================================================================== --- /dev/null +++ linux-2.6/arch/microblaze/include/asm/local64.h @@ -0,0 +1 @@ +#include Index: linux-2.6/arch/mips/include/asm/local64.h =================================================================== --- /dev/null +++ linux-2.6/arch/mips/include/asm/local64.h @@ -0,0 +1 @@ +#include Index: linux-2.6/arch/mn10300/include/asm/local64.h =================================================================== --- /dev/null +++ linux-2.6/arch/mn10300/include/asm/local64.h @@ -0,0 +1 @@ +#include Index: linux-2.6/arch/parisc/include/asm/local64.h =================================================================== --- /dev/null +++ linux-2.6/arch/parisc/include/asm/local64.h @@ -0,0 +1 @@ +#include Index: linux-2.6/arch/powerpc/include/asm/local64.h =================================================================== --- /dev/null +++ linux-2.6/arch/powerpc/include/asm/local64.h @@ -0,0 +1 @@ +#include Index: linux-2.6/arch/s390/include/asm/local64.h =================================================================== --- /dev/null +++ linux-2.6/arch/s390/include/asm/local64.h @@ -0,0 +1 @@ +#include Index: linux-2.6/arch/score/include/asm/local64.h =================================================================== --- /dev/null +++ linux-2.6/arch/score/include/asm/local64.h @@ -0,0 +1 @@ +#include Index: linux-2.6/arch/sh/include/asm/local64.h =================================================================== --- /dev/null +++ linux-2.6/arch/sh/include/asm/local64.h @@ -0,0 +1 @@ +#include Index: linux-2.6/arch/sparc/include/asm/local64.h =================================================================== --- /dev/null +++ linux-2.6/arch/sparc/include/asm/local64.h @@ -0,0 +1 @@ +#include Index: linux-2.6/arch/x86/include/asm/local64.h =================================================================== --- /dev/null +++ linux-2.6/arch/x86/include/asm/local64.h @@ -0,0 +1 @@ +#include Index: linux-2.6/arch/xtensa/include/asm/local64.h =================================================================== --- /dev/null +++ linux-2.6/arch/xtensa/include/asm/local64.h @@ -0,0 +1 @@ +#include Index: linux-2.6/include/asm-generic/local64.h =================================================================== --- /dev/null +++ linux-2.6/include/asm-generic/local64.h @@ -0,0 +1,96 @@ +#ifndef _ASM_GENERIC_LOCAL64_H +#define _ASM_GENERIC_LOCAL64_H + +#include +#include + +/* + * A signed long type for operations which are atomic for a single CPU. + * Usually used in combination with per-cpu variables. + * + * This is the default implementation, which uses atomic64_t. Which is + * rather pointless. The whole point behind local64_t is that some processors + * can perform atomic adds and subtracts in a manner which is atomic wrt IRQs + * running on this CPU. local64_t allows exploitation of such capabilities. + */ + +/* Implement in terms of atomics. */ + +#if BITS_PER_LONG == 64 + +#include + +typedef struct { + local_t a; +} local64_t; + +#define LOCAL64_INIT(i) { LOCAL_INIT(i) } + +#define local64_read(l) local_read(&(l)->a) +#define local64_set(l,i) local_set((&(l)->a),(i)) +#define local64_inc(l) local_inc(&(l)->a) +#define local64_dec(l) local_dec(&(l)->a) +#define local64_add(i,l) local_add((i),(&(l)->a)) +#define local64_sub(i,l) local_sub((i),(&(l)->a)) + +#define local64_sub_and_test(i, l) local_sub_and_test((i), (&(l)->a)) +#define local64_dec_and_test(l) local_dec_and_test(&(l)->a) +#define local64_inc_and_test(l) local_inc_and_test(&(l)->a) +#define local64_add_negative(i, l) local_add_negative((i), (&(l)->a)) +#define local64_add_return(i, l) local_add_return((i), (&(l)->a)) +#define local64_sub_return(i, l) local_sub_return((i), (&(l)->a)) +#define local64_inc_return(l) local_inc_return(&(l)->a) + +#define local64_cmpxchg(l, o, n) local_cmpxchg((&(l)->a), (o), (n)) +#define local64_xchg(l, n) local_xchg((&(l)->a), (n)) +#define local64_add_unless(l, _a, u) local_add_unless((&(l)->a), (_a), (u)) +#define local64_inc_not_zero(l) local_inc_not_zero(&(l)->a) + +/* Non-atomic variants, ie. preemption disabled and won't be touched + * in interrupt, etc. Some archs can optimize this case well. */ +#define __local64_inc(l) local64_set((l), local64_read(l) + 1) +#define __local64_dec(l) local64_set((l), local64_read(l) - 1) +#define __local64_add(i,l) local64_set((l), local64_read(l) + (i)) +#define __local64_sub(i,l) local64_set((l), local64_read(l) - (i)) + +#else /* BITS_PER_LONG != 64 */ + +#include + +/* Don't use typedef: don't want them to be mixed with atomic_t's. */ +typedef struct { + atomic64_t a; +} local64_t; + +#define LOCAL64_INIT(i) { ATOMIC_LONG_INIT(i) } + +#define local64_read(l) atomic64_read(&(l)->a) +#define local64_set(l,i) atomic64_set((&(l)->a),(i)) +#define local64_inc(l) atomic64_inc(&(l)->a) +#define local64_dec(l) atomic64_dec(&(l)->a) +#define local64_add(i,l) atomic64_add((i),(&(l)->a)) +#define local64_sub(i,l) atomic64_sub((i),(&(l)->a)) + +#define local64_sub_and_test(i, l) atomic64_sub_and_test((i), (&(l)->a)) +#define local64_dec_and_test(l) atomic64_dec_and_test(&(l)->a) +#define local64_inc_and_test(l) atomic64_inc_and_test(&(l)->a) +#define local64_add_negative(i, l) atomic64_add_negative((i), (&(l)->a)) +#define local64_add_return(i, l) atomic64_add_return((i), (&(l)->a)) +#define local64_sub_return(i, l) atomic64_sub_return((i), (&(l)->a)) +#define local64_inc_return(l) atomic64_inc_return(&(l)->a) + +#define local64_cmpxchg(l, o, n) atomic64_cmpxchg((&(l)->a), (o), (n)) +#define local64_xchg(l, n) atomic64_xchg((&(l)->a), (n)) +#define local64_add_unless(l, _a, u) atomic64_add_unless((&(l)->a), (_a), (u)) +#define local64_inc_not_zero(l) atomic64_inc_not_zero(&(l)->a) + +/* Non-atomic variants, ie. preemption disabled and won't be touched + * in interrupt, etc. Some archs can optimize this case well. */ +#define __local64_inc(l) local64_set((l), local64_read(l) + 1) +#define __local64_dec(l) local64_set((l), local64_read(l) - 1) +#define __local64_add(i,l) local64_set((l), local64_read(l) + (i)) +#define __local64_sub(i,l) local64_set((l), local64_read(l) - (i)) + +#endif /* BITS_PER_LONG != 64 */ + +#endif /* _ASM_GENERIC_LOCAL64_H */ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/