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Message-ID: <20131104205443.GX3947@linux.vnet.ibm.com>
Date: Mon, 4 Nov 2013 12:54:43 -0800
From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
Victor Kaplansky <VICTORK@...ibm.com>,
Oleg Nesterov <oleg@...hat.com>,
Anton Blanchard <anton@...ba.org>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Frederic Weisbecker <fweisbec@...il.com>,
LKML <linux-kernel@...r.kernel.org>,
Linux PPC dev <linuxppc-dev@...abs.org>,
Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
Michael Ellerman <michael@...erman.id.au>,
Michael Neuling <mikey@...ling.org>
Subject: Re: [RFC] arch: Introduce new TSO memory barrier smp_tmb()
On Mon, Nov 04, 2013 at 08:18:11PM +0100, Peter Zijlstra wrote:
> On Mon, Nov 04, 2013 at 08:11:27PM +0100, Peter Zijlstra wrote:
> > +#define smp_load_acquire(p, v) \
>
> I R idiot!! :-)
OK, I did miss this one as well... :-/
Thanx, Paul
> ---
> arch/alpha/include/asm/barrier.h | 13 +++++++++++
> arch/arc/include/asm/barrier.h | 13 +++++++++++
> arch/arm/include/asm/barrier.h | 26 +++++++++++++++++++++
> arch/arm64/include/asm/barrier.h | 28 +++++++++++++++++++++++
> arch/avr32/include/asm/barrier.h | 12 ++++++++++
> arch/blackfin/include/asm/barrier.h | 13 +++++++++++
> arch/cris/include/asm/barrier.h | 13 +++++++++++
> arch/frv/include/asm/barrier.h | 13 +++++++++++
> arch/h8300/include/asm/barrier.h | 13 +++++++++++
> arch/hexagon/include/asm/barrier.h | 13 +++++++++++
> arch/ia64/include/asm/barrier.h | 43 +++++++++++++++++++++++++++++++++++
> arch/m32r/include/asm/barrier.h | 13 +++++++++++
> arch/m68k/include/asm/barrier.h | 13 +++++++++++
> arch/metag/include/asm/barrier.h | 13 +++++++++++
> arch/microblaze/include/asm/barrier.h | 13 +++++++++++
> arch/mips/include/asm/barrier.h | 13 +++++++++++
> arch/mn10300/include/asm/barrier.h | 13 +++++++++++
> arch/parisc/include/asm/barrier.h | 13 +++++++++++
> arch/powerpc/include/asm/barrier.h | 15 ++++++++++++
> arch/s390/include/asm/barrier.h | 13 +++++++++++
> arch/score/include/asm/barrier.h | 13 +++++++++++
> arch/sh/include/asm/barrier.h | 13 +++++++++++
> arch/sparc/include/asm/barrier_32.h | 13 +++++++++++
> arch/sparc/include/asm/barrier_64.h | 13 +++++++++++
> arch/tile/include/asm/barrier.h | 13 +++++++++++
> arch/unicore32/include/asm/barrier.h | 13 +++++++++++
> arch/x86/include/asm/barrier.h | 13 +++++++++++
> arch/xtensa/include/asm/barrier.h | 13 +++++++++++
> 28 files changed, 423 insertions(+)
>
> diff --git a/arch/alpha/include/asm/barrier.h b/arch/alpha/include/asm/barrier.h
> index ce8860a0b32d..464139feee97 100644
> --- a/arch/alpha/include/asm/barrier.h
> +++ b/arch/alpha/include/asm/barrier.h
> @@ -29,6 +29,19 @@ __asm__ __volatile__("mb": : :"memory")
> #define smp_read_barrier_depends() do { } while (0)
> #endif
>
> +#define smp_store_release(p, v) \
> +do { \
> + smp_mb(); \
> + ACCESS_ONCE(p) = (v); \
> +} while (0)
> +
> +#define smp_load_acquire(p) \
> +do { \
> + typeof(p) ___p1 = ACCESS_ONCE(p); \
> + smp_mb(); \
> + return ___p1; \
> +} while (0)
> +
> #define set_mb(var, value) \
> do { var = value; mb(); } while (0)
>
> diff --git a/arch/arc/include/asm/barrier.h b/arch/arc/include/asm/barrier.h
> index f6cb7c4ffb35..a779da846fb5 100644
> --- a/arch/arc/include/asm/barrier.h
> +++ b/arch/arc/include/asm/barrier.h
> @@ -30,6 +30,19 @@
> #define smp_wmb() barrier()
> #endif
>
> +#define smp_store_release(p, v) \
> +do { \
> + smp_mb(); \
> + ACCESS_ONCE(p) = (v); \
> +} while (0)
> +
> +#define smp_load_acquire(p) \
> +do { \
> + typeof(p) ___p1 = ACCESS_ONCE(p); \
> + smp_mb(); \
> + return ___p1; \
> +} while (0)
> +
> #define smp_mb__before_atomic_dec() barrier()
> #define smp_mb__after_atomic_dec() barrier()
> #define smp_mb__before_atomic_inc() barrier()
> diff --git a/arch/arm/include/asm/barrier.h b/arch/arm/include/asm/barrier.h
> index 60f15e274e6d..4ada4720bdeb 100644
> --- a/arch/arm/include/asm/barrier.h
> +++ b/arch/arm/include/asm/barrier.h
> @@ -53,10 +53,36 @@
> #define smp_mb() barrier()
> #define smp_rmb() barrier()
> #define smp_wmb() barrier()
> +
> +#define smp_store_release(p, v) \
> +do { \
> + smp_mb(); \
> + ACCESS_ONCE(p) = (v); \
> +} while (0)
> +
> +#define smp_load_acquire(p) \
> +do { \
> + typeof(p) ___p1 = ACCESS_ONCE(p); \
> + smp_mb(); \
> + return ___p1; \
> +} while (0)
> #else
> #define smp_mb() dmb(ish)
> #define smp_rmb() smp_mb()
> #define smp_wmb() dmb(ishst)
> +
> +#define smp_store_release(p, v) \
> +do { \
> + asm volatile ("stlr %w0 [%1]" : : "r" (v), "r" (&p) : "memory");\
> +} while (0)
> +
> +#define smp_load_acquire(p) \
> +do { \
> + typeof(p) ___p1; \
> + asm volatile ("ldar %w0, [%1]" \
> + : "=r" (___p1) : "r" (&p) : "memory"); \
> + return ___p1; \
> +} while (0)
> #endif
>
> #define read_barrier_depends() do { } while(0)
> diff --git a/arch/arm64/include/asm/barrier.h b/arch/arm64/include/asm/barrier.h
> index d4a63338a53c..3dfddc0416f6 100644
> --- a/arch/arm64/include/asm/barrier.h
> +++ b/arch/arm64/include/asm/barrier.h
> @@ -35,10 +35,38 @@
> #define smp_mb() barrier()
> #define smp_rmb() barrier()
> #define smp_wmb() barrier()
> +
> +#define smp_store_release(p, v) \
> +do { \
> + smp_mb(); \
> + ACCESS_ONCE(p) = (v); \
> +} while (0)
> +
> +#define smp_load_acquire(p) \
> +do { \
> + typeof(p) ___p1 = ACCESS_ONCE(p); \
> + smp_mb(); \
> + return ___p1; \
> +} while (0)
> +
> #else
> +
> #define smp_mb() asm volatile("dmb ish" : : : "memory")
> #define smp_rmb() asm volatile("dmb ishld" : : : "memory")
> #define smp_wmb() asm volatile("dmb ishst" : : : "memory")
> +
> +#define smp_store_release(p, v) \
> +do { \
> + asm volatile ("stlr %w0 [%1]" : : "r" (v), "r" (&p) : "memory");\
> +} while (0)
> +
> +#define smp_load_acquire(p) \
> +do { \
> + typeof(p) ___p1; \
> + asm volatile ("ldar %w0, [%1]" \
> + : "=r" (___p1) : "r" (&p) : "memory"); \
> + return ___p1; \
> +} while (0)
> #endif
>
> #define read_barrier_depends() do { } while(0)
> diff --git a/arch/avr32/include/asm/barrier.h b/arch/avr32/include/asm/barrier.h
> index 0961275373db..8fd164648e71 100644
> --- a/arch/avr32/include/asm/barrier.h
> +++ b/arch/avr32/include/asm/barrier.h
> @@ -25,5 +25,17 @@
> # define smp_read_barrier_depends() do { } while(0)
> #endif
>
> +#define smp_store_release(p, v) \
> +do { \
> + smp_mb(); \
> + ACCESS_ONCE(p) = (v); \
> +} while (0)
> +
> +#define smp_load_acquire(p) \
> +do { \
> + typeof(p) ___p1 = ACCESS_ONCE(p); \
> + smp_mb(); \
> + return ___p1; \
> +} while (0)
>
> #endif /* __ASM_AVR32_BARRIER_H */
> diff --git a/arch/blackfin/include/asm/barrier.h b/arch/blackfin/include/asm/barrier.h
> index ebb189507dd7..c8b85bba843f 100644
> --- a/arch/blackfin/include/asm/barrier.h
> +++ b/arch/blackfin/include/asm/barrier.h
> @@ -45,4 +45,17 @@
> #define set_mb(var, value) do { var = value; mb(); } while (0)
> #define smp_read_barrier_depends() read_barrier_depends()
>
> +#define smp_store_release(p, v) \
> +do { \
> + smp_mb(); \
> + ACCESS_ONCE(p) = (v); \
> +} while (0)
> +
> +#define smp_load_acquire(p) \
> +do { \
> + typeof(p) ___p1 = ACCESS_ONCE(p); \
> + smp_mb(); \
> + return ___p1; \
> +} while (0)
> +
> #endif /* _BLACKFIN_BARRIER_H */
> diff --git a/arch/cris/include/asm/barrier.h b/arch/cris/include/asm/barrier.h
> index 198ad7fa6b25..26f21f5d1d15 100644
> --- a/arch/cris/include/asm/barrier.h
> +++ b/arch/cris/include/asm/barrier.h
> @@ -22,4 +22,17 @@
> #define smp_read_barrier_depends() do { } while(0)
> #endif
>
> +#define smp_store_release(p, v) \
> +do { \
> + smp_mb(); \
> + ACCESS_ONCE(p) = (v); \
> +} while (0)
> +
> +#define smp_load_acquire(p) \
> +do { \
> + typeof(p) ___p1 = ACCESS_ONCE(p); \
> + smp_mb(); \
> + return ___p1; \
> +} while (0)
> +
> #endif /* __ASM_CRIS_BARRIER_H */
> diff --git a/arch/frv/include/asm/barrier.h b/arch/frv/include/asm/barrier.h
> index 06776ad9f5e9..4569028382fa 100644
> --- a/arch/frv/include/asm/barrier.h
> +++ b/arch/frv/include/asm/barrier.h
> @@ -26,4 +26,17 @@
> #define set_mb(var, value) \
> do { var = (value); barrier(); } while (0)
>
> +#define smp_store_release(p, v) \
> +do { \
> + smp_mb(); \
> + ACCESS_ONCE(p) = (v); \
> +} while (0)
> +
> +#define smp_load_acquire(p) \
> +do { \
> + typeof(p) ___p1 = ACCESS_ONCE(p); \
> + smp_mb(); \
> + return ___p1; \
> +} while (0)
> +
> #endif /* _ASM_BARRIER_H */
> diff --git a/arch/h8300/include/asm/barrier.h b/arch/h8300/include/asm/barrier.h
> index 9e0aa9fc195d..45d36738814d 100644
> --- a/arch/h8300/include/asm/barrier.h
> +++ b/arch/h8300/include/asm/barrier.h
> @@ -26,4 +26,17 @@
> #define smp_read_barrier_depends() do { } while(0)
> #endif
>
> +#define smp_store_release(p, v) \
> +do { \
> + smp_mb(); \
> + ACCESS_ONCE(p) = (v); \
> +} while (0)
> +
> +#define smp_load_acquire(p) \
> +do { \
> + typeof(p) ___p1 = ACCESS_ONCE(p); \
> + smp_mb(); \
> + return ___p1; \
> +} while (0)
> +
> #endif /* _H8300_BARRIER_H */
> diff --git a/arch/hexagon/include/asm/barrier.h b/arch/hexagon/include/asm/barrier.h
> index 1041a8e70ce8..d88d54bd2e6e 100644
> --- a/arch/hexagon/include/asm/barrier.h
> +++ b/arch/hexagon/include/asm/barrier.h
> @@ -38,4 +38,17 @@
> #define set_mb(var, value) \
> do { var = value; mb(); } while (0)
>
> +#define smp_store_release(p, v) \
> +do { \
> + smp_mb(); \
> + ACCESS_ONCE(p) = (v); \
> +} while (0)
> +
> +#define smp_load_acquire(p) \
> +do { \
> + typeof(p) ___p1 = ACCESS_ONCE(p); \
> + smp_mb(); \
> + return ___p1; \
> +} while (0)
> +
> #endif /* _ASM_BARRIER_H */
> diff --git a/arch/ia64/include/asm/barrier.h b/arch/ia64/include/asm/barrier.h
> index 60576e06b6fb..b7f1a8aa03af 100644
> --- a/arch/ia64/include/asm/barrier.h
> +++ b/arch/ia64/include/asm/barrier.h
> @@ -45,11 +45,54 @@
> # define smp_rmb() rmb()
> # define smp_wmb() wmb()
> # define smp_read_barrier_depends() read_barrier_depends()
> +
> +#define smp_store_release(p, v) \
> +do { \
> + switch (sizeof(p)) { \
> + case 4: \
> + asm volatile ("st4.acq [%0]=%1" \
> + :: "r" (&p), "r" (v) : "memory"); \
> + break; \
> + case 8: \
> + asm volatile ("st8.acq [%0]=%1" \
> + :: "r" (&p), "r" (v) : "memory"); \
> + break; \
> + } \
> +} while (0)
> +
> +#define smp_load_acquire(p) \
> +do { \
> + typeof(p) ___p1; \
> + switch (sizeof(p)) { \
> + case 4: \
> + asm volatile ("ld4.rel %0=[%1]" \
> + : "=r"(___p1) : "r" (&p) : "memory"); \
> + break; \
> + case 8: \
> + asm volatile ("ld8.rel %0=[%1]" \
> + : "=r"(___p1) : "r" (&p) : "memory"); \
> + break; \
> + } \
> + return ___p1; \
> +} while (0)
> #else
> # define smp_mb() barrier()
> # define smp_rmb() barrier()
> # define smp_wmb() barrier()
> # define smp_read_barrier_depends() do { } while(0)
> +
> +#define smp_store_release(p, v) \
> +do { \
> + smp_mb(); \
> + ACCESS_ONCE(p) = (v); \
> +} while (0)
> +
> +#define smp_load_acquire(p) \
> +do { \
> + typeof(p) ___p1 = ACCESS_ONCE(p); \
> + smp_mb(); \
> + return ___p1; \
> +} while (0)
> #endif
>
> /*
> diff --git a/arch/m32r/include/asm/barrier.h b/arch/m32r/include/asm/barrier.h
> index 6976621efd3f..d78612289cb2 100644
> --- a/arch/m32r/include/asm/barrier.h
> +++ b/arch/m32r/include/asm/barrier.h
> @@ -91,4 +91,17 @@
> #define set_mb(var, value) do { var = value; barrier(); } while (0)
> #endif
>
> +#define smp_store_release(p, v) \
> +do { \
> + smp_mb(); \
> + ACCESS_ONCE(p) = (v); \
> +} while (0)
> +
> +#define smp_load_acquire(p) \
> +do { \
> + typeof(p) ___p1 = ACCESS_ONCE(p); \
> + smp_mb(); \
> + return ___p1; \
> +} while (0)
> +
> #endif /* _ASM_M32R_BARRIER_H */
> diff --git a/arch/m68k/include/asm/barrier.h b/arch/m68k/include/asm/barrier.h
> index 445ce22c23cb..1e63b11c424c 100644
> --- a/arch/m68k/include/asm/barrier.h
> +++ b/arch/m68k/include/asm/barrier.h
> @@ -17,4 +17,17 @@
> #define smp_wmb() barrier()
> #define smp_read_barrier_depends() ((void)0)
>
> +#define smp_store_release(p, v) \
> +do { \
> + smp_mb(); \
> + ACCESS_ONCE(p) = (v); \
> +} while (0)
> +
> +#define smp_load_acquire(p) \
> +do { \
> + typeof(p) ___p1 = ACCESS_ONCE(p); \
> + smp_mb(); \
> + return ___p1; \
> +} while (0)
> +
> #endif /* _M68K_BARRIER_H */
> diff --git a/arch/metag/include/asm/barrier.h b/arch/metag/include/asm/barrier.h
> index c90bfc6bf648..9ffd0b167f07 100644
> --- a/arch/metag/include/asm/barrier.h
> +++ b/arch/metag/include/asm/barrier.h
> @@ -82,4 +82,17 @@ static inline void fence(void)
> #define smp_read_barrier_depends() do { } while (0)
> #define set_mb(var, value) do { var = value; smp_mb(); } while (0)
>
> +#define smp_store_release(p, v) \
> +do { \
> + smp_mb(); \
> + ACCESS_ONCE(p) = (v); \
> +} while (0)
> +
> +#define smp_load_acquire(p) \
> +do { \
> + typeof(p) ___p1 = ACCESS_ONCE(p); \
> + smp_mb(); \
> + return ___p1; \
> +} while (0)
> +
> #endif /* _ASM_METAG_BARRIER_H */
> diff --git a/arch/microblaze/include/asm/barrier.h b/arch/microblaze/include/asm/barrier.h
> index df5be3e87044..db0b5e205ce3 100644
> --- a/arch/microblaze/include/asm/barrier.h
> +++ b/arch/microblaze/include/asm/barrier.h
> @@ -24,4 +24,17 @@
> #define smp_rmb() rmb()
> #define smp_wmb() wmb()
>
> +#define smp_store_release(p, v) \
> +do { \
> + smp_mb(); \
> + ACCESS_ONCE(p) = (v); \
> +} while (0)
> +
> +#define smp_load_acquire(p) \
> +do { \
> + typeof(p) ___p1 = ACCESS_ONCE(p); \
> + smp_mb(); \
> + return ___p1; \
> +} while (0)
> +
> #endif /* _ASM_MICROBLAZE_BARRIER_H */
> diff --git a/arch/mips/include/asm/barrier.h b/arch/mips/include/asm/barrier.h
> index 314ab5532019..8031afcc7f64 100644
> --- a/arch/mips/include/asm/barrier.h
> +++ b/arch/mips/include/asm/barrier.h
> @@ -180,4 +180,17 @@
> #define nudge_writes() mb()
> #endif
>
> +#define smp_store_release(p, v) \
> +do { \
> + smp_mb(); \
> + ACCESS_ONCE(p) = (v); \
> +} while (0)
> +
> +#define smp_load_acquire(p) \
> +do { \
> + typeof(p) ___p1 = ACCESS_ONCE(p); \
> + smp_mb(); \
> + return ___p1; \
> +} while (0)
> +
> #endif /* __ASM_BARRIER_H */
> diff --git a/arch/mn10300/include/asm/barrier.h b/arch/mn10300/include/asm/barrier.h
> index 2bd97a5c8af7..e822ff76f498 100644
> --- a/arch/mn10300/include/asm/barrier.h
> +++ b/arch/mn10300/include/asm/barrier.h
> @@ -34,4 +34,17 @@
> #define read_barrier_depends() do {} while (0)
> #define smp_read_barrier_depends() do {} while (0)
>
> +#define smp_store_release(p, v) \
> +do { \
> + smp_mb(); \
> + ACCESS_ONCE(p) = (v); \
> +} while (0)
> +
> +#define smp_load_acquire(p) \
> +do { \
> + typeof(p) ___p1 = ACCESS_ONCE(p); \
> + smp_mb(); \
> + return ___p1; \
> +} while (0)
> +
> #endif /* _ASM_BARRIER_H */
> diff --git a/arch/parisc/include/asm/barrier.h b/arch/parisc/include/asm/barrier.h
> index e77d834aa803..58757747f873 100644
> --- a/arch/parisc/include/asm/barrier.h
> +++ b/arch/parisc/include/asm/barrier.h
> @@ -32,4 +32,17 @@
>
> #define set_mb(var, value) do { var = value; mb(); } while (0)
>
> +#define smp_store_release(p, v) \
> +do { \
> + smp_mb(); \
> + ACCESS_ONCE(p) = (v); \
> +} while (0)
> +
> +#define smp_load_acquire(p) \
> +do { \
> + typeof(p) ___p1 = ACCESS_ONCE(p); \
> + smp_mb(); \
> + return ___p1; \
> +} while (0)
> +
> #endif /* __PARISC_BARRIER_H */
> diff --git a/arch/powerpc/include/asm/barrier.h b/arch/powerpc/include/asm/barrier.h
> index ae782254e731..54922626b356 100644
> --- a/arch/powerpc/include/asm/barrier.h
> +++ b/arch/powerpc/include/asm/barrier.h
> @@ -65,4 +65,19 @@
> #define data_barrier(x) \
> asm volatile("twi 0,%0,0; isync" : : "r" (x) : "memory");
>
> +/* use smp_rmb() as that is either lwsync or a barrier() depending on SMP */
> +
> +#define smp_store_release(p, v) \
> +do { \
> + smp_rmb(); \
> + ACCESS_ONCE(p) = (v); \
> +} while (0)
> +
> +#define smp_load_acquire(p) \
> +do { \
> + typeof(p) ___p1 = ACCESS_ONCE(p); \
> + smp_rmb(); \
> + return ___p1; \
> +} while (0)
> +
> #endif /* _ASM_POWERPC_BARRIER_H */
> diff --git a/arch/s390/include/asm/barrier.h b/arch/s390/include/asm/barrier.h
> index 16760eeb79b0..babf928649a4 100644
> --- a/arch/s390/include/asm/barrier.h
> +++ b/arch/s390/include/asm/barrier.h
> @@ -32,4 +32,17 @@
>
> #define set_mb(var, value) do { var = value; mb(); } while (0)
>
> +#define smp_store_release(p, v) \
> +do { \
> + barrier(); \
> + ACCESS_ONCE(p) = (v); \
> +} while (0)
> +
> +#define smp_load_acquire(p) \
> +do { \
> + typeof(p) ___p1 = ACCESS_ONCE(p); \
> + barrier(); \
> + return ___p1; \
> +} while (0)
> +
> #endif /* __ASM_BARRIER_H */
> diff --git a/arch/score/include/asm/barrier.h b/arch/score/include/asm/barrier.h
> index 0eacb6471e6d..5905ea57a104 100644
> --- a/arch/score/include/asm/barrier.h
> +++ b/arch/score/include/asm/barrier.h
> @@ -13,4 +13,17 @@
>
> #define set_mb(var, value) do {var = value; wmb(); } while (0)
>
> +#define smp_store_release(p, v) \
> +do { \
> + smp_mb(); \
> + ACCESS_ONCE(p) = (v); \
> +} while (0)
> +
> +#define smp_load_acquire(p) \
> +do { \
> + typeof(p) ___p1 = ACCESS_ONCE(p); \
> + smp_mb(); \
> + return ___p1; \
> +} while (0)
> +
> #endif /* _ASM_SCORE_BARRIER_H */
> diff --git a/arch/sh/include/asm/barrier.h b/arch/sh/include/asm/barrier.h
> index 72c103dae300..379f500023b6 100644
> --- a/arch/sh/include/asm/barrier.h
> +++ b/arch/sh/include/asm/barrier.h
> @@ -51,4 +51,17 @@
>
> #define set_mb(var, value) do { (void)xchg(&var, value); } while (0)
>
> +#define smp_store_release(p, v) \
> +do { \
> + smp_mb(); \
> + ACCESS_ONCE(p) = (v); \
> +} while (0)
> +
> +#define smp_load_acquire(p) \
> +do { \
> + typeof(p) ___p1 = ACCESS_ONCE(p); \
> + smp_mb(); \
> + return ___p1; \
> +} while (0)
> +
> #endif /* __ASM_SH_BARRIER_H */
> diff --git a/arch/sparc/include/asm/barrier_32.h b/arch/sparc/include/asm/barrier_32.h
> index c1b76654ee76..1649081d1b86 100644
> --- a/arch/sparc/include/asm/barrier_32.h
> +++ b/arch/sparc/include/asm/barrier_32.h
> @@ -12,4 +12,17 @@
> #define smp_wmb() __asm__ __volatile__("":::"memory")
> #define smp_read_barrier_depends() do { } while(0)
>
> +#define smp_store_release(p, v) \
> +do { \
> + smp_mb(); \
> + ACCESS_ONCE(p) = (v); \
> +} while (0)
> +
> +#define smp_load_acquire(p) \
> +do { \
> + typeof(p) ___p1 = ACCESS_ONCE(p); \
> + smp_mb(); \
> + return ___p1; \
> +} while (0)
> +
> #endif /* !(__SPARC_BARRIER_H) */
> diff --git a/arch/sparc/include/asm/barrier_64.h b/arch/sparc/include/asm/barrier_64.h
> index 95d45986f908..5e23ced0a29a 100644
> --- a/arch/sparc/include/asm/barrier_64.h
> +++ b/arch/sparc/include/asm/barrier_64.h
> @@ -53,4 +53,17 @@ do { __asm__ __volatile__("ba,pt %%xcc, 1f\n\t" \
>
> #define smp_read_barrier_depends() do { } while(0)
>
> +#define smp_store_release(p, v) \
> +do { \
> + barrier(); \
> + ACCESS_ONCE(p) = (v); \
> +} while (0)
> +
> +#define smp_load_acquire(p) \
> +do { \
> + typeof(p) ___p1 = ACCESS_ONCE(p); \
> + barrier(); \
> + return ___p1; \
> +} while (0)
> +
> #endif /* !(__SPARC64_BARRIER_H) */
> diff --git a/arch/tile/include/asm/barrier.h b/arch/tile/include/asm/barrier.h
> index a9a73da5865d..1f08318db3c0 100644
> --- a/arch/tile/include/asm/barrier.h
> +++ b/arch/tile/include/asm/barrier.h
> @@ -140,5 +140,18 @@ mb_incoherent(void)
> #define set_mb(var, value) \
> do { var = value; mb(); } while (0)
>
> +#define smp_store_release(p, v) \
> +do { \
> + smp_mb(); \
> + ACCESS_ONCE(p) = (v); \
> +} while (0)
> +
> +#define smp_load_acquire(p) \
> +do { \
> + typeof(p) ___p1 = ACCESS_ONCE(p); \
> + smp_mb(); \
> + return ___p1; \
> +} while (0)
> +
> #endif /* !__ASSEMBLY__ */
> #endif /* _ASM_TILE_BARRIER_H */
> diff --git a/arch/unicore32/include/asm/barrier.h b/arch/unicore32/include/asm/barrier.h
> index a6620e5336b6..fa8bf69d9a09 100644
> --- a/arch/unicore32/include/asm/barrier.h
> +++ b/arch/unicore32/include/asm/barrier.h
> @@ -25,4 +25,17 @@
>
> #define set_mb(var, value) do { var = value; smp_mb(); } while (0)
>
> +#define smp_store_release(p, v) \
> +do { \
> + smp_mb(); \
> + ACCESS_ONCE(p) = (v); \
> +} while (0)
> +
> +#define smp_load_acquire(p) \
> +do { \
> + typeof(p) ___p1 = ACCESS_ONCE(p); \
> + smp_mb(); \
> + return ___p1; \
> +} while (0)
> +
> #endif /* __UNICORE_BARRIER_H__ */
> diff --git a/arch/x86/include/asm/barrier.h b/arch/x86/include/asm/barrier.h
> index c6cd358a1eec..115ef72b3784 100644
> --- a/arch/x86/include/asm/barrier.h
> +++ b/arch/x86/include/asm/barrier.h
> @@ -100,6 +100,19 @@
> #define set_mb(var, value) do { var = value; barrier(); } while (0)
> #endif
>
> +#define smp_store_release(p, v) \
> +do { \
> + barrier(); \
> + ACCESS_ONCE(p) = (v); \
> +} while (0)
> +
> +#define smp_load_acquire(p) \
> +do { \
> + typeof(p) ___p1 = ACCESS_ONCE(p); \
> + barrier(); \
> + return ___p1; \
> +} while (0)
> +
> /*
> * Stop RDTSC speculation. This is needed when you need to use RDTSC
> * (or get_cycles or vread that possibly accesses the TSC) in a defined
> diff --git a/arch/xtensa/include/asm/barrier.h b/arch/xtensa/include/asm/barrier.h
> index ef021677d536..e96a674c337a 100644
> --- a/arch/xtensa/include/asm/barrier.h
> +++ b/arch/xtensa/include/asm/barrier.h
> @@ -26,4 +26,17 @@
>
> #define set_mb(var, value) do { var = value; mb(); } while (0)
>
> +#define smp_store_release(p, v) \
> +do { \
> + smp_mb(); \
> + ACCESS_ONCE(p) = (v); \
> +} while (0)
> +
> +#define smp_load_acquire(p) \
> +do { \
> + typeof(p) ___p1 = ACCESS_ONCE(p); \
> + smp_mb(); \
> + return ___p1; \
> +} while (0)
> +
> #endif /* _XTENSA_SYSTEM_H */
>
--
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