From: Vineet Gupta <Vineet.Gupta1@synopsys.com> To: linux-snps-arc@lists.infradead.org Cc: Peter Zijlstra <peterz@infradead.org>, Will Deacon <will@kernel.org>, Arnd Bergmann <arnd@arndb.de>, Mark Rutland <mark.rutland@arm.com>, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, Vladimir Isaev <Vladimir.Isaev@synopsys.com>, Vineet Gupta <Vineet.Gupta1@synopsys.com> Subject: [PATCH 10/11] ARC: cmpxchg/xchg: implement relaxed variants (LLSC config only) Date: Wed, 4 Aug 2021 12:15:53 -0700 [thread overview] Message-ID: <20210804191554.1252776-11-vgupta@synopsys.com> (raw) In-Reply-To: <20210804191554.1252776-1-vgupta@synopsys.com> It only makes sense to do this for the LLSC config Signed-off-by: Vineet Gupta <vgupta@synopsys.com> --- arch/arc/include/asm/cmpxchg.h | 11 ++--------- 1 file changed, 2 insertions(+), 9 deletions(-) diff --git a/arch/arc/include/asm/cmpxchg.h b/arch/arc/include/asm/cmpxchg.h index 00deb076d6f6..e2ae0eb1ca07 100644 --- a/arch/arc/include/asm/cmpxchg.h +++ b/arch/arc/include/asm/cmpxchg.h @@ -38,7 +38,7 @@ _prev; \ }) -#define arch_cmpxchg(ptr, old, new) \ +#define arch_cmpxchg_relaxed(ptr, old, new) \ ({ \ __typeof__(ptr) _p_ = (ptr); \ __typeof__(*(ptr)) _o_ = (old); \ @@ -47,12 +47,7 @@ \ switch(sizeof((_p_))) { \ case 4: \ - /* \ - * Explicit full memory barrier needed before/after \ - */ \ - smp_mb(); \ _prev_ = __cmpxchg(_p_, _o_, _n_); \ - smp_mb(); \ break; \ default: \ BUILD_BUG(); \ @@ -108,16 +103,14 @@ _val_; /* get old value */ \ }) -#define arch_xchg(ptr, val) \ +#define arch_xchg_relaxed(ptr, val) \ ({ \ __typeof__(ptr) _p_ = (ptr); \ __typeof__(*(ptr)) _val_ = (val); \ \ switch(sizeof(*(_p_))) { \ case 4: \ - smp_mb(); \ _val_ = __xchg(_p_, _val_); \ - smp_mb(); \ break; \ default: \ BUILD_BUG(); \ -- 2.25.1
WARNING: multiple messages have this Message-ID (diff)
From: Vineet Gupta <Vineet.Gupta1@synopsys.com> To: linux-snps-arc@lists.infradead.org Cc: Peter Zijlstra <peterz@infradead.org>, Will Deacon <will@kernel.org>, Arnd Bergmann <arnd@arndb.de>, Mark Rutland <mark.rutland@arm.com>, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, Vladimir Isaev <Vladimir.Isaev@synopsys.com>, Vineet Gupta <Vineet.Gupta1@synopsys.com> Subject: [PATCH 10/11] ARC: cmpxchg/xchg: implement relaxed variants (LLSC config only) Date: Wed, 4 Aug 2021 12:15:53 -0700 [thread overview] Message-ID: <20210804191554.1252776-11-vgupta@synopsys.com> (raw) In-Reply-To: <20210804191554.1252776-1-vgupta@synopsys.com> It only makes sense to do this for the LLSC config Signed-off-by: Vineet Gupta <vgupta@synopsys.com> --- arch/arc/include/asm/cmpxchg.h | 11 ++--------- 1 file changed, 2 insertions(+), 9 deletions(-) diff --git a/arch/arc/include/asm/cmpxchg.h b/arch/arc/include/asm/cmpxchg.h index 00deb076d6f6..e2ae0eb1ca07 100644 --- a/arch/arc/include/asm/cmpxchg.h +++ b/arch/arc/include/asm/cmpxchg.h @@ -38,7 +38,7 @@ _prev; \ }) -#define arch_cmpxchg(ptr, old, new) \ +#define arch_cmpxchg_relaxed(ptr, old, new) \ ({ \ __typeof__(ptr) _p_ = (ptr); \ __typeof__(*(ptr)) _o_ = (old); \ @@ -47,12 +47,7 @@ \ switch(sizeof((_p_))) { \ case 4: \ - /* \ - * Explicit full memory barrier needed before/after \ - */ \ - smp_mb(); \ _prev_ = __cmpxchg(_p_, _o_, _n_); \ - smp_mb(); \ break; \ default: \ BUILD_BUG(); \ @@ -108,16 +103,14 @@ _val_; /* get old value */ \ }) -#define arch_xchg(ptr, val) \ +#define arch_xchg_relaxed(ptr, val) \ ({ \ __typeof__(ptr) _p_ = (ptr); \ __typeof__(*(ptr)) _val_ = (val); \ \ switch(sizeof(*(_p_))) { \ case 4: \ - smp_mb(); \ _val_ = __xchg(_p_, _val_); \ - smp_mb(); \ break; \ default: \ BUILD_BUG(); \ -- 2.25.1 _______________________________________________ linux-snps-arc mailing list linux-snps-arc@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-snps-arc
next prev parent reply other threads:[~2021-08-04 19:16 UTC|newest] Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-08-04 19:15 [PATCH 00/11] ARC atomics update Vineet Gupta 2021-08-04 19:15 ` Vineet Gupta 2021-08-04 19:15 ` [PATCH 01/11] ARC: atomics: disintegrate header Vineet Gupta 2021-08-04 19:15 ` Vineet Gupta 2021-08-04 19:15 ` [PATCH 02/11] ARC: atomic: !LLSC: remove hack in atomic_set() for for UP Vineet Gupta 2021-08-04 19:15 ` Vineet Gupta 2021-08-04 19:15 ` [PATCH 03/11] ARC: atomic: !LLSC: use int data type consistently Vineet Gupta 2021-08-04 19:15 ` Vineet Gupta 2021-08-04 19:15 ` [PATCH 04/11] ARC: atomic64: LLSC: elide unused atomic_{and,or,xor,andnot}_return Vineet Gupta 2021-08-04 19:15 ` [PATCH 04/11] ARC: atomic64: LLSC: elide unused atomic_{and, or, xor, andnot}_return Vineet Gupta 2021-08-04 19:15 ` [PATCH 05/11] ARC: atomics: implement relaxed variants Vineet Gupta 2021-08-04 19:15 ` Vineet Gupta 2021-08-04 19:15 ` [PATCH 06/11] ARC: switch to generic bitops Vineet Gupta 2021-08-04 19:15 ` Vineet Gupta 2021-08-04 19:15 ` [PATCH 07/11] ARC: bitops: fls/ffs to take int (vs long) per asm-generic defines Vineet Gupta 2021-08-04 19:15 ` Vineet Gupta 2021-08-04 19:15 ` [PATCH 08/11] ARC: xchg: !LLSC: remove UP micro-optimization/hack Vineet Gupta 2021-08-04 19:15 ` Vineet Gupta 2021-08-04 19:15 ` [PATCH 09/11] ARC: cmpxchg/xchg: rewrite as macros to make type safe Vineet Gupta 2021-08-04 19:15 ` Vineet Gupta 2021-08-04 19:15 ` Vineet Gupta [this message] 2021-08-04 19:15 ` [PATCH 10/11] ARC: cmpxchg/xchg: implement relaxed variants (LLSC config only) Vineet Gupta 2021-08-04 19:15 ` [PATCH 11/11] ARC: atomic_cmpxchg/atomic_xchg: implement relaxed variants Vineet Gupta 2021-08-04 19:15 ` Vineet Gupta 2021-08-05 9:02 ` [PATCH 00/11] ARC atomics update Peter Zijlstra 2021-08-05 9:02 ` Peter Zijlstra 2021-08-05 16:18 ` Vineet Gupta 2021-08-05 16:18 ` Vineet Gupta 2021-08-05 17:04 ` Peter Zijlstra 2021-08-05 17:04 ` Peter Zijlstra 2021-08-05 19:14 ` [RFC] bitops/non-atomic: make @nr unsigned to avoid any DIV Vineet Gupta 2021-08-05 19:14 ` Vineet Gupta 2021-08-06 13:42 ` Will Deacon 2021-08-06 13:42 ` Will Deacon 2021-08-06 19:02 ` Vineet Gupta 2021-08-06 19:02 ` Vineet Gupta 2021-08-06 8:41 ` [PATCH 00/11] ARC atomics update Will Deacon 2021-08-06 8:41 ` Will Deacon
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