From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752482AbcF1V5M (ORCPT ); Tue, 28 Jun 2016 17:57:12 -0400 Received: from mx2.suse.de ([195.135.220.15]:50321 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752071AbcF1V5L (ORCPT ); Tue, 28 Jun 2016 17:57:11 -0400 Date: Tue, 28 Jun 2016 14:56:51 -0700 From: Davidlohr Bueso To: Peter Zijlstra Cc: mingo@kernel.org, davem@davemloft.net, cw00.choi@samsung.com, dougthompson@xmission.com, bp@alien8.de, mchehab@osg.samsung.com, gregkh@linuxfoundation.org, pfg@sgi.com, jikos@kernel.org, hans.verkuil@cisco.com, awalls@md.metrocast.net, dledford@redhat.com, sean.hefty@intel.com, kys@microsoft.com, heiko.carstens@de.ibm.com, James.Bottomley@HansenPartnership.com, sumit.semwal@linaro.org, schwidefsky@de.ibm.com, linux-kernel@vger.kernel.org, Davidlohr Bueso Subject: [PATCH -v4 01/12] locking/atomic: Introduce inc/dec calls for FETCH-OP flavors Message-ID: <20160628215651.GA20048@linux-80c1.suse> References: <1466453164-13185-1-git-send-email-dave@stgolabs.net> <1466453164-13185-2-git-send-email-dave@stgolabs.net> <20160621133310.GA24567@linux-80c1.suse> <20160621163611.GA3790@linux-80c1.suse> <20160623090942.GI30154@twins.programming.kicks-ass.net> <20160624163430.GA11823@linux-80c1.suse> <20160624184857.GD30154@twins.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline In-Reply-To: <20160624184857.GD30154@twins.programming.kicks-ass.net> User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org With the inclusion of atomic FETCH-OP variants, many places in the kernel can make use of atomic_fetch_$op() to avoid the callers that need to compute the value/state _before_ the operation. Peter laid out the machinery but we are still missing the simpler dec,inc calls (which future patches will make use of). This patch only deals with the generic code, as at least right now no arch actually implement them -- which is similar to what the OP-RETURN primitives currently do. Signed-off-by: Davidlohr Bueso --- include/asm-generic/atomic-long.h | 22 +++++++ include/linux/atomic.h | 128 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 150 insertions(+) diff --git a/include/asm-generic/atomic-long.h b/include/asm-generic/atomic-long.h index 2d0d3cf791ab..288cc9e96395 100644 --- a/include/asm-generic/atomic-long.h +++ b/include/asm-generic/atomic-long.h @@ -146,6 +146,28 @@ ATOMIC_LONG_FETCH_OP(xor, _relaxed) ATOMIC_LONG_FETCH_OP(xor, _acquire) ATOMIC_LONG_FETCH_OP(xor, _release) +#undef ATOMIC_LONG_FETCH_OP + +#define ATOMIC_LONG_FETCH_INC_DEC_OP(op, mo) \ +static inline long \ +atomic_long_fetch_##op##mo(atomic_long_t *l) \ +{ \ + ATOMIC_LONG_PFX(_t) *v = (ATOMIC_LONG_PFX(_t) *)l; \ + \ + return (long)ATOMIC_LONG_PFX(_fetch_##op##mo)(v); \ +} + +ATOMIC_LONG_FETCH_INC_DEC_OP(inc,) +ATOMIC_LONG_FETCH_INC_DEC_OP(inc, _relaxed) +ATOMIC_LONG_FETCH_INC_DEC_OP(inc, _acquire) +ATOMIC_LONG_FETCH_INC_DEC_OP(inc, _release) +ATOMIC_LONG_FETCH_INC_DEC_OP(dec,) +ATOMIC_LONG_FETCH_INC_DEC_OP(dec, _relaxed) +ATOMIC_LONG_FETCH_INC_DEC_OP(dec, _acquire) +ATOMIC_LONG_FETCH_INC_DEC_OP(dec, _release) + +#undef ATOMIC_LONG_FETCH_INC_DEC_OP + #define ATOMIC_LONG_OP(op) \ static __always_inline void \ atomic_long_##op(long i, atomic_long_t *l) \ diff --git a/include/linux/atomic.h b/include/linux/atomic.h index 12d910d61b83..e71835bf60a9 100644 --- a/include/linux/atomic.h +++ b/include/linux/atomic.h @@ -188,6 +188,38 @@ #endif #endif /* atomic_fetch_add_relaxed */ +/* atomic_fetch_inc_relaxed */ +#ifndef atomic_fetch_inc_relaxed + +#ifndef atomic_fetch_inc +#define atomic_fetch_inc(v) atomic_fetch_add(1, (v)) +#define atomic_fetch_inc_relaxed(v) atomic_fetch_add_relaxed(1, (v)) +#define atomic_fetch_inc_acquire(v) atomic_fetch_add_acquire(1, (v)) +#define atomic_fetch_inc_release(v) atomic_fetch_add_release(1, (v)) +#else /* atomic_fetch_inc */ +#define atomic_fetch_inc_relaxed atomic_fetch_inc +#define atomic_fetch_inc_acquire atomic_fetch_inc +#define atomic_fetch_inc_release atomic_fetch_inc +#endif /* atomic_fetch_inc */ + +#else /* atomic_fetch_inc_relaxed */ + +#ifndef atomic_fetch_inc_acquire +#define atomic_fetch_inc_acquire(...) \ + __atomic_op_acquire(atomic_fetch_inc, __VA_ARGS__) +#endif + +#ifndef atomic_fetch_inc_release +#define atomic_fetch_inc_release(...) \ + __atomic_op_release(atomic_fetch_inc, __VA_ARGS__) +#endif + +#ifndef atomic_fetch_inc +#define atomic_fetch_inc(...) \ + __atomic_op_fence(atomic_fetch_inc, __VA_ARGS__) +#endif +#endif /* atomic_fetch_inc_relaxed */ + /* atomic_fetch_sub_relaxed */ #ifndef atomic_fetch_sub_relaxed #define atomic_fetch_sub_relaxed atomic_fetch_sub @@ -212,6 +244,38 @@ #endif #endif /* atomic_fetch_sub_relaxed */ +/* atomic_fetch_dec_relaxed */ +#ifndef atomic_fetch_dec_relaxed + +#ifndef atomic_fetch_dec +#define atomic_fetch_dec(v) atomic_fetch_sub(1, (v)) +#define atomic_fetch_dec_relaxed(v) atomic_fetch_sub_relaxed(1, (v)) +#define atomic_fetch_dec_acquire(v) atomic_fetch_sub_acquire(1, (v)) +#define atomic_fetch_dec_release(v) atomic_fetch_sub_release(1, (v)) +#else /* atomic_fetch_dec */ +#define atomic_fetch_dec_relaxed atomic_fetch_dec +#define atomic_fetch_dec_acquire atomic_fetch_dec +#define atomic_fetch_dec_release atomic_fetch_dec +#endif /* atomic_fetch_dec */ + +#else /* atomic_fetch_dec_relaxed */ + +#ifndef atomic_fetch_dec_acquire +#define atomic_fetch_dec_acquire(...) \ + __atomic_op_acquire(atomic_fetch_dec, __VA_ARGS__) +#endif + +#ifndef atomic_fetch_dec_release +#define atomic_fetch_dec_release(...) \ + __atomic_op_release(atomic_fetch_dec, __VA_ARGS__) +#endif + +#ifndef atomic_fetch_dec +#define atomic_fetch_dec(...) \ + __atomic_op_fence(atomic_fetch_dec, __VA_ARGS__) +#endif +#endif /* atomic_fetch_dec_relaxed */ + /* atomic_fetch_or_relaxed */ #ifndef atomic_fetch_or_relaxed #define atomic_fetch_or_relaxed atomic_fetch_or @@ -697,6 +761,38 @@ static inline int atomic_dec_if_positive(atomic_t *v) #endif #endif /* atomic64_fetch_add_relaxed */ +/* atomic64_fetch_inc_relaxed */ +#ifndef atomic64_fetch_inc_relaxed + +#ifndef atomic64_fetch_inc +#define atomic64_fetch_inc(v) atomic64_fetch_add(1, (v)) +#define atomic64_fetch_inc_relaxed(v) atomic64_fetch_add_relaxed(1, (v)) +#define atomic64_fetch_inc_acquire(v) atomic64_fetch_add_acquire(1, (v)) +#define atomic64_fetch_inc_release(v) atomic64_fetch_add_release(1, (v)) +#else /* atomic64_fetch_inc */ +#define atomic64_fetch_inc_relaxed atomic64_fetch_inc +#define atomic64_fetch_inc_acquire atomic64_fetch_inc +#define atomic64_fetch_inc_release atomic64_fetch_inc +#endif /* atomic64_fetch_inc */ + +#else /* atomic64_fetch_inc_relaxed */ + +#ifndef atomic64_fetch_inc_acquire +#define atomic64_fetch_inc_acquire(...) \ + __atomic_op_acquire(atomic64_fetch_inc, __VA_ARGS__) +#endif + +#ifndef atomic64_fetch_inc_release +#define atomic64_fetch_inc_release(...) \ + __atomic_op_release(atomic64_fetch_inc, __VA_ARGS__) +#endif + +#ifndef atomic64_fetch_inc +#define atomic64_fetch_inc(...) \ + __atomic_op_fence(atomic64_fetch_inc, __VA_ARGS__) +#endif +#endif /* atomic64_fetch_inc_relaxed */ + /* atomic64_fetch_sub_relaxed */ #ifndef atomic64_fetch_sub_relaxed #define atomic64_fetch_sub_relaxed atomic64_fetch_sub @@ -721,6 +817,38 @@ static inline int atomic_dec_if_positive(atomic_t *v) #endif #endif /* atomic64_fetch_sub_relaxed */ +/* atomic64_fetch_dec_relaxed */ +#ifndef atomic64_fetch_dec_relaxed + +#ifndef atomic64_fetch_dec +#define atomic64_fetch_dec(v) atomic64_fetch_sub(1, (v)) +#define atomic64_fetch_dec_relaxed(v) atomic64_fetch_sub_relaxed(1, (v)) +#define atomic64_fetch_dec_acquire(v) atomic64_fetch_sub_acquire(1, (v)) +#define atomic64_fetch_dec_release(v) atomic64_fetch_sub_release(1, (v)) +#else /* atomic64_fetch_dec */ +#define atomic64_fetch_dec_relaxed atomic64_fetch_dec +#define atomic64_fetch_dec_acquire atomic64_fetch_dec +#define atomic64_fetch_dec_release atomic64_fetch_dec +#endif /* atomic64_fetch_dec */ + +#else /* atomic64_fetch_dec_relaxed */ + +#ifndef atomic64_fetch_dec_acquire +#define atomic64_fetch_dec_acquire(...) \ + __atomic_op_acquire(atomic64_fetch_dec, __VA_ARGS__) +#endif + +#ifndef atomic64_fetch_dec_release +#define atomic64_fetch_dec_release(...) \ + __atomic_op_release(atomic64_fetch_dec, __VA_ARGS__) +#endif + +#ifndef atomic64_fetch_dec +#define atomic64_fetch_dec(...) \ + __atomic_op_fence(atomic64_fetch_dec, __VA_ARGS__) +#endif +#endif /* atomic64_fetch_dec_relaxed */ + /* atomic64_fetch_or_relaxed */ #ifndef atomic64_fetch_or_relaxed #define atomic64_fetch_or_relaxed atomic64_fetch_or -- 2.6.6