From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S966428AbeCAHRS (ORCPT ); Thu, 1 Mar 2018 02:17:18 -0500 Received: from conssluserg-03.nifty.com ([210.131.2.82]:30158 "EHLO conssluserg-03.nifty.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S966384AbeCAHRR (ORCPT ); Thu, 1 Mar 2018 02:17:17 -0500 DKIM-Filter: OpenDKIM Filter v2.10.3 conssluserg-03.nifty.com w217H6Ts025018 X-Nifty-SrcIP: [209.85.213.44] X-Google-Smtp-Source: AG47ELsCMpNXA3w72am5hkEcmZFcMZJ6R7YX1NRqZqMqPhyISn81pVQtKbcWu1pKcinxVl8EpuBmERweOTpj6+pTTbY= MIME-Version: 1.0 In-Reply-To: <1519657500-15094-1-git-send-email-will.deacon@arm.com> References: <1519657500-15094-1-git-send-email-will.deacon@arm.com> From: Masahiro Yamada Date: Thu, 1 Mar 2018 16:16:25 +0900 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [RFC PATCH v2 00/12] Rewrite asm-generic/bitops/{atomic,lock}.h and use on arm64 To: Will Deacon Cc: Linux Kernel Mailing List , "Peter Zijlstra (Intel)" , Ingo Molnar , linux-arm-kernel Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 2018-02-27 0:04 GMT+09:00 Will Deacon : > Hi everyone, > > This is version two of the RFC I previously posted here: > > https://www.spinics.net/lists/arm-kernel/msg634719.html > > Changes since v1 include: > > * Fixed __clear_bit_unlock to work on archs with lock-based atomics > * Moved lock ops into bitops/lock.h > * Fixed build breakage on lesser-spotted architectures > > Trying to fix the circular #includes introduced by pulling atomic.h > into btops/lock.h has been driving me insane. I've ended up moving some > basic BIT definitions into bits.h, but this might all be better in > const.h which is being proposed by Masahiro. Feedback is especially > welcome on this part. Info for reviewers: You can see my patches at the following: 1/5: https://patchwork.kernel.org/patch/10235457/ 2/5: https://patchwork.kernel.org/patch/10235461/ 3/5: https://patchwork.kernel.org/patch/10235463/ 4/5: https://patchwork.kernel.org/patch/10235469/ 5/5: https://patchwork.kernel.org/patch/10235471/ 5/5 has conflict with Will's 2/12. Fortunately, it is at the tail of the series. It is easy to pick/drop/change when we decide how to organize it. > I've not bothered optimising for the case of a 64-bit, big-endian > architecture that uses the generic implementation of atomic64_t because > it's both messy and hypothetical. The code here should still work > correctly for that case, it just sucks (as does the implementation > currently in mainline). > > Cheers, > > Will > > --->8 > > Will Deacon (12): > h8300: Don't include linux/kernel.h in asm/atomic.h > m68k: Don't use asm-generic/bitops/lock.h > asm-generic: Move some macros from linux/bitops.h to a new bits.h file > openrisc: Don't pull in all of linux/bitops.h in asm/cmpxchg.h > sh: Don't pull in all of linux/bitops.h in asm/cmpxchg-xchg.h > arm64: fpsimd: include in fpsimd.h > arm64: lse: Include compiler_types.h and export.h for out-of-line > LL/SC > arm64: cmpxchg: Include build_bug.h instead of bug.h for BUILD_BUG > asm-generic/bitops/atomic.h: Rewrite using atomic_fetch_* > asm-generic/bitops/lock.h: Rewrite using atomic_fetch_* > arm64: Replace our atomic/lock bitop implementations with asm-generic > arm64: bitops: Include > > arch/arm64/include/asm/bitops.h | 21 +--- > arch/arm64/include/asm/cmpxchg.h | 2 +- > arch/arm64/include/asm/fpsimd.h | 1 + > arch/arm64/include/asm/lse.h | 2 + > arch/arm64/lib/Makefile | 2 +- > arch/arm64/lib/bitops.S | 76 --------------- > arch/h8300/include/asm/atomic.h | 4 +- > arch/m68k/include/asm/bitops.h | 6 +- > arch/openrisc/include/asm/cmpxchg.h | 3 +- > arch/sh/include/asm/cmpxchg-xchg.h | 3 +- > include/asm-generic/bitops/atomic.h | 188 +++++++----------------------------- > include/asm-generic/bitops/lock.h | 68 ++++++++++--- > include/asm-generic/bits.h | 26 +++++ > include/linux/bitops.h | 22 +---- > 14 files changed, 135 insertions(+), 289 deletions(-) > delete mode 100644 arch/arm64/lib/bitops.S > create mode 100644 include/asm-generic/bits.h > > -- > 2.1.4 > -- Best Regards Masahiro Yamada From mboxrd@z Thu Jan 1 00:00:00 1970 From: yamada.masahiro@socionext.com (Masahiro Yamada) Date: Thu, 1 Mar 2018 16:16:25 +0900 Subject: [RFC PATCH v2 00/12] Rewrite asm-generic/bitops/{atomic,lock}.h and use on arm64 In-Reply-To: <1519657500-15094-1-git-send-email-will.deacon@arm.com> References: <1519657500-15094-1-git-send-email-will.deacon@arm.com> Message-ID: To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 2018-02-27 0:04 GMT+09:00 Will Deacon : > Hi everyone, > > This is version two of the RFC I previously posted here: > > https://www.spinics.net/lists/arm-kernel/msg634719.html > > Changes since v1 include: > > * Fixed __clear_bit_unlock to work on archs with lock-based atomics > * Moved lock ops into bitops/lock.h > * Fixed build breakage on lesser-spotted architectures > > Trying to fix the circular #includes introduced by pulling atomic.h > into btops/lock.h has been driving me insane. I've ended up moving some > basic BIT definitions into bits.h, but this might all be better in > const.h which is being proposed by Masahiro. Feedback is especially > welcome on this part. Info for reviewers: You can see my patches at the following: 1/5: https://patchwork.kernel.org/patch/10235457/ 2/5: https://patchwork.kernel.org/patch/10235461/ 3/5: https://patchwork.kernel.org/patch/10235463/ 4/5: https://patchwork.kernel.org/patch/10235469/ 5/5: https://patchwork.kernel.org/patch/10235471/ 5/5 has conflict with Will's 2/12. Fortunately, it is at the tail of the series. It is easy to pick/drop/change when we decide how to organize it. > I've not bothered optimising for the case of a 64-bit, big-endian > architecture that uses the generic implementation of atomic64_t because > it's both messy and hypothetical. The code here should still work > correctly for that case, it just sucks (as does the implementation > currently in mainline). > > Cheers, > > Will > > --->8 > > Will Deacon (12): > h8300: Don't include linux/kernel.h in asm/atomic.h > m68k: Don't use asm-generic/bitops/lock.h > asm-generic: Move some macros from linux/bitops.h to a new bits.h file > openrisc: Don't pull in all of linux/bitops.h in asm/cmpxchg.h > sh: Don't pull in all of linux/bitops.h in asm/cmpxchg-xchg.h > arm64: fpsimd: include in fpsimd.h > arm64: lse: Include compiler_types.h and export.h for out-of-line > LL/SC > arm64: cmpxchg: Include build_bug.h instead of bug.h for BUILD_BUG > asm-generic/bitops/atomic.h: Rewrite using atomic_fetch_* > asm-generic/bitops/lock.h: Rewrite using atomic_fetch_* > arm64: Replace our atomic/lock bitop implementations with asm-generic > arm64: bitops: Include > > arch/arm64/include/asm/bitops.h | 21 +--- > arch/arm64/include/asm/cmpxchg.h | 2 +- > arch/arm64/include/asm/fpsimd.h | 1 + > arch/arm64/include/asm/lse.h | 2 + > arch/arm64/lib/Makefile | 2 +- > arch/arm64/lib/bitops.S | 76 --------------- > arch/h8300/include/asm/atomic.h | 4 +- > arch/m68k/include/asm/bitops.h | 6 +- > arch/openrisc/include/asm/cmpxchg.h | 3 +- > arch/sh/include/asm/cmpxchg-xchg.h | 3 +- > include/asm-generic/bitops/atomic.h | 188 +++++++----------------------------- > include/asm-generic/bitops/lock.h | 68 ++++++++++--- > include/asm-generic/bits.h | 26 +++++ > include/linux/bitops.h | 22 +---- > 14 files changed, 135 insertions(+), 289 deletions(-) > delete mode 100644 arch/arm64/lib/bitops.S > create mode 100644 include/asm-generic/bits.h > > -- > 2.1.4 > -- Best Regards Masahiro Yamada