From nobody Sat Apr 11 19:58:46 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 65CE0C00140 for ; Mon, 8 Aug 2022 08:06:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242103AbiHHIGZ (ORCPT ); Mon, 8 Aug 2022 04:06:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37836 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242092AbiHHIGU (ORCPT ); Mon, 8 Aug 2022 04:06:20 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9F14B11472; Mon, 8 Aug 2022 01:06:19 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 2756260EA5; Mon, 8 Aug 2022 08:06:19 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B8661C43470; Mon, 8 Aug 2022 08:06:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1659945978; bh=E9+7aC4Yw8oq+CFp7IBpO6wuIDD2IWECqn1vNuAh4Gg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Z0qSkbBljX/OZVI0viXnuLml2pfStiIeGHBuHL3siHSedGE3HFxJdpmfkjTY9a4o2 f5NMfXHQKQHILSlbZ1zG2pisBhbG7vz014u3Y8Sp2Oz9cu+qVCv7crr5i34VxSOz/8 XdZ+Ln/igjZG2mQylv4rBO7mxi0r7j8Nf/S4X9deoEe+uC5XXgDh6+sP2fRdNioMi5 UCeotd8qCbNhW8Si/WhecVACDm2EMuIWOPIm+Bc3nUYy2bw0BBOwjV1WAVbKfLD+Pp e4bTQ01W5hKN5m7clD3wp5pv+E0xom6T3Qym7q5pccVtQRktYW7+v+vDOS3scds5ch W3IXChEmQpSkQ== From: guoren@kernel.org To: tj@kernel.org, cl@linux.com, palmer@dabbelt.com, will@kernel.org, catalin.marinas@arm.com, peterz@infradead.org, arnd@arndb.de Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, Guo Ren , Guo Ren Subject: [RFC PATCH 1/4] vmstat: percpu: Rename HAVE_CMPXCHG_LOCAL to HAVE_CMPXCHG_PERCPU_BYTE Date: Mon, 8 Aug 2022 04:05:57 -0400 Message-Id: <20220808080600.3346843-2-guoren@kernel.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220808080600.3346843-1-guoren@kernel.org> References: <20220808080600.3346843-1-guoren@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Guo Ren The name HAVE_CMPXCHG_LOCAL is confused with using cmpxchg_local, but vmstat needs this_cpu_cmpxchg_1. Rename would clarify the meaning, and maybe we could remove cmpxchg(64)_local API (Only drivers/iommu/intel used) in the future. Signed-off-by: Guo Ren Signed-off-by: Guo Ren --- .../features/locking/cmpxchg-local/arch-support.txt | 6 +++--- arch/Kconfig | 2 +- arch/arm64/Kconfig | 2 +- arch/s390/Kconfig | 2 +- arch/x86/Kconfig | 2 +- mm/vmstat.c | 4 ++-- 6 files changed, 9 insertions(+), 9 deletions(-) diff --git a/Documentation/features/locking/cmpxchg-local/arch-support.txt = b/Documentation/features/locking/cmpxchg-local/arch-support.txt index 8b1a8d9e1c79..4d4c5c2fa66d 100644 --- a/Documentation/features/locking/cmpxchg-local/arch-support.txt +++ b/Documentation/features/locking/cmpxchg-local/arch-support.txt @@ -1,7 +1,7 @@ # -# Feature name: cmpxchg-local -# Kconfig: HAVE_CMPXCHG_LOCAL -# description: arch supports the this_cpu_cmpxchg() API +# Feature name: cmpxchg-percpu-byte +# Kconfig: HAVE_CMPXCHG_PERCPU_BYTE +# description: arch supports the this_cpu_cmpxchg_1() API # ----------------------- | arch |status| diff --git a/arch/Kconfig b/arch/Kconfig index f330410da63a..81800cdfe161 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -471,7 +471,7 @@ config HAVE_ALIGNED_STRUCT_PAGE on a struct page for better performance. However selecting this might increase the size of a struct page by a word. =20 -config HAVE_CMPXCHG_LOCAL +config HAVE_CMPXCHG_PERCPU_BYTE bool =20 config HAVE_CMPXCHG_DOUBLE diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 571cc234d0b3..24a82bdc766a 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -175,7 +175,7 @@ config ARM64 select HAVE_EBPF_JIT select HAVE_C_RECORDMCOUNT select HAVE_CMPXCHG_DOUBLE - select HAVE_CMPXCHG_LOCAL + select HAVE_CMPXCHG_PERCPU_BYTE select HAVE_CONTEXT_TRACKING_USER select HAVE_DEBUG_KMEMLEAK select HAVE_DMA_CONTIGUOUS diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index 318fce77601d..ac03af800bf7 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -151,7 +151,7 @@ config S390 select HAVE_ARCH_VMAP_STACK select HAVE_ASM_MODVERSIONS select HAVE_CMPXCHG_DOUBLE - select HAVE_CMPXCHG_LOCAL + select HAVE_CMPXCHG_PERCPU_BYTE select HAVE_DEBUG_KMEMLEAK select HAVE_DMA_CONTIGUOUS select HAVE_DYNAMIC_FTRACE diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index f9920f1341c8..5f4f6df7b89f 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -184,7 +184,7 @@ config X86 select HAVE_ARCH_WITHIN_STACK_FRAMES select HAVE_ASM_MODVERSIONS select HAVE_CMPXCHG_DOUBLE - select HAVE_CMPXCHG_LOCAL + select HAVE_CMPXCHG_PERCPU_BYTE select HAVE_CONTEXT_TRACKING_USER if X86_64 select HAVE_CONTEXT_TRACKING_USER_OFFSTACK if HAVE_CONTEXT_TRACKING_USER select HAVE_C_RECORDMCOUNT diff --git a/mm/vmstat.c b/mm/vmstat.c index 373d2730fcf2..b2fc6d28d3b2 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -554,9 +554,9 @@ void __dec_node_page_state(struct page *page, enum node= _stat_item item) } EXPORT_SYMBOL(__dec_node_page_state); =20 -#ifdef CONFIG_HAVE_CMPXCHG_LOCAL +#ifdef CONFIG_HAVE_CMPXCHG_PERCPU_BYTE /* - * If we have cmpxchg_local support then we do not need to incur the overh= ead + * If we have this_cpu_cmpxchg_1 arch support then we do not need to incur= the overhead * that comes with local_irq_save/restore if we use this_cpu_cmpxchg. * * mod_state() modifies the zone counter state through atomic per cpu --=20 2.36.1