From mboxrd@z Thu Jan 1 00:00:00 1970 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 94D79C79F82 for ; Fri, 4 Sep 2026 16:19:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id: Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-Id:Date :Subject:To:From:Reply-To:Content-Type:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=NgBjIEID6QEhIkoB2QsEvwX/Fvm/Oh4imRgw1L0n/cg=; b=18fcfhwHp4E5l/ xbUe6jhKukmmch7GAWf/NUUkMgHpbhEY7r1NUzP+jae/zgQ9Xzf7QJMFSVqdEY5S0PBgG2t09R5Pt r0KrGAbacUTmid+bp2fcLMbNBNCgYJpjlCQtaVBVGhaKyz5Yv2BN3IhoRIm9Erj+8EbtPsA7ipzR1 kwoG7wa5mtBRAEh9i9i4Z3JHtSAvEMIOkTcdHGda7kcwP08NtSsC6LlRx6tlux8y1JTJ/72vv72Mj zbsFJlOd1RzZ12WGQ5MQGTsqP6d/ptPiFMDs6M3dxVuLqBMRwy4QUpcjCwP25mcJkLISIHEwlEbmP Fcg+5Nc9NMkPXd7GXKLA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1x2WdP-00000002heh-1Ojp; Fri, 04 Sep 2026 16:19:23 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1x2WdL-00000002hZM-0k63 for linux-arm-kernel@lists.infradead.org; Fri, 04 Sep 2026 16:19:20 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id B737F169C; Fri, 4 Sep 2026 09:19:13 -0700 (PDT) Received: from lakrids.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.121.207.14]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 70BD23F673; Fri, 4 Sep 2026 09:19:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1788538757; bh=i6uO/jj8wEknXLiLBTGSQRd6LqWzqYzc+btd1yT327U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=owuUoS8DqJFW5eEiv8+r4W2JWCoO4ejeLm7OUu5P72hb/bwUQEJvsFHkgxd810BT0 JEZMVMZvlIx1wxm+QeOqlP67xk/8p07UYY6HljTcb9J3bVSZ7AIOSo/dN06buHxxSB 53owcEslbiK/aKejwzrTo7tUxV5D8U6dtM4C+HUc= From: Mark Rutland To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v3 21/21] arm64: percpu: Remove _pcp_protect*() wrappers Date: Fri, 4 Sep 2026 17:17:58 +0100 Message-Id: <20260904161758.376504-22-mark.rutland@arm.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20260904161758.376504-1-mark.rutland@arm.com> References: <20260904161758.376504-1-mark.rutland@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260904_091919_285039_24535C7E X-CRM114-Status: GOOD ( 11.48 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, vladimir.murzin@arm.com, usama.anjum@arm.com, peterz@infradead.org, catalin.marinas@arm.com, david.laight.linux@gmail.com, stable@vger.kernel.org, ruanjinjie@huawei.com, james.morse@arm.com, yang@os.amperecomputing.com, cl@gentwo.org, maz@kernel.org, will@kernel.org, ardb@kernel.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Now that all this_cpu_*() operations are preemptible, there are no users of _pcp_protect() or _pcp_protect_return(). Remove them both, along with the associated comment regarding preemption. Signed-off-by: Mark Rutland Tested-by: Muhammad Usama Anjum Cc: Ada Couprie Diaz Cc: Ard Biesheuvel Cc: Catalin Marinas Cc: James Morse Cc: Jinjie Ruan Cc: Marc Zyngier Cc: Peter Zijlstra Cc: Vladimir Murzin Cc: Will Deacon Cc: Yang Shi --- arch/arm64/include/asm/percpu.h | 27 --------------------------- 1 file changed, 27 deletions(-) diff --git a/arch/arm64/include/asm/percpu.h b/arch/arm64/include/asm/percpu.h index 5cd98e20e825d..6ec6e212932d3 100644 --- a/arch/arm64/include/asm/percpu.h +++ b/arch/arm64/include/asm/percpu.h @@ -368,33 +368,6 @@ PERCPU_CMPXCHG_OP(x, , 64) #undef PERCPU_XCHG_OP #undef PERCPU_CMPXCHG_OP -/* - * It would be nice to avoid the conditional call into the scheduler when - * re-enabling preemption for preemptible kernels, but doing that in a way - * which builds inside a module would mean messing directly with the preempt - * count. If you do this, peterz and tglx will hunt you down. - * - * Not to mention it'll break the actual preemption model for missing a - * preemption point when TIF_NEED_RESCHED gets set while preemption is - * disabled. - */ - -#define _pcp_protect(op, pcp, ...) \ -({ \ - preempt_disable_notrace(); \ - op(raw_cpu_ptr(&(pcp)), __VA_ARGS__); \ - preempt_enable_notrace(); \ -}) - -#define _pcp_protect_return(op, pcp, args...) \ -({ \ - typeof(pcp) __retval; \ - preempt_disable_notrace(); \ - __retval = (typeof(pcp))op(raw_cpu_ptr(&(pcp)), ##args); \ - preempt_enable_notrace(); \ - __retval; \ -}) - #define _pcp_wrap(op, pcp, ...) \ ({ \ op(&(pcp), __VA_ARGS__); \ -- 2.30.2