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 519CDC5518F for ; Tue, 4 Aug 2026 17:06:57 +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=SULIGTCI2NexN1Zd9UvhnzBgD7k8IR97FtKbUjVGH4U=; b=uNOYSpWlt3rb06 6mh+RGaPYdHjZWr/UIXCBIXtUoTQUUu8mcHexfizoDFSGJF+4kg2fuqmWnrUehVbMpK18e7P2lx80 WcCW83r8XpNDEtU/5suye2qNanitfa5wsVY8WvnURSYsUTjG/pPU8tlgWpZvQpCw0sGvOBME5VyE4 7yF/vj3PXgYQMu0iKKwprxYv/COgqCTjrRI0MjmDbnb95ZOF8yMEGi8bRrdUd44zwHUbZJrOdOOhK Ct4BNZbSeie6ILRyUAe0f0pH2aYWuPpafHTHC2fgErj4n/jhNU2M0nTgvm04LVQK1CuNZASh+2c62 +5F4OP89+vosgLV6D+Pg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wrIbG-00000002RBJ-22oz; Tue, 04 Aug 2026 17:06:46 +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 1wrIbD-00000002R5p-01Ez for linux-arm-kernel@lists.infradead.org; Tue, 04 Aug 2026 17:06:45 +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 9D181168F; Tue, 4 Aug 2026 10:06:37 -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 8C7253F632; Tue, 4 Aug 2026 10:06:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1785863201; bh=N3k/BFqcD2WTlvO7Svd3PMSwWKY1jVLsm+NzT03qOVU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Xa8ZGufPuIFz8CCSyocV/nU9zIT0o78uhZrtFg81RdPfTS9Zk2uQpkIwnkKybOcL3 6hDOmJRpDd94ByEyXIyzhAecqhX8HZhJsiJMBSABWn3NOqBt0q24PTqOPyIEerBxRL jyQhURGb4JLWMcQe2iu+eQbNsspdXOAs0LOGkPXU= From: Mark Rutland To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v2 20/20] arm64: percpu: Remove _pcp_protect*() wrappers Date: Tue, 4 Aug 2026 18:05:03 +0100 Message-Id: <20260804170503.3513916-21-mark.rutland@arm.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20260804170503.3513916-1-mark.rutland@arm.com> References: <20260804170503.3513916-1-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-20260804_100643_208027_FFDBE4D2 X-CRM114-Status: GOOD ( 11.53 ) 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, ryan.roberts@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, david@kernel.org, ljs@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 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 8087ed6e12241..d868a88960123 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