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 B3D10C79F9E for ; Tue, 8 Sep 2026 15:20:50 +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=J/4oT28fup/ZxV4pDwkrdWaonCNlbao0KnfbR6NXI0U=; b=KgqlVoINCkPRxv 8073RkRSxa9F5dnqHHHHyquY3vdoyWCod4rgK1PrMurR/IBbdE4KeYZ0QlySvK8dDVuyel758OePJ fNE13UQPpgDSDwjzriNxSpeioPnAS4qWp84AP+ThrxpzbVamFCjImRd2nECet1QTxWvXEaU8r1siO yJjsIX1WhI+OVtMxsBMWIvtsDhX8okp86LJhdyXGx0g8zwK0a4JB3QnwrC8Tq4d8SUO1PMjcPfkQS KdFTFPPvwHYKD+CdmJQi4mXzmRTHNiKy4QyQX/Ax124erNS5LqnhNU6oHKqMBqw65Wx79nE39/fwu qz2Zz2p35jRDs5vYmojQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1x3xcp-00000009SHo-03wj; Tue, 08 Sep 2026 15:20:43 +0000 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1x3xcn-00000009SHB-3GdH for linux-arm-kernel@bombadil.infradead.org; Tue, 08 Sep 2026 15:20:41 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=Content-Transfer-Encoding:MIME-Version :References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=J/4oT28fup/ZxV4pDwkrdWaonCNlbao0KnfbR6NXI0U=; b=N2OhlniO30ZT4uzpATIaIRQ0Q8 yiHiW/QYqY403d0oRfQLNDNRpjEXjJoxkQJ+2wP3MHWQs+l7dRZcBhZyrE2hn+8LCEtQ9zvk60DP8 yyhrqfwLNKX5cmisSRpv+oHy4fVBje+VD+QaPjO6mRshq2I3GwhIIRFx6vbAQClSklZjYYY5eGc+L jh96g8soivTp3GfRhFRziKSRu39x6qNcYXmdEISn6aFvmIOGSSQZGgjstFYjWckOOFoWLz7pfmPTE ocR1Vw7Dc6Zy1VnOU1MibxRUdQzLurVr+u3cuPNhEXI/JFvkxWncxQ3+BVrmdFDNwdevZMuSWkp0O NXz+e/yw==; Received: from foss.arm.com ([217.140.110.172]) by desiato.infradead.org with esmtp (Exim 4.99.2 #2 (Red Hat Linux)) id 1x3xck-000000000dR-3vI7 for linux-arm-kernel@lists.infradead.org; Tue, 08 Sep 2026 15:20:40 +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 3933D1C01; Tue, 8 Sep 2026 08:20:34 -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 25B5E3F7B4; Tue, 8 Sep 2026 08:20:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1788880837; bh=nBixZw3/1BkQyzToGEomClwqPJ2mncw8+26Z2hHqfxo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WZQctxI6borBrSRp66atEYh17JJqVlpIDG9uAcJd74bbKecAvUMHhxEZ4jF8jx0TY 71gS7ZdmpNaqzvzM3pz/6qoFe6hE/kw0CkOlrnM6rW8c9zYf5Hmk8vIjE2KwcpUDMM MVl6XRceGotKrIs8AXKDk3L+G1NqnzpaOaP+kBa0= From: Mark Rutland To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v4 08/21] arm64: ptrace: Always inline pt_regs_[read,write}_reg() Date: Tue, 8 Sep 2026 16:17:28 +0100 Message-Id: <20260908151741.394589-9-mark.rutland@arm.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20260908151741.394589-1-mark.rutland@arm.com> References: <20260908151741.394589-1-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-20260908_162039_133797_29BE2C2F X-CRM114-Status: GOOD ( 10.55 ) 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, 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, 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 In subsequent patches we'll want to use pt_regs_read_reg() and pt_regs_write_reg() in noinstr code. To ensure noinstr safety, both functions must be inlined into their caller. As both functions are marked as 'inline' rather than '__always_inline', that's not strictly guaranteed, and the compiler is permitted to generate out-of-line copies. Mark both functions as '__always_inline' to ensure this. There should be no functional change as a result of this patch. Signed-off-by: Mark Rutland Reviewed-by: Jinjie Ruan Tested-by: Muhammad Usama Anjum Cc: Ada Couprie Diaz Cc: Ard Biesheuvel Cc: Catalin Marinas Cc: James Morse Cc: Marc Zyngier Cc: Peter Zijlstra Cc: Vladimir Murzin Cc: Will Deacon Cc: Yang Shi --- arch/arm64/include/asm/ptrace.h | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/arch/arm64/include/asm/ptrace.h b/arch/arm64/include/asm/ptrace.h index f7dc5fb9427d6..f635c3453a858 100644 --- a/arch/arm64/include/asm/ptrace.h +++ b/arch/arm64/include/asm/ptrace.h @@ -266,7 +266,8 @@ static inline u64 regs_get_register(struct pt_regs *regs, unsigned int offset) * Read a register given an architectural register index r. * This handles the common case where 31 means XZR, not SP. */ -static inline unsigned long pt_regs_read_reg(const struct pt_regs *regs, int r) +static __always_inline unsigned long +pt_regs_read_reg(const struct pt_regs *regs, int r) { return (r == 31) ? 0 : regs->regs[r]; } @@ -275,8 +276,8 @@ static inline unsigned long pt_regs_read_reg(const struct pt_regs *regs, int r) * Write a register given an architectural register index r. * This handles the common case where 31 means XZR, not SP. */ -static inline void pt_regs_write_reg(struct pt_regs *regs, int r, - unsigned long val) +static __always_inline void +pt_regs_write_reg(struct pt_regs *regs, int r, unsigned long val) { if (r != 31) regs->regs[r] = val; -- 2.30.2