From patchwork Fri Jan 17 15:10:12 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dave Martin X-Patchwork-Id: 13943436 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 50417C02183 for ; Fri, 17 Jan 2025 15:13:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: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:Cc: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=Y7L9yMmJ5aTCZdUcF/ir4P0mH3+A1/6Rg2eTmdlssCI=; b=ChXIjNhsAiRiN5lSoi45tel024 fdQpfuRtgq9CFFejrE5uS8XZbk2pLeTwljDDTpNTrqzyy3Y4GCDQAab6a9th8RLEII7XcM/U3faH0 pEqb9LeUivd9lG/BCJydUuZfpVsDdzaSoKTMnLNplxWym4WeYai+wjDrPPwpKsoKkcpzMaMRri6ui HgF5pUSJi6ezcmn5ouzHYZaOjuxrS//sfb2dLwSSt0i2ZvPgGy7qB8M9VRIcUATAcwQGZOW3C429I gFHc0dJoxd4sc3NDED1DYIEuxo+fo9nAKnfrhXK51Vca0EPh4IGHyYefydmwRnwChrbP/YsipsiZw Kfmh64nA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tYo2M-00000000ZtF-321k; Fri, 17 Jan 2025 15:13:30 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tYnzr-00000000ZET-1GoX for linux-arm-kernel@lists.infradead.org; Fri, 17 Jan 2025 15:10:56 +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 801AC2247; Fri, 17 Jan 2025 07:11:22 -0800 (PST) Received: from e133380.cambridge.arm.com (e133380.arm.com [10.1.197.43]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 6159F3F73F; Fri, 17 Jan 2025 07:10:53 -0800 (PST) From: Dave Martin To: linux-kernel@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org, Zeng Heng , Shaopeng Tan , James Morse Subject: [RFC PATCH v2 02/11] arm_mpam: Delete unused function resctrl_arch_set_rmid() Date: Fri, 17 Jan 2025 15:10:12 +0000 Message-Id: <20250117151033.1517882-3-Dave.Martin@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250117151033.1517882-1-Dave.Martin@arm.com> References: <20250117151033.1517882-1-Dave.Martin@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250117_071055_381225_6FB702AF X-CRM114-Status: UNSURE ( 9.62 ) X-CRM114-Notice: Please train this message. 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The function resctrl_arch_set_rmid() appears to have been left behind after earlier refactoring and is now unused. To avoid needing to answer awkward questions about how this function should apply partition ID namespace remappings, just get rid of it. No functional change. Signed-off-by: Dave Martin --- I'm assuming here that there are no pending branches that implement / use this function. When moving tasks between monitoring groups, resctrlfs currently extracts the CLOSID from struct rdtgroup and passes it explicitly to resctrl_arch_set_closid_rmid(), so there seems to be no need for a separate helper that doesn't overwrite the arch's control partition identifier. --- arch/arm64/include/asm/mpam.h | 14 -------------- 1 file changed, 14 deletions(-) diff --git a/arch/arm64/include/asm/mpam.h b/arch/arm64/include/asm/mpam.h index e5f385767174..df725d2d9d05 100644 --- a/arch/arm64/include/asm/mpam.h +++ b/arch/arm64/include/asm/mpam.h @@ -93,20 +93,6 @@ static inline u64 mpam_get_regval(struct task_struct *tsk) #endif } -static inline void resctrl_arch_set_rmid(struct task_struct *tsk, u32 rmid) -{ -#ifdef CONFIG_ARM64_MPAM - u64 regval = mpam_get_regval(tsk); - - regval &= ~MPAM1_EL1_PMG_D; - regval &= ~MPAM1_EL1_PMG_I; - regval |= FIELD_PREP(MPAM1_EL1_PMG_D, rmid); - regval |= FIELD_PREP(MPAM1_EL1_PMG_I, rmid); - - WRITE_ONCE(task_thread_info(tsk)->mpam_partid_pmg, regval); -#endif -} - static inline void mpam_thread_switch(struct task_struct *tsk) { u64 oldregval;