From patchwork Tue Nov 21 13:44:00 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Russell King (Oracle)" X-Patchwork-Id: 13463118 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 12313C61D92 for ; Tue, 21 Nov 2023 13:46:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:Date:Message-Id:MIME-Version:Subject:Cc :To:From:References:In-Reply-To:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=ycCN7mA6SO+7MaEv9SNgv9beNdTyKq5Z1PcKdK1ogdU=; b=KLo0iJsU7XH3hO 95MuEENbjcxYG0mXSUpr4Xn+QwDju3aVbJY4ew+h24563k7FC8JOEZ0a2C2XpxrA1W5NUKXbxsTqn jx6xE5px2RBw6ud9E5xWLm8g8tv8dY3zhn3YPdXCCDlBAwJgabjqHbUd4ed+LdbjKuSLrs/x2Fo3W cAsAmWdwOQPP0oBIO0Sw/KqS0N8LN/HGaXo6ryDBZiZZiVAeAMT7eXDg9v3cG/Ldrs6ZWw7ly4s3q hJJZ0dirV1dlsaQf7rUk6/HFEgs7II5uqOCPPRR/opfGk6byDp7nue4k/cUrz2s0RFZ+eg2KOU60s 3Hp9tfWyMlvNsMuKy1oA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1r5R57-00GsPX-0Y; Tue, 21 Nov 2023 13:46:25 +0000 Received: from pandora.armlinux.org.uk ([2001:4d48:ad52:32c8:5054:ff:fe00:142]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1r5R55-00GqfH-01; Tue, 21 Nov 2023 13:46:24 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=armlinux.org.uk; s=pandora-2019; h=Date:Sender:Message-Id:Content-Type: Content-Transfer-Encoding:MIME-Version:Subject:Cc:To:From:References: In-Reply-To:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=IPSQ290E8DPF5FLSe+aRGb8AySZwOAxe+Qbv5W0+qQc=; b=jrLhUefGLk5f1PUHRc9HCT+s/S +wW1S09TAissMwnXitFWK/CuI7r5adngvPI/jZLJVr+4kfplr3BNwLqaiOwHJ27LuuDqEl9cCbJl4 mmotbGrSMp2dHExGSotlIWKkebYzsDYEG3l5LuqzwnxOOMwKx8rB8o2/6eWTA7o95LcLX97EE0LoP uel1PYd3KgBKpEcSMguCb+XzuWlfP09P7s9JVpJzj+3CY7ePOnozJpoiq3iNTla0bakA7IsSp+HUH i7rz61w+2GP8377PwsePQpuoxd16ji8a7AGAuf5GdiOqMph9l7NkqpextIvhoU2GqGqMw0m8KYBsw 4jd+0f9g==; Received: from e0022681537dd.dyn.armlinux.org.uk ([fd8f:7570:feb6:1:222:68ff:fe15:37dd]:51922 helo=rmk-PC.armlinux.org.uk) by pandora.armlinux.org.uk with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1r5R2k-00076J-0R; Tue, 21 Nov 2023 13:43:58 +0000 Received: from rmk by rmk-PC.armlinux.org.uk with local (Exim 4.94.2) (envelope-from ) id 1r5R2m-00Csyb-2S; Tue, 21 Nov 2023 13:44:00 +0000 In-Reply-To: References: From: Russell King (Oracle) To: linux-pm@vger.kernel.org, loongarch@lists.linux.dev, linux-acpi@vger.kernel.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-riscv@lists.infradead.org, kvmarm@lists.linux.dev, x86@kernel.org, linux-csky@vger.kernel.org, linux-doc@vger.kernel.org, linux-ia64@vger.kernel.org, linux-parisc@vger.kernel.org Cc: Salil Mehta , Jean-Philippe Brucker , jianyong.wu@arm.com, justin.he@arm.com, James Morse , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" Subject: [PATCH 02/21] x86: intel_epb: Don't rely on link order MIME-Version: 1.0 Content-Disposition: inline Message-Id: Date: Tue, 21 Nov 2023 13:44:00 +0000 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231121_054623_044056_740DD55D X-CRM114-Status: GOOD ( 11.60 ) 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 From: James Morse intel_epb_init() is called as a subsys_initcall() to register cpuhp callbacks. The callbacks make use of get_cpu_device() which will return NULL unless register_cpu() has been called. register_cpu() is called from topology_init(), which is also a subsys_initcall(). This is fragile. Moving the register_cpu() to a different subsys_initcall() leads to a NULL dereference during boot. Make intel_epb_init() a late_initcall(), user-space can't provide a policy before this point anyway. Signed-off-by: James Morse Reviewed-by: Gavin Shan Signed-off-by: Russell King (Oracle) Acked-by: Rafael J. Wysocki --- subsys_initcall_sync() would be an option, but moving the register_cpu() calls into ACPI also means adding a safety net for CPUs that are online but not described properly by firmware. This lives in subsys_initcall_sync(). --- arch/x86/kernel/cpu/intel_epb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kernel/cpu/intel_epb.c b/arch/x86/kernel/cpu/intel_epb.c index e4c3ba91321c..f18d35fe27a9 100644 --- a/arch/x86/kernel/cpu/intel_epb.c +++ b/arch/x86/kernel/cpu/intel_epb.c @@ -237,4 +237,4 @@ static __init int intel_epb_init(void) cpuhp_remove_state(CPUHP_AP_X86_INTEL_EPB_ONLINE); return ret; } -subsys_initcall(intel_epb_init); +late_initcall(intel_epb_init);