From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5372612E6D; Sat, 3 Feb 2024 04:15:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706933721; cv=none; b=Z4ZAxHhH5mgu362MxjuSFyx0q5CKsKSV/6kThQi2cVeWv9AFJTtqXJSneB047hcMXNqNqOI7PXcHv5x5Uymg/czOg0tHIDvjpH5oyhFmGYCz8VmfQAZUs5alVIYM8uIy8hkTzjwQYNoRWRlTcd3SKQF5n2jVv8/jjHgD1KpflZc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706933721; c=relaxed/simple; bh=pEv86BzAivXO6GG4qpR7So2cmGwf+F2yi+Ic5kMGQfE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=BNk23YdxrFrr0oq1t5Ja1EjLMwL7RWf5IUDoGPllo3envZyAOmBVRZmd5zMhQ0aJNtr/d3a2i0/7TCAdIW+1aVg2a87nLfATQcyBr1RNAMT1WRIlc5/b/OLKSdZ0LKhKEPy1+O5AjVdp+fFOa2sN6m78OQjZcK2yKxFvDlsMQjA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=E3nVOsw4; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="E3nVOsw4" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 168D2C43390; Sat, 3 Feb 2024 04:15:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1706933721; bh=pEv86BzAivXO6GG4qpR7So2cmGwf+F2yi+Ic5kMGQfE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=E3nVOsw4dGFKjHJUJrJzL87qElcaaEgAidCQpQfmtPEIuuXuTr0z4bJTNJS75FA3/ P44m+NqvAj9uRV8kV0Wahr632KC63JUsUkbEWLakWPdkjmbwQ4L6bMWFFeLtSzvtU7 PkKQodDy2isILely48zND8CipslxV973HllWyY+8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Huacai Chen Subject: [PATCH 6.6 320/322] LoongArch/smp: Call rcutree_report_cpu_starting() at tlb_init() Date: Fri, 2 Feb 2024 20:06:57 -0800 Message-ID: <20240203035409.374589337@linuxfoundation.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240203035359.041730947@linuxfoundation.org> References: <20240203035359.041730947@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Huacai Chen commit 5056c596c3d1848021a4eaa76ee42f4c05c50346 upstream. Machines which have more than 8 nodes fail to boot SMP after commit a2ccf46333d7b2cf96 ("LoongArch/smp: Call rcutree_report_cpu_starting() earlier"). Because such machines use tlb-based per-cpu base address rather than dmw-based per-cpu base address, resulting per-cpu variables can only be accessed after tlb_init(). But rcutree_report_cpu_starting() is now called before tlb_init() and accesses per-cpu variables indeed. Since the original patch want to avoid the lockdep warning caused by page allocation in tlb_init(), we can move rcutree_report_cpu_starting() to tlb_init() where after tlb exception configuration but before page allocation. Fixes: a2ccf46333d7b2cf96 ("LoongArch/smp: Call rcutree_report_cpu_starting() earlier") Signed-off-by: Huacai Chen Signed-off-by: Greg Kroah-Hartman --- arch/loongarch/kernel/smp.c | 1 - arch/loongarch/mm/tlb.c | 16 ++++++++++------ 2 files changed, 10 insertions(+), 7 deletions(-) --- a/arch/loongarch/kernel/smp.c +++ b/arch/loongarch/kernel/smp.c @@ -506,7 +506,6 @@ asmlinkage void start_secondary(void) sync_counter(); cpu = raw_smp_processor_id(); set_my_cpu_offset(per_cpu_offset(cpu)); - rcu_cpu_starting(cpu); cpu_probe(); constant_clockevent_init(); --- a/arch/loongarch/mm/tlb.c +++ b/arch/loongarch/mm/tlb.c @@ -284,12 +284,16 @@ static void setup_tlb_handler(int cpu) set_handler(EXCCODE_TLBNR * VECSIZE, handle_tlb_protect, VECSIZE); set_handler(EXCCODE_TLBNX * VECSIZE, handle_tlb_protect, VECSIZE); set_handler(EXCCODE_TLBPE * VECSIZE, handle_tlb_protect, VECSIZE); - } + } else { + int vec_sz __maybe_unused; + void *addr __maybe_unused; + struct page *page __maybe_unused; + + /* Avoid lockdep warning */ + rcu_cpu_starting(cpu); + #ifdef CONFIG_NUMA - else { - void *addr; - struct page *page; - const int vec_sz = sizeof(exception_handlers); + vec_sz = sizeof(exception_handlers); if (pcpu_handlers[cpu]) return; @@ -305,8 +309,8 @@ static void setup_tlb_handler(int cpu) csr_write64(pcpu_handlers[cpu], LOONGARCH_CSR_EENTRY); csr_write64(pcpu_handlers[cpu], LOONGARCH_CSR_MERRENTRY); csr_write64(pcpu_handlers[cpu] + 80*VECSIZE, LOONGARCH_CSR_TLBRENTRY); - } #endif + } } void tlb_init(int cpu)