From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 3996B4582D3 for ; Fri, 9 Oct 2026 10:08:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791540533; cv=none; b=QfrmehMvCNhk4OQ7OH7Z/duCXk1pGkn7AiSmYmTFgs5F6mrPhyid9WGLTnu9TAnRA7GgFuEsj6BnguM83qOVOdyHNWkdfu98JJmnY+l/YEcaPVHl9tfh/RCgXa+2qeJRnEfQC4BOuhYqaQcquuJOfKH09ultaWxYEPWu3wjidG0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791540533; c=relaxed/simple; bh=OyUih27sFMvuK4J/ju0pEaDLVI/NOY1vwR/SYNFvfJw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=kkSxRiQ3q1fwhLMnjdUUcEUV/72Qr1YiqoiUoVTRFPycUMWQ0ATM/1FlZzFp8OzRvPOK9mbnwjE3H/ldDaGus25Q5Ddrqtw8ptwOE1ZX3FybRT63YRq9PVV54wI9yvMUlDRSVnuBhj5sj8M68gE3BVzy0f5/1Sq6ldnmkvY9keg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=VV2WNtAS; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="VV2WNtAS" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A927A1F000FF; Fri, 9 Oct 2026 10:08:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1791540531; bh=Gf3FKiGtI6KQvcd0GShYu0Q8rw5bxQGuG60R9wMsHvs=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=VV2WNtASTb2ywGrU+P4MagqzQJqSlcybnay65ivhhNFbICQvC4wYZdl74iX5p9Rfd jIkMWR4TpDIzC1NUJmuPT8uxCapov3UFXt+32M6W/cMc02/mrDyGy/gZzCiagy2Wg5 bkBbYrcfYeFQGi6UARjSzRcKaDeAPf1FLLKfjwMxXWDbDJfibt2WqE2RILQpyd+E6b /NKzj8/lnEYGX4NoqKalXw+d+jcWUlqvxhb6aVAxApBurH1n9YKkYB1Dqtfrr8vhe1 F8W0L7+03vjR3nj0F5hSVnurbAY3F8hm0RzQxqjctKtcRjQNF9SsDEW+L6eWP/FAuF tN+pSm7bBspvQ== From: Will Deacon To: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org, Will Deacon , Thomas Gleixner , Ben Horgan , =?UTF-8?q?=C8=98tefania=20Ion?= , Catalin Marinas , Pankaj Patil , Borislav Petkov , Lorenzo Pieralisi , Jinjie Ruan , Mark Rutland , Tarun Sahu , Fuad Tabba , David Woodhouse , Peter Zijlstra , Marc Zyngier Subject: [PATCH v2 17/23] arm64: cpu_ops: Introduce get_secondary_cpu_ops() Date: Fri, 9 Oct 2026 11:07:28 +0100 Message-ID: <20261009100738.31288-18-will@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20261009100738.31288-1-will@kernel.org> References: <20261009100738.31288-1-will@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Introduce get_secondary_cpu_ops() to retrieve a pointer to the 'cpu_operations' structure for the non-boot CPUs and use it instead of get_cpu_ops() where we are dealing with secondary CPUs. This is a pre-requisite for enabling parallel CPU bring-up. Reviewed-by: Jinjie Ruan Signed-off-by: Will Deacon --- arch/arm64/include/asm/cpu_ops.h | 1 + arch/arm64/kernel/cpu_ops.c | 5 +++++ arch/arm64/kernel/smp.c | 19 +++++++------------ 3 files changed, 13 insertions(+), 12 deletions(-) diff --git a/arch/arm64/include/asm/cpu_ops.h b/arch/arm64/include/asm/cpu_ops.h index a444c8915e88..cd298a8710d8 100644 --- a/arch/arm64/include/asm/cpu_ops.h +++ b/arch/arm64/include/asm/cpu_ops.h @@ -48,6 +48,7 @@ struct cpu_operations { int __init init_cpu_ops(int cpu); extern const struct cpu_operations *get_cpu_ops(int cpu); +extern const struct cpu_operations *get_secondary_cpu_ops(void); static inline void __init init_bootcpu_ops(void) { diff --git a/arch/arm64/kernel/cpu_ops.c b/arch/arm64/kernel/cpu_ops.c index eacfb88a0c0c..7d183ca31dc8 100644 --- a/arch/arm64/kernel/cpu_ops.c +++ b/arch/arm64/kernel/cpu_ops.c @@ -127,3 +127,8 @@ const struct cpu_operations *get_cpu_ops(int cpu) return NULL; } + +const struct cpu_operations *get_secondary_cpu_ops(void) +{ + return cpu_ops; +} diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c index 918b54d1c301..f7141ec18029 100644 --- a/arch/arm64/kernel/smp.c +++ b/arch/arm64/kernel/smp.c @@ -100,7 +100,7 @@ static inline int op_cpu_kill(unsigned int cpu) */ static int boot_secondary(unsigned int cpu, struct task_struct *idle) { - const struct cpu_operations *ops = get_cpu_ops(cpu); + const struct cpu_operations *ops = get_secondary_cpu_ops(); if (ops->cpu_boot) return ops->cpu_boot(cpu); @@ -221,7 +221,7 @@ asmlinkage notrace void secondary_start_kernel(void) */ check_local_cpu_capabilities(); - ops = get_cpu_ops(cpu); + ops = get_secondary_cpu_ops(); if (ops->cpu_postboot) ops->cpu_postboot(); @@ -329,7 +329,7 @@ int __cpu_disable(void) static int op_cpu_kill(unsigned int cpu) { - const struct cpu_operations *ops = get_cpu_ops(cpu); + const struct cpu_operations *ops = get_secondary_cpu_ops(); /* * If we have no means of synchronising with the dying CPU, then assume @@ -370,7 +370,7 @@ void arch_cpuhp_cleanup_dead_cpu(unsigned int cpu) void __noreturn cpu_die(void) { unsigned int cpu = smp_processor_id(); - const struct cpu_operations *ops = get_cpu_ops(cpu); + const struct cpu_operations *ops = get_secondary_cpu_ops(); idle_task_exit(); @@ -496,7 +496,7 @@ static int __init smp_cpu_setup(int cpu) if (init_cpu_ops(cpu)) return -ENODEV; - ops = get_cpu_ops(cpu); + ops = get_secondary_cpu_ops(); if (ops->cpu_init(cpu)) return -ENODEV; @@ -780,7 +780,7 @@ void __init smp_init_cpus(void) void __init smp_prepare_cpus(unsigned int max_cpus) { - const struct cpu_operations *ops; + const struct cpu_operations *ops = get_secondary_cpu_ops(); unsigned int cpu; int err; @@ -806,10 +806,6 @@ void __init smp_prepare_cpus(unsigned int max_cpus) if (cpu == 0) continue; - ops = get_cpu_ops(cpu); - if (!ops) - continue; - err = ops->cpu_prepare(cpu); if (err) continue; @@ -1345,8 +1341,7 @@ bool smp_crash_stop_failed(void) static bool have_cpu_die(void) { #ifdef CONFIG_HOTPLUG_CPU - int any_cpu = raw_smp_processor_id(); - const struct cpu_operations *ops = get_cpu_ops(any_cpu); + const struct cpu_operations *ops = get_secondary_cpu_ops(); if (ops && ops->cpu_die) return true; -- 2.56.0.385.gd3acb90ef8-goog