linux-kernel - [tip: x86/microcode] x86/microcode: Get rid of the schedule work indirection

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Message-ID: <169685458989.3135.1074830869300543674.tip-bot2@tip-bot2>
Date:   Mon, 09 Oct 2023 12:29:49 -0000
From:   "tip-bot2 for Thomas Gleixner" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        "Borislav Petkov (AMD)" <bp@...en8.de>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/microcode] x86/microcode: Get rid of the schedule work indirection

The following commit has been merged into the x86/microcode branch of tip:

Commit-ID:     f4a21dcbdbfaaa6841d528e5124c581e90c945fe
Gitweb:        https://git.kernel.org/tip/f4a21dcbdbfaaa6841d528e5124c581e90c945fe
Author:        Thomas Gleixner <tglx@...utronix.de>
AuthorDate:    Mon, 02 Oct 2023 13:59:54 +02:00
Committer:     Borislav Petkov (AMD) <bp@...en8.de>
CommitterDate: Fri, 06 Oct 2023 15:12:19 +02:00

x86/microcode: Get rid of the schedule work indirection

Scheduling work on all CPUs to collect the microcode information is just
another extra step for no value. Let the CPU hotplug callback registration
do it.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Link: https://lore.kernel.org/r/20231002115902.971709581@linutronix.de
---
 arch/x86/kernel/cpu/microcode/core.c | 29 +++++++++------------------
 1 file changed, 10 insertions(+), 19 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index 6f7632f..17b7578 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -519,8 +519,16 @@ static int mc_cpu_starting(unsigned int cpu)
 
 static int mc_cpu_online(unsigned int cpu)
 {
+	struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
 	struct device *dev = get_cpu_device(cpu);
 
+	memset(uci, 0, sizeof(*uci));
+
+	microcode_ops->collect_cpu_info(cpu, &uci->cpu_sig);
+	cpu_data(cpu).microcode = uci->cpu_sig.rev;
+	if (!cpu)
+		boot_cpu_data.microcode = uci->cpu_sig.rev;
+
 	if (sysfs_create_group(&dev->kobj, &mc_attr_group))
 		pr_err("Failed to create group for CPU%d\n", cpu);
 	return 0;
@@ -541,20 +549,6 @@ static int mc_cpu_down_prep(unsigned int cpu)
 	return 0;
 }
 
-static void setup_online_cpu(struct work_struct *work)
-{
-	int cpu = smp_processor_id();
-	struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
-
-	memset(uci, 0, sizeof(*uci));
-
-	microcode_ops->collect_cpu_info(cpu, &uci->cpu_sig);
-	cpu_data(cpu).microcode = uci->cpu_sig.rev;
-	if (!cpu)
-		boot_cpu_data.microcode = uci->cpu_sig.rev;
-	mc_cpu_online(cpu);
-}
-
 static struct attribute *cpu_root_microcode_attrs[] = {
 #ifdef CONFIG_MICROCODE_LATE_LOADING
 	&dev_attr_reload.attr,
@@ -600,14 +594,11 @@ static int __init microcode_init(void)
 		}
 	}
 
-	/* Do per-CPU setup */
-	schedule_on_each_cpu(setup_online_cpu);
-
 	register_syscore_ops(&mc_syscore_ops);
 	cpuhp_setup_state_nocalls(CPUHP_AP_MICROCODE_LOADER, "x86/microcode:starting",
 				  mc_cpu_starting, NULL);
-	cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, "x86/microcode:online",
-				  mc_cpu_online, mc_cpu_down_prep);
+	cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "x86/microcode:online",
+			  mc_cpu_online, mc_cpu_down_prep);
 
 	pr_info("Microcode Update Driver: v%s.", DRIVER_VERSION);