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[11/22] arm64: Populate cpuinfo after notify_cpu_starting

Message ID 1442413280-31885-12-git-send-email-suzuki.poulose@arm.com (mailing list archive)
State New, archived
Headers show

Commit Message

Suzuki K Poulose Sept. 16, 2015, 2:21 p.m. UTC 
From: "Suzuki K. Poulose" <suzuki.poulose@arm.com>

This patch delays populating the cpuinfo for a new (hotplugged)
CPU until the notifiers have executed. This will enable us to verify
if the new (hotplugged) CPU has all the capabilities which the system
already has. If it doesn't, we could prevent it from turning online and
also modifying the system wide feature register status.

Signed-off-by: Suzuki K. Poulose <suzuki.poulose@arm.com>
---
 arch/arm64/kernel/smp.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
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Patch

diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index cb3e0d8..6987de4 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -163,14 +163,14 @@  asmlinkage void secondary_start_kernel(void)
 		cpu_ops[cpu]->cpu_postboot();
 
 	/*
-	 * Log the CPU info before it is marked online and might get read.
+	 * Enable GIC and timers.
 	 */
-	cpuinfo_store_cpu();
+	notify_cpu_starting(cpu);
 
 	/*
-	 * Enable GIC and timers.
+	 * Log the CPU info before it is marked online and might get read.
 	 */
-	notify_cpu_starting(cpu);
+	cpuinfo_store_cpu();
 
 	smp_store_cpu_info(cpu);