linux-kernel - [RFC PATCH v1 13/70] x86, x2apic_cluster:

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Date:	Tue, 22 Jul 2014 21:58:49 -0400
From:	"Chen, Gong" <gong.chen@...ux.intel.com>
To:	linux-kernel@...r.kernel.org
Cc:	mingo@...nel.org, tglx@...utronix.de, paulus@...ba.org,
	benh@...nel.crashing.org, tony.luck@...el.com, hpa@...or.com,
	jkosina@...e.cz, rafael.j.wysocki@...el.com, bp@...en8.de,
	linux@....linux.org.uk, ralf@...ux-mips.org,
	schwidefsky@...ibm.com, davem@...emloft.net,
	viro@...iv.linux.org.uk, fweisbec@...il.com, cl@...ux.com,
	akpm@...ux-foundation.org, axboe@...nel.dk,
	JBottomley@...allels.com, neilb@...e.de,
	christoffer.dall@...aro.org, rostedt@...dmis.org, rric@...nel.org,
	gregkh@...uxfoundation.org, mhocko@...e.cz, david@...morbit.com,
	"Chen, Gong" <gong.chen@...ux.intel.com>
Subject: [RFC PATCH v1 13/70] x86, x2apic_cluster: _FROZEN Cleanup

Remove XXX_FROZEN state from x86/x2apic_cluster.

Signed-off-by: Chen, Gong <gong.chen@...ux.intel.com>
---
 arch/x86/kernel/apic/x2apic_cluster.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/apic/x2apic_cluster.c b/arch/x86/kernel/apic/x2apic_cluster.c
index e66766b..bfd2369 100644
--- a/arch/x86/kernel/apic/x2apic_cluster.c
+++ b/arch/x86/kernel/apic/x2apic_cluster.c
@@ -154,8 +154,11 @@ update_clusterinfo(struct notifier_block *nfb, unsigned long action, void *hcpu)
 	unsigned int cpu;
 	int err = 0;
 
-	switch (action) {
+	switch (action & ~CPU_TASKS_FROZEN) {
 	case CPU_UP_PREPARE:
+		if (action & CPU_TASKS_FROZEN)
+			break;
+
 		if (!zalloc_cpumask_var(&per_cpu(cpus_in_cluster, this_cpu),
 					GFP_KERNEL)) {
 			err = -ENOMEM;
@@ -165,9 +168,11 @@ update_clusterinfo(struct notifier_block *nfb, unsigned long action, void *hcpu)
 			err = -ENOMEM;
 		}
 		break;
-	case CPU_UP_CANCELED:
-	case CPU_UP_CANCELED_FROZEN:
 	case CPU_DEAD:
+		/* fall though to next if action == CPU_DEAD */
+		if (action & CPU_TASKS_FROZEN)
+			break;
+	case CPU_UP_CANCELED:
 		for_each_online_cpu(cpu) {
 			if (x2apic_cluster(this_cpu) != x2apic_cluster(cpu))
 				continue;
-- 
2.0.0.rc2

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