linux-kernel - [tip:ras/core] x86/mce: Don't use percpu workqueues

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Date:	Thu, 13 Aug 2015 03:46:43 -0700
From:	"tip-bot for Chen, Gong" <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	gong.chen@...ux.intel.com, mingo@...nel.org, tony.luck@...el.com,
	linux-kernel@...r.kernel.org, hpa@...or.com, peterz@...radead.org,
	torvalds@...ux-foundation.org, tglx@...utronix.de, bp@...e.de
Subject: [tip:ras/core] x86/mce: Don't use percpu workqueues

Commit-ID:  061120aed7081b9a4393fbe07b558192f40ad911
Gitweb:     http://git.kernel.org/tip/061120aed7081b9a4393fbe07b558192f40ad911
Author:     Chen, Gong <gong.chen@...ux.intel.com>
AuthorDate: Wed, 12 Aug 2015 18:29:35 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 13 Aug 2015 10:12:51 +0200

x86/mce: Don't use percpu workqueues

An MCE is a rare event. Therefore, there's no need to have
per-CPU instances of both normal and IRQ workqueues. Make them
both global.

Signed-off-by: Chen, Gong <gong.chen@...ux.intel.com>
[ Fold in subsequent patch from Rui/Boris/Tony for early boot logging. ]
Signed-off-by: Tony Luck <tony.luck@...el.com>
[ Massage commit message. ]
Signed-off-by: Borislav Petkov <bp@...e.de>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/1439396985-12812-4-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/cpu/mcheck/mce.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index a41c014..456f8d7 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -110,7 +110,8 @@ DEFINE_PER_CPU(mce_banks_t, mce_poll_banks) = {
  */
 mce_banks_t mce_banks_ce_disabled;
 
-static DEFINE_PER_CPU(struct work_struct, mce_work);
+static struct work_struct mce_work;
+static struct irq_work mce_irq_work;
 
 static void (*quirk_no_way_out)(int bank, struct mce *m, struct pt_regs *regs);
 
@@ -526,11 +527,9 @@ int mce_available(struct cpuinfo_x86 *c)
 static void mce_schedule_work(void)
 {
 	if (!mce_ring_empty())
-		schedule_work(this_cpu_ptr(&mce_work));
+		schedule_work(&mce_work);
 }
 
-static DEFINE_PER_CPU(struct irq_work, mce_irq_work);
-
 static void mce_irq_work_cb(struct irq_work *entry)
 {
 	mce_notify_irq();
@@ -551,7 +550,7 @@ static void mce_report_event(struct pt_regs *regs)
 		return;
 	}
 
-	irq_work_queue(this_cpu_ptr(&mce_irq_work));
+	irq_work_queue(&mce_irq_work);
 }
 
 /*
@@ -1742,8 +1741,6 @@ void mcheck_cpu_init(struct cpuinfo_x86 *c)
 	__mcheck_cpu_init_generic();
 	__mcheck_cpu_init_vendor(c);
 	__mcheck_cpu_init_timer();
-	INIT_WORK(this_cpu_ptr(&mce_work), mce_process_work);
-	init_irq_work(this_cpu_ptr(&mce_irq_work), &mce_irq_work_cb);
 }
 
 /*
@@ -2064,6 +2061,9 @@ int __init mcheck_init(void)
 	mcheck_intel_therm_init();
 	mcheck_vendor_init_severity();
 
+	INIT_WORK(&mce_work, mce_process_work);
+	init_irq_work(&mce_irq_work, mce_irq_work_cb);
+
 	return 0;
 }
 
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