linux-kernel - [PATCH 17/79] [PATCH] add barriers statement

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Message-Id: <12059476531095-git-send-email-gcosta@redhat.com>
Date:	Wed, 19 Mar 2008 14:25:12 -0300
From:	Glauber de Oliveira Costa <gcosta@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	akpm@...ux-foundation.org, tglx@...utronix.de, mingo@...e.hu,
	ak@...e.de, Glauber Costa <gcosta@...hat.com>
Subject: [PATCH 17/79] [PATCH] add barriers statement

goal is to have i386 and x86_64 closer, so we
add barriers to match

Signed-off-by: Glauber Costa <gcosta@...hat.com>
---
 arch/x86/kernel/smpboot_32.c |    4 ++++
 arch/x86/kernel/smpboot_64.c |    1 +
 2 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/smpboot_32.c b/arch/x86/kernel/smpboot_32.c
index 4e5416e..a232f4d 100644
--- a/arch/x86/kernel/smpboot_32.c
+++ b/arch/x86/kernel/smpboot_32.c
@@ -180,6 +180,9 @@ static void __cpuinit start_secondary(void *unused)
 	smp_callin();
 	while (!cpu_isset(smp_processor_id(), smp_commenced_mask))
 		cpu_relax();
+
+	/* otherwise gcc will move up smp_processor_id before the cpu_init */
+	barrier();
 	/*
 	 * Check TSC synchronization with the BP:
 	 */
@@ -432,6 +435,7 @@ wakeup_secondary_cpu(int phys_apicid, unsigned long start_eip)
 	Dprintk("Waiting for send to finish...\n");
 	send_status = safe_apic_wait_icr_idle();
 
+	mb();
 	atomic_set(&init_deasserted, 1);
 
 	/*
diff --git a/arch/x86/kernel/smpboot_64.c b/arch/x86/kernel/smpboot_64.c
index d7b59d6..a9cc911 100644
--- a/arch/x86/kernel/smpboot_64.c
+++ b/arch/x86/kernel/smpboot_64.c
@@ -239,6 +239,7 @@ void __cpuinit start_secondary(void)
 
 	setup_secondary_clock();
 
+	wmb();
 	cpu_idle();
 }
 
-- 
1.5.0.6

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