From: Benjamin LaHaise <bcrl@kvack.org>
Date: Wed, 11 Jan 2006 21:43:03 +0000 (+0100)
Subject: [PATCH] x86_64: another mb() for smpboot.c
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=f2ecfab91c6f248cf71dff66c2111d31c8cc1747;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

[PATCH] x86_64: another mb() for smpboot.c

The following is probably a good idea given that the atomic_set() isn't
a barrier here either.

Signed-off-by: Benjamin LaHaise <benjamin.c.lahaise@intel.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/arch/x86_64/kernel/smpboot.c b/arch/x86_64/kernel/smpboot.c
index 043b1d262a30..f513dacc177f 100644
--- a/arch/x86_64/kernel/smpboot.c
+++ b/arch/x86_64/kernel/smpboot.c
@@ -646,6 +646,7 @@ static int __cpuinit wakeup_secondary_via_INIT(int phys_apicid, unsigned int sta
 		send_status = apic_read(APIC_ICR) & APIC_ICR_BUSY;
 	} while (send_status && (timeout++ < 1000));
 
+	mb();
 	atomic_set(&init_deasserted, 1);
 
 	num_starts = 2;