linux-kernel - [tip:x86/urgent] x86/espfix: Add 'cpu' parameter to init_espfix

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Message-ID: <tip-1db875631f8d5bbf497f67e47f254eece888d51d@git.kernel.org>
Date:	Mon, 6 Jul 2015 08:38:46 -0700
From:	tip-bot for Zhu Guihua <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	luto@...nel.org, peterz@...radead.org,
	torvalds@...ux-foundation.org, hpa@...or.com,
	zhugh.fnst@...fujitsu.com, bp@...en8.de,
	linux-kernel@...r.kernel.org, mingo@...nel.org,
	luto@...capital.net, tglx@...utronix.de
Subject: [tip:x86/urgent] x86/espfix: Add 'cpu'
  parameter to init_espfix_ap()

Commit-ID:  1db875631f8d5bbf497f67e47f254eece888d51d
Gitweb:     http://git.kernel.org/tip/1db875631f8d5bbf497f67e47f254eece888d51d
Author:     Zhu Guihua <zhugh.fnst@...fujitsu.com>
AuthorDate: Fri, 3 Jul 2015 17:37:18 +0800
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 6 Jul 2015 15:00:33 +0200

x86/espfix: Add 'cpu' parameter to init_espfix_ap()

Add a CPU index parameter to init_espfix_ap(), so that the
parameter could be propagated to the function for espfix
page allocation.

Signed-off-by: Zhu Guihua <zhugh.fnst@...fujitsu.com>
Cc: <bp@...en8.de>
Cc: <luto@...capital.net>
Cc: <luto@...nel.org>
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/cde3fcf1b3211f3f03feb1a995bce3fee850f0fc.1435824469.git.zhugh.fnst@cn.fujitsu.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/include/asm/espfix.h | 2 +-
 arch/x86/kernel/espfix_64.c   | 7 +++----
 arch/x86/kernel/smpboot.c     | 2 +-
 3 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/arch/x86/include/asm/espfix.h b/arch/x86/include/asm/espfix.h
index 99efebb..ca3ce9a 100644
--- a/arch/x86/include/asm/espfix.h
+++ b/arch/x86/include/asm/espfix.h
@@ -9,7 +9,7 @@ DECLARE_PER_CPU_READ_MOSTLY(unsigned long, espfix_stack);
 DECLARE_PER_CPU_READ_MOSTLY(unsigned long, espfix_waddr);
 
 extern void init_espfix_bsp(void);
-extern void init_espfix_ap(void);
+extern void init_espfix_ap(int cpu);
 
 #endif /* CONFIG_X86_64 */
 
diff --git a/arch/x86/kernel/espfix_64.c b/arch/x86/kernel/espfix_64.c
index f5d0730..1fb0e00 100644
--- a/arch/x86/kernel/espfix_64.c
+++ b/arch/x86/kernel/espfix_64.c
@@ -131,12 +131,12 @@ void __init init_espfix_bsp(void)
 	init_espfix_random();
 
 	/* The rest is the same as for any other processor */
-	init_espfix_ap();
+	init_espfix_ap(0);
 }
 
-void init_espfix_ap(void)
+void init_espfix_ap(int cpu)
 {
-	unsigned int cpu, page;
+	unsigned int page;
 	unsigned long addr;
 	pud_t pud, *pud_p;
 	pmd_t pmd, *pmd_p;
@@ -149,7 +149,6 @@ void init_espfix_ap(void)
 	if (likely(this_cpu_read(espfix_stack)))
 		return;		/* Already initialized */
 
-	cpu = smp_processor_id();
 	addr = espfix_base_addr(cpu);
 	page = cpu/ESPFIX_STACKS_PER_PAGE;
 
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 8add66b..6f5abac 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -242,7 +242,7 @@ static void notrace start_secondary(void *unused)
 	 * Enable the espfix hack for this CPU
 	 */
 #ifdef CONFIG_X86_ESPFIX64
-	init_espfix_ap();
+	init_espfix_ap(smp_processor_id());
 #endif
 
 	/*
--
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