linux-kernel - [RFC PATCH 2/4] x86, cpu: Convert F00F bug detection

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Date:	Mon, 11 Feb 2013 12:18:39 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	X86 ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
	Borislav Petkov <bp@...e.de>
Subject: [RFC PATCH 2/4] x86, cpu: Convert F00F bug detection

From: Borislav Petkov <bp@...e.de>

... to using the new facility and drop the cpuinfo_x86 member.

Signed-off-by: Borislav Petkov <bp@...e.de>
---
 arch/x86/include/asm/cpufeature.h | 2 ++
 arch/x86/include/asm/processor.h  | 1 -
 arch/x86/kernel/cpu/intel.c       | 4 ++--
 arch/x86/kernel/cpu/proc.c        | 2 +-
 arch/x86/mm/fault.c               | 2 +-
 5 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
index 68daf877dad5..22107c57c0e4 100644
--- a/arch/x86/include/asm/cpufeature.h
+++ b/arch/x86/include/asm/cpufeature.h
@@ -216,6 +216,8 @@
 #define X86_FEATURE_ADX		(9*32+19) /* The ADCX and ADOX instructions */
 #define X86_FEATURE_SMAP	(9*32+20) /* Supervisor Mode Access Prevention */
 
+#define X86_BUG_F00F		(NCAPINTS*32+ 0) /* Intel F00F bug */
+
 #if defined(__KERNEL__) && !defined(__ASSEMBLY__)
 
 #include <asm/asm.h>
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 67721c634bf0..60b21f132ae4 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -93,7 +93,6 @@ struct cpuinfo_x86 {
 	char			hard_math;
 	char			rfu;
 	char			fdiv_bug;
-	char			f00f_bug;
 	char			coma_bug;
 	char			pad0;
 #else
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index 1905ce98bee0..1acdd42d86d1 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -209,11 +209,11 @@ static void __cpuinit intel_workarounds(struct cpuinfo_x86 *c)
 	 * system.
 	 * Note that the workaround only should be initialized once...
 	 */
-	c->f00f_bug = 0;
+	clear_cpu_bug(c, X86_BUG_F00F);
 	if (!paravirt_enabled() && c->x86 == 5) {
 		static int f00f_workaround_enabled;
 
-		c->f00f_bug = 1;
+		set_cpu_bug(c, X86_BUG_F00F);
 		if (!f00f_workaround_enabled) {
 			trap_init_f00f_bug();
 			printk(KERN_NOTICE "Intel Pentium with F0 0F bug - workaround enabled.\n");
diff --git a/arch/x86/kernel/cpu/proc.c b/arch/x86/kernel/cpu/proc.c
index 3286a92e662a..debb8826589b 100644
--- a/arch/x86/kernel/cpu/proc.c
+++ b/arch/x86/kernel/cpu/proc.c
@@ -37,7 +37,7 @@ static void show_cpuinfo_misc(struct seq_file *m, struct cpuinfo_x86 *c)
 		   "wp\t\t: %s\n",
 		   c->fdiv_bug ? "yes" : "no",
 		   c->hlt_works_ok ? "no" : "yes",
-		   c->f00f_bug ? "yes" : "no",
+		   static_cpu_has_bug(X86_BUG_F00F) ? "yes" : "no",
 		   c->coma_bug ? "yes" : "no",
 		   c->hard_math ? "yes" : "no",
 		   c->hard_math ? "yes" : "no",
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index fb674fd3fc22..aaaf6931ff0b 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -555,7 +555,7 @@ static int is_f00f_bug(struct pt_regs *regs, unsigned long address)
 	/*
 	 * Pentium F0 0F C7 C8 bug workaround:
 	 */
-	if (boot_cpu_data.f00f_bug) {
+	if (boot_cpu_has_bug(X86_BUG_F00F)) {
 		nr = (address - idt_descr.address) >> 3;
 
 		if (nr == 6) {
-- 
1.8.1.3.535.ga923c31

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