linux-kernel - [PATCH] i386: some MCE cleanups

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Date:	Mon,  8 Oct 2007 15:58:39 +0200
From:	"Joerg Roedel" <joerg.roedel@....com>
To:	linux-kernel@...r.kernel.org
cc:	"Joerg Roedel" <joerg.roedel@....com>,
	"Christoph Egger" <christoph.egger@....com>
Subject: [PATCH] i386: some MCE cleanups

MCG_CAP never reports a negative count of available error-reporting
banks. Make it unsigned.
Check for MCA/MCE feature bits as early as possible.  While here, do an
indent cleanup.

Signed-off-by: Christoph Egger <christoph.egger@....com>
Signed-off-by: Joerg Roedel <joerg.roedel@....com>
---
 arch/i386/kernel/cpu/mcheck/mce.c |   57 ++++++++++++++++++++++--------------
 arch/i386/kernel/cpu/mcheck/mce.h |    2 +-
 2 files changed, 36 insertions(+), 23 deletions(-)

diff --git a/arch/i386/kernel/cpu/mcheck/mce.c b/arch/i386/kernel/cpu/mcheck/mce.c
index 34c781e..2eb72ad 100644
--- a/arch/i386/kernel/cpu/mcheck/mce.c
+++ b/arch/i386/kernel/cpu/mcheck/mce.c
@@ -17,7 +17,7 @@
 #include "mce.h"
 
 int mce_disabled = 0;
-int nr_mce_banks;
+unsigned int nr_mce_banks;
 
 EXPORT_SYMBOL_GPL(nr_mce_banks);	/* non-fatal.o */
 
@@ -33,30 +33,43 @@ void fastcall (*machine_check_vector)(struct pt_regs *, long error_code) = unexp
 /* This has to be run for each processor */
 void mcheck_init(struct cpuinfo_x86 *c)
 {
-	if (mce_disabled==1)
+	uint32_t mca, mce;
+
+	if (mce_disabled == 1) {
+		printk("MCE support disabled by bootparam\n");
+		return;
+	}
+
+	mca = cpu_has(c, X86_FEATURE_MCA);
+	mce = cpu_has(c, X86_FEATURE_MCE);
+
+	if (!mca || !mce) {
+		printk(KERN_INFO "CPU%i: No machine check support available\n",
+			smp_processor_id());
 		return;
+	}
 
 	switch (c->x86_vendor) {
-		case X86_VENDOR_AMD:
-			amd_mcheck_init(c);
-			break;
-
-		case X86_VENDOR_INTEL:
-			if (c->x86==5)
-				intel_p5_mcheck_init(c);
-			if (c->x86==6)
-				intel_p6_mcheck_init(c);
-			if (c->x86==15)
-				intel_p4_mcheck_init(c);
-			break;
-
-		case X86_VENDOR_CENTAUR:
-			if (c->x86==5)
-				winchip_mcheck_init(c);
-			break;
-
-		default:
-			break;
+	case X86_VENDOR_AMD:
+		amd_mcheck_init(c);
+		break;
+
+	case X86_VENDOR_INTEL:
+		if (c->x86==5)
+			intel_p5_mcheck_init(c);
+		if (c->x86==6)
+		intel_p6_mcheck_init(c);
+		if (c->x86==15)
+			intel_p4_mcheck_init(c);
+		break;
+
+	case X86_VENDOR_CENTAUR:
+		if (c->x86==5)
+			winchip_mcheck_init(c);
+		break;
+
+	default:
+		break;
 	}
 }
 
diff --git a/arch/i386/kernel/cpu/mcheck/mce.h b/arch/i386/kernel/cpu/mcheck/mce.h
index 81fb6e2..9cbe812 100644
--- a/arch/i386/kernel/cpu/mcheck/mce.h
+++ b/arch/i386/kernel/cpu/mcheck/mce.h
@@ -10,5 +10,5 @@ void winchip_mcheck_init(struct cpuinfo_x86 *c);
 /* Call the installed machine check handler for this CPU setup. */
 extern fastcall void (*machine_check_vector)(struct pt_regs *, long error_code);
 
-extern int nr_mce_banks;
+extern unsigned int nr_mce_banks;
 
-- 
1.5.1.6



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