[PATCH V2 2/2] x86, mce, severities: Define mce_severity function pointer

[Aravind Gopalakrishnan <Aravind.Gopalakrishnan@amd.com>]

Rename mce_severity() as mce_severity_intel and assign mce_severity
function pointer to either one of mce_severity_intel or
mce_severity_amd during init depending on which processor we are on.

This way, we can avoid a test to call mce_severity_amd every time we
get into mce_severity(). And it's cleaner to do it this way.

Suggested-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Aravind Gopalakrishnan <Aravind.Gopalakrishnan@amd.com>
---
 arch/x86/include/asm/mce.h                |  2 ++
 arch/x86/kernel/cpu/mcheck/mce-internal.h |  3 ++-
 arch/x86/kernel/cpu/mcheck/mce-severity.c | 35 ++++++++++++++++++++++++++-----
 arch/x86/kernel/cpu/mcheck/mce.c          |  1 +
 4 files changed, 35 insertions(+), 6 deletions(-)

diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h
index b574fbf..1f5a86d 100644
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -134,9 +134,11 @@ extern int mce_p5_enabled;
 #ifdef CONFIG_X86_MCE
 int mcheck_init(void);
 void mcheck_cpu_init(struct cpuinfo_x86 *c);
+void mcheck_vendor_init_severity(void);
 #else
 static inline int mcheck_init(void) { return 0; }
 static inline void mcheck_cpu_init(struct cpuinfo_x86 *c) {}
+static inline void mcheck_vendor_init_severity(void) {}
 #endif
 
 #ifdef CONFIG_X86_ANCIENT_MCE
diff --git a/arch/x86/kernel/cpu/mcheck/mce-internal.h b/arch/x86/kernel/cpu/mcheck/mce-internal.h
index e12f0bf..4758f5f 100644
--- a/arch/x86/kernel/cpu/mcheck/mce-internal.h
+++ b/arch/x86/kernel/cpu/mcheck/mce-internal.h
@@ -24,7 +24,8 @@ struct mce_bank {
 	char			attrname[ATTR_LEN];	/* attribute name */
 };
 
-int mce_severity(struct mce *a, int tolerant, char **msg, bool is_excp);
+extern int (*mce_severity)(struct mce *a, int tolerant,
+			    char **msg, bool is_excp);
 struct dentry *mce_get_debugfs_dir(void);
 
 extern struct mce_bank *mce_banks;
diff --git a/arch/x86/kernel/cpu/mcheck/mce-severity.c b/arch/x86/kernel/cpu/mcheck/mce-severity.c
index 4f8f87d..683a06f 100644
--- a/arch/x86/kernel/cpu/mcheck/mce-severity.c
+++ b/arch/x86/kernel/cpu/mcheck/mce-severity.c
@@ -187,7 +187,8 @@ static int error_context(struct mce *m)
 }
 
 /* keeping mce_severity_amd in sync with AMD error scope heirarchy table */
-static int mce_severity_amd(struct mce *m, enum context ctx)
+static int mce_severity_amd(struct mce *m, int tolerant,
+			    char **msg, bool is_excp)
 {
 	enum context ctx = error_context(m);
 	/* Processor Context Corrupt, no need to fumble too much, die! */
@@ -236,15 +237,13 @@ static int mce_severity_amd(struct mce *m, enum context ctx)
 	return MCE_KEEP_SEVERITY;
 }
 
-int mce_severity(struct mce *m, int tolerant, char **msg, bool is_excp)
+static int mce_severity_intel(struct mce *m, int tolerant,
+			      char **msg, bool is_excp)
 {
 	enum exception excp = (is_excp ? EXCP_CONTEXT : NO_EXCP);
 	enum context ctx = error_context(m);
 	struct severity *s;
 
-	if (m->cpuvendor == X86_VENDOR_AMD)
-		return mce_severity_amd(m, ctx);
-
 	for (s = severities;; s++) {
 		if ((m->status & s->mask) != s->result)
 			continue;
@@ -269,6 +268,32 @@ int mce_severity(struct mce *m, int tolerant, char **msg, bool is_excp)
 	}
 }
 
+static int mce_severity_default(struct mce *m, int tolerant,
+				char **msg, bool is_excp)
+{
+	return MCE_PANIC_SEVERITY;
+}
+
+int (*mce_severity)(struct mce *m, int tolerant, char **msg, bool is_excp) =
+		    mce_severity_default;
+
+void __init mcheck_vendor_init_severity(void)
+{
+	struct cpuinfo_x86 *c = &boot_cpu_data;
+
+	switch (c->x86_vendor) {
+	case X86_VENDOR_INTEL:
+		mce_severity = mce_severity_intel;
+		break;
+	case X86_VENDOR_AMD:
+		mce_severity = mce_severity_amd;
+		break;
+	default:
+		WARN_ONCE(1, "WTF!?");
+		break;
+	}
+}
+
 #ifdef CONFIG_DEBUG_FS
 static void *s_start(struct seq_file *f, loff_t *pos)
 {
diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 680cfb2..f22e76f 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -2030,6 +2030,7 @@ __setup("mce", mcheck_enable);
 int __init mcheck_init(void)
 {
 	mcheck_intel_therm_init();
+	mcheck_vendor_init_severity();
 
 	return 0;
 }
-- 
1.9.1