x86/mce: Cleanup mce_usable_address()

Move Intel-specific checks into a helper function.

Explicitly use "bool" for return type.

No functional change intended.

Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230613141142.36801-4-yazen.ghannam@amd.com

diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h
index 180b1cb..6de6e1d 100644 (file)
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -245,7 +245,7 @@ static inline void cmci_recheck(void) {}
 int mce_available(struct cpuinfo_x86 *c);
 bool mce_is_memory_error(struct mce *m);
 bool mce_is_correctable(struct mce *m);
-int mce_usable_address(struct mce *m);
+bool mce_usable_address(struct mce *m);
 
 DECLARE_PER_CPU(unsigned, mce_exception_count);
 DECLARE_PER_CPU(unsigned, mce_poll_count);

diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c
index 06c21f5..0214d42 100644 (file)
--- a/arch/x86/kernel/cpu/mce/core.c
+++ b/arch/x86/kernel/cpu/mce/core.c
@@ -453,35 +453,22 @@ static void mce_irq_work_cb(struct irq_work *entry)
        mce_schedule_work();
 }
 
-/*
- * Check if the address reported by the CPU is in a format we can parse.
- * It would be possible to add code for most other cases, but all would
- * be somewhat complicated (e.g. segment offset would require an instruction
- * parser). So only support physical addresses up to page granularity for now.
- */
-int mce_usable_address(struct mce *m)
+bool mce_usable_address(struct mce *m)
 {
        if (!(m->status & MCI_STATUS_ADDRV))
-               return 0;
+               return false;
 
-       if (m->cpuvendor == X86_VENDOR_AMD)
+       switch (m->cpuvendor) {
+       case X86_VENDOR_AMD:
                return amd_mce_usable_address(m);
 
-       /* Checks after this one are Intel/Zhaoxin-specific: */
-       if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL &&
-           boot_cpu_data.x86_vendor != X86_VENDOR_ZHAOXIN)
-               return 1;
-
-       if (!(m->status & MCI_STATUS_MISCV))
-               return 0;
-
-       if (MCI_MISC_ADDR_LSB(m->misc) > PAGE_SHIFT)
-               return 0;
-
-       if (MCI_MISC_ADDR_MODE(m->misc) != MCI_MISC_ADDR_PHYS)
-               return 0;
+       case X86_VENDOR_INTEL:
+       case X86_VENDOR_ZHAOXIN:
+               return intel_mce_usable_address(m);
 
-       return 1;
+       default:
+               return true;
+       }
 }
 EXPORT_SYMBOL_GPL(mce_usable_address);
 

diff --git a/arch/x86/kernel/cpu/mce/intel.c b/arch/x86/kernel/cpu/mce/intel.c
index f532355..52bce53 100644 (file)
--- a/arch/x86/kernel/cpu/mce/intel.c
+++ b/arch/x86/kernel/cpu/mce/intel.c
@@ -536,3 +536,23 @@ bool intel_filter_mce(struct mce *m)
 
        return false;
 }
+
+/*
+ * Check if the address reported by the CPU is in a format we can parse.
+ * It would be possible to add code for most other cases, but all would
+ * be somewhat complicated (e.g. segment offset would require an instruction
+ * parser). So only support physical addresses up to page granularity for now.
+ */
+bool intel_mce_usable_address(struct mce *m)
+{
+       if (!(m->status & MCI_STATUS_MISCV))
+               return false;
+
+       if (MCI_MISC_ADDR_LSB(m->misc) > PAGE_SHIFT)
+               return false;
+
+       if (MCI_MISC_ADDR_MODE(m->misc) != MCI_MISC_ADDR_PHYS)
+               return false;
+
+       return true;
+}

diff --git a/arch/x86/kernel/cpu/mce/internal.h b/arch/x86/kernel/cpu/mce/internal.h
index a191554..e13a26c 100644 (file)
--- a/arch/x86/kernel/cpu/mce/internal.h
+++ b/arch/x86/kernel/cpu/mce/internal.h
@@ -49,6 +49,7 @@ void intel_init_cmci(void);
 void intel_init_lmce(void);
 void intel_clear_lmce(void);
 bool intel_filter_mce(struct mce *m);
+bool intel_mce_usable_address(struct mce *m);
 #else
 # define cmci_intel_adjust_timer mce_adjust_timer_default
 static inline bool mce_intel_cmci_poll(void) { return false; }
@@ -58,6 +59,7 @@ static inline void intel_init_cmci(void) { }
 static inline void intel_init_lmce(void) { }
 static inline void intel_clear_lmce(void) { }
 static inline bool intel_filter_mce(struct mce *m) { return false; }
+static inline bool intel_mce_usable_address(struct mce *m) { return false; }
 #endif
 
 void mce_timer_kick(unsigned long interval);