x86, mce: don't disable machine checks during code patching

[pandora-kernel.git] / arch / x86 / kernel / cpu / mcheck / mce_64.c

diff --git a/arch/x86/kernel/cpu/mcheck/mce_64.c b/arch/x86/kernel/cpu/mcheck/mce_64.c
index 1c83803..25ccdbe 100644 (file)
--- a/arch/x86/kernel/cpu/mcheck/mce_64.c
+++ b/arch/x86/kernel/cpu/mcheck/mce_64.c
@@ -295,11 +295,11 @@ void do_machine_check(struct pt_regs * regs, long error_code)
                 * If we know that the error was in user space, send a
                 * SIGBUS.  Otherwise, panic if tolerance is low.
                 *
-                * do_exit() takes an awful lot of locks and has a slight
+                * force_sig() takes an awful lot of locks and has a slight
                 * risk of deadlocking.
                 */
                if (user_space) {
-                       do_exit(SIGBUS);
+                       force_sig(SIGBUS, current);
                } else if (panic_on_oops || tolerant < 2) {
                        mce_panic("Uncorrected machine check",
                                &panicm, mcestart);
@@ -680,20 +680,6 @@ static struct miscdevice mce_log_device = {
        &mce_chrdev_ops,
 };
 
-static unsigned long old_cr4 __initdata;
-
-void __init stop_mce(void)
-{
-       old_cr4 = read_cr4();
-       clear_in_cr4(X86_CR4_MCE);
-}
-
-void __init restart_mce(void)
-{
-       if (old_cr4 & X86_CR4_MCE)
-               set_in_cr4(X86_CR4_MCE);
-}
-
 /*
  * Old style boot options parsing. Only for compatibility.
  */
@@ -728,12 +714,36 @@ __setup("mce=", mcheck_enable);
  * Sysfs support
  */
 
+/*
+ * Disable machine checks on suspend and shutdown. We can't really handle
+ * them later.
+ */
+static int mce_disable(void)
+{
+       int i;
+
+       for (i = 0; i < banks; i++)
+               wrmsrl(MSR_IA32_MC0_CTL + i*4, 0);
+       return 0;
+}
+
+static int mce_suspend(struct sys_device *dev, pm_message_t state)
+{
+       return mce_disable();
+}
+
+static int mce_shutdown(struct sys_device *dev)
+{
+       return mce_disable();
+}
+
 /* On resume clear all MCE state. Don't want to see leftovers from the BIOS.
    Only one CPU is active at this time, the others get readded later using
    CPU hotplug. */
 static int mce_resume(struct sys_device *dev)
 {
        mce_init(NULL);
+       mce_cpu_features(&current_cpu_data);
        return 0;
 }
 
@@ -751,6 +761,8 @@ static void mce_restart(void)
 }
 
 static struct sysdev_class mce_sysclass = {
+       .suspend = mce_suspend,
+       .shutdown = mce_shutdown,
        .resume = mce_resume,
        .name = "machinecheck",
 };