Merge tag 'r8169-20060920-00' of git://electric-eye.fr.zoreil.com/home/romieu/linux...

[pandora-kernel.git] / arch / x86_64 / kernel / time.c

diff --git a/arch/x86_64/kernel/time.c b/arch/x86_64/kernel/time.c
index b9ff759..7a9b182 100644 (file)
--- a/arch/x86_64/kernel/time.c
+++ b/arch/x86_64/kernel/time.c
@@ -28,6 +28,7 @@
 #include <linux/acpi.h>
 #ifdef CONFIG_ACPI
 #include <acpi/achware.h>      /* for PM timer frequency */
+#include <acpi/acpi_bus.h>
 #endif
 #include <asm/8253pit.h>
 #include <asm/pgtable.h>
@@ -193,7 +194,7 @@ unsigned long profile_pc(struct pt_regs *regs)
           is just accounted to the spinlock function.
           Better would be to write these functions in assembler again
           and check exactly. */
-       if (in_lock_functions(pc)) {
+       if (!user_mode(regs) && in_lock_functions(pc)) {
                char *v = *(char **)regs->rsp;
                if ((v >= _stext && v <= _etext) ||
                        (v >= _sinittext && v <= _einittext) ||
@@ -953,11 +954,18 @@ __cpuinit int unsynchronized_tsc(void)
 #ifdef CONFIG_SMP
        if (apic_is_clustered_box())
                return 1;
-       /* Intel systems are normally all synchronized. Exceptions
-          are handled in the check above. */
-       if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
-               return 0;
 #endif
+       /* Most intel systems have synchronized TSCs except for
+          multi node systems */
+       if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) {
+#ifdef CONFIG_ACPI
+               /* But TSC doesn't tick in C3 so don't use it there */
+               if (acpi_fadt.length > 0 && acpi_fadt.plvl3_lat < 100)
+                       return 1;
+#endif
+               return 0;
+       }
+
        /* Assume multi socket systems are not synchronized */
        return num_present_cpus() > 1;
 }