Merge branch 'x86-geode-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...

[pandora-kernel.git] / arch / x86 / mm / fault.c

diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 4d09df0..9c7378d 100644 (file)
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -17,6 +17,7 @@
 #include <asm/traps.h>                 /* dotraplinkage, ...           */
 #include <asm/pgalloc.h>               /* pgd_*(), ...                 */
 #include <asm/kmemcheck.h>             /* kmemcheck_*(), ...           */
+#include <asm/vsyscall.h>
 
 /*
  * Page fault error code bits:
@@ -105,7 +106,7 @@ check_prefetch_opcode(struct pt_regs *regs, unsigned char *instr,
                 * but for now it's good enough to assume that long
                 * mode only uses well known segments or kernel.
                 */
-               return (!user_mode(regs)) || (regs->cs == __USER_CS);
+               return (!user_mode(regs) || user_64bit_mode(regs));
 #endif
        case 0x60:
                /* 0x64 thru 0x67 are valid prefixes in all modes. */
@@ -419,12 +420,14 @@ static noinline __kprobes int vmalloc_fault(unsigned long address)
        return 0;
 }
 
+#ifdef CONFIG_CPU_SUP_AMD
 static const char errata93_warning[] =
 KERN_ERR 
 "******* Your BIOS seems to not contain a fix for K8 errata #93\n"
 "******* Working around it, but it may cause SEGVs or burn power.\n"
 "******* Please consider a BIOS update.\n"
 "******* Disabling USB legacy in the BIOS may also help.\n";
+#endif
 
 /*
  * No vm86 mode in 64-bit mode:
@@ -504,7 +507,11 @@ bad:
  */
 static int is_errata93(struct pt_regs *regs, unsigned long address)
 {
-#ifdef CONFIG_X86_64
+#if defined(CONFIG_X86_64) && defined(CONFIG_CPU_SUP_AMD)
+       if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD
+           || boot_cpu_data.x86 != 0xf)
+               return 0;
+
        if (address != regs->ip)
                return 0;
 
@@ -720,6 +727,18 @@ __bad_area_nosemaphore(struct pt_regs *regs, unsigned long error_code,
                if (is_errata100(regs, address))
                        return;
 
+#ifdef CONFIG_X86_64
+               /*
+                * Instruction fetch faults in the vsyscall page might need
+                * emulation.
+                */
+               if (unlikely((error_code & PF_INSTR) &&
+                            ((address & ~0xfff) == VSYSCALL_START))) {
+                       if (emulate_vsyscall(regs, address))
+                               return;
+               }
+#endif
+
                if (unlikely(show_unhandled_signals))
                        show_signal_msg(regs, error_code, address, tsk);