xen: fix xen_flush_tlb_others

[safe/jmp/linux-2.6] / arch / x86 / kernel / traps.c

diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index c320c29..bde57f0 100644 (file)
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -20,7 +20,6 @@
 #include <linux/module.h>
 #include <linux/ptrace.h>
 #include <linux/string.h>
-#include <linux/unwind.h>
 #include <linux/delay.h>
 #include <linux/errno.h>
 #include <linux/kexec.h>
@@ -51,30 +50,22 @@
 #include <asm/debugreg.h>
 #include <asm/atomic.h>
 #include <asm/system.h>
-#include <asm/unwind.h>
 #include <asm/traps.h>
 #include <asm/desc.h>
 #include <asm/i387.h>
 
-#include <mach_traps.h>
+#include <asm/mach_traps.h>
 
 #ifdef CONFIG_X86_64
 #include <asm/pgalloc.h>
 #include <asm/proto.h>
-#include <asm/pda.h>
 #else
 #include <asm/processor-flags.h>
 #include <asm/arch_hooks.h>
-#include <asm/nmi.h>
-#include <asm/smp.h>
-#include <asm/io.h>
 #include <asm/traps.h>
 
 #include "cpu/mcheck/mce.h"
 
-DECLARE_BITMAP(used_vectors, NR_VECTORS);
-EXPORT_SYMBOL_GPL(used_vectors);
-
 asmlinkage int system_call(void);
 
 /* Do we ignore FPU interrupts ? */
@@ -89,6 +80,9 @@ gate_desc idt_table[256]
        __attribute__((__section__(".data.idt"))) = { { { { 0, 0 } } }, };
 #endif
 
+DECLARE_BITMAP(used_vectors, NR_VECTORS);
+EXPORT_SYMBOL_GPL(used_vectors);
+
 static int ignore_nmis;
 
 static inline void conditional_sti(struct pt_regs *regs)
@@ -292,8 +286,10 @@ dotraplinkage void do_double_fault(struct pt_regs *regs, long error_code)
        tsk->thread.error_code = error_code;
        tsk->thread.trap_no = 8;
 
-       /* This is always a kernel trap and never fixable (and thus must
-          never return). */
+       /*
+        * This is always a kernel trap and never fixable (and thus must
+        * never return).
+        */
        for (;;)
                die(str, regs, error_code);
 }
@@ -481,11 +477,7 @@ do_nmi(struct pt_regs *regs, long error_code)
 {
        nmi_enter();
 
-#ifdef CONFIG_X86_32
-       { int cpu; cpu = smp_processor_id(); ++nmi_count(cpu); }
-#else
-       add_pda(__nmi_count, 1);
-#endif
+       inc_irq_stat(__nmi_count);
 
        if (!ignore_nmis)
                default_do_nmi(regs);
@@ -524,9 +516,11 @@ dotraplinkage void __kprobes do_int3(struct pt_regs *regs, long error_code)
 }
 
 #ifdef CONFIG_X86_64
-/* Help handler running on IST stack to switch back to user stack
-   for scheduling or signal handling. The actual stack switch is done in
-   entry.S */
+/*
+ * Help handler running on IST stack to switch back to user stack
+ * for scheduling or signal handling. The actual stack switch is done in
+ * entry.S
+ */
 asmlinkage __kprobes struct pt_regs *sync_regs(struct pt_regs *eregs)
 {
        struct pt_regs *regs = eregs;
@@ -536,8 +530,10 @@ asmlinkage __kprobes struct pt_regs *sync_regs(struct pt_regs *eregs)
        /* Exception from user space */
        else if (user_mode(eregs))
                regs = task_pt_regs(current);
-       /* Exception from kernel and interrupts are enabled. Move to
-          kernel process stack. */
+       /*
+        * Exception from kernel and interrupts are enabled. Move to
+        * kernel process stack.
+        */
        else if (eregs->flags & X86_EFLAGS_IF)
                regs = (struct pt_regs *)(eregs->sp -= sizeof(struct pt_regs));
        if (eregs != regs)
@@ -689,12 +685,7 @@ void math_error(void __user *ip)
        cwd = get_fpu_cwd(task);
        swd = get_fpu_swd(task);
 
-       err = swd & ~cwd & 0x3f;
-
-#if CONFIG_X86_32
-       if (!err)
-               return;
-#endif
+       err = swd & ~cwd;
 
        if (err & 0x001) {      /* Invalid op */
                /*
@@ -712,7 +703,11 @@ void math_error(void __user *ip)
        } else if (err & 0x020) { /* Precision */
                info.si_code = FPE_FLTRES;
        } else {
-               info.si_code = __SI_FAULT|SI_KERNEL; /* WTF? */
+               /*
+                * If we're using IRQ 13, or supposedly even some trap 16
+                * implementations, it's possible we get a spurious trap...
+                */
+               return;         /* Spurious trap, no error */
        }
        force_sig_info(SIGFPE, &info, task);
 }
@@ -900,7 +895,7 @@ asmlinkage void math_state_restore(void)
 EXPORT_SYMBOL_GPL(math_state_restore);
 
 #ifndef CONFIG_MATH_EMULATION
-asmlinkage void math_emulate(long arg)
+void math_emulate(struct math_emu_info *info)
 {
        printk(KERN_EMERG
                "math-emulation not enabled and no coprocessor found.\n");
@@ -911,12 +906,16 @@ asmlinkage void math_emulate(long arg)
 #endif /* CONFIG_MATH_EMULATION */
 
 dotraplinkage void __kprobes
-do_device_not_available(struct pt_regs *regs, long error)
+do_device_not_available(struct pt_regs *regs, long error_code)
 {
 #ifdef CONFIG_X86_32
        if (read_cr0() & X86_CR0_EM) {
+               struct math_emu_info info = { };
+
                conditional_sti(regs);
-               math_emulate(0);
+
+               info.regs = regs;
+               math_emulate(&info);
        } else {
                math_state_restore(); /* interrupts still off */
                conditional_sti(regs);
@@ -945,9 +944,7 @@ dotraplinkage void do_iret_error(struct pt_regs *regs, long error_code)
 
 void __init trap_init(void)
 {
-#ifdef CONFIG_X86_32
        int i;
-#endif
 
 #ifdef CONFIG_EISA
        void __iomem *p = early_ioremap(0x0FFFD9, 4);
@@ -1004,11 +1001,15 @@ void __init trap_init(void)
        }
 
        set_system_trap_gate(SYSCALL_VECTOR, &system_call);
+#endif
 
        /* Reserve all the builtin and the syscall vector: */
        for (i = 0; i < FIRST_EXTERNAL_VECTOR; i++)
                set_bit(i, used_vectors);
 
+#ifdef CONFIG_X86_64
+       set_bit(IA32_SYSCALL_VECTOR, used_vectors);
+#else
        set_bit(SYSCALL_VECTOR, used_vectors);
 #endif
        /*