Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-for-linus-2.6

[cascardo/linux.git] / arch / x86_64 / kernel / traps.c

diff --git a/arch/x86_64/kernel/traps.c b/arch/x86_64/kernel/traps.c
index f238d60..b5e09e6 100644 (file)
--- a/arch/x86_64/kernel/traps.c
+++ b/arch/x86_64/kernel/traps.c
@@ -47,9 +47,6 @@
 #include <asm/proto.h>
 #include <asm/nmi.h>
 
-#include <linux/irq.h>
-
-
 extern struct gate_struct idt_table[256]; 
 
 asmlinkage void divide_error(void);
@@ -324,13 +321,13 @@ void handle_BUG(struct pt_regs *regs)
        if (__copy_from_user(&f, (struct bug_frame *) regs->rip, 
                             sizeof(struct bug_frame)))
                return; 
-       if ((unsigned long)f.filename < __PAGE_OFFSET || 
+       if (f.filename >= 0 ||
            f.ud2[0] != 0x0f || f.ud2[1] != 0x0b) 
                return;
-       if (__get_user(tmp, f.filename))
-               f.filename = "unmapped filename"; 
+       if (__get_user(tmp, (char *)(long)f.filename))
+               f.filename = (int)(long)"unmapped filename";
        printk("----------- [cut here ] --------- [please bite here ] ---------\n");
-       printk(KERN_ALERT "Kernel BUG at %.50s:%d\n", f.filename, f.line);
+       printk(KERN_ALERT "Kernel BUG at %.50s:%d\n", (char *)(long)f.filename, f.line);
 } 
 
 #ifdef CONFIG_BUG
@@ -343,30 +340,33 @@ void out_of_line_bug(void)
 static DEFINE_SPINLOCK(die_lock);
 static int die_owner = -1;
 
-void oops_begin(void)
+unsigned long oops_begin(void)
 {
-       int cpu = safe_smp_processor_id(); 
-       /* racy, but better than risking deadlock. */ 
-       local_irq_disable();
+       int cpu = safe_smp_processor_id();
+       unsigned long flags;
+
+       /* racy, but better than risking deadlock. */
+       local_irq_save(flags);
        if (!spin_trylock(&die_lock)) { 
                if (cpu == die_owner) 
                        /* nested oops. should stop eventually */;
                else
-                       spin_lock(&die_lock); 
+                       spin_lock(&die_lock);
        }
-       die_owner = cpu; 
+       die_owner = cpu;
        console_verbose();
-       bust_spinlocks(1); 
+       bust_spinlocks(1);
+       return flags;
 }
 
-void oops_end(void)
+void oops_end(unsigned long flags)
 { 
        die_owner = -1;
-       bust_spinlocks(0); 
-       spin_unlock(&die_lock); 
+       bust_spinlocks(0);
+       spin_unlock_irqrestore(&die_lock, flags);
        if (panic_on_oops)
-               panic("Oops"); 
-} 
+               panic("Oops");
+}
 
 void __die(const char * str, struct pt_regs * regs, long err)
 {
@@ -392,10 +392,11 @@ void __die(const char * str, struct pt_regs * regs, long err)
 
 void die(const char * str, struct pt_regs * regs, long err)
 {
-       oops_begin();
+       unsigned long flags = oops_begin();
+
        handle_BUG(regs);
        __die(str, regs, err);
-       oops_end();
+       oops_end(flags);
        do_exit(SIGSEGV); 
 }
 static inline void die_if_kernel(const char * str, struct pt_regs * regs, long err)
@@ -406,7 +407,8 @@ static inline void die_if_kernel(const char * str, struct pt_regs * regs, long e
 
 void die_nmi(char *str, struct pt_regs *regs)
 {
-       oops_begin();
+       unsigned long flags = oops_begin();
+
        /*
         * We are in trouble anyway, lets at least try
         * to get a message out.
@@ -416,7 +418,7 @@ void die_nmi(char *str, struct pt_regs *regs)
        if (panic_on_timeout || panic_on_oops)
                panic("nmi watchdog");
        printk("console shuts up ...\n");
-       oops_end();
+       oops_end(flags);
        do_exit(SIGSEGV);
 }
 
@@ -790,13 +792,16 @@ asmlinkage void do_coprocessor_error(struct pt_regs *regs)
         */
        cwd = get_fpu_cwd(task);
        swd = get_fpu_swd(task);
-       switch (((~cwd) & swd & 0x3f) | (swd & 0x240)) {
+       switch (swd & ~cwd & 0x3f) {
                case 0x000:
                default:
                        break;
                case 0x001: /* Invalid Op */
-               case 0x041: /* Stack Fault */
-               case 0x241: /* Stack Fault | Direction */
+                       /*
+                        * swd & 0x240 == 0x040: Stack Underflow
+                        * swd & 0x240 == 0x240: Stack Overflow
+                        * User must clear the SF bit (0x40) if set
+                        */
                        info.si_code = FPE_FLTINV;
                        break;
                case 0x002: /* Denormalize */