Merge ../torvalds-2.6/

1 files changed, 29 insertions, 4 deletions

diff --git a/arch/i386/kernel/traps.c b/arch/i386/kernel/traps.c
index ab0e9430f775..53ad954e3ba4 100644
--- a/arch/i386/kernel/traps.c
+++ b/arch/i386/kernel/traps.c
@@ -306,14 +306,17 @@ void die(const char * str, struct pt_regs * regs, long err)
                 .lock_owner_depth =     0
         };
         static int die_counter;
+        unsigned long flags;
 
         if (die.lock_owner != raw_smp_processor_id()) {
                 console_verbose();
-                spin_lock_irq(&die.lock);
+                spin_lock_irqsave(&die.lock, flags);
                 die.lock_owner = smp_processor_id();
                 die.lock_owner_depth = 0;
                 bust_spinlocks(1);
         }
+        else
+                local_save_flags(flags);
 
         if (++die.lock_owner_depth < 3) {
                 int nl = 0;
@@ -340,7 +343,7 @@ void die(const char * str, struct pt_regs * regs, long err)
 
         bust_spinlocks(0);
         die.lock_owner = -1;
-        spin_unlock_irq(&die.lock);
+        spin_unlock_irqrestore(&die.lock, flags);
 
         if (kexec_should_crash(current))
                 crash_kexec(regs);
@@ -1075,9 +1078,9 @@ void __init trap_init(void)
         set_trap_gate(0,&divide_error);
         set_intr_gate(1,&debug);
         set_intr_gate(2,&nmi);
-        set_system_intr_gate(3, &int3); /* int3-5 can be called from all */
+        set_system_intr_gate(3, &int3); /* int3/4 can be called from all */
         set_system_gate(4,&overflow);
-        set_system_gate(5,&bounds);
+        set_trap_gate(5,&bounds);
         set_trap_gate(6,&invalid_op);
         set_trap_gate(7,&device_not_available);
         set_task_gate(8,GDT_ENTRY_DOUBLEFAULT_TSS);
@@ -1095,6 +1098,28 @@ void __init trap_init(void)
 #endif
         set_trap_gate(19,&simd_coprocessor_error);
 
+        if (cpu_has_fxsr) {
+                /*
+                 * Verify that the FXSAVE/FXRSTOR data will be 16-byte aligned.
+                 * Generates a compile-time "error: zero width for bit-field" if
+                 * the alignment is wrong.
+                 */
+                struct fxsrAlignAssert {
+                        int _:!(offsetof(struct task_struct,
+                                        thread.i387.fxsave) & 15);
+                };
+
+                printk(KERN_INFO "Enabling fast FPU save and restore... ");
+                set_in_cr4(X86_CR4_OSFXSR);
+                printk("done.\n");
+        }
+        if (cpu_has_xmm) {
+                printk(KERN_INFO "Enabling unmasked SIMD FPU exception "
+                                "support... ");
+                set_in_cr4(X86_CR4_OSXMMEXCPT);
+                printk("done.\n");
+        }
+
         set_system_gate(SYSCALL_VECTOR,&system_call);
 
         /*