1 files changed, 23 insertions, 31 deletions

diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index 5204332f475d..83264922a878 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -76,7 +76,7 @@ char ignore_fpu_irq;
  * F0 0F bug workaround.. We have a special link segment
  * for this.
  */
-gate_desc idt_table[256]
+gate_desc idt_table[NR_VECTORS]
         __attribute__((__section__(".data.idt"))) = { { { { 0, 0 } } }, };
 #endif
 
@@ -786,33 +786,34 @@ do_spurious_interrupt_bug(struct pt_regs *regs, long error_code)
 #endif
 }
 
-#ifdef CONFIG_X86_32
-unsigned long patch_espfix_desc(unsigned long uesp, unsigned long kesp)
+asmlinkage void __attribute__((weak)) smp_thermal_interrupt(void)
 {
-        struct desc_struct *gdt = get_cpu_gdt_table(smp_processor_id());
-        unsigned long base = (kesp - uesp) & -THREAD_SIZE;
-        unsigned long new_kesp = kesp - base;
-        unsigned long lim_pages = (new_kesp | (THREAD_SIZE - 1)) >> PAGE_SHIFT;
-        __u64 desc = *(__u64 *)&gdt[GDT_ENTRY_ESPFIX_SS];
-
-        /* Set up base for espfix segment */
-        desc &= 0x00f0ff0000000000ULL;
-        desc |= ((((__u64)base) << 16) & 0x000000ffffff0000ULL) |
-                ((((__u64)base) << 32) & 0xff00000000000000ULL) |
-                ((((__u64)lim_pages) << 32) & 0x000f000000000000ULL) |
-                (lim_pages & 0xffff);
-        *(__u64 *)&gdt[GDT_ENTRY_ESPFIX_SS] = desc;
-
-        return new_kesp;
 }
-#endif
 
-asmlinkage void __attribute__((weak)) smp_thermal_interrupt(void)
+asmlinkage void __attribute__((weak)) smp_threshold_interrupt(void)
 {
 }
 
-asmlinkage void __attribute__((weak)) smp_threshold_interrupt(void)
+/*
+ * __math_state_restore assumes that cr0.TS is already clear and the
+ * fpu state is all ready for use.  Used during context switch.
+ */
+void __math_state_restore(void)
 {
+        struct thread_info *thread = current_thread_info();
+        struct task_struct *tsk = thread->task;
+
+        /*
+         * Paranoid restore. send a SIGSEGV if we fail to restore the state.
+         */
+        if (unlikely(restore_fpu_checking(tsk))) {
+                stts();
+                force_sig(SIGSEGV, tsk);
+                return;
+        }
+
+        thread->status |= TS_USEDFPU;   /* So we fnsave on switch_to() */
+        tsk->fpu_counter++;
 }
 
 /*
@@ -846,17 +847,8 @@ asmlinkage void math_state_restore(void)
         }
 
         clts();                         /* Allow maths ops (or we recurse) */
-        /*
-         * Paranoid restore. send a SIGSEGV if we fail to restore the state.
-         */
-        if (unlikely(restore_fpu_checking(tsk))) {
-                stts();
-                force_sig(SIGSEGV, tsk);
-                return;
-        }
 
-        thread->status |= TS_USEDFPU;   /* So we fnsave on switch_to() */
-        tsk->fpu_counter++;
+        __math_state_restore();
 }
 EXPORT_SYMBOL_GPL(math_state_restore);