1 files changed, 8 insertions, 79 deletions

diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index ef6a8456f719..b644e1c765dc 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -66,15 +66,13 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
 {
         int ret;
 
-        unlazy_fpu(src);
-
         *dst = *src;
         if (fpu_allocated(&src->thread.fpu)) {
                 memset(&dst->thread.fpu, 0, sizeof(dst->thread.fpu));
                 ret = fpu_alloc(&dst->thread.fpu);
                 if (ret)
                         return ret;
-                fpu_copy(&dst->thread.fpu, &src->thread.fpu);
+                fpu_copy(dst, src);
         }
         return 0;
 }
@@ -97,16 +95,6 @@ void arch_task_cache_init(void)
                                   SLAB_PANIC | SLAB_NOTRACK, NULL);
 }
 
-static inline void drop_fpu(struct task_struct *tsk)
-{
-        /*
-         * Forget coprocessor state..
-         */
-        tsk->fpu_counter = 0;
-        clear_fpu(tsk);
-        clear_used_math();
-}
-
 /*
  * Free current thread data structures etc..
  */
@@ -163,7 +151,13 @@ void flush_thread(void)
 
         flush_ptrace_hw_breakpoint(tsk);
         memset(tsk->thread.tls_array, 0, sizeof(tsk->thread.tls_array));
-        drop_fpu(tsk);
+        drop_init_fpu(tsk);
+        /*
+         * Free the FPU state for non xsave platforms. They get reallocated
+         * lazily at the first use.
+         */
+        if (!use_eager_fpu())
+                free_thread_xstate(tsk);
 }
 
 static void hard_disable_TSC(void)
@@ -299,71 +293,6 @@ sys_clone(unsigned long clone_flags, unsigned long newsp,
 }
 
 /*
- * This gets run with %si containing the
- * function to call, and %di containing
- * the "args".
- */
-extern void kernel_thread_helper(void);
-
-/*
- * Create a kernel thread
- */
-int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
-{
-        struct pt_regs regs;
-
-        memset(&regs, 0, sizeof(regs));
-
-        regs.si = (unsigned long) fn;
-        regs.di = (unsigned long) arg;
-
-#ifdef CONFIG_X86_32
-        regs.ds = __USER_DS;
-        regs.es = __USER_DS;
-        regs.fs = __KERNEL_PERCPU;
-        regs.gs = __KERNEL_STACK_CANARY;
-#else
-        regs.ss = __KERNEL_DS;
-#endif
-
-        regs.orig_ax = -1;
-        regs.ip = (unsigned long) kernel_thread_helper;
-        regs.cs = __KERNEL_CS | get_kernel_rpl();
-        regs.flags = X86_EFLAGS_IF | X86_EFLAGS_BIT1;
-
-        /* Ok, create the new process.. */
-        return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, &regs, 0, NULL, NULL);
-}
-EXPORT_SYMBOL(kernel_thread);
-
-/*
- * sys_execve() executes a new program.
- */
-long sys_execve(const char __user *name,
-                const char __user *const __user *argv,
-                const char __user *const __user *envp, struct pt_regs *regs)
-{
-        long error;
-        char *filename;
-
-        filename = getname(name);
-        error = PTR_ERR(filename);
-        if (IS_ERR(filename))
-                return error;
-        error = do_execve(filename, argv, envp, regs);
-
-#ifdef CONFIG_X86_32
-        if (error == 0) {
-                /* Make sure we don't return using sysenter.. */
-                set_thread_flag(TIF_IRET);
-        }
-#endif
-
-        putname(filename);
-        return error;
-}
-
-/*
  * Idle related variables and functions
  */
 unsigned long boot_option_idle_override = IDLE_NO_OVERRIDE;