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Diffstat (limited to 'arch/x86/kernel/process_64.c')
-rw-r--r--arch/x86/kernel/process_64.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index 6a62f4af9fcf..f8e1af380cdf 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -392,6 +392,7 @@ int copy_thread_tls(unsigned long clone_flags, unsigned long sp,
childregs = task_pt_regs(p);
fork_frame = container_of(childregs, struct fork_frame, regs);
frame = &fork_frame->frame;
+
frame->bp = 0;
frame->ret_addr = (unsigned long) ret_from_fork;
p->thread.sp = (unsigned long) fork_frame;
@@ -520,7 +521,8 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
WARN_ON_ONCE(IS_ENABLED(CONFIG_DEBUG_ENTRY) &&
this_cpu_read(irq_count) != -1);
- switch_fpu_prepare(prev_fpu, cpu);
+ if (!test_thread_flag(TIF_NEED_FPU_LOAD))
+ switch_fpu_prepare(prev_fpu, cpu);
/* We must save %fs and %gs before load_TLS() because
* %fs and %gs may be cleared by load_TLS().
@@ -538,9 +540,7 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
/*
* Leave lazy mode, flushing any hypercalls made here. This
* must be done after loading TLS entries in the GDT but before
- * loading segments that might reference them, and and it must
- * be done before fpu__restore(), so the TS bit is up to
- * date.
+ * loading segments that might reference them.
*/
arch_end_context_switch(next_p);
@@ -568,14 +568,14 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
x86_fsgsbase_load(prev, next);
- switch_fpu_finish(next_fpu, cpu);
-
/*
* Switch the PDA and FPU contexts.
*/
this_cpu_write(current_task, next_p);
this_cpu_write(cpu_current_top_of_stack, task_top_of_stack(next_p));
+ switch_fpu_finish(next_fpu);
+
/* Reload sp0. */
update_task_stack(next_p);