diff options
Diffstat (limited to 'arch/x86/kernel/traps.c')
| -rw-r--r-- | arch/x86/kernel/traps.c | 23 |
1 files changed, 5 insertions, 18 deletions
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index 88900e288021..28f3e5ffc55d 100644 --- a/arch/x86/kernel/traps.c +++ b/arch/x86/kernel/traps.c @@ -466,27 +466,14 @@ NOKPROBE_SYMBOL(do_int3); #ifdef CONFIG_X86_64 /* - * Help handler running on IST stack to switch back to user stack - * for scheduling or signal handling. The actual stack switch is done in - * entry.S + * Help handler running on IST stack to switch off the IST stack if the + * interrupted code was in user mode. The actual stack switch is done in + * entry_64.S */ asmlinkage __visible notrace struct pt_regs *sync_regs(struct pt_regs *eregs) { - struct pt_regs *regs = eregs; - /* Did already sync */ - if (eregs == (struct pt_regs *)eregs->sp) - ; - /* Exception from user space */ - else if (user_mode(eregs)) - regs = task_pt_regs(current); - /* - * Exception from kernel and interrupts are enabled. Move to - * kernel process stack. - */ - else if (eregs->flags & X86_EFLAGS_IF) - regs = (struct pt_regs *)(eregs->sp -= sizeof(struct pt_regs)); - if (eregs != regs) - *regs = *eregs; + struct pt_regs *regs = task_pt_regs(current); + *regs = *eregs; return regs; } NOKPROBE_SYMBOL(sync_regs); |