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x86/asm/entry: Replace some open-coded VM86 checks with v8086_mode() checks

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This allows us to remove some unnecessary ifdefs.  There should
be no change to the generated code.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brad Spengler <spender@grsecurity.net>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/f7e00f0d668e253abf0bd8bf36491ac47bd761ff.1426728647.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Andy Lutomirski 2015-03-18 18:33:35 -07:00 committed by Ingo Molnar
parent 7a2806741e
commit d74ef1118a
1 changed files with 4 additions and 7 deletions
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11
arch/x86/kernel/traps.c
View file

@ -194,8 +194,7 @@ static nokprobe_inline int
do_trap_no_signal(struct task_struct *tsk, int trapnr, char *str,
struct pt_regs *regs, long error_code)
{
#ifdef CONFIG_X86_32
if (regs->flags & X86_VM_MASK) {
if (v8086_mode(regs)) {
/*
* Traps 0, 1, 3, 4, and 5 should be forwarded to vm86.
* On nmi (interrupt 2), do_trap should not be called.
@ -207,7 +206,7 @@ do_trap_no_signal(struct task_struct *tsk, int trapnr, char *str,
}
return -1;
}
#endif
if (!user_mode_ignore_vm86(regs)) {
if (!fixup_exception(regs)) {
tsk->thread.error_code = error_code;
@ -462,13 +461,11 @@ do_general_protection(struct pt_regs *regs, long error_code)
prev_state = exception_enter();
conditional_sti(regs);
#ifdef CONFIG_X86_32
if (regs->flags & X86_VM_MASK) {
if (v8086_mode(regs)) {
local_irq_enable();
handle_vm86_fault((struct kernel_vm86_regs *) regs, error_code);
goto exit;
}
#endif
tsk = current;
if (!user_mode_ignore_vm86(regs)) {
@ -673,7 +670,7 @@ dotraplinkage void do_debug(struct pt_regs *regs, long error_code)
/* It's safe to allow irq's after DR6 has been saved */
preempt_conditional_sti(regs);
if (regs->flags & X86_VM_MASK) {
if (v8086_mode(regs)) {
handle_vm86_trap((struct kernel_vm86_regs *) regs, error_code,
X86_TRAP_DB);
preempt_conditional_cli(regs);