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Commit 143a5d32 authored by Peter Zijlstra's avatar Peter Zijlstra
Browse files

lockdep: fixup irq tracing 



Ensure we fixup the IRQ state before we hit any locking code.

Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent c9927c2b

arch/x86/kernel/kprobes_32.c

+1 −6
Original line number Diff line number Diff line
@@ -564,12 +564,7 @@ static int __kprobes post_kprobe_handler(struct pt_regs *regs) 


	resume_execution(cur, regs, kcb);

	regs->eflags |= kcb->kprobe_saved_eflags;

#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT

	if (raw_irqs_disabled_flags(regs->eflags))

		trace_hardirqs_off();

	else

		trace_hardirqs_on();

#endif

	trace_hardirqs_fixup_flags(regs->eflags);



	/*Restore back the original saved kprobes variables and continue. */

	if (kcb->kprobe_status == KPROBE_REENTER) {

arch/x86/kernel/kprobes_64.c

+1 −6
Original line number Diff line number Diff line
@@ -551,12 +551,7 @@ int __kprobes post_kprobe_handler(struct pt_regs *regs) 


	resume_execution(cur, regs, kcb);

	regs->eflags |= kcb->kprobe_saved_rflags;

#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT

	if (raw_irqs_disabled_flags(regs->eflags))

		trace_hardirqs_off();

	else

		trace_hardirqs_on();

#endif

	trace_hardirqs_fixup_flags(regs->eflags);



	/* Restore the original saved kprobes variables and continue. */

	if (kcb->kprobe_status == KPROBE_REENTER) {

arch/x86/kernel/traps_32.c

+2 −0
Original line number Diff line number Diff line
@@ -789,6 +789,8 @@ void restart_nmi(void) 
#ifdef CONFIG_KPROBES

fastcall void __kprobes do_int3(struct pt_regs *regs, long error_code)

{

	trace_hardirqs_fixup();



	if (notify_die(DIE_INT3, "int3", regs, error_code, 3, SIGTRAP)

			== NOTIFY_STOP)

		return;

arch/x86/kernel/traps_64.c

+2 −0
Original line number Diff line number Diff line
@@ -807,6 +807,8 @@ asmlinkage __kprobes void default_do_nmi(struct pt_regs *regs) 
/* runs on IST stack. */

asmlinkage void __kprobes do_int3(struct pt_regs * regs, long error_code)

{

	trace_hardirqs_fixup();



	if (notify_die(DIE_INT3, "int3", regs, error_code, 3, SIGTRAP) == NOTIFY_STOP) {

		return;

	}

arch/x86/mm/fault_32.c

+5 −0
Original line number Diff line number Diff line
@@ -303,6 +303,11 @@ fastcall void __kprobes do_page_fault(struct pt_regs *regs, 
	int write, si_code;

	int fault;



	/*

	 * We can fault from pretty much anywhere, with unknown IRQ state.

	 */

	trace_hardirqs_fixup();



	/* get the address */

        address = read_cr2();