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Commit b36e4758 authored by Russell King's avatar Russell King Committed by Russell King
Browse files

[ARM] Fix kernel/fork.c for lockdep on ARM 



ARM has interrupts enabled over context switches (iow, has
__ARCH_WANT_INTERRUPTS_ON_CTXSW defined.)  The lockdep code in fork.c
 assumes that interrupts are always disabled.  Fix this wrong
assumption by making the initialisation of 'p->hardirqs_enabled'
depend on __ARCH_WANT_INTERRUPTS_ON_CTXSW.

Acked-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 7ad1bcb2

kernel/fork.c

+4 −0
Original line number Diff line number Diff line
@@ -1056,7 +1056,11 @@ static struct task_struct *copy_process(unsigned long clone_flags, 
#endif

#ifdef CONFIG_TRACE_IRQFLAGS

	p->irq_events = 0;

#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW

	p->hardirqs_enabled = 1;

#else

	p->hardirqs_enabled = 0;

#endif

	p->hardirq_enable_ip = 0;

	p->hardirq_enable_event = 0;

	p->hardirq_disable_ip = _THIS_IP_;