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powerpc/tm: Remove interrupt disable in __switch_to()

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We currently turn IRQs off in __switch_to(0 but this is unnecessary as it's
already disabled in the caller.

This removes the IRQ disable but adds a check to make sure it is really off
in case this changes in future.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Michael Neuling 2013-10-02 17:15:14 +10:00 committed by Benjamin Herrenschmidt
parent d0cebfa650
commit 7ba5fef7d9
1 changed files with 2 additions and 5 deletions
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7
arch/powerpc/kernel/process.c
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@ -597,12 +597,13 @@ struct task_struct *__switch_to(struct task_struct *prev,
struct task_struct *new)
{
struct thread_struct *new_thread, *old_thread;
unsigned long flags;
struct task_struct *last;
#ifdef CONFIG_PPC_BOOK3S_64
struct ppc64_tlb_batch *batch;
#endif
WARN_ON(!irqs_disabled());
/* Back up the TAR across context switches.
* Note that the TAR is not available for use in the kernel. (To
* provide this, the TAR should be backed up/restored on exception
@ -722,8 +723,6 @@ struct task_struct *__switch_to(struct task_struct *prev,
}
#endif /* CONFIG_PPC_BOOK3S_64 */
local_irq_save(flags);
/*
* We can't take a PMU exception inside _switch() since there is a
* window where the kernel stack SLB and the kernel stack are out
@ -743,8 +742,6 @@ struct task_struct *__switch_to(struct task_struct *prev,
}
#endif /* CONFIG_PPC_BOOK3S_64 */
local_irq_restore(flags);
return last;
}