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| author | Tiejun Chen <tiejun.chen@windriver.com> | 2013-01-06 00:49:34 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-01-29 10:18:15 +1100 |
| commit | 572177d7c77db1981ba2563e01478126482c43bc (patch) | |
| tree | 89a68e8ee9014606031f98f0222f037eb7510aa1 | |
| parent | 46ed7a76ae7770cb8ba733ee2b06273397ad8b5b (diff) | |
| download | linux-stable-572177d7c77db1981ba2563e01478126482c43bc.tar.gz linux-stable-572177d7c77db1981ba2563e01478126482c43bc.tar.bz2 linux-stable-572177d7c77db1981ba2563e01478126482c43bc.zip | |
powerpc/book3e: Disable interrupt after preempt_schedule_irq
In preempt case current arch_local_irq_restore() from
preempt_schedule_irq() may enable hard interrupt but we really
should disable interrupts when we return from the interrupt,
and so that we don't get interrupted after loading SRR0/1.
Signed-off-by: Tiejun Chen <tiejun.chen@windriver.com>
CC: <stable@vger.kernel.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
| -rw-r--r-- | arch/powerpc/kernel/entry_64.S | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S index b310a0573625..3d990d3bd8ba 100644 --- a/arch/powerpc/kernel/entry_64.S +++ b/arch/powerpc/kernel/entry_64.S @@ -664,6 +664,19 @@ resume_kernel: ld r4,TI_FLAGS(r9) andi. r0,r4,_TIF_NEED_RESCHED bne 1b + + /* + * arch_local_irq_restore() from preempt_schedule_irq above may + * enable hard interrupt but we really should disable interrupts + * when we return from the interrupt, and so that we don't get + * interrupted after loading SRR0/1. + */ +#ifdef CONFIG_PPC_BOOK3E + wrteei 0 +#else + ld r10,PACAKMSR(r13) /* Get kernel MSR without EE */ + mtmsrd r10,1 /* Update machine state */ +#endif /* CONFIG_PPC_BOOK3E */ #endif /* CONFIG_PREEMPT */ .globl fast_exc_return_irq |