| From | Herton Ronaldo Krzesinski <> | Subject | [PATCH 66/93] powerpc/book3e: Disable interrupt after preempt_schedule_irq | Date | Tue, 5 Feb 2013 20:06:55 -0200 |
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3.5.7.5 -stable review patch. If anyone has any objections, please let me know.
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From: Tiejun Chen <tiejun.chen@windriver.com>
commit 572177d7c77db1981ba2563e01478126482c43bc upstream.
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> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com> --- arch/powerpc/kernel/entry_64.S | 13 +++++++++++++ 1 file changed, 13 insertions(+)
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S index 8d2fa24..fad2e83 100644 --- a/arch/powerpc/kernel/entry_64.S +++ b/arch/powerpc/kernel/entry_64.S @@ -616,6 +616,19 @@ 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 -- 1.7.9.5
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