A problem about interrupt when booting a captured kernel
marc.zyngier at arm.com
Tue Nov 17 01:07:36 PST 2015
On Tue, 17 Nov 2015 10:05:23 +0900
AKASHI Takahiro <takahiro.akashi at linaro.org> wrote:
> (Cc: Mark)
> On 11/17/2015 04:26 AM, Marc Zyngier wrote:
> > On 13/11/15 10:09, Yang Yingliang wrote:
> >> Hi, Marc
> >> The kexec will boot a captured kernel while the kernel panic. But
> >> it boots failed if the kernel panic in handler function of PPI. The
> >> reason is that the PPI has not been 'eoi', other interrupts can not be
> >> handled when booting the captured kernel.
> >> The kexec will call irq_eoi to end the irqs that have
> >> IRQD_IRQ_INPROGRESS flag. But PPIs don't have this flag, so it won't be
> >> ended.
> >> Three ways to solve this problem we can think :
> >> 1. Is there a way to reset gic like its_reset ?
> >> 2. Can we add some flag for calling irq_eoi ?
> >> 3. Just 'eoi' all PPIs without checking flags in kexec.
> >> Please give some advice.
> > Good timing. Please see:
> > http://lists.infradead.org/pipermail/linux-arm-kernel/2015-November/385383.html
> I removed machine_kexec_mask_interrupts() from my arm64 kdump patch series
> due to the past discussions.
> Is it the time that I should resurrect the code?
Jazz is not dead. It just smells funny.
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