A problem about interrupt when booting a captured kernel
takahiro.akashi at linaro.org
Mon Nov 16 17:05:23 PST 2015
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
>> 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:
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?
> and let me know if that fixes things for you.
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