From: Scott Wood Date: Wed, 7 Oct 2015 03:48:06 +0000 (-0500) Subject: powerpc/fsl-corenet: Disable coreint if kexec is enabled X-Git-Tag: firefly_0821_release~176^2~775^2~1^2~23 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=9f640bf5321dff6af69016d8fe753efa6b2f3e72;p=firefly-linux-kernel-4.4.55.git powerpc/fsl-corenet: Disable coreint if kexec is enabled Problems have been observed in coreint (EPR) mode if interrupts are left pending (due to the lack of device quiescence with kdump) after having tried to deliver to a CPU but unable to deliver due to MSR[EE] -- interrupts no longer get reliably delivered in the new kernel. I tried various ways of fixing it up inside the crash kernel itself, and none worked (including resetting the entire mpic). Masking all interrupts and issuing EOIs in the crashing kernel did help a lot of the time, but the behavior was not consistent. Thus, stick to standard IACK mode when kdump is a possibility. Signed-off-by: Scott Wood --- diff --git a/arch/powerpc/platforms/85xx/corenet_generic.c b/arch/powerpc/platforms/85xx/corenet_generic.c index 3a8be47c0e3a..46d05c94add6 100644 --- a/arch/powerpc/platforms/85xx/corenet_generic.c +++ b/arch/powerpc/platforms/85xx/corenet_generic.c @@ -216,10 +216,12 @@ define_machine(corenet_generic) { .pcibios_fixup_phb = fsl_pcibios_fixup_phb, #endif /* - * Core reset may cause issue if using the proxy mode of MPIC. + * Core reset may cause issues if using the proxy mode of MPIC. * So, use the mixed mode of MPIC if enabling CPU hotplug. + * + * Likewise, problems have been seen with kexec when coreint is enabled. */ -#ifdef CONFIG_HOTPLUG_CPU +#if defined(CONFIG_HOTPLUG_CPU) || defined(CONFIG_KEXEC) .get_irq = mpic_get_irq, #else .get_irq = mpic_get_coreint_irq,