Hi folks, This is my take at fixing [1]. Reading about the LPI tables situation was entertaining. Tested against kexec on an Ampere eMAG. Seems to be working fine atop 5.15-rc6. On the other hand, I can only issue one kexec from 5.15-rc6-rt12 - if I then issue another one on the new kernel, I get tasks hanging. That is true even without my patches and without CONFIG_PREEMPT_RT. [1]: http://lore.kernel.org/r/20210810134127.1394269-3-valentin.schneider@xxxxxxx Revisions ========= v1 -> v2 ++++++++ o Ditched RDIST_FLAGS renaming; moved to "RD_LOCAL" prefix for new flags (Marc) o Simplified cpuhp callback logic: body now runs at most once per CPU o Changed cpuhp callback installation to happen *after* the BP has invoked its_cpu_init(); the BP cpuhp state is immediately set to CPUHP_ONLINE, so cpuhp state alone doesn't guarantee its_cpu_init() has been run. Cheers, Valentin Valentin Schneider (3): irqchip/gic-v3-its: Give the percpu rdist struct its own flags field irqchip/gic-v3-its: Postpone LPI pending table freeing and memreserve irqchip/gic-v3-its: Limit memreserve cpuhp state lifetime drivers/irqchip/irq-gic-v3-its.c | 82 +++++++++++++++++++++++++++--- drivers/irqchip/irq-gic-v3.c | 1 + include/linux/irqchip/arm-gic-v3.h | 4 +- 3 files changed, 79 insertions(+), 8 deletions(-) -- 2.25.1
