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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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578d36f5e1
When testing PREEMPT_RT kernel on BF561-EZKit, the kernel blocks while booting. When the kernel initializes the ethernet driver, it sleeps and never wakes up. The issue happens when the kernel waits for a timer for Core B to timeout (the timers are per-cpu based: static DEFINE_PER_CPU(struct tvec_base *, tvec_bases) = &boot_tvec_bases). However, the ksoftirqd thread for Core B (note, the ksoftirqd thread is also per-cpu based) cannot work properly, and the timers for Core B never times out. When ksoftirqd() for the first time runs on core B, it is possible core A is still initializing core B (see smp_init() -> cpu_up() -> __cpu_up()). So the "cpu_is_offline()" check may return true and ksoftirqd moves to "wait_to_die". So delay the core b start up until the per-cpu timers have been set up fully. Signed-off-by: Yi Li <yi.li@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org> |
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| .. | ||
| arch_checks.c | ||
| cache-c.c | ||
| cache.S | ||
| clocks-init.c | ||
| cpufreq.c | ||
| dpmc_modes.S | ||
| dpmc.c | ||
| entry.S | ||
| head.S | ||
| interrupt.S | ||
| ints-priority.c | ||
| irqpanic.c | ||
| Makefile | ||
| pm.c | ||
| smp.c | ||