From: Shaohua Li Date: Sat, 25 Jun 2005 21:55:15 +0000 (-0700) Subject: [PATCH] CPU hotplug printk fix X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=ac25575203c11145066ea5cb583354cb5f0a8ade;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git [PATCH] CPU hotplug printk fix In the cpu hotplug case, per-cpu data possibly isn't initialized even the system state is 'running'. As the comments say in the original code, some console drivers assume per-cpu resources have been allocated. radeon fb is one such driver, which uses kmalloc. After a CPU is down, the per-cpu data of slab is freed, so the system crashed when printing some info. Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/kernel/printk.c b/kernel/printk.c index 3a442bfb8bee..5092397fac29 100644 --- a/kernel/printk.c +++ b/kernel/printk.c @@ -588,8 +588,7 @@ asmlinkage int vprintk(const char *fmt, va_list args) log_level_unknown = 1; } - if (!cpu_online(smp_processor_id()) && - system_state != SYSTEM_RUNNING) { + if (!cpu_online(smp_processor_id())) { /* * Some console drivers may assume that per-cpu resources have * been allocated. So don't allow them to be called by this