From: Sebastian Andrzej Siewior Date: Wed, 7 Dec 2016 13:31:33 +0000 (+0100) Subject: tracing/rb: Init the CPU mask on allocation X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=99e6f6e8134b0c9d5d82eb2af1068a57199125e4;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git tracing/rb: Init the CPU mask on allocation Before commit b32614c03413 ("tracing/rb: Convert to hotplug state machine") the allocated cpumask was initialized to the mask of ONLINE or POSSIBLE CPUs. After the CPU hotplug changes the buffer initialisation moved to trace_rb_cpu_prepare() but I forgot to initially set the cpumask to zero. This is done now. Link: http://lkml.kernel.org/r/20161207133133.hzkcqfllxcdi3joz@linutronix.de Fixes: b32614c03413 ("tracing/rb: Convert to hotplug state machine") Reported-by: Tetsuo Handa Tested-by: Tetsuo Handa Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Steven Rostedt --- diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c index f17476f9d7f4..7edfd41d506c 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -1303,7 +1303,7 @@ struct ring_buffer *__ring_buffer_alloc(unsigned long size, unsigned flags, if (!buffer) return NULL; - if (!alloc_cpumask_var(&buffer->cpumask, GFP_KERNEL)) + if (!zalloc_cpumask_var(&buffer->cpumask, GFP_KERNEL)) goto fail_free_buffer; nr_pages = DIV_ROUND_UP(size, BUF_PAGE_SIZE);