Sebastian Andrzej Siewior wrote:
> 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.
>
> Fixes: b32614c03413 ("tracing/rb: Convert to hotplug state machine")
> Reported-by: Tetsuo Handa <[email protected]>
> Signed-off-by: Sebastian Andrzej Siewior <[email protected]>
The system can boot now. Thank you.
Tested-by: Tetsuo Handa <[email protected]>
> ---
> kernel/trace/ring_buffer.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
> index 67da107e5712..a85739efcc30 100644
> --- a/kernel/trace/ring_buffer.c
> +++ b/kernel/trace/ring_buffer.c
> @@ -1297,7 +1297,7 @@ 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);
> --
> 2.11.0
