Re: linux-next: build warning after merge of the tip tree

[Liang, Kan]

On 2024-09-11 1:38 a.m., Stephen Rothwell wrote:
> Hi all,
> 
> After merging the tip tree, today's linux-next build (arm
> multi_v7_defconfig) produced this warning:
> 
> kernel/events/core.c: In function 'perf_event_setup_cpumask':
> kernel/events/core.c:14012:13: warning: the comparison will always evaluate as 'true' for the address of 'thread_sibling' will never be NULL [-Waddress]
> 14012 |         if (!topology_sibling_cpumask(cpu)) {
>       |             ^
> In file included from include/linux/topology.h:30,
>                  from include/linux/gfp.h:8,
>                  from include/linux/xarray.h:16,
>                  from include/linux/list_lru.h:14,
>                  from include/linux/fs.h:13,
>                  from kernel/events/core.c:11:
> include/linux/arch_topology.h:78:19: note: 'thread_sibling' declared here
>    78 |         cpumask_t thread_sibling;
>       |                   ^~~~~~~~~~~~~~
> 
> Introduced by commit
> 
>   4ba4f1afb6a9 ("perf: Generic hotplug support for a PMU with a scope")
> 

The patch to fix the warning has been posted.
https://lore.kernel.org/lkml/20240912145025.1574448-1-kan.liang@xxxxxxxxxxxxxxx/

Please give it a try.

Thanks,
Kan