Re: linux-next: build warning in Linus' tree

[Linus Torvalds]

On Thu, Oct 27, 2016 at 3:29 PM, Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> wrote:
>
> Building your tree, today's linux-next build (powerpc ppc64_defconfig)
> produced this warning:
>
> mm/memory_hotplug.c: In function 'try_offline_node':
> mm/memory_hotplug.c:2120:6: warning: unused variable 'i' [-Wunused-variable]
>  int i;
>      ^
>
> Introduced by commit
>
>   9dcb8b685fc3 ("mm: remove per-zone hashtable of bitlock waitqueues")

Strange. I wonder why I didn't see that warning. Not with
allmodconfig, and not with my normal build.

[ Looks around ]

Hmm. Apparently "allmodconfig" doesn't actually enable memory hotplug.
And the reason is that allmodconfig enables KASAN, which then disables
MEMORY_HOTPLUG.

I wonder if we should make KASAN depend on !COMPILE_TEST, because it
does seem to disable a lot of build-time testing.

Oh well. I'll remove the stupid unused variable, thanks for the heads-up.

          Linus