Re: [PATCH 0/7] x86/UV/KDB/NMI: Updates for NMI/KDB handler for SGI UV

[Mike Travis <travis@sgi.com>]

On 9/24/2013 12:52 AM, Ingo Molnar wrote:
> 
> Hm, do you test-build your patches? 

Both build and test incessantly...

This series produces the following
> annoying warning:
> 
>  arch/x86/platform/uv/uv_nmi.c: In function ‘uv_nmi_setup’:
>  arch/x86/platform/uv/uv_nmi.c:664:2: warning: the address of ‘uv_nmi_cpu_mask’ will always evaluate as ‘true’ [-Waddress]

I didn't hit the above warning since I never tried building without
CONFIG_CPUMASK_OFFSTACK defined.  I wonder if uv_nmi.c should not
be built if not on an enterprise sized system?

> 
> This:
> 
>         alloc_cpumask_var(&uv_nmi_cpu_mask, GFP_KERNEL);
>         BUG_ON(!uv_nmi_cpu_mask);
> 
> 
> the way to check for allocation failures is by checking the return value 
> of alloc_cpumask_var():
> 
> 	BUG_ON(!alloc_cpumask_var(&uv_nmi_cpu_mask, GFP_KERNEL));
> 
> I've fixed this in the patch.

Thanks!!  I should have remembered this since it was my code. (doh!)
> 
> Thanks,
> 
> 	Ingo
>