Re: [Xen-devel] [PATCH v5 2/2] x86: add accessors for scratch cpu mask

[Jan Beulich <jbeulich@xxxxxxxx>]

On 28.02.2020 13:07, Roger Pau Monne wrote:
> Current usage of the per-CPU scratch cpumask is dangerous since
> there's no way to figure out if the mask is already being used except
> for manual code inspection of all the callers and possible call paths.
> 
> This is unsafe and not reliable, so introduce a minimal get/put
> infrastructure to prevent nested usage of the scratch mask and usage
> in interrupt context.
> 
> Move the declaration of scratch_cpumask to smp.c in order to place the
> declaration and the accessors as close as possible.
> 
> Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>

Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>

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