Re: [Xen-devel] [PATCH v5 4/4] x86/smp: do not use scratch_cpumask when in interrupt or exception context

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Wed, Feb 26, 2020 at 02:10:44PM +0100, Jan Beulich wrote:
> On 26.02.2020 13:38, Roger Pau Monne wrote:
> > Using scratch_cpumask in send_IPI_mask is not safe in IRQ or exception
> > context because it can nest, and hence send_IPI_mask could be
> > overwriting another user scratch cpumask data when used in such
> > contexts.
> > 
> > Instead introduce a new cpumask to be used by send_IPI_mask, and
> > disable interrupts while using it.
> 
> With this now apparently stale sentence dropped (easily done
> while committing)

Uh, I thought I fixed the commit message, but looks like I missed that
bit.

Thanks.

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