Re: [patch 1/3] x86/msi: Make irq_retrigger() functional for posted MSI

[Luigi Rizzo]

On Tue, Nov 25, 2025 at 11:20 AM Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote:
>
> Luigi reported that retriggering a posted MSI interrupt does not work
> correctly.
> [...]
>
> So instead of playing games with the PIR, this can be actually solved
> for both cases by:
>
>  1) Keeping track of the posted interrupt vector handler state

Tangential comment, but I see that this patch uses this_cpu_read()/write()
whereas the rest of the file uses __this_cpu_read()/write()

Given where they are used and the operand size, do we care about
preemption/interrupt protection, or the (possibly marginal) extra cost ?

cheers
luigi