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Re: [PATCH 2/8] IRQ: generalize [gs]et_irq_regs()


  • To: Jan Beulich <jbeulich@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Thu, 11 Jan 2024 12:16:18 +0000
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  • Cc: George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>
  • Delivery-date: Thu, 11 Jan 2024 12:16:27 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 11/01/2024 7:32 am, Jan Beulich wrote:
> Move functions (and their data) to common code, and invoke the functions
> on Arm as well. This is in preparation of dropping the register
> parameters from handler functions.
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> with one wording
suggestion.

> ---
> To limit visibility of the per-CPU data item, we may want to consider
> making the functions out-of-line ones (in common/irq.c).

If we had working LTO, then maybe.  But we don't, and I think we can
reasonably cover (not using) this with normal code review.

> --- a/xen/include/xen/irq.h
> +++ b/xen/include/xen/irq.h
> @@ -131,6 +131,26 @@ void cf_check irq_actor_none(struct irq_
>  #define irq_disable_none irq_actor_none
>  #define irq_enable_none irq_actor_none
>  
> +/*
> + * Per-cpu interrupted context register state - the top-most interrupt frame
> + * on the stack.

The prior wording "last" wasn't great either.

I'd suggest "inner-most".  "top-most" comes with the usual confusions
with stacks being upside down, and inner/outer is more common
terminology with nesting.

~Andrew



 


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