Re: [PATCH v9 1/9] preempt: Introduce HARDIRQ_DISABLE_BITS

[Boqun Feng]

On Thu, Feb 27, 2025 at 06:09:16PM -0500, Steven Rostedt wrote:
> On Thu, 27 Feb 2025 17:10:12 -0500
> Lyude Paul <lyude@xxxxxxxxxx> wrote:
> 
> > From: Boqun Feng <boqun.feng@xxxxxxxxx>
> 
> -ENOCHANGLOG
> 

Yeah, sorry, I forget to add them or ask Lyude to add when handing over
patches.

Lyude, could you add below in the future version?


In order to support preempt_disable()-like interrupt disabling, that is,
using part of preempt_count() to track interrupt disabling nested level,  
change the preempt_count() layout to contain 8-bit HARDIRQ_DISABLE
count.

Note that HARDIRQ_BITS and NMI_BITS are reduced by 1 because of this,
and it changes the maximum of their (hardirq and nmi) nesting level.


(I will add patch #2's commit log shortly)

Regards,
Boqun

> Why is this patch needed?
> 
> -- Steve
> 
> > 
> > Signed-off-by: Boqun Feng <boqun.feng@xxxxxxxxx>
> > Signed-off-by: Lyude Paul <lyude@xxxxxxxxxx>