答复: [外部邮件] Re: [PATCH] x86/mce: Fix timer interval adjustment after logging a MCE event

[Li,Rongqing]

> 
> On 12.01.26 г. 10:27 ч., lirongqing wrote:
> > From: Li RongQing <lirongqing@xxxxxxxxx>
> >
> > Since commit 011d82611172 ("RAS: Add a Corrected Errors Collector"),
> > mce_notify_irq() in should_enable_timer() always returns false even
> 
> should_enable_timer doesn't call mce_notify_irq
> 
> > when an MCE event is logged, because bit 0 of mce_need_notify is not
> > set in mce_log. This prevents the timer interval from being properly
> > adjusted.
> >
> > Fix this by modifying machine_check_poll() to return a boolean
> > indicating whether an MCE was logged, and update mc_poll_banks() to
> > propagate this return value. The timer interval logic in
> > mce_timer_fn() now uses this return value directly instead of relying on
> mce_notify_irq().
> 
> This warrants a bit more explanation why it's correct. Because mce_notify_irq is
> really a misnomer, it will ideally be named mce_notify_user(). That function is
> called from 2 places:
> 
> 1. Early notifier block, but there it's guaranteed to do the right thing as
> mce_need_notify is explicitly set.
> 
> 2. From the timer function, where as you have pointed out mce_need_notify is
> never set by the polling code, hence the function is a noop. But actually calling
> mce_log() processes all logged errors in the gen pool and that is processed by
> calling the x86_mce_decoder_chain which will DTRT w.r.t to mce_notify_irq
> since the early notifier will be called from there.
> 
> <snip>

Ok, I will add more explanation, and rename mce_notify_irq() as mce_notify_user();

Thanks

-Li