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SubjectRe: [rtc-linux] Re: [PATCH] rtc: Make rtc_update_irq callable with irqs enabled
On Thu, 23 Apr 2009 11:15:56 -0700
David Brownell <> wrote:

> On Thursday 23 April 2009, Alessandro Zummo wrote:
> >  Is not an API change, we are gradually relaxing it if it
> >  proves workable :)
> Erm, it *is* an API change at least to the extent that
> the last version of the patch made the interface spec
> become incorrect.

I know, I was just playing it down :)

> Current interface spec *requires* that function to be
> called with IRQs disabled.
> The downside of that spec is that there's no way to test
> it, since CONFIG_LOCKDEP doesn't understand that almost
> all IRQ handlers don't disable IRQs. So there are some
> bugs in RTC drivers that can only be uncovered by code
> review.

That's was what I was proposing. I'll give a code review
but will not be able to test every driver so I'll need
help from the authors.

But first I need someone to validate the theory that
says that we don't really need the IRQs to be disabled,
as I stated in the email to Andrew.

do you agree? :)


Best regards,

Alessandro Zummo,
Tower Technologies - Torino, Italy

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