Re: [PATCH v6 1/3] rust: Introduce irq module
From: Lyude Paul
Date: Fri Oct 04 2024 - 13:18:42 EST
On Fri, 2024-10-04 at 08:58 +0000, Benno Lossin wrote:
> On 02.10.24 22:20, Thomas Gleixner wrote:
> > On Mon, Sep 16 2024 at 17:28, Lyude Paul wrote:
> > >
> >
> > And here you open code the check which is in IrqDisabled::new()
> >
> > So I'd rather see this as:
> >
> > token = unsafe { IrqDisabled::new() };
> > let ret = cb(token);
> > assert_valid(token);
> >
> > I might misunderstand rust here, but the provided code does not make
> > sense to me.
>
> The purpose of this check is to catch any dumb implementations of the
> closure `cb` passed to the function. For example
>
> with_irqs_disabled(|irq| {
> let guard = spin_lock_irq.lock(irq); // lock a spinlock with IRQ disabled
> unsafe { enable_irq() };
> drop(guard); // unlock it with IRQ being enabled
> });
>
> The debug assert would catch this error.
>
>
> Of course we can move the debug assert into its own function taking the
> token. I think it's a good idea.
I'm fine with this - we could add a method to IrqDisabled itself to do an
assertion for this.
>
> ---
> Cheers,
> Benno
>
--
Cheers,
Lyude Paul (she/her)
Software Engineer at Red Hat
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