RE: [patch V2 03/13] x86/irq/64: Adjust the per CPU irq stack pointer by 8

[David Laight]

From: Thomas Gleixner
> Sent: 09 February 2021 23:41
> From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> 
> The per CPU hardirq_stack_ptr contains the pointer to the irq stack in the
> form that it is ready to be assigned to [ER]SP so that the first push ends
> up on the top entry of the stack.
...
> Do the -8 adjustment right when storing the pointer and make the data type
> a void pointer to avoid confusion vs. the struct irq_stack data type which
> is on 64bit only used to declare the backing store...

It might be better to make it a pointer to an undefined struct.
That will stop all accidental assignments - except those that
are already 'void *'.

	David

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