Re: [PATCH v3 06/15] powerpc/32: prepare for CONFIG_VMAP_STACK

[Christophe Leroy]

Le 17/10/2019 Ã 09:36, Andrew Donnellan a ÃcritÂ:
> On 10/9/19 7:16 pm, Christophe Leroy wrote:
> > +#if defined(CONFIG_VMAP_STACK) && CONFIG_THREAD_SHIFT < PAGE_SHIFT
> > +#define THREAD_SHIFTÂÂÂÂÂÂÂ PAGE_SHIFT
> > +#else
> > Â #define THREAD_SHIFTÂÂÂÂÂÂÂ CONFIG_THREAD_SHIFT
> > +#endif
> >
> > Â #define THREAD_SIZEÂÂÂÂÂÂÂ (1 << THREAD_SHIFT)
>
> Looking at 64-bit book3s: with 64K pages, this results in a THREAD_SIZE 
> that's too large for immediate mode arithmetic operations, which is 
> annoying. Hmm.

Which operation are you thinking about ?

For instance, 'addi' can't be used anymore, but 'addis' can.

Christophe