Re: [PATCH V3 2/2] mm/mmap: Drop generic protection_map[] array

[hch@xxxxxxxxxxxxx]

On Thu, Jun 16, 2022 at 05:45:39AM +0000, Christophe Leroy wrote:
> > +/* Note due to the way vm flags are laid out, the bits are XWR */
> > +pgprot_t protection_map[16] = {
> 
> Was const previously, now back to non const ? Maybe due to a conflict 
> with linux/mm.h ? At least it should be __ro_after_init.

Maybe we just need to duplicate vm_get_page_prot in all the
architectures and thus avoid making protection_map global in a
common header entirely.  That certainly seems like the cleaner
interface.