linux-kernel - Re: [PATCH V3 2/2] mm/mmap: Drop generic protection

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Date:   Wed, 15 Jun 2022 23:12:13 -0700
From:   "hch@...radead.org" <hch@...radead.org>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     Anshuman Khandual <anshuman.khandual@....com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "hch@...radead.org" <hch@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        kernel test robot <lkp@...el.com>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH V3 2/2] mm/mmap: Drop generic protection_map[] array

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.