linux-kernel - Re: [PATCH RFC V2 12/17] memremap: Add zone device access protection

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Date:   Fri, 17 Jul 2020 11:10:53 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     ira.weiny@...el.com
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>, x86@...nel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Fenghua Yu <fenghua.yu@...el.com>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-nvdimm@...ts.01.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH RFC V2 12/17] memremap: Add zone device access protection

On Fri, Jul 17, 2020 at 12:20:51AM -0700, ira.weiny@...el.com wrote:
> +static pgprot_t dev_protection_enable_get(struct dev_pagemap *pgmap, pgprot_t prot)
> +{
> +	if (pgmap->flags & PGMAP_PROT_ENABLED && dev_page_pkey != PKEY_INVALID) {
> +		pgprotval_t val = pgprot_val(prot);
> +
> +		static_branch_inc(&dev_protection_static_key);
> +		prot = __pgprot(val | _PAGE_PKEY(dev_page_pkey));
> +	}
> +	return prot;
> +}

Every other pgprot modifying function is called pgprot_*(), although I
suppose we have the exceptions phys_mem_access_prot() and dma_pgprot().

How about we call this one devm_pgprot() ?