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Date: Thu, 9 Mar 2017 18:19:53 +0000
From: Mark Rutland <mark.rutland@....com>
To: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc: linux-arm-kernel@...ts.infradead.org, keescook@...omium.org,
labbott@...oraproject.org, kernel-hardening@...ts.openwall.com,
will.deacon@....com, catalin.marinas@....com,
kvmarm@...ts.cs.columbia.edu, marc.zyngier@....com
Subject: Re: [PATCH v5 09/10] arm64/mmu: replace 'page_mappings_only'
parameter with flags argument
On Thu, Mar 09, 2017 at 09:25:11AM +0100, Ard Biesheuvel wrote:
> In preparation of extending the policy for manipulating kernel mappings
> with whether or not contiguous hints may be used in the page tables,
> replace the bool 'page_mappings_only' with a flags field and a flag
> NO_BLOCK_MAPPINGS.
>
> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Thanks for attacking this.
I was going to comment on the name change, but I see that the next patch
introduces and uses NO_CONT_MAPPINGS, so that's fine by me.
> void __init create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys,
> unsigned long virt, phys_addr_t size,
> pgprot_t prot, bool page_mappings_only)
> {
> + int flags;
> +
> BUG_ON(mm == &init_mm);
>
> + if (page_mappings_only)
> + flags = NO_BLOCK_MAPPINGS;
> +
> __create_pgd_mapping(mm->pgd, phys, virt, size, prot,
> - pgd_pgtable_alloc, page_mappings_only);
> + pgd_pgtable_alloc, flags);
> }
Given we can't pass the flags in to create_pgd_mapping() without
exposing those more generally, this also looks fine.
FWIW:
Reviewed-by: Mark Rutland <mark.rutland@....com>
Mark.
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