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Date: Thu, 9 Mar 2017 15:53:21 +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 06/10] arm64/mmu: align alloc_init_pte prototype with
pmd/pud versions
On Thu, Mar 09, 2017 at 09:25:08AM +0100, Ard Biesheuvel wrote:
> Align the function prototype of alloc_init_pte() with its pmd and pud
> counterparts by replacing the pfn parameter with the equivalent physical
> address.
>
> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
> ---
> arch/arm64/mm/mmu.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
> index 75e21c33caff..c3963c592ec3 100644
> --- a/arch/arm64/mm/mmu.c
> +++ b/arch/arm64/mm/mmu.c
> @@ -107,7 +107,7 @@ static bool pgattr_change_is_safe(u64 old, u64 new)
> }
>
> static void alloc_init_pte(pmd_t *pmd, unsigned long addr,
> - unsigned long end, unsigned long pfn,
> + unsigned long end, phys_addr_t phys,
> pgprot_t prot,
> phys_addr_t (*pgtable_alloc)(void))
> {
> @@ -128,8 +128,8 @@ static void alloc_init_pte(pmd_t *pmd, unsigned long addr,
> do {
> pte_t old_pte = *pte;
>
> - set_pte(pte, pfn_pte(pfn, prot));
> - pfn++;
> + set_pte(pte, pfn_pte(__phys_to_pfn(phys), prot));
> + phys += PAGE_SIZE;
Minor nit: so as to align the strucutre of the loop with the other
functions, it'd be nice to have this on the final line of the loop body.
Either way:
Reviewed-by: Mark Rutland <mark.rutland@....com>
Mark.
>
> /*
> * After the PTE entry has been populated once, we
> @@ -182,7 +182,7 @@ static void alloc_init_pmd(pud_t *pud, unsigned long addr, unsigned long end,
> BUG_ON(!pgattr_change_is_safe(pmd_val(old_pmd),
> pmd_val(*pmd)));
> } else {
> - alloc_init_pte(pmd, addr, next, __phys_to_pfn(phys),
> + alloc_init_pte(pmd, addr, next, phys,
> prot, pgtable_alloc);
>
> BUG_ON(pmd_val(old_pmd) != 0 &&
> --
> 2.7.4
>
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