linux-kernel - Re: [PATCH v12 07/11] mm: Add address parameter to arch_validate

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Date:   Mon, 26 Feb 2018 16:54:12 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Khalid Aziz <khalid.aziz@...cle.com>, akpm@...ux-foundation.org,
        benh@...nel.crashing.org, paulus@...ba.org, davem@...emloft.net,
        dave.hansen@...ux.intel.com
Cc:     Khalid Aziz <khalid.aziz@...cle.com>, bsingharora@...il.com,
        nborisov@...e.com, aarcange@...hat.com, anthony.yznaga@...cle.com,
        mgorman@...e.de, linuxram@...ibm.com,
        kirill.shutemov@...ux.intel.com, dan.j.williams@...el.com,
        jack@...e.cz, ross.zwisler@...ux.intel.com,
        gregkh@...uxfoundation.org, tglx@...utronix.de, mhocko@...e.com,
        n-horiguchi@...jp.nec.com, jglisse@...hat.com,
        henry.willard@...cle.com, aneesh.kumar@...ux.vnet.ibm.com,
        khandual@...ux.vnet.ibm.com, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        sparclinux@...r.kernel.org, Khalid Aziz <khalid@...ehiking.org>
Subject: Re: [PATCH v12 07/11] mm: Add address parameter to arch_validate_prot()

Khalid Aziz <khalid.aziz@...cle.com> writes:

> A protection flag may not be valid across entire address space and
> hence arch_validate_prot() might need the address a protection bit is
> being set on to ensure it is a valid protection flag. For example, sparc
> processors support memory corruption detection (as part of ADI feature)
> flag on memory addresses mapped on to physical RAM but not on PFN mapped
> pages or addresses mapped on to devices. This patch adds address to the
> parameters being passed to arch_validate_prot() so protection bits can
> be validated in the relevant context.
>
> Signed-off-by: Khalid Aziz <khalid.aziz@...cle.com>
> Cc: Khalid Aziz <khalid@...ehiking.org>
> Reviewed-by: Anthony Yznaga <anthony.yznaga@...cle.com>
> ---
> v8:
> 	- Added addr parameter to powerpc arch_validate_prot() (suggested
> 	  by Michael Ellerman)
> v9:
> 	- new patch
>
>  arch/powerpc/include/asm/mman.h | 4 ++--
>  arch/powerpc/kernel/syscalls.c  | 2 +-

These changes look fine to me:

Acked-by: Michael Ellerman <mpe@...erman.id.au> (powerpc)

cheers