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

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Date:   Tue, 6 Mar 2018 14:48:07 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Khalid Aziz <khalid.aziz@...cle.com>
Cc:     benh@...nel.crashing.org, paulus@...ba.org, mpe@...erman.id.au,
        davem@...emloft.net, dave.hansen@...ux.intel.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()

On Wed, 21 Feb 2018 10:15:49 -0700 Khalid Aziz <khalid.aziz@...cle.com> wrote:

> 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>

Acked-by: Andrew Morton <akpm@...ux-foundation.org>