From: Paul Mackerras <paulus@ozlabs.org>
To: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: benh@kernel.crashing.org, mpe@ellerman.id.au,
linuxppc-dev@lists.ozlabs.org
Subject: Re: [RFC PATCH 1/2] powerpc/mm: Update prot_none implementation using _PAGE_READ
Date: Wed, 2 Mar 2016 12:39:20 +1100 [thread overview]
Message-ID: <20160302013920.GC3160@oak.ozlabs.ibm.com> (raw)
In-Reply-To: <1456456850-2679-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com>
Another thing:
On Fri, Feb 26, 2016 at 08:50:49AM +0530, Aneesh Kumar K.V wrote:
> --- a/arch/powerpc/mm/hash_utils_64.c
> +++ b/arch/powerpc/mm/hash_utils_64.c
> @@ -173,9 +173,11 @@ unsigned long htab_convert_pte_flags(unsigned long pteflags)
> * and there is no kernel RO (_PAGE_KERNEL_RO).
> * User area is mapped with PP=0x2 for read/write
> * or PP=0x3 for read-only (including writeable but clean pages).
> + * We also map user prot none as with PP=00.
> */
> if (pteflags & _PAGE_USER) {
> - rflags |= 0x2;
> + if ((pteflags & _PAGE_READ) || (pteflags & _PAGE_RW))
> + rflags |= 0x2;
You need to check _PAGE_EXEC too here. I would do:
if (pteflags & (_PAGE_READ | _PAGE_RW | _PAGE_EXEC))
rflags |= 0x2;
Paul.
prev parent reply other threads:[~2016-03-02 1:39 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-26 3:20 [RFC PATCH 1/2] powerpc/mm: Update prot_none implementation using _PAGE_READ Aneesh Kumar K.V
2016-02-26 3:20 ` [RFC PATCH 2/2] powerpc/mm: Replace _PAGE_USER with _PAGE_PRIV Aneesh Kumar K.V
2016-02-29 2:36 ` Benjamin Herrenschmidt
2016-02-29 7:49 ` Aneesh Kumar K.V
2016-03-02 1:07 ` Paul Mackerras
2016-03-05 8:29 ` Aneesh Kumar K.V
2016-03-05 10:41 ` Paul Mackerras
2016-03-02 0:38 ` [RFC PATCH 1/2] powerpc/mm: Update prot_none implementation using _PAGE_READ Paul Mackerras
2016-03-02 1:39 ` Paul Mackerras [this message]
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