From: Dave Hansen <dave.hansen@intel.com>
To: Ram Pai <linuxram@us.ibm.com>
Cc: mpe@ellerman.id.au, mingo@redhat.com, akpm@linux-foundation.org,
linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org,
x86@kernel.org, linux-arch@vger.kernel.org,
linux-kernel@vger.kernel.org, benh@kernel.crashing.org,
paulus@samba.org, khandual@linux.vnet.ibm.com,
aneesh.kumar@linux.vnet.ibm.com, bsingharora@gmail.com,
hbabu@us.ibm.com, mhocko@kernel.org, bauerman@linux.vnet.ibm.com,
ebiederm@xmission.com, corbet@lwn.net, arnd@arndb.de
Subject: Re: [PATCH v13 3/3] mm, powerpc, x86: introduce an additional vma bit for powerpc pkey
Date: Fri, 4 May 2018 21:42:39 -0700 [thread overview]
Message-ID: <7d1de723-f001-ebbe-6026-91bef88c566d@intel.com> (raw)
In-Reply-To: <20180505011243.GB5617@ram.oc3035372033.ibm.com>
On 05/04/2018 06:12 PM, Ram Pai wrote:
>> That new line boils down to:
>>
>> [ilog2(0)] = "",
>>
>> on x86. It wasn't *obvious* to me that it is OK to do that. The other
>> possibly undefined bits (VM_SOFTDIRTY for instance) #ifdef themselves
>> out of this array.
>>
>> I would just be a wee bit worried that this would overwrite the 0 entry
>> ("??") with "".
> Yes it would :-( and could potentially break anything that depends on
> 0th entry being "??"
>
> Is the following fix acceptable?
>
> #if VM_PKEY_BIT4
> [ilog2(VM_PKEY_BIT4)] = "",
> #endif
Yep, I think that works for me.
next prev parent reply other threads:[~2018-05-05 4:42 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-04 21:59 [PATCH v13 0/3] mm, x86, powerpc: Enhancements to Memory Protection Keys Ram Pai
2018-05-04 21:59 ` [PATCH v13 1/3] mm, powerpc, x86: define VM_PKEY_BITx bits if CONFIG_ARCH_HAS_PKEYS is enabled Ram Pai
2018-05-04 21:59 ` [PATCH v13 3/3] mm, powerpc, x86: introduce an additional vma bit for powerpc pkey Ram Pai
2018-05-04 22:57 ` Dave Hansen
2018-05-05 1:12 ` Ram Pai
2018-05-05 4:42 ` Dave Hansen [this message]
2018-05-04 21:59 ` [PATCH v11 3/3] mm, x86, powerpc: display pkey in smaps only if arch supports pkeys Ram Pai
2018-05-08 14:39 ` [PATCH v13 0/3] mm, x86, powerpc: Enhancements to Memory Protection Keys Michael Ellerman
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