From: Steven Price <steven.price@arm.com>
To: Robin Murphy <robin.murphy@arm.com>,
Anshuman Khandual <anshuman.khandual@arm.com>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org,
akpm@linux-foundation.org, will.deacon@arm.com,
catalin.marinas@arm.com
Cc: mark.rutland@arm.com, mhocko@suse.com, david@redhat.com,
logang@deltatee.com, cai@lca.pw, pasha.tatashin@oracle.com,
james.morse@arm.com, cpandya@codeaurora.org,
arunks@codeaurora.org, dan.j.williams@intel.com,
mgorman@techsingularity.net, osalvador@suse.de
Subject: Re: [PATCH 2/6] arm64/mm: Enable memory hot remove
Date: Wed, 3 Apr 2019 14:15:01 +0100 [thread overview]
Message-ID: <e191ddcb-271c-57f3-091f-eacaac2e86e0@arm.com> (raw)
In-Reply-To: <ed4ceac4-b92c-47f4-33b0-ed1d0833b40d@arm.com>
On 03/04/2019 13:37, Robin Murphy wrote:
> [ +Steve ]
>
> Hi Anshuman,
>
> On 03/04/2019 05:30, Anshuman Khandual wrote:
<snip>
>> diff --git a/arch/arm64/include/asm/pgtable.h
>> b/arch/arm64/include/asm/pgtable.h
>> index de70c1e..858098e 100644
>> --- a/arch/arm64/include/asm/pgtable.h
>> +++ b/arch/arm64/include/asm/pgtable.h
>> @@ -355,6 +355,18 @@ static inline int pmd_protnone(pmd_t pmd)
>> }
>> #endif
>> +#if (CONFIG_PGTABLE_LEVELS > 2)
>> +#define pmd_large(pmd) (pmd_val(pmd) && !(pmd_val(pmd) &
>> PMD_TABLE_BIT))
>> +#else
>> +#define pmd_large(pmd) 0
>> +#endif
>> +
>> +#if (CONFIG_PGTABLE_LEVELS > 3)
>> +#define pud_large(pud) (pud_val(pud) && !(pud_val(pud) &
>> PUD_TABLE_BIT))
>> +#else
>> +#define pud_large(pmd) 0
>> +#endif
>
> These seem rather different from the versions that Steve is proposing in
> the generic pagewalk series - can you reach an agreement on which
> implementation is preferred?
Indeed this doesn't match the version in my series although is quite
similar.
My desire is that p?d_large represents the hardware architectural
definition of large page/huge page/section (pick your naming). Although
now I look more closely this is actually broken in my series (I'll fix
that up and send a new version shortly) - p?d_sect() is similarly
conditional.
Is there a good reason not to use the existing p?d_sect() macros
available on arm64?
I'm also surprised by the CONFIG_PGTABLE_LEVEL conditions as they don't
match the existing conditions for p?d_sect(). Might be worth double
checking it actually does what you expect.
Steve
next prev parent reply other threads:[~2019-04-03 13:15 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-03 4:30 [PATCH 0/6] arm64/mm: Enable memory hot remove and ZONE_DEVICE Anshuman Khandual
2019-04-03 4:30 ` [PATCH 1/6] arm64/mm: Enable sysfs based memory hot add interface Anshuman Khandual
2019-04-03 8:20 ` David Hildenbrand
2019-04-03 13:12 ` Robin Murphy
2019-04-04 5:21 ` Anshuman Khandual
2019-04-04 5:25 ` Anshuman Khandual
2019-04-04 8:49 ` David Hildenbrand
2019-04-03 4:30 ` [PATCH 2/6] arm64/mm: Enable memory hot remove Anshuman Khandual
2019-04-03 12:37 ` Robin Murphy
2019-04-03 13:15 ` Steven Price [this message]
2019-04-04 6:51 ` Anshuman Khandual
2019-04-04 5:39 ` Anshuman Khandual
2019-04-04 11:58 ` Oscar Salvador
2019-04-04 13:03 ` Anshuman Khandual
2019-04-04 15:19 ` Oscar Salvador
2019-04-03 17:32 ` Logan Gunthorpe
2019-04-03 17:57 ` Robin Murphy
2019-04-04 8:23 ` Anshuman Khandual
2019-04-04 7:07 ` Anshuman Khandual
2019-04-04 9:16 ` Steven Price
2019-04-03 4:30 ` [PATCH 3/6] arm64/mm: Enable struct page allocation from device memory Anshuman Khandual
2019-04-03 4:30 ` [PATCH 4/6] mm/hotplug: Reorder arch_remove_memory() call in __remove_memory() Anshuman Khandual
2019-04-03 8:45 ` Oscar Salvador
2019-04-03 9:17 ` Michal Hocko
2019-04-04 8:32 ` Anshuman Khandual
2019-04-03 9:30 ` David Hildenbrand
2019-04-03 4:30 ` [PATCH 5/6] mm/memremap: Rename and consolidate SECTION_SIZE Anshuman Khandual
2019-04-03 9:26 ` Michal Hocko
2019-04-03 9:30 ` David Hildenbrand
2019-04-03 4:30 ` [PATCH 6/6] arm64/mm: Enable ZONE_DEVICE Anshuman Khandual
2019-04-03 13:58 ` Robin Murphy
2019-04-03 16:07 ` Jerome Glisse
2019-04-04 5:03 ` Anshuman Khandual
2019-04-04 4:42 ` Anshuman Khandual
2019-04-04 5:04 ` Dan Williams
2019-04-04 9:46 ` Robin Murphy
2019-04-07 22:11 ` Dan Williams
2019-04-08 4:03 ` Ira Weiny
2019-04-08 6:03 ` Anshuman Khandual
2019-04-03 18:08 ` [PATCH 0/6] arm64/mm: Enable memory hot remove and ZONE_DEVICE Dan Williams
2019-04-04 13:11 ` Anshuman Khandual
2019-04-04 9:46 ` [RFC 1/2] mm/vmemmap: Enable vmem_altmap based base page mapping for vmemmap Anshuman Khandual
2019-04-04 9:46 ` [RFC 2/2] arm64/mm: Enable ZONE_DEVICE for all page configs Anshuman Khandual
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