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Date: Fri, 24 Jun 2022 10:50:33 +0530
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Subject: Re: [PATCH V4 00/26] mm/mmap: Drop __SXXX/__PXXX macros from across
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To: Christoph Hellwig <hch@infradead.org>
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From: Anshuman Khandual <anshuman.khandual@arm.com>
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On 6/24/22 10:42, Christoph Hellwig wrote:
> On Fri, Jun 24, 2022 at 10:13:13AM +0530, Anshuman Khandual wrote:
>> vm_get_page_prot(), in order for it to be reused on platforms that do not
>> require custom implementation. Finally, ARCH_HAS_VM_GET_PAGE_PROT can just
>> be dropped, as all platforms now define and export vm_get_page_prot(), via
>> looking up a private and static protection_map[] array. protection_map[]
>> data type is the following for all platforms without deviation (except the
>> powerpc one which is shared between 32 and 64 bit platforms), keeping it
>> unchanged for now.
>>
>> static pgprot_t protection_map[16] __ro_after_init
> 
> On most architectures this should be const now, only very few ever
> modify it.

Will make it a 'static const pgprot_t protection_map[16] __ro_after_init'
on platforms that do not change the protection_map[] even during boot.