On 6/24/22 10:42, Christoph Hellwig wrote:

On Fri, Jun 24, 2022 at 10:13:13AM +0530, Anshuman Khandual wrote:

quoted

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.