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ARC: mm: switch pgtable_t back to struct page *

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So far ARC pgtable_t has not been struct page based to avoid extra
page_address() calls involved. However the differences are down to
noise and get in the way of using generic code, hence this patch.

This also allows us to reuse generic THP depost/withdraw code.

There's some additional consideration for PGDIR_SHIFT in 4K page config.
Now due to page tables being PAGE_SIZE deep only, the address split
can't be really arbitrary.

Tested-by: kernel test robot <lkp@intel.com>
Suggested-by: Mike Rapoport <rppt@linux.ibm.com>
Acked-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Vineet Gupta <vgupta@kernel.org>
This commit is contained in:
Vineet Gupta 2021-08-12 12:54:43 -07:00
parent f35534a2bc
commit d9820ff76f
6 changed files with 28 additions and 87 deletions
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3
arch/arc/mm/init.c
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@ -189,6 +189,9 @@ void __init mem_init(void)
{
memblock_free_all();
highmem_init();
BUILD_BUG_ON((PTRS_PER_PGD * sizeof(pgd_t)) > PAGE_SIZE);
BUILD_BUG_ON((PTRS_PER_PTE * sizeof(pte_t)) > PAGE_SIZE);
}
#ifdef CONFIG_HIGHMEM