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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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8
arch/arc/include/asm/pgtable-levels.h
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@@ -35,9 +35,15 @@
#else
/*
* No Super page case
* Default value provides 11:8:13 (8K), 11:9:12 (4K)
* Default value provides 11:8:13 (8K), 10:10:12 (4K)
* Limits imposed by pgtable_t only PAGE_SIZE long
* (so 4K page can only have 1K entries: or 10 bits)
*/
#ifdef CONFIG_ARC_PAGE_SIZE_4K
#define PGDIR_SHIFT 22
#else
#define PGDIR_SHIFT 21
#endif
#endif