linux-dev/arch/arc/include/asm/pgtable-levels.h, branch linus/master

arc: drop definitions of pgd_index() and pgd_offset{, _k}() entirely

2022-04-18T21:44:12Z

They were in and have been removed from there in 974b9b2c68f ("mm: consolidate pte_index() and pte_offset_*() definitions") in favor of the generic version. But that missed that the same definitons also existed in , where they were (inadvertently?) introduced in fe6cb7b043b6 ("ARC: mm: disintegrate pgtable.h into levels and flags"). Fixes: 974b9b2c68f3 ("mm: consolidate pte_index() and pte_offset_*() definitions") Fixes: fe6cb7b043b6 ("ARC: mm: disintegrate pgtable.h into levels and flags") Signed-off-by: Rolf Eike Beer Signed-off-by: Vineet Gupta

arch: Add pmd_pfn() where it is missing

2022-03-21T16:59:02Z

We need to use this function in common code, so define it for architectures and/or configrations that miss it. The result of pmd_pfn() will only be used if TRANSPARENT_HUGEPAGE is enabled, but a function or macro called pmd_pfn() must be defined, even on machines with two level page tables. Signed-off-by: Mike Rapoport Signed-off-by: Matthew Wilcox (Oracle)

ARC: mm: support 4 levels of page tables

2021-08-26T20:43:19Z

Acked-by: Mike Rapoport Signed-off-by: Vineet Gupta

ARC: mm: support 3 levels of page tables

2021-08-26T20:43:19Z

ARCv2 MMU is software walked and Linux implements 2 levels of paging: pgd/pte. Forthcoming hw will have multiple levels, so this change preps mm code for same. It is also fun to try multi levels even on soft-walked code to ensure generic mm code is robust to handle. overview ________ 2 levels {pgd, pte} : pmd is folded but pmd_* macros are valid and operate on pgd 3 levels {pgd, pmd, pte}: - pud is folded and pud_* macros point to pgd - pmd_* macros operate on actual pmd code changes ____________ 1. #include 2. Define CONFIG_PGTABLE_LEVELS 3 3a. Define PMD_SHIFT, PMD_SIZE, PMD_MASK, pmd_t 3b. Define pmd_val() which actually deals with pmd (pmd_offset(), pmd_index() are provided by generic code) 3c. pmd_alloc_one()/pmd_free() also provided by generic code (pmd_populate/pmd_free already exist) 4. Define pud_none(), pud_bad() macros based on generic pud_val() which internally pertains to pgd now. 4b. define pud_populate() to just setup pgd Acked-by: Mike Rapoport Signed-off-by: Vineet Gupta

ARC: mm: switch pgtable_t back to struct page *

2021-08-26T20:42:42Z

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 Suggested-by: Mike Rapoport Acked-by: Mike Rapoport Signed-off-by: Vineet Gupta

ARC: mm: disintegrate pgtable.h into levels and flags

2021-08-25T22:53:19Z

- pgtable-bits-arcv2.h (MMU specific page table flags) - pgtable-levels.h (paging levels) No functional changes, but paves way for easy addition of new MMU code with different bits and levels etc Signed-off-by: Vineet Gupta