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    Subject[PATCHv12 17/37] arm64, thp: remove infrastructure for handling splitting PMDs
    Date
    With new refcounting we don't need to mark PMDs splitting. Let's drop
    code to handle this.

    pmdp_splitting_flush() is not needed too: on splitting PMD we will do
    pmdp_clear_flush() + set_pte_at(). pmdp_clear_flush() will do IPI as
    needed for fast_gup.

    Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
    ---
    arch/arm64/include/asm/pgtable.h | 8 --------
    arch/arm64/mm/flush.c | 16 ----------------
    2 files changed, 24 deletions(-)

    diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
    index bd5db28324ba..26c7dea80062 100644
    --- a/arch/arm64/include/asm/pgtable.h
    +++ b/arch/arm64/include/asm/pgtable.h
    @@ -274,20 +274,12 @@ static inline pgprot_t mk_sect_prot(pgprot_t prot)

    #ifdef CONFIG_TRANSPARENT_HUGEPAGE
    #define pmd_trans_huge(pmd) (pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT))
    -#define pmd_trans_splitting(pmd) pte_special(pmd_pte(pmd))
    -#ifdef CONFIG_HAVE_RCU_TABLE_FREE
    -#define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
    -struct vm_area_struct;
    -void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address,
    - pmd_t *pmdp);
    -#endif /* CONFIG_HAVE_RCU_TABLE_FREE */
    #endif /* CONFIG_TRANSPARENT_HUGEPAGE */

    #define pmd_dirty(pmd) pte_dirty(pmd_pte(pmd))
    #define pmd_young(pmd) pte_young(pmd_pte(pmd))
    #define pmd_dirty(pmd) pte_dirty(pmd_pte(pmd))
    #define pmd_wrprotect(pmd) pte_pmd(pte_wrprotect(pmd_pte(pmd)))
    -#define pmd_mksplitting(pmd) pte_pmd(pte_mkspecial(pmd_pte(pmd)))
    #define pmd_mkold(pmd) pte_pmd(pte_mkold(pmd_pte(pmd)))
    #define pmd_mkwrite(pmd) pte_pmd(pte_mkwrite(pmd_pte(pmd)))
    #define pmd_mkclean(pmd) pte_pmd(pte_mkclean(pmd_pte(pmd)))
    diff --git a/arch/arm64/mm/flush.c b/arch/arm64/mm/flush.c
    index 4dfa3975ce5b..fc9c657e6f41 100644
    --- a/arch/arm64/mm/flush.c
    +++ b/arch/arm64/mm/flush.c
    @@ -103,19 +103,3 @@ EXPORT_SYMBOL(flush_dcache_page);
    * Additional functions defined in assembly.
    */
    EXPORT_SYMBOL(flush_icache_range);
    -
    -#ifdef CONFIG_TRANSPARENT_HUGEPAGE
    -#ifdef CONFIG_HAVE_RCU_TABLE_FREE
    -void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address,
    - pmd_t *pmdp)
    -{
    - pmd_t pmd = pmd_mksplitting(*pmdp);
    -
    - VM_BUG_ON(address & ~PMD_MASK);
    - set_pmd_at(vma->vm_mm, address, pmdp, pmd);
    -
    - /* dummy IPI to serialise against fast_gup */
    - kick_all_cpus_sync();
    -}
    -#endif /* CONFIG_HAVE_RCU_TABLE_FREE */
    -#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
    --
    2.5.3


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