forked from Minki/linux
arm64, thp: remove infrastructure for handling splitting PMDs
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> Cc: Sasha Levin <sasha.levin@oracle.com> Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Cc: Jerome Marchand <jmarchan@redhat.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Hugh Dickins <hughd@google.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Rik van Riel <riel@redhat.com> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Steve Capper <steve.capper@linaro.org> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@suse.cz> Cc: Christoph Lameter <cl@linux.com> Cc: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -353,19 +353,11 @@ static inline pgprot_t mk_sect_prot(pgprot_t prot)
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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#define pmd_trans_huge(pmd) (pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT))
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#define pmd_trans_splitting(pmd) pte_special(pmd_pte(pmd))
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#ifdef CONFIG_HAVE_RCU_TABLE_FREE
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#define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
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struct vm_area_struct;
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void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address,
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pmd_t *pmdp);
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#endif /* CONFIG_HAVE_RCU_TABLE_FREE */
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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#define pmd_dirty(pmd) pte_dirty(pmd_pte(pmd))
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#define pmd_young(pmd) pte_young(pmd_pte(pmd))
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#define pmd_wrprotect(pmd) pte_pmd(pte_wrprotect(pmd_pte(pmd)))
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#define pmd_mksplitting(pmd) pte_pmd(pte_mkspecial(pmd_pte(pmd)))
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#define pmd_mkold(pmd) pte_pmd(pte_mkold(pmd_pte(pmd)))
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#define pmd_mkwrite(pmd) pte_pmd(pte_mkwrite(pmd_pte(pmd)))
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#define pmd_mkdirty(pmd) pte_pmd(pte_mkdirty(pmd_pte(pmd)))
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@ -102,19 +102,3 @@ EXPORT_SYMBOL(flush_dcache_page);
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* Additional functions defined in assembly.
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*/
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EXPORT_SYMBOL(flush_icache_range);
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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#ifdef CONFIG_HAVE_RCU_TABLE_FREE
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void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address,
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pmd_t *pmdp)
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{
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pmd_t pmd = pmd_mksplitting(*pmdp);
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VM_BUG_ON(address & ~PMD_MASK);
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set_pmd_at(vma->vm_mm, address, pmdp, pmd);
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/* dummy IPI to serialise against fast_gup */
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kick_all_cpus_sync();
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}
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#endif /* CONFIG_HAVE_RCU_TABLE_FREE */
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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