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mm,thp: reduce ifdef'ery for THP in generic code
- pgtable-generic.c: Fold individual #ifdef for each helper into a top level #ifdef. Makes code more readable - Converted the stub helpers for !THP to BUILD_BUG() vs. runtime BUG() Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Link: http://lkml.kernel.org/r/20151009133450.GA8597@node Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
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Vineet Gupta
parent
52585bcc25
commit
bd5e88ad72
@ -30,9 +30,19 @@ extern int ptep_set_access_flags(struct vm_area_struct *vma,
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#endif
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#ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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extern int pmdp_set_access_flags(struct vm_area_struct *vma,
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unsigned long address, pmd_t *pmdp,
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pmd_t entry, int dirty);
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#else
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static inline int pmdp_set_access_flags(struct vm_area_struct *vma,
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unsigned long address, pmd_t *pmdp,
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pmd_t entry, int dirty)
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{
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BUILD_BUG();
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return 0;
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}
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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#endif
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#ifndef __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
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@ -64,12 +74,12 @@ static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma,
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set_pmd_at(vma->vm_mm, address, pmdp, pmd_mkold(pmd));
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return r;
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}
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#else /* CONFIG_TRANSPARENT_HUGEPAGE */
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#else
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static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma,
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unsigned long address,
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pmd_t *pmdp)
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{
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BUG();
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BUILD_BUG();
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return 0;
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}
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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@ -81,8 +91,21 @@ int ptep_clear_flush_young(struct vm_area_struct *vma,
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#endif
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#ifndef __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
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int pmdp_clear_flush_young(struct vm_area_struct *vma,
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unsigned long address, pmd_t *pmdp);
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
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unsigned long address, pmd_t *pmdp);
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#else
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/*
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* Despite relevant to THP only, this API is called from generic rmap code
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* under PageTransHuge(), hence needs a dummy implementation for !THP
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*/
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static inline int pmdp_clear_flush_young(struct vm_area_struct *vma,
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unsigned long address, pmd_t *pmdp)
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{
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BUILD_BUG();
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return 0;
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}
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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#endif
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#ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR
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@ -175,11 +198,11 @@ static inline void pmdp_set_wrprotect(struct mm_struct *mm,
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pmd_t old_pmd = *pmdp;
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set_pmd_at(mm, address, pmdp, pmd_wrprotect(old_pmd));
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}
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#else /* CONFIG_TRANSPARENT_HUGEPAGE */
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#else
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static inline void pmdp_set_wrprotect(struct mm_struct *mm,
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unsigned long address, pmd_t *pmdp)
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{
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BUG();
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BUILD_BUG();
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}
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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#endif
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@ -248,7 +271,7 @@ static inline int pmd_same(pmd_t pmd_a, pmd_t pmd_b)
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#else /* CONFIG_TRANSPARENT_HUGEPAGE */
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static inline int pmd_same(pmd_t pmd_a, pmd_t pmd_b)
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{
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BUG();
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BUILD_BUG();
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return 0;
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}
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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@ -82,12 +82,13 @@ pte_t ptep_clear_flush(struct vm_area_struct *vma, unsigned long address,
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}
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#endif
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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#ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
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int pmdp_set_access_flags(struct vm_area_struct *vma,
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unsigned long address, pmd_t *pmdp,
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pmd_t entry, int dirty)
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{
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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int changed = !pmd_same(*pmdp, entry);
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VM_BUG_ON(address & ~HPAGE_PMD_MASK);
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if (changed) {
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@ -95,10 +96,6 @@ int pmdp_set_access_flags(struct vm_area_struct *vma,
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flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
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}
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return changed;
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#else /* CONFIG_TRANSPARENT_HUGEPAGE */
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BUG();
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return 0;
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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}
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#endif
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@ -107,11 +104,7 @@ int pmdp_clear_flush_young(struct vm_area_struct *vma,
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unsigned long address, pmd_t *pmdp)
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{
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int young;
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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VM_BUG_ON(address & ~HPAGE_PMD_MASK);
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#else
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BUG();
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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young = pmdp_test_and_clear_young(vma, address, pmdp);
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if (young)
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flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
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@ -120,7 +113,6 @@ int pmdp_clear_flush_young(struct vm_area_struct *vma,
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#endif
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#ifndef __HAVE_ARCH_PMDP_HUGE_CLEAR_FLUSH
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma, unsigned long address,
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pmd_t *pmdp)
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{
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@ -131,11 +123,9 @@ pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma, unsigned long address,
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flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
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return pmd;
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}
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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#endif
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#ifndef __HAVE_ARCH_PMDP_SPLITTING_FLUSH
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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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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@ -145,11 +135,9 @@ void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address,
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/* tlb flush only to serialize against gup-fast */
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flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
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}
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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#endif
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#ifndef __HAVE_ARCH_PGTABLE_DEPOSIT
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
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pgtable_t pgtable)
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{
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@ -162,11 +150,9 @@ void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
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list_add(&pgtable->lru, &pmd_huge_pte(mm, pmdp)->lru);
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pmd_huge_pte(mm, pmdp) = pgtable;
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}
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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#endif
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#ifndef __HAVE_ARCH_PGTABLE_WITHDRAW
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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/* no "address" argument so destroys page coloring of some arch */
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pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
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{
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@ -185,11 +171,9 @@ pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
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}
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return pgtable;
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}
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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#endif
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#ifndef __HAVE_ARCH_PMDP_INVALIDATE
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
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pmd_t *pmdp)
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{
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@ -197,11 +181,9 @@ void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
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set_pmd_at(vma->vm_mm, address, pmdp, pmd_mknotpresent(entry));
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flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
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}
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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#endif
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#ifndef pmdp_collapse_flush
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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pmd_t pmdp_collapse_flush(struct vm_area_struct *vma, unsigned long address,
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pmd_t *pmdp)
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{
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@ -217,5 +199,5 @@ pmd_t pmdp_collapse_flush(struct vm_area_struct *vma, unsigned long address,
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flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
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return pmd;
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}
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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#endif
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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