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Date: Fri, 9 Oct 2015 18:34:10 +0530
From: Vineet Gupta <Vineet.Gupta1@...opsys.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
CC: <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>
Subject: Re: [PATCH v3] mm,thp: reduce ifdef'ery for THP in generic code
On Friday 09 October 2015 05:13 PM, Vineet Gupta wrote:
> - 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()
>
> Signed-off-by: Vineet Gupta <vgupta@...opsys.com>
Sorry for sounding pushy - an Ack here will unblock me from dumping boat load of
patches into linux-next via my tree !
Thx,
-Vineet
> ---
> Somehow the msg didn't make it to mailing list !
> ---
> include/asm-generic/pgtable.h | 37 ++++++++++++++++++++++++++++++-------
> mm/pgtable-generic.c | 24 +++---------------------
> 2 files changed, 33 insertions(+), 28 deletions(-)
>
> diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
> index 29c57b2cb344..3eabbbbfd578 100644
> --- a/include/asm-generic/pgtable.h
> +++ b/include/asm-generic/pgtable.h
> @@ -30,9 +30,19 @@ extern int ptep_set_access_flags(struct vm_area_struct *vma,
> #endif
>
> #ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
> +#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> extern int pmdp_set_access_flags(struct vm_area_struct *vma,
> unsigned long address, pmd_t *pmdp,
> pmd_t entry, int dirty);
> +#else
> +static inline int pmdp_set_access_flags(struct vm_area_struct *vma,
> + unsigned long address, pmd_t *pmdp,
> + pmd_t entry, int dirty)
> +{
> + BUILD_BUG();
> + return 0;
> +}
> +#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
> #endif
>
> #ifndef __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
> @@ -64,12 +74,12 @@ static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma,
> set_pmd_at(vma->vm_mm, address, pmdp, pmd_mkold(pmd));
> return r;
> }
> -#else /* CONFIG_TRANSPARENT_HUGEPAGE */
> +#else
> static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma,
> unsigned long address,
> pmd_t *pmdp)
> {
> - BUG();
> + BUILD_BUG();
> return 0;
> }
> #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
> @@ -81,8 +91,21 @@ int ptep_clear_flush_young(struct vm_area_struct *vma,
> #endif
>
> #ifndef __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
> -int pmdp_clear_flush_young(struct vm_area_struct *vma,
> - unsigned long address, pmd_t *pmdp);
> +#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> +extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
> + unsigned long address, pmd_t *pmdp);
> +#else
> +/*
> + * Despite relevant to THP only, this API is called from generic rmap code
> + * under PageTransHuge(), hence needs a dummy implementation for !THP
> + */
> +static inline int pmdp_clear_flush_young(struct vm_area_struct *vma,
> + unsigned long address, pmd_t *pmdp)
> +{
> + BUILD_BUG();
> + return 0;
> +}
> +#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
> #endif
>
> #ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR
> @@ -175,11 +198,11 @@ static inline void pmdp_set_wrprotect(struct mm_struct *mm,
> pmd_t old_pmd = *pmdp;
> set_pmd_at(mm, address, pmdp, pmd_wrprotect(old_pmd));
> }
> -#else /* CONFIG_TRANSPARENT_HUGEPAGE */
> +#else
> static inline void pmdp_set_wrprotect(struct mm_struct *mm,
> unsigned long address, pmd_t *pmdp)
> {
> - BUG();
> + BUILD_BUG();
> }
> #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
> #endif
> @@ -248,7 +271,7 @@ static inline int pmd_same(pmd_t pmd_a, pmd_t pmd_b)
> #else /* CONFIG_TRANSPARENT_HUGEPAGE */
> static inline int pmd_same(pmd_t pmd_a, pmd_t pmd_b)
> {
> - BUG();
> + BUILD_BUG();
> return 0;
> }
> #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
> diff --git a/mm/pgtable-generic.c b/mm/pgtable-generic.c
> index 48851894e699..c9c59bb75a17 100644
> --- a/mm/pgtable-generic.c
> +++ b/mm/pgtable-generic.c
> @@ -82,12 +82,13 @@ pte_t ptep_clear_flush(struct vm_area_struct *vma, unsigned long address,
> }
> #endif
>
> +#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> +
> #ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
> int pmdp_set_access_flags(struct vm_area_struct *vma,
> unsigned long address, pmd_t *pmdp,
> pmd_t entry, int dirty)
> {
> -#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> int changed = !pmd_same(*pmdp, entry);
> VM_BUG_ON(address & ~HPAGE_PMD_MASK);
> if (changed) {
> @@ -95,10 +96,6 @@ int pmdp_set_access_flags(struct vm_area_struct *vma,
> flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
> }
> return changed;
> -#else /* CONFIG_TRANSPARENT_HUGEPAGE */
> - BUG();
> - return 0;
> -#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
> }
> #endif
>
> @@ -107,11 +104,7 @@ int pmdp_clear_flush_young(struct vm_area_struct *vma,
> unsigned long address, pmd_t *pmdp)
> {
> int young;
> -#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> VM_BUG_ON(address & ~HPAGE_PMD_MASK);
> -#else
> - BUG();
> -#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
> young = pmdp_test_and_clear_young(vma, address, pmdp);
> if (young)
> flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
> @@ -120,7 +113,6 @@ int pmdp_clear_flush_young(struct vm_area_struct *vma,
> #endif
>
> #ifndef __HAVE_ARCH_PMDP_HUGE_CLEAR_FLUSH
> -#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma, unsigned long address,
> pmd_t *pmdp)
> {
> @@ -131,11 +123,9 @@ pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma, unsigned long address,
> flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
> return pmd;
> }
> -#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
> #endif
>
> #ifndef __HAVE_ARCH_PMDP_SPLITTING_FLUSH
> -#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address,
> pmd_t *pmdp)
> {
> @@ -145,11 +135,9 @@ void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address,
> /* tlb flush only to serialize against gup-fast */
> flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
> }
> -#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
> #endif
>
> #ifndef __HAVE_ARCH_PGTABLE_DEPOSIT
> -#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
> pgtable_t pgtable)
> {
> @@ -162,11 +150,9 @@ void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
> list_add(&pgtable->lru, &pmd_huge_pte(mm, pmdp)->lru);
> pmd_huge_pte(mm, pmdp) = pgtable;
> }
> -#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
> #endif
>
> #ifndef __HAVE_ARCH_PGTABLE_WITHDRAW
> -#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> /* no "address" argument so destroys page coloring of some arch */
> pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
> {
> @@ -185,11 +171,9 @@ pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
> }
> return pgtable;
> }
> -#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
> #endif
>
> #ifndef __HAVE_ARCH_PMDP_INVALIDATE
> -#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
> pmd_t *pmdp)
> {
> @@ -197,11 +181,9 @@ void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
> set_pmd_at(vma->vm_mm, address, pmdp, pmd_mknotpresent(entry));
> flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
> }
> -#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
> #endif
>
> #ifndef pmdp_collapse_flush
> -#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> pmd_t pmdp_collapse_flush(struct vm_area_struct *vma, unsigned long address,
> pmd_t *pmdp)
> {
> @@ -217,5 +199,5 @@ pmd_t pmdp_collapse_flush(struct vm_area_struct *vma, unsigned long address,
> flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
> return pmd;
> }
> -#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
> #endif
> +#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
>
--
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