From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f43.google.com (mail-pa0-f43.google.com [209.85.220.43]) by kanga.kvack.org (Postfix) with ESMTP id BB38482F65 for ; Tue, 6 Oct 2015 11:24:42 -0400 (EDT) Received: by pacex6 with SMTP id ex6so213611319pac.0 for ; Tue, 06 Oct 2015 08:24:42 -0700 (PDT) Received: from mga09.intel.com (mga09.intel.com. [134.134.136.24]) by mx.google.com with ESMTP id km1si49651920pab.52.2015.10.06.08.24.24 for ; Tue, 06 Oct 2015 08:24:24 -0700 (PDT) From: "Kirill A. Shutemov" Subject: [PATCHv12 17/37] arm64, thp: remove infrastructure for handling splitting PMDs Date: Tue, 6 Oct 2015 18:23:44 +0300 Message-Id: <1444145044-72349-18-git-send-email-kirill.shutemov@linux.intel.com> In-Reply-To: <1444145044-72349-1-git-send-email-kirill.shutemov@linux.intel.com> References: <1444145044-72349-1-git-send-email-kirill.shutemov@linux.intel.com> Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton , Andrea Arcangeli , Hugh Dickins Cc: Dave Hansen , Mel Gorman , Rik van Riel , Vlastimil Babka , Christoph Lameter , Naoya Horiguchi , Steve Capper , "Aneesh Kumar K.V" , Johannes Weiner , Michal Hocko , Jerome Marchand , Sasha Levin , linux-kernel@vger.kernel.org, linux-mm@kvack.org, "Kirill A. Shutemov" 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 --- 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org