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From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Vlastimil Babka <vbabka@suse.cz>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Michal Hocko <mhocko@kernel.org>,
	linux-arch@vger.kernel.org, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org,
	Catalin Marinas <catalin.marinas@arm.com>,
	"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>
Subject: [PATCHv4 04/12] arm64: Provide pmdp_establish() helper
Date: Wed, 13 Dec 2017 13:57:48 +0300	[thread overview]
Message-ID: <20171213105756.69879-5-kirill.shutemov@linux.intel.com> (raw)
In-Reply-To: <20171213105756.69879-1-kirill.shutemov@linux.intel.com>

From: Catalin Marinas <catalin.marinas@arm.com>

We need an atomic way to setup pmd page table entry, avoiding races with
CPU setting dirty/accessed bits. This is required to implement
pmdp_invalidate() that doesn't lose these bits.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
 arch/arm64/include/asm/pgtable.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 149d05fb9421..116d610a2620 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -676,6 +676,13 @@ static inline void pmdp_set_wrprotect(struct mm_struct *mm,
 {
 	ptep_set_wrprotect(mm, address, (pte_t *)pmdp);
 }
+
+#define pmdp_establish pmdp_establish
+static inline pmd_t pmdp_establish(struct vm_area_struct *vma,
+		unsigned long address, pmd_t *pmdp, pmd_t pmd)
+{
+	return __pmd(xchg_relaxed(&pmd_val(*pmdp), pmd_val(pmd)));
+}
 #endif
 
 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
-- 
2.15.0

WARNING: multiple messages have this Message-ID (diff)
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Vlastimil Babka <vbabka@suse.cz>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Michal Hocko <mhocko@kernel.org>,
	linux-arch@vger.kernel.org, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org,
	Catalin Marinas <catalin.marinas@arm.com>,
	"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>
Subject: [PATCHv4 04/12] arm64: Provide pmdp_establish() helper
Date: Wed, 13 Dec 2017 13:57:48 +0300	[thread overview]
Message-ID: <20171213105756.69879-5-kirill.shutemov@linux.intel.com> (raw)
In-Reply-To: <20171213105756.69879-1-kirill.shutemov@linux.intel.com>

From: Catalin Marinas <catalin.marinas@arm.com>

We need an atomic way to setup pmd page table entry, avoiding races with
CPU setting dirty/accessed bits. This is required to implement
pmdp_invalidate() that doesn't lose these bits.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
 arch/arm64/include/asm/pgtable.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 149d05fb9421..116d610a2620 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -676,6 +676,13 @@ static inline void pmdp_set_wrprotect(struct mm_struct *mm,
 {
 	ptep_set_wrprotect(mm, address, (pte_t *)pmdp);
 }
+
+#define pmdp_establish pmdp_establish
+static inline pmd_t pmdp_establish(struct vm_area_struct *vma,
+		unsigned long address, pmd_t *pmdp, pmd_t pmd)
+{
+	return __pmd(xchg_relaxed(&pmd_val(*pmdp), pmd_val(pmd)));
+}
 #endif
 
 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
-- 
2.15.0

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  parent reply	other threads:[~2017-12-13 10:59 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-12-13 10:57 [PATCHv4 00/12] Do not lose dirty bit on THP pages Kirill A. Shutemov
2017-12-13 10:57 ` Kirill A. Shutemov
2017-12-13 10:57 ` [PATCHv4 01/12] asm-generic: Provide generic_pmdp_establish() Kirill A. Shutemov
2017-12-13 10:57   ` Kirill A. Shutemov
2017-12-13 10:57 ` [PATCHv4 02/12] arc: Use generic_pmdp_establish as pmdp_establish Kirill A. Shutemov
2017-12-13 10:57   ` Kirill A. Shutemov
2017-12-13 10:57 ` [PATCHv4 03/12] arm/mm: Provide pmdp_establish() helper Kirill A. Shutemov
2017-12-13 10:57   ` Kirill A. Shutemov
2017-12-13 10:57 ` Kirill A. Shutemov [this message]
2017-12-13 10:57   ` [PATCHv4 04/12] arm64: " Kirill A. Shutemov
2017-12-13 10:57 ` [PATCHv4 05/12] mips: Use generic_pmdp_establish as pmdp_establish Kirill A. Shutemov
2017-12-13 10:57   ` Kirill A. Shutemov
2017-12-13 10:57 ` [PATCHv4 06/12] powerpc/mm: update pmdp_invalidate to return old pmd value Kirill A. Shutemov
2017-12-13 10:57   ` Kirill A. Shutemov
2017-12-13 10:57 ` [PATCHv4 07/12] s390/mm: Modify pmdp_invalidate to return old value Kirill A. Shutemov
2017-12-13 10:57   ` Kirill A. Shutemov
2017-12-13 10:57 ` [PATCHv4 08/12] sparc64: Update pmdp_invalidate() to return old pmd value Kirill A. Shutemov
2017-12-13 10:57   ` Kirill A. Shutemov
2017-12-14  0:06   ` Andrew Morton
2017-12-14  0:06     ` Andrew Morton
2017-12-14  0:06     ` Andrew Morton
2017-12-13 10:57 ` [PATCHv4 09/12] x86/mm: Provide pmdp_establish() helper Kirill A. Shutemov
2017-12-13 10:57   ` Kirill A. Shutemov
2017-12-14  0:09   ` Andrew Morton
2017-12-14  0:09     ` Andrew Morton
2017-12-14  0:33     ` Kirill A. Shutemov
2017-12-14  0:33       ` Kirill A. Shutemov
2017-12-14  0:36       ` Andrew Morton
2017-12-14  0:36         ` Andrew Morton
2017-12-14  0:42         ` Kirill A. Shutemov
2017-12-14  0:42           ` Kirill A. Shutemov
2017-12-15 13:49         ` Kirill A. Shutemov
2017-12-15 13:49           ` Kirill A. Shutemov
2017-12-13 10:57 ` [PATCHv4 10/12] mm: Do not lose dirty and access bits in pmdp_invalidate() Kirill A. Shutemov
2017-12-13 10:57   ` Kirill A. Shutemov
2017-12-13 10:57 ` [PATCHv4 11/12] mm: Use updated pmdp_invalidate() interface to track dirty/accessed bits Kirill A. Shutemov
2017-12-13 10:57   ` Kirill A. Shutemov
2017-12-13 10:57 ` [PATCHv4 12/12] mm/thp: Remove pmd_huge_split_prepare Kirill A. Shutemov
2017-12-13 10:57   ` Kirill A. Shutemov

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