From: Wei Yang <richard.weiyang@linux.alibaba.com>
To: akpm@linux-foundation.org, kirill.shutemov@linux.intel.com,
vbabka@suse.cz, yang.shi@linux.alibaba.com,
thomas_os@shipmail.org, anshuman.khandual@arm.com,
sean.j.christopherson@intel.com,
richard.weiyang@linux.alibaba.com, peterx@redhat.com,
aneesh.kumar@linux.ibm.com, willy@infradead.org,
thellstrom@vmware.com
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, digetx@gmail.com
Subject: [Patch v5 3/3] mm/mremap: start addresses are properly aligned
Date: Fri, 10 Jul 2020 17:28:35 +0800 [thread overview]
Message-ID: <20200710092835.56368-4-richard.weiyang@linux.alibaba.com> (raw)
In-Reply-To: <20200710092835.56368-1-richard.weiyang@linux.alibaba.com>
After previous cleanup, extent is the minimal step for both source and
destination. This means when extent is HPAGE_PMD_SIZE or PMD_SIZE,
old_addr and new_addr are properly aligned too.
Since these two functions are only invoked in move_page_tables, it is
safe to remove the check now.
Signed-off-by: Wei Yang <richard.weiyang@linux.alibaba.com>
Tested-by: Dmitry Osipenko <digetx@gmail.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
mm/huge_memory.c | 3 ---
mm/mremap.c | 3 ---
2 files changed, 6 deletions(-)
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 1e580fdad4d0..462a7dbd6350 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1729,9 +1729,6 @@ bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr,
struct mm_struct *mm = vma->vm_mm;
bool force_flush = false;
- if ((old_addr & ~HPAGE_PMD_MASK) || (new_addr & ~HPAGE_PMD_MASK))
- return false;
-
/*
* The destination pmd shouldn't be established, free_pgtables()
* should have release it.
diff --git a/mm/mremap.c b/mm/mremap.c
index a30b3e86cc99..f5f17d050617 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -199,9 +199,6 @@ static bool move_normal_pmd(struct vm_area_struct *vma, unsigned long old_addr,
struct mm_struct *mm = vma->vm_mm;
pmd_t pmd;
- if ((old_addr & ~PMD_MASK) || (new_addr & ~PMD_MASK))
- return false;
-
/*
* The destination pmd shouldn't be established, free_pgtables()
* should have release it.
--
2.20.1 (Apple Git-117)
prev parent reply other threads:[~2020-07-10 9:29 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-10 9:28 [Patch v5 0/3] mm/mremap: cleanup move_page_tables() a little Wei Yang
2020-07-10 9:28 ` [Patch v5 1/3] mm/mremap: it is sure to have enough space when extent meets requirement Wei Yang
2020-07-10 9:28 ` [Patch v5 2/3] mm/mremap: calculate extent in one place Wei Yang
2020-07-10 9:28 ` Wei Yang [this message]
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