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Subject[PATCH V2 3/3] mm/vma: Make is_vma_temporary_stack() available for general use
Date
Currently the declaration and definition for is_vma_temporary_stack() are
scattered. Lets make is_vma_temporary_stack() helper available for general
use and also drop the declaration from (include/linux/huge_mm.h) which is
no longer required. While at this, rename this as vma_is_temporary_stack()
in line with existing helpers. This should not cause any functional change.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org
Cc: linux-mm@kvack.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
include/linux/huge_mm.h | 4 +---
include/linux/mm.h | 14 ++++++++++++++
mm/khugepaged.c | 2 +-
mm/mremap.c | 2 +-
mm/rmap.c | 16 +---------------
5 files changed, 18 insertions(+), 20 deletions(-)

diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 5aca3d1bdb32..31c39f4a5518 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -87,8 +87,6 @@ extern struct kobj_attribute shmem_enabled_attr;
#define HPAGE_PUD_SIZE ((1UL) << HPAGE_PUD_SHIFT)
#define HPAGE_PUD_MASK (~(HPAGE_PUD_SIZE - 1))

-extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
-
extern unsigned long transparent_hugepage_flags;

/*
@@ -100,7 +98,7 @@ static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
if (vma->vm_flags & VM_NOHUGEPAGE)
return false;

- if (is_vma_temporary_stack(vma))
+ if (vma_is_temporary_stack(vma))
return false;

if (test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
diff --git a/include/linux/mm.h b/include/linux/mm.h
index c5d2fd889bdf..2b7e201eb12a 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -544,6 +544,20 @@ static inline bool vma_is_anonymous(struct vm_area_struct *vma)
return !vma->vm_ops;
}

+static inline bool vma_is_temporary_stack(struct vm_area_struct *vma)
+{
+ int maybe_stack = vma->vm_flags & (VM_GROWSDOWN | VM_GROWSUP);
+
+ if (!maybe_stack)
+ return false;
+
+ if ((vma->vm_flags & VM_STACK_INCOMPLETE_SETUP) ==
+ VM_STACK_INCOMPLETE_SETUP)
+ return true;
+
+ return false;
+}
+
static inline bool vma_is_foreign(struct vm_area_struct *vma)
{
if (!current->mm)
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 494443628850..c659c68728bc 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -421,7 +421,7 @@ static bool hugepage_vma_check(struct vm_area_struct *vma,
}
if (!vma->anon_vma || vma->vm_ops)
return false;
- if (is_vma_temporary_stack(vma))
+ if (vma_is_temporary_stack(vma))
return false;
return !(vm_flags & VM_NO_KHUGEPAGED);
}
diff --git a/mm/mremap.c b/mm/mremap.c
index af363063ea23..9438c8568f34 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -133,7 +133,7 @@ static void move_ptes(struct vm_area_struct *vma, pmd_t *old_pmd,
* such races:
*
* - During exec() shift_arg_pages(), we use a specially tagged vma
- * which rmap call sites look for using is_vma_temporary_stack().
+ * which rmap call sites look for using vma_is_temporary_stack().
*
* - During mremap(), new_vma is often known to be placed after vma
* in rmap traversal order. This ensures rmap will always observe
diff --git a/mm/rmap.c b/mm/rmap.c
index b3e381919835..b2acbe31b625 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1696,23 +1696,9 @@ static bool try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
return ret;
}

-bool is_vma_temporary_stack(struct vm_area_struct *vma)
-{
- int maybe_stack = vma->vm_flags & (VM_GROWSDOWN | VM_GROWSUP);
-
- if (!maybe_stack)
- return false;
-
- if ((vma->vm_flags & VM_STACK_INCOMPLETE_SETUP) ==
- VM_STACK_INCOMPLETE_SETUP)
- return true;
-
- return false;
-}
-
static bool invalid_migration_vma(struct vm_area_struct *vma, void *arg)
{
- return is_vma_temporary_stack(vma);
+ return vma_is_temporary_stack(vma);
}

static int page_mapcount_is_zero(struct page *page)
--
2.20.1
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