linux-kernel - [PATCH 3/3] mm/vma: Make is_vma_temporary

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Date:   Wed, 26 Feb 2020 10:20:58 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     linux-mm@...ck.org
Cc:     Anshuman Khandual <anshuman.khandual@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] mm/vma: Make is_vma_temporary_stack() available for general use

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. This should not cause any functional change.

Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
 include/linux/huge_mm.h |  2 --
 include/linux/mm.h      | 14 ++++++++++++++
 mm/rmap.c               | 14 --------------
 3 files changed, 14 insertions(+), 16 deletions(-)

diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 5aca3d1bdb32..87f46b11efe8 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;
 
 /*
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 2fd4b9bec4be..3bbd9c06171b 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -543,6 +543,20 @@ static inline bool vma_is_anonymous(struct vm_area_struct *vma)
 	return !vma->vm_ops;
 }
 
+static inline 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 inline bool vma_is_foreign(struct vm_area_struct *vma)
 {
 	if (!current->mm)
diff --git a/mm/rmap.c b/mm/rmap.c
index b3e381919835..3d9d5e372710 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1696,20 +1696,6 @@ 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);
-- 
2.20.1