linux-kernel - [PATCH 2/3] mm: clear_soft_dirty

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Date:	Fri, 16 Oct 2015 14:07:07 +0200
From:	Laurent Dufour <ldufour@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	akpm@...ux-foundation.org, xemul@...allels.com,
	linuxppc-dev@...ts.ozlabs.org, mpe@...erman.id.au,
	benh@...nel.crashing.org, aneesh.kumar@...ux.vnet.ibm.com,
	paulus@...ba.org
Cc:	criu@...nvz.org
Subject: [PATCH 2/3] mm: clear_soft_dirty_pmd requires THP

Don't build clear_soft_dirty_pmd() if the transparent huge pages are
not enabled.

Signed-off-by: Laurent Dufour <ldufour@...ux.vnet.ibm.com>
CC: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
---
 fs/proc/task_mmu.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index c9454ee39b28..fa847a982a9f 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -762,7 +762,14 @@ static inline void clear_soft_dirty(struct vm_area_struct *vma,
 		set_pte_at(vma->vm_mm, addr, pte, ptent);
 	}
 }
+#else
+static inline void clear_soft_dirty(struct vm_area_struct *vma,
+		unsigned long addr, pte_t *pte)
+{
+}
+#endif
 
+#if defined(CONFIG_MEM_SOFT_DIRTY) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
 static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma,
 		unsigned long addr, pmd_t *pmdp)
 {
@@ -776,14 +783,7 @@ static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma,
 
 	set_pmd_at(vma->vm_mm, addr, pmdp, pmd);
 }
-
 #else
-
-static inline void clear_soft_dirty(struct vm_area_struct *vma,
-		unsigned long addr, pte_t *pte)
-{
-}
-
 static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma,
 		unsigned long addr, pmd_t *pmdp)
 {
-- 
1.9.1

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