linux-kernel - [RFC V2 11/37] mm: export mempolicy interfaces to serve dmem allocator

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Message-Id: <f3a54a74d35057cbdc451eb559dd94d5413f3947.1607332046.git.yuleixzhang@tencent.com>
Date:   Mon,  7 Dec 2020 19:31:04 +0800
From:   yulei.kernel@...il.com
To:     linux-mm@...ck.org, akpm@...ux-foundation.org,
        linux-fsdevel@...r.kernel.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, naoya.horiguchi@....com,
        viro@...iv.linux.org.uk, pbonzini@...hat.com
Cc:     joao.m.martins@...cle.com, rdunlap@...radead.org,
        sean.j.christopherson@...el.com, xiaoguangrong.eric@...il.com,
        kernellwp@...il.com, lihaiwei.kernel@...il.com,
        Yulei Zhang <yuleixzhang@...cent.com>
Subject: [RFC V2 11/37] mm: export mempolicy interfaces to serve dmem allocator

From: Yulei Zhang <yuleixzhang@...cent.com>

Export interface interleave_nid() to serve dmem allocator.

Signed-off-by: Yulei Zhang <yuleixzhang@...cent.com>
---
 include/linux/mempolicy.h | 3 +++
 mm/mempolicy.c            | 4 ++--
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/include/linux/mempolicy.h b/include/linux/mempolicy.h
index 5f1c74d..4789661 100644
--- a/include/linux/mempolicy.h
+++ b/include/linux/mempolicy.h
@@ -139,6 +139,9 @@ struct mempolicy *mpol_shared_policy_lookup(struct shared_policy *sp,
 struct mempolicy *get_task_policy(struct task_struct *p);
 struct mempolicy *__get_vma_policy(struct vm_area_struct *vma,
 		unsigned long addr);
+struct mempolicy *get_vma_policy(struct vm_area_struct *vma, unsigned long addr);
+unsigned interleave_nid(struct mempolicy *pol, struct vm_area_struct *vma,
+			unsigned long addr, int shift);
 bool vma_policy_mof(struct vm_area_struct *vma);
 
 extern void numa_default_policy(void);
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 3ca4898..efd80e5 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1813,7 +1813,7 @@ struct mempolicy *__get_vma_policy(struct vm_area_struct *vma,
  * freeing by another task.  It is the caller's responsibility to free the
  * extra reference for shared policies.
  */
-static struct mempolicy *get_vma_policy(struct vm_area_struct *vma,
+struct mempolicy *get_vma_policy(struct vm_area_struct *vma,
 						unsigned long addr)
 {
 	struct mempolicy *pol = __get_vma_policy(vma, addr);
@@ -1978,7 +1978,7 @@ static unsigned offset_il_node(struct mempolicy *pol, unsigned long n)
 }
 
 /* Determine a node number for interleave */
-static inline unsigned interleave_nid(struct mempolicy *pol,
+unsigned interleave_nid(struct mempolicy *pol,
 		 struct vm_area_struct *vma, unsigned long addr, int shift)
 {
 	if (vma) {
-- 
1.8.3.1