linux-kernel - [PATCH] mm/mempolicy: Use readable NUMA_NO

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Message-Id: <1b77c0ce21183fa86f4db250b115cf5e27396528.1627558356.git.baolin.wang@linux.alibaba.com>
Date:   Thu, 29 Jul 2021 19:35:43 +0800
From:   Baolin Wang <baolin.wang@...ux.alibaba.com>
To:     akpm@...ux-foundation.org
Cc:     baolin.wang@...ux.alibaba.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] mm/mempolicy: Use readable NUMA_NO_NODE macro instead of magic numer

The caller of mpol_misplaced() already use NUMA_NO_NODE to check
whether current page node is misplaced, thus using NUMA_NO_NODE
in mpol_misplaced() instead of magic number is more readable.

Signed-off-by: Baolin Wang <baolin.wang@...ux.alibaba.com>
---
 mm/mempolicy.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index cedc816..038510d 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -2470,8 +2470,8 @@ static void sp_free(struct sp_node *n)
  * node id.  Policy determination "mimics" alloc_page_vma().
  * Called from fault path where we know the vma and faulting address.
  *
- * Return: -1 if the page is in a node that is valid for this policy, or a
- * suitable node ID to allocate a replacement page from.
+ * Return: NUMA_NO_NODE if the page is in a node that is valid for this
+ * policy, or a suitable node ID to allocate a replacement page from.
  */
 int mpol_misplaced(struct page *page, struct vm_area_struct *vma, unsigned long addr)
 {
@@ -2482,7 +2482,7 @@ int mpol_misplaced(struct page *page, struct vm_area_struct *vma, unsigned long
 	int thiscpu = raw_smp_processor_id();
 	int thisnid = cpu_to_node(thiscpu);
 	int polnid = NUMA_NO_NODE;
-	int ret = -1;
+	int ret = NUMA_NO_NODE;
 
 	pol = get_vma_policy(vma, addr);
 	if (!(pol->flags & MPOL_F_MOF))
-- 
1.8.3.1