linux-kernel - [PATCH 1/3] vmalloc: Add for_each_vmap

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Message-Id: <20250408151549.77937-1-urezki@gmail.com>
Date: Tue,  8 Apr 2025 17:15:47 +0200
From: "Uladzislau Rezki (Sony)" <urezki@...il.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@...radead.org>,
	Uladzislau Rezki <urezki@...il.com>,
	Oleksiy Avramchenko <oleksiy.avramchenko@...y.com>
Subject: [PATCH 1/3] vmalloc: Add for_each_vmap_node() helper

To simplify iteration over vmap-nodes, add the for_each_vmap_node()
macro that iterates over all nodes in a system. It tends to simplify
the code.

Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
---
 mm/vmalloc.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index bcc90d4357e48..e42ea20713dc7 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -900,6 +900,11 @@ static struct vmap_node *vmap_nodes = &single;
 static __read_mostly unsigned int nr_vmap_nodes = 1;
 static __read_mostly unsigned int vmap_zone_size = 1;
 
+/* A simple iterator over all vmap-nodes. */
+#define for_each_vmap_node(vn)	\
+	for ((vn) = &vmap_nodes[0];	\
+		(vn) < &vmap_nodes[nr_vmap_nodes]; (vn)++)
+
 static inline unsigned int
 addr_to_node_id(unsigned long addr)
 {
-- 
2.39.5