linux-kernel - [PATCH 4/5] mm/vmalloc: Extend __find_vmap

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Date:   Tue,  7 Jun 2022 11:34:48 +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>,
        Matthew Wilcox <willy@...radead.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Uladzislau Rezki <urezki@...il.com>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...y.com>
Subject: [PATCH 4/5] mm/vmalloc: Extend __find_vmap_area() with one more argument

__find_vmap_area() finds a "vmap_area" based on passed address.
It scan the specific "vmap_area_root" rb-tree. Extend the function
with one extra argument, so any tree can be specified where the
search has to be done.

There is no functional change as a result of this patch.

Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
---
 mm/vmalloc.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 82771e555273..b60385101897 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -814,9 +814,9 @@ static struct vmap_area *find_vmap_area_exceed_addr(unsigned long addr)
 	return va;
 }
 
-static struct vmap_area *__find_vmap_area(unsigned long addr)
+static struct vmap_area *__find_vmap_area(unsigned long addr, struct rb_root *root)
 {
-	struct rb_node *n = vmap_area_root.rb_node;
+	struct rb_node *n = root->rb_node;
 
 	addr = (unsigned long)kasan_reset_tag((void *)addr);
 
@@ -1840,7 +1840,7 @@ static struct vmap_area *find_vmap_area(unsigned long addr)
 	struct vmap_area *va;
 
 	spin_lock(&vmap_area_lock);
-	va = __find_vmap_area(addr);
+	va = __find_vmap_area(addr, &vmap_area_root);
 	spin_unlock(&vmap_area_lock);
 
 	return va;
@@ -2582,7 +2582,7 @@ struct vm_struct *remove_vm_area(const void *addr)
 	might_sleep();
 
 	spin_lock(&vmap_area_lock);
-	va = __find_vmap_area((unsigned long)addr);
+	va = __find_vmap_area((unsigned long)addr, &vmap_area_root);
 	if (va && va->vm) {
 		struct vm_struct *vm = va->vm;
 
-- 
2.30.2