linux-kernel - [PATCH v2 4/4] mm/vmalloc: Add code comment for find_vmap_area_exceed

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Date:   Tue,  7 Jun 2022 18:59:58 +0800
From:   Baoquan He <bhe@...hat.com>
To:     akpm@...ux-foundation.org, urezki@...il.com
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        hch@...radead.org, Baoquan He <bhe@...hat.com>
Subject: [PATCH v2 4/4] mm/vmalloc: Add code comment for find_vmap_area_exceed_addr()

Its behaviour is like find_vma() which finds an area above the specified
address, add comment to make it easier to understand.

And also fix two places of grammer mistake/typo.

Signed-off-by: Baoquan He <bhe@...hat.com>
Reviewed-by: Uladzislau Rezki (Sony) <urezki@...il.com>
---
 mm/vmalloc.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index b9bf7dfe71ec..a4d8b80734fa 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -790,6 +790,7 @@ unsigned long vmalloc_nr_pages(void)
 	return atomic_long_read(&nr_vmalloc_pages);
 }
 
+/* Look up the first VA which satisfies addr < va_end, NULL if none. */
 static struct vmap_area *find_vmap_area_exceed_addr(unsigned long addr)
 {
 	struct vmap_area *va = NULL;
@@ -929,7 +930,7 @@ link_va(struct vmap_area *va, struct rb_root *root,
 		 * Some explanation here. Just perform simple insertion
 		 * to the tree. We do not set va->subtree_max_size to
 		 * its current size before calling rb_insert_augmented().
-		 * It is because of we populate the tree from the bottom
+		 * It is because we populate the tree from the bottom
 		 * to parent levels when the node _is_ in the tree.
 		 *
 		 * Therefore we set subtree_max_size to zero after insertion,
@@ -1655,7 +1656,7 @@ static atomic_long_t vmap_lazy_nr = ATOMIC_LONG_INIT(0);
 
 /*
  * Serialize vmap purging.  There is no actual critical section protected
- * by this look, but we want to avoid concurrent calls for performance
+ * by this lock, but we want to avoid concurrent calls for performance
  * reasons and to make the pcpu_get_vm_areas more deterministic.
  */
 static DEFINE_MUTEX(vmap_purge_lock);
-- 
2.34.1