linux-kernel - [PATCH v2] mm/sparse: use MEMBLOCK_ALLOC

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Date: Tue, 11 Jun 2024 00:15:28 +0900
From: Leesoo Ahn <lsahn@...eel.net>
To: lsahn@...eel.net
Cc: rppt@...nel.org,
	Leesoo Ahn <lsahn@...akecorp.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2] mm/sparse: use MEMBLOCK_ALLOC_ACCESSIBLE enum instead of 0

Setting 'limit' variable to 0 might seem like it means "no limit". But
in the memblock API, 0 actually means the 'MEMBLOCK_ALLOC_ACCESSIBLE'
enum, which limits the physical address range end based on
'memblock.current_limit'. This could be confusing.

Use the enum instead of 0 to make it clear.

Signed-off-by: Leesoo Ahn <lsahn@...eel.net>
---
v1 -> v2: do not rename 'limit' to 'limit_or_flag'
---
 mm/sparse.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/sparse.c b/mm/sparse.c
index de40b2c73406..cf93abc542ca 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -351,7 +351,7 @@ sparse_early_usemaps_alloc_pgdat_section(struct pglist_data *pgdat,
 again:
 	usage = memblock_alloc_try_nid(size, SMP_CACHE_BYTES, goal, limit, nid);
 	if (!usage && limit) {
-		limit = 0;
+		limit = MEMBLOCK_ALLOC_ACCESSIBLE;
 		goto again;
 	}
 	return usage;
-- 
2.34.1