linux-kernel - [PATCH 2/5] mm/sparse: free section usage memory in case populate_section

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Date:   Mon, 17 May 2021 19:20:41 +0800
From:   Dong Aisheng <aisheng.dong@....com>
To:     linux-mm@...ck.org
Cc:     linux-kernel@...r.kernel.org, dongas86@...il.com,
        Dong Aisheng <aisheng.dong@....com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH 2/5] mm/sparse: free section usage memory in case populate_section_memmap failed

Free section usage memory in case populate_section_memmap failed.
We use map_count to track the remain unused memory to be freed.

Cc: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Dong Aisheng <aisheng.dong@....com>
---
 mm/sparse.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/sparse.c b/mm/sparse.c
index 7ac481353b6b..98bfacc763da 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -549,12 +549,14 @@ static void __init sparse_init_nid(int nid, unsigned long pnum_begin,
 			       __func__, nid);
 			pnum_begin = pnum;
 			sparse_buffer_fini();
+			memblock_free_early(__pa(usage), map_count * mem_section_usage_size());
 			goto failed;
 		}
 		check_usemap_section_nr(nid, usage);
 		sparse_init_one_section(__nr_to_section(pnum), pnum, map, usage,
 				SECTION_IS_EARLY);
 		usage = (void *) usage + mem_section_usage_size();
+		map_count--;
 	}
 	sparse_buffer_fini();
 	return;
-- 
2.25.1