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From 093316a897a2eb4972a7a3a5888f40975d03f6bf Mon Sep 17 00:00:00 2001
From: Brice Goglin <Brice.Goglin@inria.fr>
Date: Tue, 5 Apr 2022 17:39:50 +0200
Subject: [PATCH] linux: (partial) fix the discovery of hugepages on btrfs
fsroot
btrfs always returns 1 in directory stat.st_nlink.
It breaks make check in tests/linux/ because the hugepages discovery
uses st_nlink to allocate the memory page_types array.
Always allocate at least 3 page_types slots
(enough for all known cases, 1 for normal, 2 for huge pages)
(partially cherry-picked from commit 7f351cec9bfe54a031f35ad16c9cfb99784d76dc)
We don't reallocate later if needed as in 2.x commit 7f351cec9bfe54a031f35ad16c9cfb99784d76dc
because v1.11 doesn't deserve a complete fix. Just commit the minimal change
so that tests/linux/2i386-2t-hugepagesizecount with HWLOC_PAGESIZE_DEBUG=4096
doesn't crash in btrfs anymore (test-topology.sh fails during make check if /tmp is in btrfs).
Thanks to Philippe Swartvagher for the report.
Signed-off-by: Brice Goglin <Brice.Goglin@inria.fr>
---
src/topology-linux.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/src/topology-linux.c b/src/topology-linux.c
index 58c275fea..269eca7f5 100644
--- a/src/topology-linux.c
+++ b/src/topology-linux.c
@@ -1,6 +1,6 @@
/*
* Copyright © 2009 CNRS
- * Copyright © 2009-2019 Inria. All rights reserved.
+ * Copyright © 2009-2022 Inria. All rights reserved.
* Copyright © 2009-2013, 2015 Université Bordeaux
* Copyright © 2009-2014 Cisco Systems, Inc. All rights reserved.
* Copyright © 2015 Intel, Inc. All rights reserved.
@@ -2329,7 +2329,14 @@ hwloc_get_procfs_meminfo_info(struct hwloc_topology *topology,
err = hwloc_stat("/sys/kernel/mm/hugepages", &st, data->root_fd);
if (!err) {
- types = 1 + st.st_nlink-2;
+ types = 1 /* normal non-huge size */ + st.st_nlink - 2 /* ignore . and .. */;
+ if (types < 3)
+ /* some buggy filesystems (e.g. btrfs when reading from fsroot)
+ * return wrong st_nlink for directories (always 1 for btrfs).
+ * use 3 as a sane default (default page + 2 huge sizes).
+ * hwloc_parse_hugepages_info() will extend it if needed.
+ */
+ types = 3;
has_sysfs_hugepages = 1;
}
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