Ensure that memory hotplug can co-exist with kmemleak
by taking the hotplug lock before scanning the memory
banks.
Signed-off-by: Laura Abbott <lauraa@xxxxxxxxxxxxxx>
---
lib/Kconfig.debug | 2 +-
mm/kmemleak.c | 6 ++++--
2 files changed, 5 insertions(+), 3 deletions(-)
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index c6b006a..6a9e368 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -413,7 +413,7 @@ config SLUB_STATS
config DEBUG_KMEMLEAK
bool "Kernel memory leak detector"
- depends on DEBUG_KERNEL && EXPERIMENTAL && !MEMORY_HOTPLUG && \
+ depends on DEBUG_KERNEL && EXPERIMENTAL && \
(X86 || ARM || PPC || MIPS || S390 || SPARC64 || SUPERH || MICROBLAZE || TILE)
select DEBUG_FS
diff --git a/mm/kmemleak.c b/mm/kmemleak.c
index aacee45..4facb03 100644
--- a/mm/kmemleak.c
+++ b/mm/kmemleak.c
@@ -100,6 +100,7 @@
#include <linux/kmemcheck.h>
#include <linux/kmemleak.h>
+#include <linux/memory_hotplug.h>
/*
* Kmemleak configuration and common defines.
@@ -1220,9 +1221,9 @@ static void kmemleak_scan(void)
#endif
/*
- * Struct page scanning for each node. The code below is not yet safe
- * with MEMORY_HOTPLUG.
+ * Struct page scanning for each node.
*/
+ lock_memory_hotplug();
for_each_online_node(i) {
pg_data_t *pgdat = NODE_DATA(i);
unsigned long start_pfn = pgdat->node_start_pfn;
@@ -1241,6 +1242,7 @@ static void kmemleak_scan(void)
scan_block(page, page + 1, NULL, 1);
}
}
+ unlock_memory_hotplug();
/*
* Scanning the task stacks (may introduce false negatives).
--
1.7.6
--
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