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-rw-r--r--mm/memblock.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/mm/memblock.c b/mm/memblock.c
index 6a2a48a..de4d9c3 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -269,6 +269,19 @@ phys_addr_t __init_memblock get_allocated_memblock_reserved_regions_info(
if (memblock.reserved.regions == memblock_reserved_init_regions)
return 0;
+ /*
+ * Don't allow nobootmem allocator to free reserved memory regions
+ * array if
+ * - CONFIG_DEBUG_FS is enabled;
+ * - CONFIG_ARCH_DISCARD_MEMBLOCK is not enabled;
+ * - reserved memory regions array have been resized during boot.
+ * Otherwise debug_fs entry "sys/kernel/debug/memblock/reserved"
+ * will show garbage instead of state of memory reservations.
+ */
+ if (IS_ENABLED(CONFIG_DEBUG_FS) &&
+ !IS_ENABLED(CONFIG_ARCH_DISCARD_MEMBLOCK))
+ return 0;
+
*addr = __pa(memblock.reserved.regions);
return PAGE_ALIGN(sizeof(struct memblock_region) *
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