[PATCH v4 20/36] mm/page_ext: enable early_page_ext when CONFIG_MEM_ALLOC_PROFILING_DEBUG=y

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For all page allocations to be tagged, page_ext has to be initialized
before the first page allocation. Early tasks allocate their stacks
using page allocator before alloc_node_page_ext() initializes page_ext
area, unless early_page_ext is enabled. Therefore these allocations will
generate a warning when CONFIG_MEM_ALLOC_PROFILING_DEBUG is enabled.
Enable early_page_ext whenever CONFIG_MEM_ALLOC_PROFILING_DEBUG=y to
ensure page_ext initialization prior to any page allocation. This will
have all the negative effects associated with early_page_ext, such as
possible longer boot time, therefore we enable it only when debugging
with CONFIG_MEM_ALLOC_PROFILING_DEBUG enabled and not universally for

Signed-off-by: Suren Baghdasaryan <surenb@xxxxxxxxxx>
 mm/page_ext.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/mm/page_ext.c b/mm/page_ext.c
index 3c58fe8a24df..e7d8f1a5589e 100644
--- a/mm/page_ext.c
+++ b/mm/page_ext.c
@@ -95,7 +95,16 @@ unsigned long page_ext_size;
 static unsigned long total_usage;
+ * To ensure correct allocation tagging for pages, page_ext should be available
+ * before the first page allocation. Otherwise early task stacks will be
+ * allocated before page_ext initialization and missing tags will be flagged.
+ */
+bool early_page_ext __meminitdata = true;
 bool early_page_ext __meminitdata;
 static int __init setup_early_page_ext(char *str)
 	early_page_ext = true;

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