[PATCH v3] mm: page_alloc: add missing hooks to bulk allocation path

[Qiqi Liu]

The bulk allocation path in alloc_pages_bulk_noprof() currently misses
trace_mm_page_alloc() and kmsan_alloc_page() calls, leaving bulk-allocated
pages invisible to ftrace/BPF/perf and leaving KMSAN shadow memory stale.

Add both calls after set_page_refcounted() in the bulk loop to match
the standard allocation path. The gfp mask passed to kmsan_alloc_page()
is stripped of __GFP_RECLAIM because the bulk loop runs under the PCP
spinlock, and KMSAN's stack depot allocation must not sleep.

Both are no-ops when their respective features are disabled, so there
is no overhead in production kernels.

Suggested-by: Gregory Price <gourry@xxxxxxxxxx>
Signed-off-by: Qiqi Liu <liuqiqi@xxxxxxxxxx>
---
 mm/page_alloc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 12fac9084c48..73c73499a051 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5280,6 +5280,8 @@ unsigned long alloc_pages_bulk_noprof(gfp_t gfp, int preferred_nid,
 
 		prep_new_page(page, 0, gfp, ALLOC_DEFAULT);
 		set_page_refcounted(page);
+		trace_mm_page_alloc(page, 0, gfp, ac.migratetype);
+		kmsan_alloc_page(page, 0, gfp & ~__GFP_RECLAIM);
 		page_array[nr_populated++] = page;
 	}
 
-- 
2.25.1