[PATCH 1/1] mm: kfence: skip kmemleak alloc in kfence_pool

[yee.lee]

From: Yee Lee <yee.lee@xxxxxxxxxxxx>

Use MEMBLOCK_ALLOC_NOLEAKTRACE to skip kmemleak registration when
the kfence pool is allocated from memblock. And the kmemleak_free
later can be removed too.

Signed-off-by: Yee Lee <yee.lee@xxxxxxxxxxxx>

---
 mm/kfence/core.c | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/mm/kfence/core.c b/mm/kfence/core.c
index 4e7cd4c8e687..0d33d83f5244 100644
--- a/mm/kfence/core.c
+++ b/mm/kfence/core.c
@@ -600,14 +600,6 @@ static unsigned long kfence_init_pool(void)
 		addr += 2 * PAGE_SIZE;
 	}
 
-	/*
-	 * The pool is live and will never be deallocated from this point on.
-	 * Remove the pool object from the kmemleak object tree, as it would
-	 * otherwise overlap with allocations returned by kfence_alloc(), which
-	 * are registered with kmemleak through the slab post-alloc hook.
-	 */
-	kmemleak_free(__kfence_pool);
-
 	return 0;
 }
 
@@ -831,8 +823,14 @@ void __init kfence_alloc_pool(void)
 {
 	if (!kfence_sample_interval)
 		return;
-
-	__kfence_pool = memblock_alloc(KFENCE_POOL_SIZE, PAGE_SIZE);
+	/*
+	 * The pool is live and will never be deallocated from this point on.
+	 * Skip the pool object from the kmemleak object allocation, as it would
+	 * otherwise overlap with allocations returned by kfence_alloc(), which
+	 * are registered with kmemleak through the slab post-alloc hook.
+	 */
+	__kfence_pool = memblock_alloc_try_nid(KFENCE_POOL_SIZE, PAGE_SIZE,
+		 MEMBLOCK_LOW_LIMIT, MEMBLOCK_ALLOC_NOLEAKTRACE, NUMA_NO_NODE);
 
 	if (!__kfence_pool)
 		pr_err("failed to allocate pool\n");
-- 
2.18.0