linux-kernel - [PATCH 1/2] lib/test_vmalloc.c: Use late_initcall() if built-in for init ordering

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Message-Id: <20250623184035.581229-1-urezki@gmail.com>
Date: Mon, 23 Jun 2025 20:40:34 +0200
From: "Uladzislau Rezki (Sony)" <urezki@...il.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>,
	Baoquan He <bhe@...hat.com>,
	Uladzislau Rezki <urezki@...il.com>,
	Harry Yoo <harry.yoo@...cle.com>,
	Suren Baghdasaryan <surenb@...gle.com>,
	David Wang <00107082@....com>
Subject: [PATCH 1/2] lib/test_vmalloc.c: Use late_initcall() if built-in for init ordering

When the vmalloc test code is compiled as a built-in, use late_initcall()
instead of module_init() to defer a vmalloc test execution until most
subsystems are up and running.

It avoids interfering with components that may not yet be initialized
at module_init() time. For example, there was a recent report of memory
profiling infrastructure not being ready early enough leading to kernel
crash.

By using late_initcall() in the built-in case, we ensure the tests are
run at a safer point during a boot sequence.

Cc: Harry Yoo <harry.yoo@...cle.com>
Cc: Suren Baghdasaryan <surenb@...gle.com>
Cc: David Wang <00107082@....com>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
---
 lib/test_vmalloc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/test_vmalloc.c b/lib/test_vmalloc.c
index 1b0b59549aaf1..7264781750c96 100644
--- a/lib/test_vmalloc.c
+++ b/lib/test_vmalloc.c
@@ -598,7 +598,11 @@ static int __init vmalloc_test_init(void)
 	return IS_BUILTIN(CONFIG_TEST_VMALLOC) ? 0:-EAGAIN;
 }
 
+#ifdef MODULE
 module_init(vmalloc_test_init)
+#else
+late_initcall(vmalloc_test_init);
+#endif
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Uladzislau Rezki");
-- 
2.39.5