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

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Message-ID: <aFpiK2iPRDj8AIzV@MiWiFi-R3L-srv>
Date: Tue, 24 Jun 2025 16:30:35 +0800
From: Baoquan He <bhe@...hat.com>
To: "Uladzislau Rezki (Sony)" <urezki@...il.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>,
	Harry Yoo <harry.yoo@...cle.com>,
	Suren Baghdasaryan <surenb@...gle.com>,
	David Wang <00107082@....com>
Subject: Re: [PATCH 1/2] lib/test_vmalloc.c: Use late_initcall() if built-in
 for init ordering

On 06/23/25 at 08:40pm, Uladzislau Rezki (Sony) wrote:
> 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(+)

LGTM,

Reviewed-by: Baoquan He <bhe@...hat.com>

> 
> 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
> 
>