Re: [PATCH 9/9] testmmiotrace: eliminate anonymous module_init & module_exit

[Steven Rostedt]

On Wed, 16 Mar 2022 12:20:10 -0700
Randy Dunlap <rdunlap@xxxxxxxxxxxxx> wrote:

> Eliminate anonymous module_init() and module_exit(), which can lead to
> confusion or ambiguity when reading System.map, crashes/oops/bugs,
> or an initcall_debug log.
> 
> Give each of these init and exit functions unique driver-specific
> names to eliminate the anonymous names.
> 
> Example 1: (System.map)
>  ffffffff832fc78c t init
>  ffffffff832fc79e t init
>  ffffffff832fc8f8 t init
> 
> Example 2: (initcall_debug log)
>  calling  init+0x0/0x12 @ 1
>  initcall init+0x0/0x12 returned 0 after 15 usecs
>  calling  init+0x0/0x60 @ 1
>  initcall init+0x0/0x60 returned 0 after 2 usecs
>  calling  init+0x0/0x9a @ 1
>  initcall init+0x0/0x9a returned 0 after 74 usecs
> 
> Fixes: 8b7d89d02ef3 ("x86: mmiotrace - trace memory mapped IO")
> Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>

Acked-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>

-- Steve

> Cc: Ingo Molnar <mingo@xxxxxxxxxx>
> Cc: Karol Herbst <karolherbst@xxxxxxxxx>
> Cc: Pekka Paalanen <ppaalanen@xxxxxxxxx>
> Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
> Cc: Andy Lutomirski <luto@xxxxxxxxxx>
> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
> Cc: Borislav Petkov <bp@xxxxxxxxx>
> Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
> Cc: nouveau@xxxxxxxxxxxxxxxxxxxxx
> Cc: x86@xxxxxxxxxx
> ---
>  arch/x86/mm/testmmiotrace.c |    8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> --- lnx-517-rc8.orig/arch/x86/mm/testmmiotrace.c
> +++ lnx-517-rc8/arch/x86/mm/testmmiotrace.c
> @@ -113,7 +113,7 @@ static void do_test_bulk_ioremapping(voi
>  	synchronize_rcu();
>  }
>  
> -static int __init init(void)
> +static int __init testmmiotrace_init(void)
>  {
>  	unsigned long size = (read_far) ? (8 << 20) : (16 << 10);
>  	int ret = security_locked_down(LOCKDOWN_MMIOTRACE);
> @@ -136,11 +136,11 @@ static int __init init(void)
>  	return 0;
>  }
>  
> -static void __exit cleanup(void)
> +static void __exit testmmiotrace_cleanup(void)
>  {
>  	pr_debug("unloaded.\n");
>  }
>  
> -module_init(init);
> -module_exit(cleanup);
> +module_init(testmmiotrace_init);
> +module_exit(testmmiotrace_cleanup);
>  MODULE_LICENSE("GPL");