netdev - Re: [PATCH 9/9] testmmiotrace: eliminate anonymous module_init & module

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Date:   Wed, 16 Mar 2022 22:38:55 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     linux-kernel@...r.kernel.org,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        Jens Axboe <axboe@...nel.dk>, Amit Shah <amit@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Eli Cohen <eli@...lanox.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        Leon Romanovsky <leon@...nel.org>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Krzysztof Opasiak <k.opasiak@...sung.com>,
        Igor Kotrasinski <i.kotrasinsk@...sung.com>,
        Valentina Manea <valentina.manea.m@...il.com>,
        Shuah Khan <shuah@...nel.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Jussi Kivilinna <jussi.kivilinna@...et.fi>,
        Joachim Fritschi <jfritschi@...enet.de>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        Karol Herbst <karolherbst@...il.com>,
        Pekka Paalanen <ppaalanen@...il.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, netfilter-devel@...r.kernel.org,
        coreteam@...filter.org, netdev@...r.kernel.org,
        linux-block@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-scsi@...r.kernel.org,
        linux-usb@...r.kernel.org, nouveau@...ts.freedesktop.org,
        virtualization@...ts.linux-foundation.org, x86@...nel.org
Subject: Re: [PATCH 9/9] testmmiotrace: eliminate anonymous module_init &
 module_exit

On Wed, 16 Mar 2022 12:20:10 -0700
Randy Dunlap <rdunlap@...radead.org> 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@...radead.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Steven Rostedt <rostedt@...dmis.org>

Acked-by: Steven Rostedt (Google) <rostedt@...dmis.org>

-- Steve

> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Karol Herbst <karolherbst@...il.com>
> Cc: Pekka Paalanen <ppaalanen@...il.com>
> Cc: Dave Hansen <dave.hansen@...ux.intel.com>
> Cc: Andy Lutomirski <luto@...nel.org>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Borislav Petkov <bp@...en8.de>
> Cc: "H. Peter Anvin" <hpa@...or.com>
> Cc: nouveau@...ts.freedesktop.org
> Cc: x86@...nel.org
> ---
>  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");