linux-kernel - Re: [PATCH 1/9] virtio_blk: eliminate anonymous module_init & module

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Message-ID: <CACGkMEtg6uCNfP-ncXEEWn+EeGLe1-KxbYu45g1-7vR_JHr7hg@mail.gmail.com>
Date:   Thu, 17 Mar 2022 11:26:24 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        "Michael S. Tsirkin" <mst@...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>,
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        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>,
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        Peter Zijlstra <peterz@...radead.org>,
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        nouveau@...ts.freedesktop.org,
        virtualization <virtualization@...ts.linux-foundation.org>,
        "the arch/x86 maintainers" <x86@...nel.org>
Subject: Re: [PATCH 1/9] virtio_blk: eliminate anonymous module_init & module_exit

On Thu, Mar 17, 2022 at 3:25 AM 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: e467cde23818 ("Block driver using virtio.")
> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
> Cc: "Michael S. Tsirkin" <mst@...hat.com>
> Cc: Jason Wang <jasowang@...hat.com>
> Cc: Paolo Bonzini <pbonzini@...hat.com>
> Cc: Stefan Hajnoczi <stefanha@...hat.com>
> Cc: virtualization@...ts.linux-foundation.org
> Cc: Jens Axboe <axboe@...nel.dk>
> Cc: linux-block@...r.kernel.org
> ---

Acked-by: Jason Wang <jasowang@...hat.com>

>  drivers/block/virtio_blk.c |    8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
> --- lnx-517-rc8.orig/drivers/block/virtio_blk.c
> +++ lnx-517-rc8/drivers/block/virtio_blk.c
> @@ -1058,7 +1058,7 @@ static struct virtio_driver virtio_blk =
>  #endif
>  };
>
> -static int __init init(void)
> +static int __init virtio_blk_init(void)
>  {
>         int error;
>
> @@ -1084,14 +1084,14 @@ out_destroy_workqueue:
>         return error;
>  }
>
> -static void __exit fini(void)
> +static void __exit virtio_blk_fini(void)
>  {
>         unregister_virtio_driver(&virtio_blk);
>         unregister_blkdev(major, "virtblk");
>         destroy_workqueue(virtblk_wq);
>  }
> -module_init(init);
> -module_exit(fini);
> +module_init(virtio_blk_init);
> +module_exit(virtio_blk_fini);
>
>  MODULE_DEVICE_TABLE(virtio, id_table);
>  MODULE_DESCRIPTION("Virtio block driver");
>