Re: [PATCH 1/9] virtio_blk: eliminate anonymous module_init & module_exit

From: Jason Wang <jasowang@redhat.com>
To: Randy Dunlap <rdunlap@infradead.org>
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
	"Michael S. Tsirkin" <mst@redhat.com>,
	"Paolo Bonzini" <pbonzini@redhat.com>,
	"Stefan Hajnoczi" <stefanha@redhat.com>,
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Subject: Re: [PATCH 1/9] virtio_blk: eliminate anonymous module_init & module_exit
Date: Thu, 17 Mar 2022 11:26:24 +0800	[thread overview]
Message-ID: <CACGkMEtg6uCNfP-ncXEEWn+EeGLe1-KxbYu45g1-7vR_JHr7hg@mail.gmail.com> (raw)
In-Reply-To: <20220316192010.19001-2-rdunlap@infradead.org>

On Thu, Mar 17, 2022 at 3:25 AM Randy Dunlap <rdunlap@infradead.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@infradead.org>
> Cc: "Michael S. Tsirkin" <mst@redhat.com>
> Cc: Jason Wang <jasowang@redhat.com>
> Cc: Paolo Bonzini <pbonzini@redhat.com>
> Cc: Stefan Hajnoczi <stefanha@redhat.com>
> Cc: virtualization@lists.linux-foundation.org
> Cc: Jens Axboe <axboe@kernel.dk>
> Cc: linux-block@vger.kernel.org
> ---

Acked-by: Jason Wang <jasowang@redhat.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");
>