linux-kernel - RE: __unsafe() usage

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Date:	Mon, 23 Jul 2007 16:40:10 -0700
From:	"Nelson, Shannon" <shannon.nelson@...el.com>
To:	"Rusty Russell" <rusty@...tcorp.com.au>,
	"Adrian Bunk" <bunk@...sta.de>
Cc:	"Gabriel C" <nix.or.die@...glemail.com>,
	"lkml" <linux-kernel@...r.kernel.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	<lksctp-developers@...ts.sourceforge.net>,
	"Williams, Dan J" <dan.j.williams@...el.com>
Subject: RE: __unsafe() usage

Rusty Russell [mailto:rusty@...tcorp.com.au] 
>> If this is true, and since the MOD_INC_USE_COUNT compat code is long 
>> gone, shouldn't we be able to completely remove __unsafe() and the 
>> struct member "unsafe"?
>
>Yes, indeed, something like this:
>==
>Remove "unsafe" from module struct
>
>Adrian Bunk points out that "unsafe" was used to mark modules 
>touched by
>the deprecated MOD_INC_USE_COUNT interface, which has long gone.  It's
>time to remove the member from the module structure, as well.
>
>If you want a module which can't unload, don't register an exit
>function.
>
>Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
>
>diff -r d7af727512fd drivers/dma/ioatdma.c
>--- a/drivers/dma/ioatdma.c	Tue Jul 24 08:30:05 2007 +1000
>+++ b/drivers/dma/ioatdma.c	Tue Jul 24 09:11:11 2007 +1000
>@@ -811,18 +811,17 @@ MODULE_AUTHOR("Intel Corporation");
> 
> static int __init ioat_init_module(void)
> {
>-	/* it's currently unsafe to unload this module */
>-	/* if forced, worst case is that rmmod hangs */
>-	__unsafe(THIS_MODULE);
>-
> 	return pci_register_driver(&ioat_pci_driver);
> }
> 
> module_init(ioat_init_module);
> 
>+/* it's currently unsafe to unload this module */
>+#if 0
> static void __exit ioat_exit_module(void)
> {
> 	pci_unregister_driver(&ioat_pci_driver);
> }
> 
> module_exit(ioat_exit_module);
>+#endif


Acked-by: Shannon Nelson <shannon.nelson@...el.com>
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