Re: What protects cleanup_module() from open()?

Alan Cox (alan@lxorguk.ukuu.org.uk)
Tue, 30 Nov 1999 18:09:22 +0000 (GMT)

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> It will not help. After MOD_DEC_USE_COUNT dropped use count to zero,
> module can be unloaded while pc on one cpu is still inside it.
>
> The answer is: modules cannot be unloaded on an SMP system at all,
> if you do not want to crash.

I pointed this out to Linus and Dave about 6 months ago as with 2.2 its fairly
ok (kernel lock) with 2.3.x its a problem. There are ways to fix it for 2.4,
and since any user can trigger the event in 2.3.x it _has_ to be fixed before
2.4.0

Alan

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