Messages in this thread | | | From | "dan carpenter" <> | Date | Tue, 09 Jul 2002 12:27:23 -0500 | Subject | Re: lock_kernel check... |
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----- Original Message ----- From: Dave Hansen <haveblue@us.ibm.com> Date: Tue, 09 Jul 2002 02:08:18 -0700 To: dan carpenter <error27@email.com> Subject: Re: lock_kernel check...
> cc'ing LKML 'cause this is interesting... > > dan carpenter wrote: > > As you can see, the attached script is dead simple. It prints an > > error every time you call return while lock_kernel is held. On > > your computer you will want to comment out print_url() and > > uncomment the regular print statement. > > I am continually amazed at all the simple, useful, cool stuff that > people come up with. I like! >
Glad you liked it. :)
Smatch.pm is from the smatch.sf.net scripts page. Smatch is a really unfinished code checker that I've been working on. It is based on reading the papers about the Stanford checker.
Unfortunately, after a night of sleep I realize that my script is broken for 2 reasons. 1) Smatch.pm is meant to track state changes down different code paths. But unfortunately it wasn't doing that in this case; it was just going down the code without taking into consideration any if_stmts etc. I'm extremely embarassed about that. Sorry. 2) What the Stanford checker does is print an error if one return_stmt is called while the kernel is locked and one is called while the kernel is unlocked. This seems reasonable.
I will fix both mistakes later on this week. Unfortunately I'm in the process of moving and looking for a job etc so I might not get to it for a bit.
regards, dan carpenter
PS. If you liked this script, try out my kmalloc script. I don't think anyone besides me has successfully installed it yet, so if you have any questions I'd be glad to help. :P My phone number until tomorrow evening is (510) 835-7695.
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