On Thu, 24 Jan 2002, mulix wrote:
> On Thu, 24 Jan 2002, Shlomi Fish wrote:
>
> > We noticed our kernel module OOPSified kernels that used the new VM by
> > Andrea Archanageli, and we assumed it was still buggy, so we sticked with
> > the older one (which is by Rik van Riel IIRC). Now, in the last IGLU
> > meeting I had a talk with Moshe Bar who said, that it was not supposed to
> > work.
> >
> > The reason is that we used kmalloc and if we don't touch the buffer we
> > allocated for a long time, and then tried to access a pointer to a 5th or
> > greater page after its start, it is not guaranteed to succeed.
>
> that sounds completely bogus. i presume there was a misunderstanding
> somewhere.
>
Maybe I misunderstood what Moshe said. But he distinctively said that
something is not guaranteed to work.
> > <rant>
> > kmalloc is supposed to be similar to the malloc() userland function, which
> > gives you a dynamically allocated buffer for life. Why does not kmalloc
> > behaves that way in the new VM? Would it not break compatibility with many
> > third-party modules, like our own?
> > </rant>
>
> i dont believe it acts this way.
>
> fwiw, are you allcoating memory *only* using kmalloc? where does your
> code oops?
>
Yes, I do. I can run UML with it to check where the OOPS occurs, as I
don't remember exactly where it happens.
> > Can anybody clarify this situation?
>
> sure, but probably not on this list. you might want to try either
> kernelnewbies or the linux kernl maling list.
I will, thanks.
Regards,
Shlomi Fish
> --
> mulix
>
> http://vipe.technion.ac.il/~mulix/
> http://syscalltrack.sf.net/
>
>
>
> =================================================================
> To unsubscribe, send mail to [EMAIL PROTECTED] with
> the word "unsubscribe" in the message body, e.g., run the command
> echo unsubscribe | mail [EMAIL PROTECTED]
>
----------------------------------------------------------------------
Shlomi Fish [EMAIL PROTECTED]
Home Page: http://t2.technion.ac.il/~shlomif/
Home E-mail: [EMAIL PROTECTED]
"Let's suppose you have a table with 2^n cups..."
"Wait a second - is n a natural number?"
=================================================================
To unsubscribe, send mail to [EMAIL PROTECTED] with
the word "unsubscribe" in the message body, e.g., run the command
echo unsubscribe | mail [EMAIL PROTECTED]
