Re: PATCH: SHM Bug in Highmem machines

From: Christoph Rohland (
Date: Wed May 10 2000 - 06:17:28 EST

Hi juan,

"Juan J. Quintela" <> writes:
> I think that SHM can't work in recent kernels, due to the fact
> that We call prepare_highmem_swapout without locking the page (that is
> necesary with the new semantics). If we don't do that change, the
> page returned by prepare_highmem_swapout will be already
> locked and our call to lock will sleep forever.
> Later, Juan.
> PD. Christoph, could you see if that helps your problems (you are the only
> person that I know that use highmem & shm).

Yes, your patch fixes the lockup.


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