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Re: [PATCH] Fix mmap2 syscall for ColdFire
On Fri, Oct 02, 2009 at 02:16:25PM +0200, Andreas Schwab wrote:
> Maxim Kuvyrkov <maxim@codesourcery.com> writes:
>
> > Andreas Schwab wrote:
> >> Maxim Kuvyrkov <maxim@codesourcery.com> writes:
> >>
> >>> M68K linux port expects the argument of mmap2 syscall to be counted in
> >>> the memory pages.
> >>
> >> The offset is supposed to be always counted in units of 4k.
> >
> > Unfortunately, that is not the case for ColdFire.
>
> Which is a kernel bug.
It's a long-standing kernel ABI wart. I disagree that it's a bug, and
it would be a royal pain to have kernels with two different shift
amounts!
You can find discussions of this back to at least 2003, and I believe
uClibc has an mmap2 that agrees with current kernels.
--
Daniel Jacobowitz
CodeSourcery