pch on sparc64

[Daniel Jacobowitz]

On Sat, Nov 06, 2004 at 05:08:43PM -0800, David S. Miller wrote:
> 
> PCH has been failing for quite some time on sparc64 and some other
> similar Linux platforms.
> 
> The reason why is that file mmap()'s are enforced to certain boundaries
> on sparc64 under Linux in order to address data-cache aliasing issues.
> 
> GCC wants the thing mapped at a specific address, and if it doesn't get
> that specific address it fails.  Fixing this is not easy.
> 
> There were threads about this some time ago.  When PCH works on these
> platforms, it is by chance.

GCC already aligns the mapping to some particular offset (usually the
page size).  It should be trivial to inform GCC to round to a higher
offset.

-- 
Daniel Jacobowitz