Re: [PATCH] compat_sys_read/write

[Christoph Hellwig]

On Thu, Jul 28, 2005 at 11:43:41PM +1000, Stephen Rothwell wrote:
> Hi all,
> 
> Someone mentioned the mess in evdev.c that is caused by the fact that the
> structures that are passed to/from user mode via read/write require
> conversion when this API is used from 32 bit tasks on 64 bit kernels. 
> Some "discussion" followed during which I suggested an idea originally
> from Matthew Wilcox of an arch-specific is_compat_task() function so that
> these places could be identified.  However it was considered better to
> instead implement compat_sys_read/write.

This looks totally horrible, especially as we'd need readv/writev and
pread/pwrite aswell.  I don't think anyone but Andi actually liked this
approach when discussed earlier.

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