Re: [RFC][POWERPC] Provide a way to protect 4k subpages when using 64k pages

On Friday 07 December 2007, Paul Mackerras wrote:

I have re-purposed the ioperm system call for this. =A0The old ioperm
system call never did anything (except return an ENOSYS error) and in
fact never could have actually been useful for anything on the PowerPC
architecture, so nothing ever used it.

Couldn't there be a program that relies on ioperm to return -ENOSYS on
powerpc in order to fall back on some other method of I/O access?

The risk of actually breaking something is certainly low, but I think
you can never be sure here, so why not use a new syscall number?

	Arnd <><