From: Greg Kurz <gkurz@linux.vnet.ibm.com>
Date: Wed, 19 Mar 2014 16:02:51 +0000 (+0100)
Subject: powerpc/le: Big endian arguments for ppc_rtas()
X-Git-Tag: v3.15-rc1~124^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=599d2870425dcde3bf2a7d969d5977baa57feb8b;p=pandora-kernel.git

powerpc/le: Big endian arguments for ppc_rtas()

The ppc_rtas() syscall allows userspace to interact directly with RTAS.
For the moment, it assumes every thing is big endian and returns either
EINVAL or EFAULT when called in a little endian environment.

As suggested by Benjamin, to avoid bugs when userspace wants to pass
a non 32 bit value to RTAS, it is far better to stick with a simple
rationale: ppc_rtas() should be called with a big endian rtas_args
structure.

With this patch, it is now up to userspace to forge big endian arguments,
as expected by RTAS.

Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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