From: Anton Blanchard <anton@samba.org>
Date: Thu, 18 Sep 2014 23:40:19 +0000 (+1000)
Subject: powerpc: Implement load_unaligned_zeropad
X-Git-Tag: fixes-against-v3.18-rc2~117^2~61
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=de5946c03575fb8c222610a6ac6726a5deabad46;p=pandora-kernel.git

powerpc: Implement load_unaligned_zeropad

Implement a bi-arch and bi-endian version of load_unaligned_zeropad.

Since the fallback case is so rare, a userspace test harness was used
to test this on ppc64le, ppc64 and ppc32:

http://ozlabs.org/~anton/junkcode/test_load_unaligned_zeropad.c

It uses mprotect to force a SEGV across a page boundary, and a SEGV
handler to lookup the exception tables and run the fixup routine.
It also compares the result against a normal load.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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