From: Paul Mackerras <paulus@samba.org>
Date: Wed, 20 Dec 2006 02:57:06 +0000 (+1100)
Subject: [POWERPC] Fix register save area alignment for swapcontext syscall
X-Git-Tag: v2.6.20-rc2~84^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1c9bb1a01ac1bc92a0d98cf3e40a7922ee684dc0;p=pandora-kernel.git

[POWERPC] Fix register save area alignment for swapcontext syscall

For 32-bit processes, the getcontext side of the swapcontext system
call (i.e. the saving of the context when the first argument is
non-NULL) has to set the ctx->uc_mcontext.uc_regs pointer to the place
where it saves the registers.  Which it does, but it doesn't ensure
that the pointer is 16-byte aligned.  16-byte alignment is needed
because the Altivec/VMX registers are saved in there, and they need to
be on a 16-byte boundary.

This fixes it by ensuring the appropriate alignment of the pointer.
This issue was pointed out by Jakub Jelinek.

Signed-off-by: Paul Mackerras <paulus@samba.org>
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