From: Al Viro <viro@zeniv.linux.org.uk>
Date: Thu, 18 Oct 2012 05:11:58 +0000 (-0400)
Subject: alpha: simplify fork and friends
X-Git-Tag: omap-for-v3.8/fixes-for-merge-window-v4-signed~47^2~47
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e0e431aa45416982eb3fddf34cedc72f1c3b3ce3;p=pandora-kernel.git

alpha: simplify fork and friends

* no need to restore everything from switch_stack when we only need $26
* no need to pass current_pt_regs() manually, we can just as easily
calculate it in alpha_clone/alpha_vfork ($8 + constant)
* interpretation of zero usp as "use the parent's" is simpler in copy_thread();
let fork and vfork just pass 0.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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