From: Vineet Gupta <vgupta@synopsys.com>
Date: Mon, 27 May 2013 16:13:41 +0000 (+0530)
Subject: ARC: pt_regs update #3: Remove unused gutter at start of callee_regs
X-Git-Tag: omap-for-v3.11/fixes-for-merge-window~38^2~14
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=16f9afe651e8197fb7ce6df0990d8e2ad779e1af;p=pandora-kernel.git

ARC: pt_regs update #3: Remove unused gutter at start of callee_regs

This is trickier than prev two:

* context switching code saves kernel mode callee regs in the format of
  struct callee_regs thus needs adjustment. This also reduces the height
  of topmost kernel stack frame by 1 word.

* Since kernel stack unwinder is sensitive to height of topmost kernel
  stack frame, that needs a word of adjustment too.

ptrace needs a bit of updating since pt_regs now diverges from
user_regs_struct.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
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