From: Vineet Gupta <vgupta@synopsys.com>
Date: Tue, 9 Jul 2013 11:36:40 +0000 (+0530)
Subject: ARC: Entry Handler tweaks: Optimize away redundant IRQ_DISABLE_SAVE
X-Git-Tag: v3.12-rc1~92^2~16
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fce16bc35ae4a45634f3dc348d8d297a25c277cf;p=pandora-kernel.git

ARC: Entry Handler tweaks: Optimize away redundant IRQ_DISABLE_SAVE

In the exception return path, for both U/K cases, intr are already
disabled (for various existing reasons). So when we drop down to
@restore_regs, we need not redo that.

There was subtle issue - when intr were NOT being disabled for
ret-to-kernel-but-no-preemption case - now fixed by moving the
IRQ_DISABLE further up in @resume_kernel_mode.

So what do we gain:

* Shaves off a few insn in return path.

* Eliminates the need for IRQ_DISABLE_SAVE assembler macro for ARCv2
  hence allows for entry code sharing.

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