linux-kernel - subtle side effect of commit a1c48bb160f836

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Message-ID: <55826966.6050202@synopsys.com>
Date:	Thu, 18 Jun 2015 12:17:02 +0530
From:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Michal Marek <mmarek@...e.cz>
CC:	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: subtle side effect of  commit a1c48bb160f836

Hi Geert,

commit a1c48bb160f8368 "Makefile: Fix unrecognized cross-compiler command line
options" moved ARCH specific cc option handling before common -Os/O2 setup.

For ARC this had a subtle effect that we can no longer over-ride generic -O2 with
-O3, hence a performance regression observed going from 3.13 to 3.18 (the above
commit went into 3.16)

I want to understand how to properly fix this. Moving the include of arch makefile
will bring back the old issue. I can introduce another option to set default optim
level, but only arc/m32r care about it anyways.

Thx,
-Vineet
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