linux-kernel - Re: [PATCH] clk: sunxi-ng: select SUNXI_CCU

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Date:   Tue, 23 May 2017 15:19:40 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Stephen Boyd <sboyd@...eaurora.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Michael Turquette <mturquette@...libre.com>,
        Icenowy Zheng <icenowy@...c.io>,
        Tobias Regnery <tobias.regnery@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: sunxi-ng: select SUNXI_CCU_MULT for sun8i-a83t

On Mon, May 22, 2017 at 05:55:53PM -0700, Stephen Boyd wrote:
> On 05/22, Arnd Bergmann wrote:
> > We get a link error when CCU_MULT is not set with the
> > newly added driver:
> > 
> > drivers/clk/sunxi-ng/ccu-sun8i-a83t.o:(.data.__compound_literal.1+0x4): undefined reference to `ccu_mult_ops'
> > drivers/clk/sunxi-ng/ccu-sun8i-a83t.o:(.data.__compound_literal.3+0x4): undefined reference to `ccu_mult_ops'
> > 
> > Fixes: 46b492116666 ("clk: sunxi-ng: Add driver for A83T CCU")
> > Signed-off-by: Arnd Bergmann <arnd@...db.de>

Acked-by: Chen-Yu Tsai <wens@...e.org>

> Is there any way we can automate finding these build errors and
> prevent them from creeping into the tree? It may be asking too
> much, but it seems like we should be able to find these
> particular problems with some script that greps for ccu_*_ops and
> checks that any file's Kconfig symbol also has that selected.
> 
> Anyway, I'm just tired of seeing these sorts of things in my
> inbox.

The (ugly) script below does the trick, though it does give results
for some symbols that are indirectly selected:

SUN5I_CCU uses SUNXI_CCU_GATE but does not select it
SUN5I_CCU uses SUNXI_CCU_MUX but does not select it
SUN5I_CCU uses SUNXI_CCU_NKMP but does not select it
SUN6I_A31_CCU uses SUNXI_CCU_GATE but does not select it
SUN6I_A31_CCU uses SUNXI_CCU_MUX but does not select it
SUN8I_A23_CCU uses SUNXI_CCU_GATE but does not select it
SUN8I_A23_CCU uses SUNXI_CCU_MUX but does not select it
SUN8I_A33_CCU uses SUNXI_CCU_GATE but does not select it
SUN8I_A33_CCU uses SUNXI_CCU_MUX but does not select it
SUN8I_A83T_CCU uses SUNXI_CCU_MULT but does not select it
SUN8I_H3_CCU uses SUNXI_CCU_GATE but does not select it
SUN8I_H3_CCU uses SUNXI_CCU_MUX but does not select it
SUN8I_V3S_CCU uses SUNXI_CCU_GATE but does not select it
SUN8I_V3S_CCU uses SUNXI_CCU_MUX but does not select it
SUN9I_A80_CCU uses SUNXI_CCU_MUX but does not select it

------------------------------------------------------------------------

#!/bin/bash

LANG=C

for i in drivers/clk/sunxi-ng/ccu-*.o; do
	FILE=`basename $i`
	CLKS=`nm -g $i | grep -P -o "ccu_.*(?=_ops)" | tr [a-z] [A-Z]`
	CFG=`grep $FILE drivers/clk/sunxi-ng/Makefile |
		grep -P -o "(?<=CONFIG_)SUN[A-Z0-9_]*"`

	for clk in $CLKS; do
		perl -0777 -ne "/$CFG(.*?)^(?:config|endif)/sm; print \$1" \
			drivers/clk/sunxi-ng/Kconfig | grep -q "SUNXI_$clk" ||
			echo "$CFG uses SUNXI_$clk but does not select it"
	done
done

------------------------------------------------------------------------


Regards
ChenYu