linux-kernel - Re: [PATCH 1/1] depmod: pass -P $CONFIG_SYMBOL

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Date:	Tue, 5 Feb 2013 10:33:19 +0000
From:	James Hogan <james.hogan@...tec.com>
To:	Mike Frysinger <vapier@...too.org>
CC:	<linux-kernel@...r.kernel.org>, Michal Marek <mmarek@...e.cz>,
	<linux-kbuild@...r.kernel.org>,
	Yoshinori Sato <ysato@...rs.sourceforge.jp>,
	<uclinux-dist-devel@...ckfin.uclinux.org>,
	Jonas <jonas.bonn@...il.com>
Subject: Re: [PATCH 1/1] depmod: pass -P $CONFIG_SYMBOL_PREFIX

Hi Mike,

On 03/02/13 06:17, Mike Frysinger wrote:
> On Thursday 31 January 2013 04:41:43 James Hogan wrote:
>> --- a/Makefile
>> +++ b/Makefile
>>
>> +ifneq ($(patsubst "%",%,$(CONFIG_SYMBOL_PREFIX)),)
>> +  depmod_args = -P $(patsubst "%",%,$(CONFIG_SYMBOL_PREFIX))
>> +endif
>> ...
>>  # Run depmod only if we have System.map and depmod is executable
>>  quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
>>        cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
>> -                   $(KERNELRELEASE)
>> +                   $(KERNELRELEASE) $(depmod_args)
> 
> scripts/Makefile.lib just does:
> 	ifdef CONFIG_SYMBOL_PREFIX
> so you should do the same

arch/openrisc/Kconfig now defines SYMBOL_PREFIX as "", so this isn't
sufficient (arguably it probably shouldn't be defined empty like that?)

> 
> that said, cmd_depmod is just a shell command.  and you're running another 
> script helper (depmod.sh).  how about passing it unconditionally ?
> 	cmd_depmod = ... -P "$(CONFIG_SYMBOL_PREFIX)"
> 
> since the default will be "no prefix", using -P "" is the same thing.

Yep, I could do this, but depmod.sh would need modifying to drop it if
the prefix is empty, otherwise you get the following from depmod:
FATAL: -P only takes a single char

I don't mind adding that, but what do you think?

> 
>> --- a/scripts/depmod.sh
>> +++ b/scripts/depmod.sh
>>
>>  DEPMOD=$1
>> -KERNELRELEASE=$2
>> +shift
>> +KERNELRELEASE=$1
>> +shift
> 
> you can do:
> 	DEPMOD=$1
> 	KERNELRELEASE=$2
> 	shift 2

neat, thanks

> 
>> +# older versions of depmod don't support -P <symbol-prefix>
>> +# support was added in module-init-tools 3.13
>> +if test "$1" = "-P"; then
>> +	release=$("$DEPMOD" --version)
>> +	package=$(echo "$release" | cut -d' ' -f 1)
>> +	if test "$package" = "module-init-tools"; then
>> +		version=$(echo "$release" | cut -d' ' -f 2)
>> +		later=$({ echo "$version"; echo "3.13"; } | sort -V | tail -n 1)
> 
> you could do instead:
> 	later=$(printf '%s\n' "$version" "3.13" | sort -V | tail -n 1)

yep, definitely better, thanks

> 
>> +		if test "$later" != "$version"; then
>> +			# module-init-tools < 3.13, drop the next 2 args
>> +			shift
>> +			shift
>> +		fi
> 
> shift 2

ok

Thanks for the suggestions

Cheers
James


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