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about MISC_DEVICES not being enabled in many defconfigs

To: linux-arm-kernel@lists.infradead.org, Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>, uclinux-dist-devel@blackfin.uclinux.org, linux-ia64@vger.kernel.org, linux-mips@linux-mips.org, linuxppc-dev@lists.ozlabs.org, linux-sh@vger.kernel.org, Borislav Petkov <bp@alien8.de>, Mike Frysinger <vapier@gentoo.org>, Andrew Morton <akpm@linux-foundation.org>
Subject: about MISC_DEVICES not being enabled in many defconfigs
From: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Date: Wed, 2 Mar 2011 21:48:03 +0100
Cc: kernel@pengutronix.de
Original-recipient: rfc822;linux-mips@linux-mips.org
Sender: linux-mips-bounce@linux-mips.org
User-agent: Mutt/1.5.20 (2009-06-14)
Hello,

while working on an defconfig (arm/mx27) I noticed that just updating
it[1] results in removing CONFIG_EEPROM_AT24=y.  The reason is that
since commit

        v2.6.36-5965-g5f2365d (misc devices: do not enable by default)

MISC_DEVICES isn't enabled anymore by default.  So all defconfigs that
have CONFIG_SOME_SYMBOL=y (or =m) (with SOME_SYMBOL depending on
MISC_DEVICES) but not CONFIG_MISC_DEVICES=y suffer from the same
problem.

As a defconfig that was reduced before 5f2365d obviously didn't have
CONFIG_MISC_DEVICES=y many defconfigs have that problem.

I did the following to (hopefully) find all affected defconfigs:

        $ git describe
        v2.6.38-rc7
        $ git ls-files drivers/misc | grep Kconfig | xargs grep -h ^config | 
sed 's/config \(.*\)/CONFIG_\1=/' > miscsymbols
        $ git ls-files *defconfig | xargs grep -L CONFIG_MISC_DEVICES= | xargs 
grep -F -f miscsymbols
        arch/arm/configs/afeb9260_defconfig:CONFIG_ATMEL_SSC=y
        arch/arm/configs/afeb9260_defconfig:CONFIG_EEPROM_AT24=y
        arch/arm/configs/at572d940hfek_defconfig:CONFIG_ATMEL_TCLIB=y
        arch/arm/configs/at572d940hfek_defconfig:CONFIG_ATMEL_SSC=m
        arch/arm/configs/at572d940hfek_defconfig:CONFIG_SENSORS_TSL2550=m
        arch/arm/configs/at572d940hfek_defconfig:CONFIG_DS1682=m
        arch/arm/configs/at91cap9adk_defconfig:CONFIG_ATMEL_SSC=y
        arch/arm/configs/at91rm9200_defconfig:CONFIG_ATMEL_TCLIB=y
        arch/arm/configs/at91rm9200_defconfig:CONFIG_EEPROM_LEGACY=m
        arch/arm/configs/at91sam9260ek_defconfig:CONFIG_ATMEL_SSC=y
        arch/arm/configs/at91sam9261ek_defconfig:CONFIG_ATMEL_SSC=y
        arch/arm/configs/at91sam9263ek_defconfig:CONFIG_ATMEL_SSC=y
        arch/arm/configs/at91sam9g20ek_defconfig:CONFIG_ATMEL_SSC=y
        arch/arm/configs/at91sam9rlek_defconfig:CONFIG_ATMEL_SSC=y
        arch/arm/configs/da8xx_omapl_defconfig:CONFIG_EEPROM_AT24=y
        arch/arm/configs/davinci_all_defconfig:CONFIG_EEPROM_AT24=y
        arch/arm/configs/ep93xx_defconfig:CONFIG_EEPROM_LEGACY=y
        arch/arm/configs/ixp2000_defconfig:CONFIG_EEPROM_LEGACY=y
        arch/arm/configs/ixp23xx_defconfig:CONFIG_EEPROM_LEGACY=y
        arch/arm/configs/ixp4xx_defconfig:CONFIG_EEPROM_LEGACY=y
        arch/arm/configs/mini2440_defconfig:CONFIG_SENSORS_TSL2550=m
        arch/arm/configs/mx27_defconfig:CONFIG_EEPROM_AT24=y
        arch/arm/configs/mx3_defconfig:CONFIG_EEPROM_AT24=y
        arch/arm/configs/neocore926_defconfig:CONFIG_ATMEL_PWM=y
        arch/arm/configs/neocore926_defconfig:CONFIG_ATMEL_TCLIB=y
        arch/arm/configs/omap2plus_defconfig:CONFIG_EEPROM_LEGACY=y
        arch/arm/configs/pcontrol_g20_defconfig:CONFIG_ATMEL_TCLIB=y
        arch/arm/configs/pcontrol_g20_defconfig:CONFIG_EEPROM_AT24=m
        arch/arm/configs/pnx4008_defconfig:CONFIG_EEPROM_LEGACY=m
        arch/arm/configs/raumfeld_defconfig:CONFIG_ISL29003=y
        arch/arm/configs/raumfeld_defconfig:CONFIG_TI_DAC7512=y
        arch/arm/configs/realview-smp_defconfig:CONFIG_ARM_CHARLCD=y
        arch/arm/configs/realview_defconfig:CONFIG_ARM_CHARLCD=y
        arch/arm/configs/s3c2410_defconfig:CONFIG_EEPROM_AT25=m
        arch/arm/configs/s3c2410_defconfig:CONFIG_EEPROM_LEGACY=m
        arch/arm/configs/s3c2410_defconfig:CONFIG_EEPROM_93CX6=m
        arch/arm/configs/s3c6400_defconfig:CONFIG_EEPROM_AT24=y
        arch/arm/configs/s5pc100_defconfig:CONFIG_EEPROM_AT24=y
        arch/arm/configs/versatile_defconfig:CONFIG_EEPROM_LEGACY=m
        arch/arm/configs/zeus_defconfig:CONFIG_EEPROM_AT24=m
        arch/avr32/configs/atngw100_mrmt_defconfig:CONFIG_ATMEL_PWM=y
        arch/avr32/configs/favr-32_defconfig:CONFIG_ATMEL_PWM=m
        arch/avr32/configs/favr-32_defconfig:CONFIG_ATMEL_TCLIB=y
        arch/avr32/configs/favr-32_defconfig:CONFIG_ATMEL_SSC=m
        arch/avr32/configs/hammerhead_defconfig:CONFIG_ATMEL_TCLIB=y
        arch/avr32/configs/merisc_defconfig:CONFIG_ATMEL_PWM=y
        arch/avr32/configs/merisc_defconfig:CONFIG_ATMEL_SSC=y
        arch/avr32/configs/mimc200_defconfig:CONFIG_ATMEL_TCLIB=y
        arch/avr32/configs/mimc200_defconfig:CONFIG_EEPROM_AT24=y
        arch/avr32/configs/mimc200_defconfig:CONFIG_EEPROM_AT25=y
        arch/blackfin/configs/BlackStamp_defconfig:CONFIG_EEPROM_AT25=y
        arch/blackfin/configs/H8606_defconfig:CONFIG_EEPROM_AT25=y
        arch/blackfin/configs/SRV1_defconfig:CONFIG_EEPROM_AT25=m
        arch/ia64/configs/generic_defconfig:CONFIG_SGI_IOC4=y
        arch/ia64/configs/generic_defconfig:CONFIG_SGI_XP=m
        arch/ia64/configs/gensparse_defconfig:CONFIG_SGI_IOC4=y
        arch/mips/configs/bigsur_defconfig:CONFIG_SGI_IOC4=m
        arch/mips/configs/bigsur_defconfig:CONFIG_EEPROM_LEGACY=y
        arch/mips/configs/bigsur_defconfig:CONFIG_EEPROM_MAX6875=y
        arch/mips/configs/gpr_defconfig:CONFIG_TIFM_CORE=m
        arch/mips/configs/ip32_defconfig:CONFIG_SGI_IOC4=y
        arch/mips/configs/markeins_defconfig:CONFIG_SGI_IOC4=m
        arch/mips/configs/pnx8550-jbs_defconfig:CONFIG_SGI_IOC4=m
        arch/mips/configs/rm200_defconfig:CONFIG_SGI_IOC4=m
        arch/mips/configs/sb1250-swarm_defconfig:CONFIG_SGI_IOC4=m
        arch/mips/configs/wrppmc_defconfig:CONFIG_SGI_IOC4=m
        arch/mips/configs/yosemite_defconfig:CONFIG_SGI_IOC4=m
        arch/powerpc/configs/44x/warp_defconfig:CONFIG_EEPROM_AT24=y
        arch/powerpc/configs/52xx/motionpro_defconfig:CONFIG_EEPROM_LEGACY=y
        arch/powerpc/configs/86xx/gef_ppc9a_defconfig:CONFIG_DS1682=y
        arch/powerpc/configs/86xx/gef_sbc310_defconfig:CONFIG_DS1682=y
        arch/powerpc/configs/86xx/gef_sbc610_defconfig:CONFIG_DS1682=y
        arch/powerpc/configs/86xx/mpc8641_hpcn_defconfig:CONFIG_EEPROM_LEGACY=y
        arch/powerpc/configs/e55xx_smp_defconfig:CONFIG_EEPROM_LEGACY=y
        arch/powerpc/configs/linkstation_defconfig:CONFIG_EEPROM_LEGACY=m
        arch/powerpc/configs/mpc512x_defconfig:CONFIG_EEPROM_AT24=y
        arch/powerpc/configs/mpc5200_defconfig:CONFIG_EEPROM_AT24=y
        arch/powerpc/configs/mpc85xx_defconfig:CONFIG_EEPROM_LEGACY=y
        arch/powerpc/configs/mpc85xx_smp_defconfig:CONFIG_EEPROM_LEGACY=y
        arch/powerpc/configs/mpc86xx_defconfig:CONFIG_EEPROM_LEGACY=y
        arch/powerpc/configs/pasemi_defconfig:CONFIG_EEPROM_LEGACY=y
        arch/powerpc/configs/ppc6xx_defconfig:CONFIG_ENCLOSURE_SERVICES=m
        arch/powerpc/configs/ppc6xx_defconfig:CONFIG_SENSORS_TSL2550=m
        arch/powerpc/configs/ppc6xx_defconfig:CONFIG_EEPROM_AT24=m
        arch/powerpc/configs/ppc6xx_defconfig:CONFIG_EEPROM_LEGACY=m
        arch/powerpc/configs/ppc6xx_defconfig:CONFIG_EEPROM_MAX6875=m
        arch/powerpc/configs/ppc6xx_defconfig:CONFIG_EEPROM_93CX6=m
        arch/sh/configs/se7206_defconfig:CONFIG_EEPROM_93CX6=y

(For those wondering about the commands above: A line 

        arch/$arch/configs/xyz_defconfig:CONFIG_SOME_DEVICE=y

means here, that running

        make ARCH=$arch xyz_defconfig

results in a config without SOME_DEVICE.

I don't know if that bothers you, but if it does, you should add

        CONFIG_MISC_DEVICES=y

to your defconfig.

Just to let you know ...

Best regards
Uwe

[1] make mx27_defconfig
    make savedefconfig
    mv defconfig arch/arm/configs/mx27_defconfig

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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