On Mon, 2015-04-13 at 15:17 -0500, Jeff Weber wrote:
> $ cat ext4.cfg
> CONFIG_EXT4_FS=y
>
> $ KCONFIG_ALLCONFIG=ext4.cfg make allnoconfig
>
> $ grep CONFIG_EXT4_FS .config || echo not found
> not found
>
> Why was CONFIG_EXT4_FS not set?
A search of EXT4_FS in make menuconfig inspired me to add
CONFIG_BLOCK=y
to ext4.cfg.
> Case 2: Attempt to disable SLUB_DEBUG using alldefconfig target.
> Search of Kconfigs shows no other configs select SLUB_DEBUG .
>
> $ cat no-slub-debug.cfg
> CONFIG_SLUB_DEBUG=n
>
> $ KCONFIG_ALLCONFIG=no-slub-debug.cfg make alldefconfig
>
> $ grep SLUB_DEBUG .config
> CONFIG_SLUB_DEBUG=y
> # CONFIG_SLUB_DEBUG_ON is not set
>
> Why was CONFIG_SLUB_DEBUG not disabled?
Seeing that the Kconfig entry for SLUB_DEBUG reads
config SLUB_DEBUG
default y
bool "Enable SLUB debugging support" if EXPERT
depends on SLUB && SYSFS
help
[...]
I guessed that this no-slub-debug.cfg might work:
CONFIG_EXPERT=y
# CONFIG_SLUB_DEBUG is not set
Please don't ask me to explain why.
Paul Bolle
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