uml: use DEFCONFIG_LIST to avoid reading host's config

This should make sure that, for UML, host's configuration files are not
considered, which avoids various pains to the user. Our dependency are such that
the obtained Kconfig will be valid and will lead to successful compilation -
however they cannot prevent an user from disabling any boot device, and if an
option is not set in the read .config (say /boot/config-XXX), with make
menuconfig ARCH=um, it is not set. This always disables UBD and all console I/O
channels, which leads to non-working UML kernels, so this bothers users -
especially now, since it will happen on almost every machine
(/boot/config-`uname -r` exists almost on every machine). It can be workarounded
with make defconfig ARCH=um, but it is non-obvious and can be avoided, so please
_do_ merge this patch.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Acked-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/arch/um/Kconfig b/arch/um/Kconfig
index 76e85bbaea55394790be7e9971b77859af0a1c88..a8dbc61b7bd636eba8ce42ae27c13b1622d1634b 100644 (file)
--- a/arch/um/Kconfig
+++ b/arch/um/Kconfig
@@ -1,3 +1,8 @@
+config DEFCONFIG_LIST
+       string
+       option defconfig_list
+       default "arch/$ARCH/defconfig"
+
 # UML uses the generic IRQ sugsystem
 config GENERIC_HARDIRQS
        bool

diff --git a/init/Kconfig b/init/Kconfig
index 9a7656f0b5ecff5a1d83e3a547ad6aafc08dfdc5..32be672de208eaead78c41d2c2607759ffc5ee4c 100644 (file)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1,5 +1,6 @@
 config DEFCONFIG_LIST
        string
+       depends on !UML
        option defconfig_list
        default "/lib/modules/$UNAME_RELEASE/.config"
        default "/etc/kernel-config"