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I am building a Linux kernel, via the Debian linux-2.6 source package.

Now there's CONFIG_VZ_FAIRSCHED=y in a sub-config, which gets merged into the final .config, where apparently also "y" gets used:

# grep FAIRSCHED debian/config/**/*

The .config used during build:

# grep FAIRSCHED debian/build/build_amd64_openvz_amd64/.config

I could understand the warning, if now "n" would be used, but nothing appears to have been changed?!

This is the output during the make -f debian/rules.gen binary-arch_amd64_openvz_amd64 binary-indep call:

make[2]: Entering directory `/var/lib/vz/private/linux.nobackup/linux-2.6/debian/build/source_amd64_openvz'
  HOSTCC  scripts/basic/fixdep
  HOSTCC  scripts/basic/docproc
  HOSTCC  scripts/basic/hash
  GEN     /var/lib/vz/private/linux.nobackup/linux-2.6/debian/build/build_amd64_openvz_amd64/Makefile
  HOSTCC  scripts/kconfig/conf.o
  HOSTCC  scripts/kconfig/kxgettext.o
  SHIPPED scripts/kconfig/zconf.tab.c
  SHIPPED scripts/kconfig/lex.zconf.c
  SHIPPED scripts/kconfig/zconf.hash.c
  HOSTCC  scripts/kconfig/zconf.tab.o
  HOSTLD  scripts/kconfig/conf
scripts/kconfig/conf -R arch/x86/Kconfig
.config:3518:warning: override: VZ_FAIRSCHED changes choice state

What is this warning referring to?

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Blind guess: CONFIG_VZ_FAIRSCHED=y forces a value in some other kernel configuration option. What does the help text for that option state?

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Here's the part from the OpenVZ patch, it does not appear to do much. +config VZ_FAIRSCHED + bool "OpenVZ groups" + help + This option add customizable task groups with OpenVZ compatible + syscall and procfs interface. + – blueyed Oct 22 '10 at 22:09

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