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| author | Yann E. MORIN <yann.morin.1998@free.fr> | 2013-04-13 17:18:36 +0200 |
|---|---|---|
| committer | Yann E. MORIN <yann.morin.1998@free.fr> | 2013-04-25 00:16:30 +0200 |
| commit | e43956e607692f9b1c710311e4a6591ffba1edf0 (patch) | |
| tree | c42d170aa789a5ff0758a32b328e82ccbaa22142 /Documentation/kbuild | |
| parent | 0d8024c6ebadb68f1154377c2e1996b4e649e4c8 (diff) | |
| download | lwn-e43956e607692f9b1c710311e4a6591ffba1edf0.tar.gz lwn-e43956e607692f9b1c710311e4a6591ffba1edf0.zip | |
kconfig: implement KCONFIG_PROBABILITY for randconfig
Currently the odds to set each symbol is (rounded):
booleans: y: 50% n: 50%
tristates: y: 33% m: 33% n: 33%
Introduce a KCONFIG_PROBABILITY environment variable to tweak the
probabilities (in percentage), as such:
KCONFIG_PROBABILITY y:n split y:m:n split
-----------------------------------------------------------------
[1] unset or empty 50 : 50 33 : 33 : 34
[2] N N : 100-N N/2 : N/2 : 100-N
N:M N+M : 100-(N+M) N : M : 100-(N+M)
N:M:L N : 100-N M : L : 100-(M+L)
[1] The current behaviour is kept as default, for backward compatibility
[2] The solution initially implemented by Peter for Buildroot, see:
http://git.buildroot.org/buildroot/commit/?id=3435c1afb5
Signed-off-by: Peter Korsgaard <jacmet@uclibc.org>
[yann.morin.1998@free.fr: add to Documentation/]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Diffstat (limited to 'Documentation/kbuild')
| -rw-r--r-- | Documentation/kbuild/kconfig.txt | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/Documentation/kbuild/kconfig.txt b/Documentation/kbuild/kconfig.txt index dbf746b70553..3f429ed8b3b8 100644 --- a/Documentation/kbuild/kconfig.txt +++ b/Documentation/kbuild/kconfig.txt @@ -98,6 +98,33 @@ You can set this to the integer value used to seed the RNG, if you want to somehow debug the behaviour of the kconfig parser/frontends. If not set, the current time will be used. +KCONFIG_PROBABILITY +-------------------------------------------------- +This variable can be used to skew the probabilities. This variable can +be unset or empty, or set to three different formats: + KCONFIG_PROBABILITY y:n split y:m:n split + ----------------------------------------------------------------- + unset or empty 50 : 50 33 : 33 : 34 + N N : 100-N N/2 : N/2 : 100-N + [1] N:M N+M : 100-(N+M) N : M : 100-(N+M) + [2] N:M:L N : 100-N M : L : 100-(M+L) + +where N, M and L are integers (in base 10) in the range [0,100], and so +that: + [1] N+M is in the range [0,100] + [2] M+L is in the range [0,100] + +Examples: + KCONFIG_PROBABILITY=10 + 10% of booleans will be set to 'y', 90% to 'n' + 5% of tristates will be set to 'y', 5% to 'm', 90% to 'n' + KCONFIG_PROBABILITY=15:25 + 40% of booleans will be set to 'y', 60% to 'n' + 15% of tristates will be set to 'y', 25% to 'm', 60% to 'n' + KCONFIG_PROBABILITY=10:15:15 + 10% of booleans will be set to 'y', 90% to 'n' + 15% of tristates will be set to 'y', 15% to 'm', 70% to 'n' + ______________________________________________________________________ Environment variables for 'silentoldconfig' |