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kconfig: implement KCONFIG_PROBABILITY for randconfig

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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Ⓜ️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 <[email protected]>
[[email protected]: add to Documentation/]
Signed-off-by: "Yann E. MORIN" <[email protected]>
This commit is contained in:
Yann E. MORIN 2013-04-13 17:18:36 +02:00
commit e43956e607
2 changed files with 81 additions and 3 deletions
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27
Documentation/kbuild/kconfig.txt
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@ -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'