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authorYann E. MORIN <yann.morin.1998@free.fr>2013-04-13 22:49:13 +0200
committerYann E. MORIN <yann.morin.1998@free.fr>2013-04-25 00:16:25 +0200
commit0d8024c6ebadb68f1154377c2e1996b4e649e4c8 (patch)
treebd38ec60a908adf8cf7c75aa7b3b19fab52d9e64 /Documentation/kbuild
parent422c809f03f043d0950d8362214818e956a9daee (diff)
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kconfig: allow specifying the seed for randconfig
For reproducibility, it can be useful to be able to specify the seed to use to seed the RNG. Add a new KCONFIG_SEED environment variable which can be set to the seed to use: $ make KCONFIG_SEED=42 randconfig $ sha1sum .config 70a128c8dcc61303069e1be352cce64114dfcbca .config $ make KCONFIG_SEED=42 randconfig $ sha1sum .config 70a128c8dcc61303069e1be352cce64114dfcbca .config It's very usefull for eg. debugging the kconfig parser. Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Diffstat (limited to 'Documentation/kbuild')
-rw-r--r--Documentation/kbuild/kconfig.txt9
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/kbuild/kconfig.txt b/Documentation/kbuild/kconfig.txt
index b8b77bbc784f..dbf746b70553 100644
--- a/Documentation/kbuild/kconfig.txt
+++ b/Documentation/kbuild/kconfig.txt
@@ -90,6 +90,15 @@ disable the options that are explicitly listed in the specified
mini-config files.
______________________________________________________________________
+Environment variables for 'randconfig'
+
+KCONFIG_SEED
+--------------------------------------------------
+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.
+
+______________________________________________________________________
Environment variables for 'silentoldconfig'
KCONFIG_NOSILENTUPDATE
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