X-Git-Url: https://git.karo-electronics.de/?a=blobdiff_plain;f=Documentation%2Fkbuild%2Fkconfig-language.txt;h=c412c245848f9116fb05361bb78e5189b43cfd51;hb=dec14f8c0eff54549e5747f8a4d1dc6c0347e2dd;hp=00b950d1c1931a7b20c19c2595eb2fbf062eb424;hpb=d626e3bf728c47746f2129aa00c775d4e8c2a73b;p=karo-tx-linux.git diff --git a/Documentation/kbuild/kconfig-language.txt b/Documentation/kbuild/kconfig-language.txt index 00b950d1c193..c412c245848f 100644 --- a/Documentation/kbuild/kconfig-language.txt +++ b/Documentation/kbuild/kconfig-language.txt @@ -377,27 +377,3 @@ config FOO limits FOO to module (=m) or disabled (=n). - -Build limited by a third config symbol which may be =y or =m -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -A common idiom that we see (and sometimes have problems with) is this: - -When option C in B (module or subsystem) uses interfaces from A (module -or subsystem), and both A and B are tristate (could be =y or =m if they -were independent of each other, but they aren't), then we need to limit -C such that it cannot be built statically if A is built as a loadable -module. (C already depends on B, so there is no dependency issue to -take care of here.) - -If A is linked statically into the kernel image, C can be built -statically or as loadable module(s). However, if A is built as loadable -module(s), then C must be restricted to loadable module(s) also. This -can be expressed in kconfig language as: - -config C - depends on A = y || A = B - -or for real examples, use this command in a kernel tree: - -$ find . -name Kconfig\* | xargs grep -ns "depends on.*=.*||.*=" | grep -v orig -