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At stage 2 modpost utility is used to check modules. In case of unresolved symbols modpost only prints warning. IMHO it is a good idea to fail compilation process in case of unresolved symbols (at least in modules coming with kernel), since usually such errors are left unnoticed, but kernel modules are broken. - new option '-w' is added to modpost: if option is specified, modpost only warns about unresolved symbols - modpost is called with '-w' for external modules in Makefile.modpost Signed-off-by: Andrey Mirkin <[email protected]> Signed-off-by: Kirill Korotaev <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Sam Ravnborg <[email protected]>