Hi Masahiro, On Tue, 14 May 2019 13:16:37 +0900 Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx> wrote: > > If you are talking about the rebuild of > .tmp_versions/*.mod files, > yes, they are cleaned up every time. > > # Create temporary dir for module support files > # clean it up only when building all modules > cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ > $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) > > > I think the reason is that > we want to make sure stale modules are not remaining > when CONFIG_MY_DRIVER=m is turned into CONFIG_MY_DRIVER=n > > > Rebuilding .mod files is not expensive. > > I think this behavior can be improved, but > that is how it has been working for a long time. when you say "not expensive", how long is that? Because an x86_64 allmodconfig build currently produces 7313 of those files, so at .01 seconds each (for example) that would add over a minute to each of my builds ... and I do lots of builds every day. OK, so it may not be that significant (so a millisecond each is obviously not a problem), but just wondering if it can be avoided. -- Cheers, Stephen Rothwell
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