From: Stephen Rothwell <sfr@canb.auug.org.au>
To: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Linux Next Mailing List <linux-next@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: linux-next: build failure after merge of the ecryptfs tree
Date: Tue, 14 May 2019 14:49:42 +1000 [thread overview]
Message-ID: <20190514144942.403f0e96@canb.auug.org.au> (raw)
In-Reply-To: <CAK7LNAS-KDO0Cuq34T5MZvJjxZ-A3HaG3qnJi3v4P9xS=4fRQA@mail.gmail.com>
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Hi Masahiro,
On Tue, 14 May 2019 13:16:37 +0900 Masahiro Yamada <yamada.masahiro@socionext.com> 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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prev parent reply other threads:[~2019-05-14 4:49 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-14 0:15 linux-next: build failure after merge of the ecryptfs tree Stephen Rothwell
2019-05-14 0:40 ` Masahiro Yamada
2019-05-14 0:56 ` Stephen Rothwell
2019-05-14 1:22 ` Michael Schmitz
2019-05-15 4:28 ` Michael Schmitz
2019-05-14 1:03 ` Stephen Rothwell
2019-05-14 4:16 ` Masahiro Yamada
2019-05-14 4:49 ` Stephen Rothwell [this message]
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