linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Linus Torvalds <torvalds@linux-foundation.org>
To: Masahiro Yamada <masahiroy@kernel.org>
Cc: Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [GIT PULL 2/2] Kconfig updates for v5.10-rc1
Date: Fri, 27 Nov 2020 13:08:19 -0800	[thread overview]
Message-ID: <CAHk-=wihYvkKOcXWPjY7wN13DXbh3k2YX_6JxK_1cQ=krbi9kg@mail.gmail.com> (raw)
In-Reply-To: <CAK7LNASn4Si3=YhAPtc06wEqajpU0uBh46-4T10f=cHy=LY2iA@mail.gmail.com>

Just a quick note, because it's been a small annoyance for a while (I
don't think it has anything to do with the 5.10 pull, I'm just
responding to your latest pull request)..

I have "make allmodconfig" taking unnecessarily long, and I finally
started asking myself "what's so expensive here". I'd expect it to be
basically instantaneous on my machine, and it isn't.

And when I looked at it, I noticed that it re-compiled
scripts/kconfig/conf every single time.

For no obvious reason I can see.

Doing a

       make --trace allmodconfig

shows a series of

    scripts/Makefile.host:112: target 'scripts/kconfig/....o' does not exist

lines, which is silly and wrong (they definitely exist), and I suspect
it's due to some confusion about the build directory or similar.

It's probably obvious to you once you start looking at it.

And yeah, I realize I'm being silly. Doing a "time make allmodconfig"
shows that it takes 1.5s to do. Should I care? No. But I feel that's
an eternity for something that I think should just be instantaneous.

                Linus

  parent reply	other threads:[~2020-11-27 21:12 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-22 13:49 [GIT PULL 2/2] Kconfig updates for v5.10-rc1 Masahiro Yamada
2020-10-22 20:25 ` pr-tracker-bot
2020-11-27 21:08 ` Linus Torvalds [this message]
2020-11-27 21:15   ` Linus Torvalds
2020-11-27 21:53     ` Linus Torvalds
2020-11-27 22:05       ` Linus Torvalds
2020-11-28  7:04         ` Masahiro Yamada
2020-11-28 18:28           ` Linus Torvalds
2020-12-02  0:55             ` Kees Cook
2020-12-02 12:53             ` Masahiro Yamada
2020-12-02 13:03               ` Masahiro Yamada
2020-12-02 18:58                 ` Kees Cook
2020-12-02 20:13               ` Linus Torvalds
  -- strict thread matches above, loose matches on Subject: below --
2020-10-22 13:47 Masahiro Yamada

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to='CAHk-=wihYvkKOcXWPjY7wN13DXbh3k2YX_6JxK_1cQ=krbi9kg@mail.gmail.com' \
    --to=torvalds@linux-foundation.org \
    --cc=linux-kbuild@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=masahiroy@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).