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Re: [PATCH] Kbuild: Move -Wmaybe-uninitialized to W=1

From Ingo Molnar <mingo@kernel.org>
Newsgroups linux.kernel
Subject Re: [PATCH] Kbuild: Move -Wmaybe-uninitialized to W=1
Date 2016-07-28 22:30 +0200
Message-ID <s006m-2MG-23@gated-at.bofh.it> (permalink)
References (3 earlier) <nBeOl-7wr-1@gated-at.bofh.it> <rZL7k-14A-23@gated-at.bofh.it> <rZORz-3Ef-9@gated-at.bofh.it> <rZYQV-20O-5@gated-at.bofh.it> <rZYQW-20O-21@gated-at.bofh.it>
Organization linux.* mail to news gateway

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* Linus Torvalds <torvalds@linux-foundation.org> wrote:

> On Thu, Jul 28, 2016 at 12:03 PM, Linus Torvalds
> <torvalds@linux-foundation.org> wrote:
> >
> > Once we get to the point that the warning is no longer useful, and is more 
> > pain than gain, it gets disabled.
> 
> Btw, I have a suspicion that you didn't realize that "-Wmaybe-uninitialized" is 
> separate from "-Wuninitialized" (which is *not* disabled).

I very much know the difference, as you can see from the commit IDs I cited.

> The "maybe-uninitialized" warning is literally gcc saying "I haven't really 
> followed all the logic, but from my broken understanding it isn't _obvious_ that 
> it is initialized".
> 
> And the problem is that a lot of gcc optimization choices basically move the 
> pointer of "obvious". So the warning is a bit random to begin with. And when the 
> gcc people screw thigns up, things go to hell in a handbasket.

Fair enough.

Thanks,

	Ingo

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Re: [PATCH] Kbuild: Move -Wmaybe-uninitialized to W=1 Borislav Petkov <bp@alien8.de> - 2016-07-28 06:30 +0200
  Re: [PATCH] Kbuild: Move -Wmaybe-uninitialized to W=1 Ingo Molnar <mingo@kernel.org> - 2016-07-28 10:30 +0200
    Re: [PATCH] Kbuild: Move -Wmaybe-uninitialized to W=1 Borislav Petkov <bp@alien8.de> - 2016-07-28 10:50 +0200
      Re: [PATCH] Kbuild: Move -Wmaybe-uninitialized to W=1 Ingo Molnar <mingo@kernel.org> - 2016-07-28 19:00 +0200
        Re: [PATCH] Kbuild: Move -Wmaybe-uninitialized to W=1 Ingo Molnar <mingo@kernel.org> - 2016-07-28 19:10 +0200
      Re: [PATCH] Kbuild: Move -Wmaybe-uninitialized to W=1 Markus Trippelsdorf <markus@trippelsdorf.de> - 2016-07-28 20:10 +0200
    Re: [PATCH] Kbuild: Move -Wmaybe-uninitialized to W=1 Linus Torvalds <torvalds@linux-foundation.org> - 2016-07-28 21:10 +0200
      Re: [PATCH] Kbuild: Move -Wmaybe-uninitialized to W=1 Linus Torvalds <torvalds@linux-foundation.org> - 2016-07-28 21:10 +0200
        Re: [PATCH] Kbuild: Move -Wmaybe-uninitialized to W=1 Ingo Molnar <mingo@kernel.org> - 2016-07-28 22:30 +0200
      Re: [PATCH] Kbuild: Move -Wmaybe-uninitialized to W=1 Linus Torvalds <torvalds@linux-foundation.org> - 2016-07-28 23:30 +0200
        Re: [PATCH] Kbuild: Move -Wmaybe-uninitialized to W=1 Borislav Petkov <bp@alien8.de> - 2016-07-29 12:20 +0200
          Re: [PATCH] Kbuild: Move -Wmaybe-uninitialized to W=1 Arnd Bergmann <arnd@arndb.de> - 2016-07-29 12:40 +0200
          Re: [PATCH] Kbuild: Move -Wmaybe-uninitialized to W=1 Linus Torvalds <torvalds@linux-foundation.org> - 2016-07-29 20:30 +0200
        Re: [PATCH] Kbuild: Move -Wmaybe-uninitialized to W=1 Arnd Bergmann <arnd@arndb.de> - 2016-07-29 12:20 +0200

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