Re: powerpc allyesconfig / allmodconfig linux-next next-20160729 - next-20160729 build failures

From	Arnd Bergmann <arnd@arndb.de>
Newsgroups	linux.kernel
Subject	Re: powerpc allyesconfig / allmodconfig linux-next next-20160729 - next-20160729 build failures
Date	2016-08-04 17:50 +0200
Message-ID	<s2t4e-2PF-27@gated-at.bofh.it> (permalink)
References	<s1OaK-WW-15@gated-at.bofh.it> <s2q6m-DV-27@gated-at.bofh.it> <s2t4e-2PF-29@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Thursday, August 4, 2016 11:54:18 PM CEST Nicholas Piggin wrote:
> On Thu, 4 Aug 2016 22:31:39 +1000
> Nicholas Piggin <npiggin@gmail.com> wrote:
> > On Thu, 04 Aug 2016 14:09:02 +0200
> > Arnd Bergmann <arnd@arndb.de> wrote:
> > > Nicolas Pitre has done some related work, adding him to Cc. IIRC we have
> > > actually had multiple implementations of -ffunction-sections/--gc-sections
> > > in the past that people have used in production, but none of them
> > > ever made it upstream.  
> 
> After some googling around it seems lto has been difficult to
> get in and it was agreed this gc-sections should be done first
> anyway (although it may indeed provide a superset of DCE, but
> it's always going to be more costly and complicated). Lto would
> have the same issue with liveness of entry points, which is
> really the only thing you need change in the kernel as far as I
> can see.

Ok, good.

> I didn't really see what problems people were having with it
> though, so maybe it's architecture specific or something I
> haven't run into yet.

I remember trying it a few years ago without success, it's possible
that old binutils versions were more problematic.

I'm happy to test your patches on ARM, with my randconfig builder
I tend to find obscure bugs in corner cases that you might not
normally find with just defconfig/allmodconfig builds.

	Arnd

Thread

powerpc allyesconfig / allmodconfig linux-next next-20160729 -  next-20160729 build failures "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-08-02 22:10 +0200
  Re: powerpc allyesconfig / allmodconfig linux-next next-20160729 -  next-20160729 build failures Guenter Roeck <linux@roeck-us.net> - 2016-08-03 00:00 +0200
    Re: powerpc allyesconfig / allmodconfig linux-next next-20160729 -  next-20160729 build failures "Luis R. Rodriguez" <mcgrof@kernel.org> - 2016-08-03 00:30 +0200
      Re: powerpc allyesconfig / allmodconfig linux-next next-20160729 - next-20160729 build failures Arnd Bergmann <arnd@arndb.de> - 2016-08-03 00:50 +0200
      Re: powerpc allyesconfig / allmodconfig linux-next next-20160729 -  next-20160729 build failures Stephen Rothwell <sfr@canb.auug.org.au> - 2016-08-03 02:30 +0200
        Re: powerpc allyesconfig / allmodconfig linux-next next-20160729 - next-20160729 build failures Arnd Bergmann <arnd@arndb.de> - 2016-08-03 10:00 +0200
          Re: powerpc allyesconfig / allmodconfig linux-next next-20160729 -  next-20160729 build failures Stephen Rothwell <sfr@canb.auug.org.au> - 2016-08-03 14:30 +0200
            Re: powerpc allyesconfig / allmodconfig linux-next next-20160729 - next-20160729 build failures Arnd Bergmann <arnd@arndb.de> - 2016-08-03 14:40 +0200
              Re: powerpc allyesconfig / allmodconfig linux-next next-20160729 -  next-20160729 build failures Nicholas Piggin <npiggin@gmail.com> - 2016-08-03 18:00 +0200
                Re: powerpc allyesconfig / allmodconfig linux-next next-20160729 - next-20160729 build failures Arnd Bergmann <arnd@arndb.de> - 2016-08-03 21:10 +0200
                Re: powerpc allyesconfig / allmodconfig linux-next next-20160729 - next-20160729 build failures Arnd Bergmann <arnd@arndb.de> - 2016-08-03 22:20 +0200
                Re: powerpc allyesconfig / allmodconfig linux-next next-20160729 - next-20160729 build failures Segher Boessenkool <segher@kernel.crashing.org> - 2016-08-03 22:50 +0200
                Re: powerpc allyesconfig / allmodconfig linux-next next-20160729 -  next-20160729 build failures Stephen Rothwell <sfr@canb.auug.org.au> - 2016-08-04 02:20 +0200
                Re: powerpc allyesconfig / allmodconfig linux-next next-20160729 - next-20160729 build failures Arnd Bergmann <arnd@arndb.de> - 2016-08-04 11:10 +0200
                Re: powerpc allyesconfig / allmodconfig linux-next next-20160729 - next-20160729 build failures Arnd Bergmann <arnd@arndb.de> - 2016-08-04 12:50 +0200
                Re: powerpc allyesconfig / allmodconfig linux-next next-20160729 -  next-20160729 build failures Nicholas Piggin <npiggin@gmail.com> - 2016-08-04 13:50 +0200
                Re: powerpc allyesconfig / allmodconfig linux-next next-20160729 - next-20160729 build failures Arnd Bergmann <arnd@arndb.de> - 2016-08-04 14:20 +0200
                Re: powerpc allyesconfig / allmodconfig linux-next next-20160729 -  next-20160729 build failures Nicholas Piggin <npiggin@gmail.com> - 2016-08-04 14:40 +0200
                Re: powerpc allyesconfig / allmodconfig linux-next next-20160729 - next-20160729 build failures Arnd Bergmann <arnd@arndb.de> - 2016-08-04 17:50 +0200
                Re: powerpc allyesconfig / allmodconfig linux-next next-20160729 -  next-20160729 build failures Nicholas Piggin <npiggin@gmail.com> - 2016-08-04 18:10 +0200
                Re: powerpc allyesconfig / allmodconfig linux-next next-20160729 - next-20160729 build failures Arnd Bergmann <arnd@arndb.de> - 2016-08-04 18:20 +0200
                Re: powerpc allyesconfig / allmodconfig linux-next next-20160729 - next-20160729 build failures Segher Boessenkool <segher@kernel.crashing.org> - 2016-08-04 20:30 +0200
                Re: powerpc allyesconfig / allmodconfig linux-next next-20160729 -  next-20160729 build failures Nicholas Piggin <npiggin@gmail.com> - 2016-08-05 10:50 +0200
                Re: powerpc allyesconfig / allmodconfig linux-next next-20160729 - next-20160729 build failures Arnd Bergmann <arnd@arndb.de> - 2016-08-05 12:20 +0200
                Re: powerpc allyesconfig / allmodconfig linux-next next-20160729 -  next-20160729 build failures Nicholas Piggin <npiggin@gmail.com> - 2016-08-05 14:30 +0200
                Re: powerpc allyesconfig / allmodconfig linux-next next-20160729 - next-20160729 build failures Arnd Bergmann <arnd@arndb.de> - 2016-08-05 18:10 +0200
                Re: powerpc allyesconfig / allmodconfig linux-next next-20160729 -  next-20160729 build failures Nicholas Piggin <npiggin@gmail.com> - 2016-08-05 18:20 +0200
                Re: powerpc allyesconfig / allmodconfig linux-next next-20160729 - next-20160729 build failures Arnd Bergmann <arnd@arndb.de> - 2016-08-05 21:20 +0200
                Re: powerpc allyesconfig / allmodconfig linux-next next-20160729 -  next-20160729 build failures Nicholas Piggin <npiggin@gmail.com> - 2016-08-06 22:50 +0200
                Re: powerpc allyesconfig / allmodconfig linux-next next-20160729 - next-20160729 build failures Arnd Bergmann <arnd@arndb.de> - 2016-08-06 23:20 +0200
  Re: powerpc allyesconfig / allmodconfig linux-next next-20160729 - next-20160729 build failures Michael Ellerman <mpe@ellerman.id.au> - 2016-08-03 05:30 +0200

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