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Re: [PATCH 7/7] DWARF: add the config option

From Ingo Molnar <mingo@kernel.org>
Newsgroups linux.kernel
Subject Re: [PATCH 7/7] DWARF: add the config option
Date 2017-05-23 07:50 +0200
Message-ID <tKaRI-7kh-7@gated-at.bofh.it> (permalink)
References (4 earlier) <tIXa9-7Bx-7@gated-at.bofh.it> <tIXjP-7UF-13@gated-at.bofh.it> <tIXDb-823-15@gated-at.bofh.it> <tJTxx-50U-19@gated-at.bofh.it> <tK33P-2tD-1@gated-at.bofh.it>
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* H. Peter Anvin <hpa@zytor.com> wrote:

> On 05/22/17 04:12, Ingo Molnar wrote:
> \>>
> >> This construct might be useful for other arches, which is why I called
> >> it "FP" instead of "BP".  But then I ruined that with the last 3 :-)
> > 
> > Please call it BP - 'FP' can easily be read as floating-point, making it all 
> > super-confusing. We should use canonical x86 register names and ordering - even
> > if not all registers are used straight away.
> > 
> 
> Seriously, I suspect that at the end of the day we will have reinvented
> DWARF.

Absolutely - the main difference is:

 - the debug-info implementation is _internal_ to the kernel so it can be fixed
   instead of "oh, wait 2 years for the toolchain to fix this particular bug, work
   it around in the kernel meanwhile" kind of crazy flow and dependencies. I.e. 
   the debug-info generation and parsing code is both part of the kernel Git tree 
   and can be iterated (and fixed) at once with.

 - the debug-info is auto-generated for assembly as well, leaving assembly code 
   maintainable.

 - the debug-info has a sane data structure designed for robustness and 
   compactness

So even if it's a subset of the existing complexity of dwarf et al we are still 
literally infinitely better off with this model.

Thanks,

	Ingo

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Thread

Re: [PATCH 7/7] DWARF: add the config option Josh Poimboeuf <jpoimboe@redhat.com> - 2017-05-19 23:00 +0200
  Re: [PATCH 7/7] DWARF: add the config option "H. Peter Anvin" <hpa@zytor.com> - 2017-05-19 23:10 +0200
    Re: [PATCH 7/7] DWARF: add the config option Josh Poimboeuf <jpoimboe@redhat.com> - 2017-05-19 23:30 +0200
      Re: [PATCH 7/7] DWARF: add the config option Josh Poimboeuf <jpoimboe@redhat.com> - 2017-05-19 23:40 +0200
        Re: [PATCH 7/7] DWARF: add the config option Andy Lutomirski <luto@kernel.org> - 2017-05-20 07:30 +0200
          Re: [PATCH 7/7] DWARF: add the config option Josh Poimboeuf <jpoimboe@redhat.com> - 2017-05-20 18:30 +0200
            Re: [PATCH 7/7] DWARF: add the config option Josh Poimboeuf <jpoimboe@redhat.com> - 2017-05-20 19:20 +0200
            Re: [PATCH 7/7] DWARF: add the config option "H.J. Lu" <hjl.tools@gmail.com> - 2017-05-20 22:10 +0200
              Re: [PATCH 7/7] DWARF: add the config option Andy Lutomirski <luto@kernel.org> - 2017-05-21 00:00 +0200
                Re: [PATCH 7/7] DWARF: add the config option "H.J. Lu" <hjl.tools@gmail.com> - 2017-05-21 00:30 +0200
                Re: [PATCH 7/7] DWARF: add the config option Jiri Kosina <jikos@kernel.org> - 2017-05-22 13:40 +0200
                Re: [PATCH 7/7] DWARF: add the config option "H.J. Lu" <hjl.tools@gmail.com> - 2017-05-22 16:50 +0200
              Re: [PATCH 7/7] DWARF: add the config option "H. Peter Anvin" <hpa@zytor.com> - 2017-05-22 23:20 +0200
                Re: [PATCH 7/7] DWARF: add the config option "H. Peter Anvin" <hpa@zytor.com> - 2017-05-22 23:50 +0200
                Re: [PATCH 7/7] DWARF: add the config option Josh Poimboeuf <jpoimboe@redhat.com> - 2017-05-23 00:20 +0200
          Re: [PATCH 7/7] DWARF: add the config option Linus Torvalds <torvalds@linux-foundation.org> - 2017-05-20 22:20 +0200
            Re: [PATCH 7/7] DWARF: add the config option Andy Lutomirski <luto@kernel.org> - 2017-05-21 00:00 +0200
              Re: [PATCH 7/7] DWARF: add the config option Linus Torvalds <torvalds@linux-foundation.org> - 2017-05-21 01:10 +0200
                Re: [PATCH 7/7] DWARF: add the config option Linus Torvalds <torvalds@linux-foundation.org> - 2017-05-21 01:30 +0200
      Re: [PATCH 7/7] DWARF: add the config option Ingo Molnar <mingo@kernel.org> - 2017-05-22 13:20 +0200
        Re: [PATCH 7/7] DWARF: add the config option "H. Peter Anvin" <hpa@zytor.com> - 2017-05-22 23:30 +0200
          Re: [PATCH 7/7] DWARF: add the config option Jiri Kosina <jikos@kernel.org> - 2017-05-23 01:30 +0200
          Re: [PATCH 7/7] DWARF: add the config option Ingo Molnar <mingo@kernel.org> - 2017-05-23 07:50 +0200
  Re: [PATCH 7/7] DWARF: add the config option "H. Peter Anvin" <hpa@zytor.com> - 2017-05-19 23:10 +0200

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