linux-kernel - Re: [PATCH 0/6] x86/dumpstack: replace dump

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Date:   Fri, 16 Sep 2016 11:16:16 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        "H . Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org,
        Andy Lutomirski <luto@...capital.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Brian Gerst <brgerst@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Frederic Weisbecker <fweisbec@...il.com>,
        Byungchul Park <byungchul.park@....com>,
        Nilay Vaish <nilayvaish@...il.com>
Subject: Re: [PATCH 0/6] x86/dumpstack: replace dump_trace() with a new
 unwinder


* Josh Poimboeuf <jpoimboe@...hat.com> wrote:

> The last version was posted as part of a much larger patch set:
> 
>   https://lkml.kernel.org/r/cover.1471525031.git.jpoimboe@redhat.com
> 
> People complained about the set being too big, so it was split up into
> more digestible pieces.  All the prerequisite patches for the unwinder
> have now been merged.
> 
> See patch 1/6 for the background and justification for this change.
> 
> Josh Poimboeuf (6):
>   x86/unwind: add new unwind interface and implementations
>   perf/x86: convert perf_callchain_kernel() to use the new unwinder
>   x86/stacktrace: convert save_stack_trace_*() to use the new unwinder
>   oprofile/x86: convert x86_backtrace() to use the new unwinder
>   x86/dumpstack: convert show_trace_log_lvl() to use the new unwinder
>   x86/dumpstack: remove dump_trace() and related callbacks
> 
>  arch/x86/events/core.c            |  33 +++-----
>  arch/x86/include/asm/stacktrace.h |  46 +---------
>  arch/x86/include/asm/unwind.h     |  74 ++++++++++++++++
>  arch/x86/kernel/Makefile          |   6 ++
>  arch/x86/kernel/dumpstack.c       | 174 +++++++++++++++++---------------------
>  arch/x86/kernel/dumpstack_32.c    |  44 +---------
>  arch/x86/kernel/dumpstack_64.c    |  78 +----------------
>  arch/x86/kernel/stacktrace.c      |  74 +++++++---------
>  arch/x86/kernel/unwind_frame.c    |  93 ++++++++++++++++++++
>  arch/x86/kernel/unwind_guess.c    |  43 ++++++++++
>  arch/x86/oprofile/backtrace.c     |  39 ++++-----
>  11 files changed, 362 insertions(+), 342 deletions(-)
>  create mode 100644 arch/x86/include/asm/unwind.h
>  create mode 100644 arch/x86/kernel/unwind_frame.c
>  create mode 100644 arch/x86/kernel/unwind_guess.c

Looks good to me, but could you please rebase it on top of very latestest -tip, 
which has these bits from Andy included:

  1959a60182f4 x86/dumpstack: Pin the target stack when dumping it
  cb76c9398240 x86/dumpstack: Add get_stack_info() interface

... which create new conflicts with your series.

Thanks,

	Ingo