linux-kernel - Re: [PATCH v3 00/16] objtool: Enable and implement --mcount option on powerpc

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Date:   Wed, 14 Sep 2022 01:15:52 +0100
From:   Josh Poimboeuf <jpoimboe@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Sathvika Vasireddy <sv@...ux.ibm.com>, aik@...abs.ru,
        chenzhongjin@...wei.com, npiggin@...il.com,
        linux-kernel@...r.kernel.org, mingo@...hat.com,
        rostedt@...dmis.org, jpoimboe@...hat.com,
        naveen.n.rao@...ux.vnet.ibm.com, mbenes@...e.cz,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v3 00/16] objtool: Enable and implement --mcount option
 on powerpc

On Tue, Sep 13, 2022 at 04:13:52PM +0200, Peter Zijlstra wrote:
> On Mon, Sep 12, 2022 at 01:50:04PM +0530, Sathvika Vasireddy wrote:
> > Christophe Leroy (4):
> >   objtool: Fix SEGFAULT
> >   objtool: Use target file endianness instead of a compiled constant
> >   objtool: Use target file class size instead of a compiled constant
> 
> > Sathvika Vasireddy (12):
> >   objtool: Add --mnop as an option to --mcount
> >   objtool: Read special sections with alts only when specific options are selected
> >   objtool: Use macros to define arch specific reloc types
> >   objtool: Add arch specific function arch_ftrace_match()
> >   objtool/powerpc: Enable objtool to be built on ppc
> >   objtool/powerpc: Add --mcount specific implementation
> 
> >  tools/objtool/arch/powerpc/Build              |   2 +
> >  tools/objtool/arch/powerpc/decode.c           | 101 ++++++++++++++++++
> >  .../arch/powerpc/include/arch/cfi_regs.h      |  11 ++
> >  tools/objtool/arch/powerpc/include/arch/elf.h |  10 ++
> >  .../arch/powerpc/include/arch/special.h       |  21 ++++
> >  tools/objtool/arch/powerpc/special.c          |  19 ++++
> >  tools/objtool/arch/x86/decode.c               |   5 +
> >  tools/objtool/arch/x86/include/arch/elf.h     |   2 +
> >  .../arch/x86/include/arch/endianness.h        |   9 --
> >  tools/objtool/builtin-check.c                 |  14 +++
> >  tools/objtool/check.c                         |  53 ++++-----
> >  tools/objtool/elf.c                           |   8 +-
> >  tools/objtool/include/objtool/arch.h          |   2 +
> >  tools/objtool/include/objtool/builtin.h       |   1 +
> >  tools/objtool/include/objtool/elf.h           |   8 ++
> >  tools/objtool/include/objtool/endianness.h    |  32 +++---
> >  tools/objtool/orc_dump.c                      |  11 +-
> >  tools/objtool/orc_gen.c                       |   4 +-
> >  tools/objtool/special.c                       |   3 +-
> 
> This seems to painlessly merge with the objtool changes I have in
> queue.git/call-depth-tracking. After that all I need is the below little
> patch to make it to build ppc44x_defconfig + CONFIG_DYNAMIC_FTRACE=y.
> 
> So I think these patches can go through the powerpc tree if Michael
> wants. Josh you okay with that, or should we do something complicated?

I'm all for avoiding complicated, but let me try to give it a proper
review first.

-- 
Josh