linux-kernel - Re: [PATCH 0/2] *** Fix reformat

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Date:   Thu, 6 Jan 2022 12:02:25 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Samuel Zeter <samuelzeter@...il.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: [PATCH 0/2] *** Fix reformat_objdump.awk ***

On Thu, Jan 06, 2022 at 01:36:03PM +1100, Samuel Zeter wrote:
> These are two small patches which originally dealt with
> the problem found at:
> 
> https://github.com/ClangBuiltLinux/linux/issues/1364
> 
> The original steps to reproduce were:
> $ make -skj"$(nproc)" LLVM=1 LLVM_IAS=1 defconfig
> $ scripts/config -e X86_DECODER_SELFTEST
> $ make -skj"$(nproc)" LLVM=1 LLVM_IAS=1 olddefconfig bzImage
> 
> Which resulted in the error:
> arch/x86/tools/insn_decoder_test: warning: objdump says 0 bytes, but
> insn_get_length() says 2
> 
> Upon inspection it turned out llvm-objdump was formatting its
> output differently, which caused objdump_reformat.awk to incorrectly
> output its values.
> 
> After fixing that bug, a second one was seen where the instruction
> "wait" was incorrectly matched with "fwait", which again caused
> insn_decoder_test to fail.

Thanks a lot for sending these fixes!

I can confirm with this series and the removal of chkobjdump.awk [1] on
top of v5.16-rc8, the insn_decoder_test now passes with LLVM 11 through
14.

Tested-by: Nathan Chancellor <nathan@...nel.org>

For the future, I recommend putting the maintainers in the "To" field,
rather than "Cc", to ensure they actually see it. Additionally, I see
some small nits in the commit message that the tip maintainers might
comment on, see

https://www.kernel.org/doc/html/latest/process/maintainer-tip.html#changelog

for some more info.

Masami Hiramatsu originally wrote this file and has a few fixes to it
since, adding him now for review. The original thread is available at:

https://lore.kernel.org/r/20220106023606.283953-1-samuelzeter@gmail.com/

[1]: https://git.kernel.org/nathan/c/2f137c324b21f1c21b8830d8896cb9957009f969

Cheers,
Nathan