linux-kernel - Re: [PATCH 5.15 102/107] kbuild: Add skip_encoding_btf

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Message-ID: <9f2f639e-2ccc-fe53-b285-041cddb9a92b@gmail.com>
Date:   Fri, 16 Sep 2022 13:25:19 -0300
From:   Martin Rodriguez Reboredo <yakoyoku@...il.com>
To:     Thorsten Leemhuis <linux@...mhuis.info>
Cc:     Jiri Olsa <jolsa@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 5.15 102/107] kbuild: Add skip_encoding_btf_enum64 option
 to pahole

On 9/16/22 07:21, Thorsten Leemhuis wrote:
> On 06.09.22 14:31, Greg Kroah-Hartman wrote:
>> From: Martin Rodriguez Reboredo <yakoyoku@...il.com>
>>
>> New pahole (version 1.24) generates by default new BTF_KIND_ENUM64 BTF tag,
>> which is not supported by stable kernel.
> 
> Martin, when you wrote "not supported by stable kernel", did you mean
> just 5.15.y or 5.19.y as well? Because I ran into...
> 
>> As a result the kernel with CONFIG_DEBUG_INFO_BTF option will fail to
>> compile with following error:
>>
>>   BTFIDS  vmlinux
>> FAILED: load BTF from vmlinux: Invalid argument
> 
> ...this compile error when compiling 5.19.9 for F37 and from a quick
> look into this it seems this was caused by a update of dwarves to 1.24
> that recently landed in that distribution. This patch seems to fix the
> problem (it got past the point of the error, but modules are still
> compiling).

Thorsten, by stable I've meant both current stable and longterm, i.e.
5.19 and below, and yes, I didn't sent a patch according to the stable
submission guidelines for 5.19 in time so I apologize for that. Gonna
send the patch for it. Thanks for reminding me.