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Date: Tue, 01 Jul 2025 13:37:37 +0200
Message-Id: <DB0OSTC6N4TL.2NK75K2CWE9JV@pwned.life>
Cc: "Greg Kroah-Hartman" <gregkh@linuxfoundation.org>, "Linus Torvalds"
 <torvalds@linux-foundation.org>, "Shuah Khan" <skhan@linuxfoundation.org>,
 <linux-kselftest@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
 <stable@vger.kernel.org>, "Achill Gilgenast" <fossdd@pwned.life>
Subject: Re: [RESEND PATCH v2] kallsyms: fix build without execinfo
From: "Achill Gilgenast" <fossdd@pwned.life>
To: "Andrew Morton" <akpm@linux-foundation.org>
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References: <20250622014608.448718-1-fossdd@pwned.life>
 <20250622113602.48092b368afc5f1729b45cb6@linux-foundation.org>
 <DATW4DAU81FO.388H7H1WSUKAB@pwned.life>
In-Reply-To: <DATW4DAU81FO.388H7H1WSUKAB@pwned.life>

On Mon Jun 23, 2025 at 1:53 PM CEST, Achill Gilgenast wrote:
> On Sun Jun 22, 2025 at 8:36 PM CEST, Andrew Morton wrote:
>> On Sun, 22 Jun 2025 03:45:49 +0200 Achill Gilgenast <fossdd@pwned.life> =
wrote:
>>
>>> Some libc's like musl libc don't provide execinfo.h since it's not part
>>> of POSIX. In order to fix compilation on musl, only include execinfo.h
>>> if available (HAVE_BACKTRACE_SUPPORT)
>>>=20
>>> This was discovered with c104c16073b7 ("Kunit to check the longest symb=
ol length")
>>> which starts to include linux/kallsyms.h with Alpine Linux' configs.
>>>=20
>>> ...
>>>
>>> --- a/tools/include/linux/kallsyms.h
>>> +++ b/tools/include/linux/kallsyms.h
>>> @@ -18,6 +18,7 @@ static inline const char *kallsyms_lookup(unsigned lo=
ng addr,
>>>  	return NULL;
>>>  }
>>> =20
>>> +#ifdef HAVE_BACKTRACE_SUPPORT
>>>  #include <execinfo.h>
>>>  #include <stdlib.h>
>>>  static inline void print_ip_sym(const char *loglvl, unsigned long ip)
>>
>> I'm not seeing anything in there which needs execinfo.h.  Can we simply
>> remove the inclusion?
>
> No, since backtrace_symbols is provided by execinfo.h.

Is there some status on it? I saw you picked it in mm-hotfixes-unstable,
but it got dropped out again.

Is there something I can do to push it?

Thanks!