linux-kernel - Re: [PATCH v4 07/17] kbuild: generate module BTF based on vmlinux.unstripped

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Message-ID: <aYYYrcCv7ncfGyg-@levanger>
Date: Fri, 6 Feb 2026 17:37:01 +0100
From: Nicolas Schier <nsc@...nel.org>
To: Thomas Weißschuh <linux@...ssschuh.net>
Cc: Nathan Chancellor <nathan@...nel.org>, Arnd Bergmann <arnd@...db.de>,
	Luis Chamberlain <mcgrof@...nel.org>,
	Petr Pavlu <petr.pavlu@...e.com>,
	Sami Tolvanen <samitolvanen@...gle.com>,
	Daniel Gomez <da.gomez@...sung.com>,
	Paul Moore <paul@...l-moore.com>, James Morris <jmorris@...ei.org>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	Jonathan Corbet <corbet@....net>,
	Madhavan Srinivasan <maddy@...ux.ibm.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Nicholas Piggin <npiggin@...il.com>,
	Naveen N Rao <naveen@...nel.org>, Mimi Zohar <zohar@...ux.ibm.com>,
	Roberto Sassu <roberto.sassu@...wei.com>,
	Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
	Eric Snowberg <eric.snowberg@...cle.com>,
	Daniel Gomez <da.gomez@...nel.org>,
	Aaron Tomlin <atomlin@...mlin.com>,
	"Christophe Leroy (CS GROUP)" <chleroy@...nel.org>,
	Nicolas Bouchinet <nicolas.bouchinet@....cyber.gouv.fr>,
	Xiu Jianfeng <xiujianfeng@...wei.com>,
	Fabian Grünbichler <f.gruenbichler@...xmox.com>,
	Arnout Engelen <arnout@...t.net>,
	Mattia Rizzolo <mattia@...reri.org>, kpcyrd <kpcyrd@...hlinux.org>,
	Christian Heusel <christian@...sel.eu>,
	Câju Mihai-Drosi <mcaju95@...il.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, linux-modules@...r.kernel.org,
	linux-security-module@...r.kernel.org, linux-doc@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, linux-integrity@...r.kernel.org
Subject: Re: [PATCH v4 07/17] kbuild: generate module BTF based on
 vmlinux.unstripped

On Tue, Jan 13, 2026 at 01:28:51PM +0100, Thomas Weißschuh wrote:
> The upcoming module hashes functionality will build the modules in
> between the generation of the BTF data and the final link of vmlinux.
> At this point vmlinux is not yet built and therefore can't be used for
> module BTF generation. vmlinux.unstripped however is usable and
> sufficient for BTF generation.
> 
> Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
> ---
>  scripts/Makefile.modfinal | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/scripts/Makefile.modfinal b/scripts/Makefile.modfinal
> index adfef1e002a9..930db0524a0a 100644
> --- a/scripts/Makefile.modfinal
> +++ b/scripts/Makefile.modfinal
> @@ -40,11 +40,11 @@ quiet_cmd_ld_ko_o = LD [M]  $@
>  
>  quiet_cmd_btf_ko = BTF [M] $@
>        cmd_btf_ko = 							\
> -	if [ ! -f $(objtree)/vmlinux ]; then				\
> -		printf "Skipping BTF generation for %s due to unavailability of vmlinux\n" $@ 1>&2; \
> +	if [ ! -f $(objtree)/vmlinux.unstripped ]; then			\
> +		printf "Skipping BTF generation for %s due to unavailability of vmlinux.unstripped\n" $@ 1>&2; \
>  	else								\
> -		LLVM_OBJCOPY="$(OBJCOPY)" $(PAHOLE) -J $(PAHOLE_FLAGS) $(MODULE_PAHOLE_FLAGS) --btf_base $(objtree)/vmlinux $@; \
> -		$(RESOLVE_BTFIDS) -b $(objtree)/vmlinux $@;		\
> +		LLVM_OBJCOPY="$(OBJCOPY)" $(PAHOLE) -J $(PAHOLE_FLAGS) $(MODULE_PAHOLE_FLAGS) --btf_base $(objtree)/vmlinux.unstripped $@; \
> +		$(RESOLVE_BTFIDS) -b $(objtree)/vmlinux.unstripped $@;	\

Reviewed-by: Nicolas Schier <nsc@...nel.org> # kbuild

I'd like to have some BTF ack for that.

-- 
Nicolas