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Mon, 16 Mar 2026 06:25:51 +0000 (GMT) From: Sathvika Vasireddy To: linux-kernel@vger.kernel.org, linux-kbuild@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Cc: nathan@kernel.org, masahiroy@kernel.org, kees@kernel.org, naveen@kernel.org, jpoimboe@kernel.org, peterz@infradead.org, npiggin@gmail.com, maddy@linux.ibm.com, segher@kernel.crashing.org, christophe.leroy@csgroup.eu, mingo@kernel.org, mpe@ellerman.id.au, sv@linux.ibm.com, nsc@kernel.org Subject: [RFC PATCH v4 5/6] kbuild: Add objtool integration for PowerPC feature fixups Date: Mon, 16 Mar 2026 11:52:36 +0530 Message-ID: <20260316062237.30948-6-sv@linux.ibm.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20260316062237.30948-1-sv@linux.ibm.com> References: <20260316062237.30948-1-sv@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-ORIG-GUID: hcagTk-zsqxwONzvp47iQ595Aq-776Ks X-Authority-Analysis: v=2.4 cv=KajfcAYD c=1 sm=1 tr=0 ts=69b7a279 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=Yq5XynenixoA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=k1iL6ZPSiERSBASioQUA:9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzE2MDA0NSBTYWx0ZWRfX4mwLllTvZ/im Rca5hVzY6Gl+5zr1LJ/5SQ5I3AjEzZuv5P5Bq/V2tgF2kIt8clM9eGkpaHmctRONb98lg1Psxbe uVDRsKO6xF0B8Ka5V9Anv3krWQaLAlZBjibObwFqxb+SzR+1m6VW0KUrQl/56x41v5DsfgF2QPS at4ZLbo+WmN86Jc6DoikwESeKdhr/HLVI3LkPZWtr/yC+EjTh0BbQBuzzlnq6ddwYFCc8Y7+wY+ oNdn9ZUSD2QLMMFANr438/evSh7ydL8QHSy9Q9IVtUoRmVDuypnKWDspeLpecSA2KAnr11Kl36s B993qIX50OGw1v9kYj9+Z+LYBuuiLaXX7hw4AWxZ+48h3WwbcbD77DziTagvzcsYlkmQca5DlmG 5CZx8QfSwDOz6Ato5cvIiSUJf4Xpy0LHG6PhMhyVvduQjj+MKWMHUb9v1y4tNCPhBU+FwEDQGQ5 spvHzUd5N+42D682uLg== X-Proofpoint-GUID: rR38sSfWR2jvZFCMdskex73pGmE8QcPr X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-16_02,2026-03-13_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 adultscore=0 spamscore=0 malwarescore=0 clxscore=1015 impostorscore=0 bulkscore=0 lowpriorityscore=0 priorityscore=1501 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603160045 Content-Type: text/plain; charset="utf-8" Add build system support for PowerPC feature fixup processing: - Add HAVE_OBJTOOL_FTR_FIXUP config option for architectures that support build-time feature fixup processing - Integrate objtool feature fixup processing into vmlinux build Suggested-by: Masahiro Yamada Signed-off-by: Sathvika Vasireddy Acked-by: Nicolas Schier # kbuild --- Makefile | 7 +++++++ scripts/Makefile.lib | 4 ++-- scripts/Makefile.vmlinux | 3 ++- 3 files changed, 11 insertions(+), 3 deletions(-) diff --git a/Makefile b/Makefile index 83ed80595378..861f5bec655c 100644 --- a/Makefile +++ b/Makefile @@ -1467,6 +1467,13 @@ ifdef CONFIG_OBJTOOL prepare: tools/objtool endif =20 +# CONFIG_OBJTOOL and CONFIG_HAVE_OBJTOOL_FTR_FIXUP are unrelated, separate +# options. It was integrated in objtool in order to borrow the elf parser, +# but this is different from how the other objtool commands are used. +ifdef CONFIG_HAVE_OBJTOOL_FTR_FIXUP +prepare: tools/objtool +endif + ifdef CONFIG_BPF ifdef CONFIG_DEBUG_INFO_BTF prepare: tools/bpf/resolve_btfids diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib index e429d68b8594..c9478c717574 100644 --- a/scripts/Makefile.lib +++ b/scripts/Makefile.lib @@ -179,10 +179,10 @@ cpp_flags =3D -Wp,-MMD,$(depfile) $(NOSTDINC_FLA= GS) $(LINUXINCLUDE) \ =20 ld_flags =3D $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) =20 -ifdef CONFIG_OBJTOOL - objtool :=3D $(objtree)/tools/objtool/objtool =20 +ifdef CONFIG_OBJTOOL + objtool-args-$(CONFIG_HAVE_JUMP_LABEL_HACK) +=3D --hacks=3Djump_label objtool-args-$(CONFIG_HAVE_NOINSTR_HACK) +=3D --hacks=3Dnoinstr objtool-args-$(CONFIG_MITIGATION_CALL_DEPTH_TRACKING) +=3D --hacks=3Dskyla= ke diff --git a/scripts/Makefile.vmlinux b/scripts/Makefile.vmlinux index fcae1e432d9a..a1bef0638ecb 100644 --- a/scripts/Makefile.vmlinux +++ b/scripts/Makefile.vmlinux @@ -65,7 +65,8 @@ ARCH_POSTLINK :=3D $(wildcard $(srctree)/arch/$(SRCARCH)/= Makefile.postlink) # Final link of vmlinux with optional arch pass after final link cmd_link_vmlinux =3D \ $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)" "$@"; \ - $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) + $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true); \ + $(if $(CONFIG_HAVE_OBJTOOL_FTR_FIXUP), $(objtool) --ftr-fixup --link $@, = true) =20 targets +=3D vmlinux.unstripped .vmlinux.export.o vmlinux.unstripped: scripts/link-vmlinux.sh vmlinux.o .vmlinux.export.o $(= KBUILD_LDS) FORCE --=20 2.43.0