From: Sathvika Vasireddy <sv@linux•ibm.com>
To: nathan@kernel•org, nsc@kernel•org, maddy@linux•ibm.com,
mpe@ellerman•id.au, npiggin@gmail•com, chleroy@kernel•org,
jpoimboe@kernel•org, peterz@infradead•org, ojeda@kernel•org,
masahiroy@kernel•org, lossin@kernel•org, tamird@kernel•org,
thomas.weissschuh@linutronix•de, rostedt@goodmis•org,
ihor.solodrai@linux•dev, thuth@redhat•com, pmladek@suse•com,
aliceryhl@google•com, elver@google•com, kees@kernel•org,
legion@kernel•org, ardb@kernel•org, yuxuan.zuo@outlook•com,
alexghiti@rivosinc•com, alexandre.chartre@oracle•com,
bp@alien8•de, linux-kbuild@vger•kernel.org,
linux-kernel@vger•kernel.org, linuxppc-dev@lists•ozlabs.org,
sv@linux•ibm.com
Subject: [PATCH v1 0/6] objtool: Fixup alternate feature relative addresses
Date: Tue, 5 May 2026 14:16:22 +0530 [thread overview]
Message-ID: <20260505084628.17940-1-sv@linux.ibm.com> (raw)
This patch series implements build-time fixup of alternate feature
relative addresses for powerpc.
Previously, Nicholas Piggin proposed a build-time solution using a
custom PowerPC tool [1], which provided the foundation for this approach.
The current implementation leverages objtool's existing ELF parsing
infrastructure to do the same.
This patchset applies atop powerpc/merge branch.
[1] Original PowerPC tool approach:
http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20170521010130.13552-1-npiggin@gmail.com/
Testing:
Build and Boot tested on ppc64le, ppc64be, and ppc32be configs.
Sathvika Vasireddy (6):
objtool/powerpc: Add build-time fixup of alternate feature branch
targets
objtool: Set ELF_F_LAYOUT flag to preserve vmlinux segment layout
objtool: Fix "can't find starting instruction" warnings on vmlinux
objtool/powerpc: Skip jump destination analysis and unnanotated
intra-function call warnings for --ftr-fixup
kbuild: Add objtool integration for PowerPC feature fixups
powerpc: Enable build-time feature fixup processing by default
Makefile | 7 +
arch/powerpc/Kconfig | 3 +
arch/powerpc/Makefile | 5 +
arch/powerpc/include/asm/feature-fixups.h | 2 +-
arch/powerpc/kernel/vmlinux.lds.S | 8 +-
arch/powerpc/lib/feature-fixups.c | 12 -
scripts/Makefile.lib | 4 +-
scripts/Makefile.vmlinux | 11 +-
tools/objtool/arch/powerpc/decode.c | 15 +-
tools/objtool/arch/powerpc/special.c | 451 ++++++++++++++++++++++
tools/objtool/builtin-check.c | 2 +
tools/objtool/check.c | 57 ++-
tools/objtool/elf.c | 4 +
tools/objtool/include/objtool/builtin.h | 1 +
tools/objtool/include/objtool/special.h | 56 +++
tools/objtool/special.c | 29 ++
16 files changed, 637 insertions(+), 30 deletions(-)
--
2.43.0
next reply other threads:[~2026-05-05 8:47 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-05 8:46 Sathvika Vasireddy [this message]
2026-05-05 8:46 ` [PATCH v1 1/6] objtool/powerpc: Add build-time fixup of alternate feature branch targets Sathvika Vasireddy
2026-05-05 14:45 ` Peter Zijlstra
2026-05-05 14:49 ` Peter Zijlstra
2026-05-05 15:48 ` Christophe Leroy (CS GROUP)
2026-05-06 7:17 ` Peter Zijlstra
2026-05-06 14:28 ` Segher Boessenkool
2026-05-05 15:56 ` Segher Boessenkool
2026-05-06 7:00 ` Peter Zijlstra
2026-05-06 13:58 ` Segher Boessenkool
2026-05-06 14:22 ` Peter Zijlstra
2026-05-06 14:42 ` Segher Boessenkool
2026-05-05 8:46 ` [PATCH v1 2/6] objtool: Set ELF_F_LAYOUT flag to preserve vmlinux segment layout Sathvika Vasireddy
2026-05-05 8:46 ` [PATCH v1 3/6] objtool: Fix "can't find starting instruction" warnings on vmlinux Sathvika Vasireddy
2026-05-05 8:46 ` [PATCH v1 4/6] objtool/powerpc: Skip jump destination analysis and unnanotated intra-function call warnings for --ftr-fixup Sathvika Vasireddy
2026-05-05 8:46 ` [PATCH v1 5/6] kbuild: Add objtool integration for PowerPC feature fixups Sathvika Vasireddy
2026-05-05 8:46 ` [PATCH v1 6/6] powerpc: Enable build-time feature fixup processing by default Sathvika Vasireddy
2026-05-05 9:05 ` [PATCH v1 0/6] objtool: Fixup alternate feature relative addresses Christophe Leroy (CS GROUP)
2026-05-05 11:40 ` Peter Zijlstra
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