From: "Christophe Leroy (CS GROUP)" <chleroy@kernel.org>
To: Sathvika Vasireddy <sv@linux.ibm.com>,
nathan@kernel.org, nsc@kernel.org, maddy@linux.ibm.com,
mpe@ellerman.id.au, npiggin@gmail.com, 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
Subject: Re: [PATCH v1 0/6] objtool: Fixup alternate feature relative addresses
Date: Tue, 5 May 2026 11:05:35 +0200 [thread overview]
Message-ID: <c8249a6d-55ee-4ad2-83ac-c25f86759a46@kernel.org> (raw)
In-Reply-To: <20260505084628.17940-1-sv@linux.ibm.com>
Le 05/05/2026 à 10:46, Sathvika Vasireddy a écrit :
> 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.
What are the changes since last RFC
https://lore.kernel.org/linuxppc-dev/20260316062237.30948-1-sv@linux.ibm.com/
>
> 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(-)
>
next prev parent reply other threads:[~2026-05-05 9:05 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-05 8:46 [PATCH v1 0/6] objtool: Fixup alternate feature relative addresses Sathvika Vasireddy
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)
2026-05-05 15:56 ` 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 ` Christophe Leroy (CS GROUP) [this message]
2026-05-05 11:40 ` [PATCH v1 0/6] objtool: Fixup alternate feature relative addresses Peter Zijlstra
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