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/[email protected]/
This patchset applies atop powerpc/merge branch.
[1] Original PowerPC tool approach:
http://patchwork.ozlabs.org/project/linuxppc-dev/patch/[email protected]/
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(-)
