linux-stable.git/scripts/Makefile.vmlinux, branch linux-6.17.y

kbuild: Add '.rel.*' strip pattern for vmlinux

2025-10-19T14:37:15+00:00

[ Upstream commit 8ec3af916fe3954381cf3555ea03dc5adf4d0e8e ]

Prior to binutils commit c12d9fa2afe ("Support objcopy
--remove-section=.relaFOO") [1] in 2.32, stripping relocation sections
required the trailing period (i.e., '.rel.*') to work properly.

After commit 3e86e4d74c04 ("kbuild: keep .modinfo section in
vmlinux.unstripped"), there is an error with binutils 2.31.1 or earlier
because these sections are not properly removed:

  s390-linux-objcopy: st6tO8Ev: symbol `.modinfo' required but not present
  s390-linux-objcopy:st6tO8Ev: no symbols

Add the old pattern to resolve this issue (along with a comment to allow
cleaning this when binutils 2.32 or newer is the minimum supported
version). While the aforementioned kbuild change exposes this, the
pattern was originally changed by commit 71d815bf5dfd ("kbuild: Strip
runtime const RELA sections correctly"), where it would still be
incorrect with binutils older than 2.32.

Fixes: 71d815bf5dfd ("kbuild: Strip runtime const RELA sections correctly")
Link: https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=c12d9fa2afe7abcbe407a00e15719e1a1350c2a7 [1]
Reported-by: Linux Kernel Functional Testing 
Closes: https://lore.kernel.org/CA+G9fYvVktRhFtZXdNgVOL8j+ArsJDpvMLgCitaQvQmCx=hwOQ@mail.gmail.com/
Acked-by: Ard Biesheuvel 
Acked-by: Alexey Gladkov 
Acked-by: Nicolas Schier 
Link: https://patch.msgid.link/20251008-kbuild-fix-modinfo-regressions-v1-2-9fc776c5887c@kernel.org
Signed-off-by: Nathan Chancellor 
Signed-off-by: Sasha Levin

kbuild: Restore pattern to avoid stripping .rela.dyn from vmlinux

2025-10-19T14:37:15+00:00

[ Upstream commit 4b47a3aefb29c523ca66f0d28de8db15a10f9352 ]

Commit 0ce5139fd96e ("kbuild: always create intermediate
vmlinux.unstripped") removed the pattern to avoid stripping .rela.dyn
sections added by commit e9d86b8e17e7 ("scripts: Do not strip .rela.dyn
section"). Restore it so that .rela.dyn sections remain in the final
vmlinux.

Fixes: 0ce5139fd96e ("kbuild: always create intermediate vmlinux.unstripped")
Acked-by: Ard Biesheuvel 
Acked-by: Alexey Gladkov 
Acked-by: Nicolas Schier 
Link: https://patch.msgid.link/20251008-kbuild-fix-modinfo-regressions-v1-1-9fc776c5887c@kernel.org
Signed-off-by: Nathan Chancellor 
Stable-dep-of: 8ec3af916fe3 ("kbuild: Add '.rel.*' strip pattern for vmlinux")
Signed-off-by: Sasha Levin

kbuild: keep .modinfo section in vmlinux.unstripped

2025-10-19T14:37:15+00:00

[ Upstream commit 3e86e4d74c0490e5fc5a7f8de8f29e7579c9ffe5 ]

Keep the .modinfo section during linking, but strip it from the final
vmlinux.

Adjust scripts/mksysmap to exclude modinfo symbols from kallsyms.

This change will allow the next commit to extract the .modinfo section
from the vmlinux.unstripped intermediate.

Signed-off-by: Masahiro Yamada 
Signed-off-by: Alexey Gladkov 
Reviewed-by: Nicolas Schier 
Link: https://patch.msgid.link/aaf67c07447215463300fccaa758904bac42f992.1758182101.git.legion@kernel.org
Signed-off-by: Nathan Chancellor 
Stable-dep-of: 8ec3af916fe3 ("kbuild: Add '.rel.*' strip pattern for vmlinux")
Signed-off-by: Sasha Levin

kbuild: always create intermediate vmlinux.unstripped

2025-10-19T14:37:15+00:00

[ Upstream commit 0ce5139fd96e9d415d3faaef1c575e238f9bbd67 ]

Generate the intermediate vmlinux.unstripped regardless of
CONFIG_ARCH_VMLINUX_NEEDS_RELOCS.

If CONFIG_ARCH_VMLINUX_NEEDS_RELOCS is unset, vmlinux.unstripped and
vmlinux are identiacal.

This simplifies the build rule, and allows to strip more sections
by adding them to remove-section-y.

Signed-off-by: Masahiro Yamada 
Reviewed-by: Nicolas Schier 
Link: https://patch.msgid.link/a48ca543fa2305bd17324f41606dcaed9b19f2d4.1758182101.git.legion@kernel.org
Signed-off-by: Nathan Chancellor 
Stable-dep-of: 8ec3af916fe3 ("kbuild: Add '.rel.*' strip pattern for vmlinux")
Signed-off-by: Sasha Levin

kbuild: fix typos "module.builtin" to "modules.builtin"

2025-05-12T06:04:52+00:00

The filenames in the comments do not match the actual generated files.

Signed-off-by: Masahiro Yamada

kbuild: fix dependency on sorttable

2025-05-12T06:04:09+00:00

Commit ac4f06789b4f ("kbuild: Create intermediate vmlinux build with
relocations preserved") missed replacing one occurrence of "vmlinux"
that was added during the same development cycle.

Fixes: ac4f06789b4f ("kbuild: Create intermediate vmlinux build with relocations preserved")
Signed-off-by: Masahiro Yamada 
Acked-by: Ard Biesheuvel

scripts: Do not strip .rela.dyn section

2025-05-08T12:01:01+00:00

The .rela.dyn section contains runtime relocations and is only emitted
for a relocatable kernel.

riscv uses this section to relocate the kernel at runtime but that section
is stripped from vmlinux. That prevents kexec to successfully load vmlinux
since it does not contain the relocations info needed.

Fixes: 559d1e45a16d ("riscv: Use --emit-relocs in order to move .rela.dyn in init")
Tested-by: Björn Töpel 
Reviewed-by: Björn Töpel 
Acked-by: Ard Biesheuvel 
Link: https://lore.kernel.org/r/20250408072851.90275-1-alexghiti@rivosinc.com
Signed-off-by: Alexandre Ghiti

kbuild: Create intermediate vmlinux build with relocations preserved

2025-03-16T15:29:50+00:00

The imperative paradigm used to build vmlinux, extract some info from it
or perform some checks on it, and subsequently modify it again goes
against the declarative paradigm that is usually employed for defining
make rules.

In particular, the Makefile.postlink files that consume their input via
an output rule result in some dodgy logic in the decompressor makefiles
for RISC-V and x86, given that the vmlinux.relocs input file needed to
generate the arch-specific relocation tables may not exist or be out of
date, but cannot be constructed using the ordinary Make dependency based
rules, because the info needs to be extracted while vmlinux is in its
ephemeral, non-stripped form.

So instead, for architectures that require the static relocations that
are emitted into vmlinux when passing --emit-relocs to the linker, and
are subsequently stripped out again, introduce an intermediate vmlinux
target called vmlinux.unstripped, and organize the reset of the build
logic accordingly:

- vmlinux.unstripped is created only once, and not updated again
- build rules under arch/*/boot can depend on vmlinux.unstripped without
  running the risk of the data disappearing or being out of date
- the final vmlinux generated by the build is not bloated with static
  relocations that are never needed again after the build completes.

Signed-off-by: Ard Biesheuvel 
Signed-off-by: Masahiro Yamada

kbuild: link-vmlinux.sh: Make output file name configurable

2025-03-16T15:29:45+00:00

In order to introduce an intermediate, non-stripped vmlinux build that
can be used by other build steps as an input, pass the output file name
to link-vmlinux.sh via its command line.

Signed-off-by: Ard Biesheuvel 
Signed-off-by: Masahiro Yamada

kbuild: add dependency from vmlinux to sorttable

2025-03-15T12:19:44+00:00

Without this dependency it's really puzzling when we bisect for a "bad"
commit in a series of sorttable change: when "git bisect" switches to
another commit, "make" just does nothing to vmlinux.

Signed-off-by: Xi Ruoyao 
Acked-by: Steven Rostedt (Google) 
Signed-off-by: Masahiro Yamada