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kbuild: keep .modinfo section in vmlinux.unstripped

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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 <masahiroy@kernel.org>
Signed-off-by: Alexey Gladkov <legion@kernel.org>
Reviewed-by: Nicolas Schier <nsc@kernel.org>
Link: https://patch.msgid.link/aaf67c07447215463300fccaa758904bac42f992.1758182101.git.legion@kernel.org
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
This commit is contained in:
Masahiro Yamada 2025-09-18 10:05:47 +02:00 committed by Nathan Chancellor
parent 0ce5139fd9
commit 3e86e4d74c
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GPG key ID: 1D6B269171C01A96
3 changed files with 9 additions and 3 deletions
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2
include/asm-generic/vmlinux.lds.h
View file

@ -831,6 +831,7 @@ defined(CONFIG_AUTOFDO_CLANG) || defined(CONFIG_PROPELLER_CLANG)
/* Required sections not related to debugging. */ /* Required sections not related to debugging. */
#define ELF_DETAILS \ #define ELF_DETAILS \
.modinfo : { *(.modinfo) } \
.comment 0 : { *(.comment) } \ .comment 0 : { *(.comment) } \
.symtab 0 : { *(.symtab) } \ .symtab 0 : { *(.symtab) } \
.strtab 0 : { *(.strtab) } \ .strtab 0 : { *(.strtab) } \
@ -1044,7 +1045,6 @@ defined(CONFIG_AUTOFDO_CLANG) || defined(CONFIG_PROPELLER_CLANG)
*(.discard.*) \ *(.discard.*) \
*(.export_symbol) \ *(.export_symbol) \
*(.no_trim_symbol) \ *(.no_trim_symbol) \
*(.modinfo) \
/* ld.bfd warns about .gnu.version* even when not emitted */ \ /* ld.bfd warns about .gnu.version* even when not emitted */ \
*(.gnu.version*) \ *(.gnu.version*) \

7
scripts/Makefile.vmlinux
View file

@ -86,11 +86,14 @@ endif
# vmlinux # vmlinux
# --------------------------------------------------------------------------- # ---------------------------------------------------------------------------
remove-section-y := remove-section-y := .modinfo
remove-section-$(CONFIG_ARCH_VMLINUX_NEEDS_RELOCS) += '.rel*' remove-section-$(CONFIG_ARCH_VMLINUX_NEEDS_RELOCS) += '.rel*'
# To avoid warnings: "empty loadable segment detected at ..." from GNU objcopy,
# it is necessary to remove the PT_LOAD flag from the segment.
quiet_cmd_strip_relocs = OBJCOPY $@ quiet_cmd_strip_relocs = OBJCOPY $@
cmd_strip_relocs = $(OBJCOPY) $(addprefix --remove-section=,$(remove-section-y)) $< $@ cmd_strip_relocs = $(OBJCOPY) $(patsubst %,--set-section-flags %=noload,$(remove-section-y)) $< $@; \
$(OBJCOPY) $(addprefix --remove-section=,$(remove-section-y)) $@
targets += vmlinux targets += vmlinux
vmlinux: vmlinux.unstripped FORCE vmlinux: vmlinux.unstripped FORCE

3
scripts/mksysmap
View file

@ -79,6 +79,9 @@
/ _SDA_BASE_$/d / _SDA_BASE_$/d
/ _SDA2_BASE_$/d / _SDA2_BASE_$/d
# MODULE_INFO()
/ __UNIQUE_ID_modinfo[0-9]*$/d
# --------------------------------------------------------------------------- # ---------------------------------------------------------------------------
# Ignored patterns # Ignored patterns
# (symbols that contain the pattern are ignored) # (symbols that contain the pattern are ignored)