[PATCH v3 0/8] Unify and , remove EXPORT_DATA_SYMBOL(), faster TRIM_UNUSED_KSYMS

Masahiro Yamada
2022-09-28T06:43:01Z

This patch set refactors EXPORT_SYMBOL, <linux/export.h> and <asm/export.h>.
Also, re-implement TRIM_UNUSED_KSYMS in one-pass.

You can still put EXPORT_SYMBOL() in *.S file, very close to the definition,
but you do not need to care about whether it is a function or a data.
Remove EXPORT_DATA_SYMBOL().

In v1, I broke ia64 because of missing distinction between functions and data.

V2 handles it correctly.
If the exported symbols is a function, KSYMTAB_FUNC is output.
Otherwise, KSYMTAB_DATA is output.

Changes in v3:
- Move to the head of the series
- New patch
- Move struct kernel_symbol to kernel/module/internal.h
- Some cleanups

Changes in v2:
- New patch
- Use KSYMTAB_FUNC and KSYMTAB_DATA for functions and data, respectively
This distinction is needed for ia64.
- New patch
- New patch

Masahiro Yamada (8):
kbuild: move modules.builtin(.modinfo) rules to Makefile.vmlinux_o
kbuild: rebuild .vmlinux.export.o when its prerequisite is updated
kbuild: generate KSYMTAB entries by modpost
ia64,export.h: replace EXPORT_DATA_SYMBOL* with EXPORT_SYMBOL*
modpost: squash sym_update_namespace() into sym_add_exported()
modpost: use null string instead of NULL pointer for default namespace
modpost: squash report_sec_mismatch() and remove enum mismatch
kbuild: implement CONFIG_TRIM_UNUSED_KSYMS without recursion

.gitignore | 1 -
Makefile | 37 ++----
arch/ia64/include/asm/Kbuild | 1 +
arch/ia64/include/asm/export.h | 3 -
arch/ia64/kernel/head.S | 2 +-
arch/ia64/kernel/ivt.S | 2 +-
include/asm-generic/export.h | 83 +-----------
include/linux/export-internal.h | 49 +++++++
include/linux/export.h | 114 +++-------------
kernel/module/internal.h | 12 ++
scripts/Makefile.build | 15 +--
scripts/Makefile.modpost | 8 +-
scripts/Makefile.vmlinux | 21 ++-
scripts/Makefile.vmlinux_o | 26 +++-
scripts/adjust_autoksyms.sh | 73 ----------
scripts/basic/fixdep.c | 3 +-
scripts/check-local-export | 4 +-
scripts/gen_autoksyms.sh | 62 ---------
scripts/gen_ksymdeps.sh | 30 -----
scripts/link-vmlinux.sh | 12 --
scripts/mod/modpost.c | 228 ++++++++++++++++----------------
scripts/mod/modpost.h | 1 +
scripts/remove-stale-files | 2 +
23 files changed, 270 insertions(+), 519 deletions(-)
delete mode 100644 arch/ia64/include/asm/export.h
delete mode 100755 scripts/adjust_autoksyms.sh
delete mode 100755 scripts/gen_autoksyms.sh
delete mode 100755 scripts/gen_ksymdeps.sh

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2.34.1