Masahiro Yamada 4c56eb33e6 kbuild: keep symbols for symbol_get() even with CONFIG_TRIM_UNUSED_KSYMS ... Linus observed that the symbol_request(utf8_data_table) call fails when CONFIG_UNICODE=y and CONFIG_TRIM_UNUSED_KSYMS=y. symbol_get() relies on the symbol data being present in the ksymtab for symbol lookups. However, EXPORT_SYMBOL_GPL(utf8_data_table) is dropped due to CONFIG_TRIM_UNUSED_KSYMS, as no module references it in this case. Probably, this has been broken since commit dbacb0ef67 ("kconfig option for TRIM_UNUSED_KSYMS"). This commit addresses the issue by leveraging modpost. Symbol names passed to symbol_get() are recorded in the special .no_trim_symbol section, which is then parsed by modpost to forcibly keep such symbols. The .no_trim_symbol section is discarded by the linker scripts, so there is no impact on the size of the final vmlinux or modules. This commit cannot resolve the issue for direct calls to __symbol_get() because the symbol name is not known at compile-time. Although symbol_get() may eventually be deprecated, this workaround should be good enough meanwhile. Reported-by: Linus Torvalds <torvalds@linux-foundation.org> Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>		2025-02-06 01:08:58 +09:00
..
.gitignore	.gitignore: prefix local generated files with a slash	2021-05-02 00:43:35 +09:00
devicetable-offsets.c	usb: typec: Only use SVID for matching altmodes	2024-12-24 08:56:05 +01:00
empty.c
file2alias.c	Merge 6.13-rc7 into usb-next	2025-01-13 06:11:06 +01:00
Makefile	Makefile: remove redundant tool coverage variables	2024-05-14 23:35:48 +09:00
mk_elfconfig.c	modpost: detect endianness on run-time	2024-09-01 20:33:32 +09:00
modpost.c	kbuild: keep symbols for symbol_get() even with CONFIG_TRIM_UNUSED_KSYMS	2025-02-06 01:08:58 +09:00
modpost.h	kbuild: keep symbols for symbol_get() even with CONFIG_TRIM_UNUSED_KSYMS	2025-02-06 01:08:58 +09:00
sumversion.c	sumversion: Fix a memory leak in get_src_version()	2024-10-23 16:11:13 +09:00
symsearch.c	modpost: replace the use of NOFAIL() with xmalloc() etc.	2024-09-01 20:34:48 +09:00