From: Arnd Bergmann <a...@arndb.de> While experimenting with CONFIG_TRIM_UNUSED_KSYMS across architectures, I noticed that this unsurprisingly works best when combined with the --gc-sections linker flag, which is not currently allowed on m68k.
Enabling it with this patch shows significant improvements for kernel size, looking at m68k defconfig with gcc-10, I get 4005135 1374302 167108 5546545 54a231 vmlinux-normal 3916254 1378078 167108 5461440 5355c0 vmlinux+trim 4012933 1362514 164280 5539727 54878f vmlinux+gcsection 3797884 1334194 164640 5296718 50d24e vmlinux+gcsection+trim There are probably bugs somewhere, but if someone is able to test this patch and fix any issues that come up, would be a useful improvement for memory-limited machines. Link: https://lore.kernel.org/lkml/cak8p3a05vz9hskrzvtxtn+1nf9e+gqebjwtj6n23nfm+elh...@mail.gmail.com/ Signed-off-by: Arnd Bergmann <a...@arndb.de> --- arch/m68k/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig index c186733562b3..5f1aafa7b2e2 100644 --- a/arch/m68k/Kconfig +++ b/arch/m68k/Kconfig @@ -24,6 +24,7 @@ config M68K select HAVE_DEBUG_BUGVERBOSE select HAVE_FUTEX_CMPXCHG if MMU && FUTEX select HAVE_IDE + select HAVE_LD_DEAD_CODE_DATA_ELIMINATION select HAVE_MOD_ARCH_SPECIFIC select HAVE_UID16 select MMU_GATHER_NO_RANGE if MMU -- 2.29.2
