This option does dead code and data elimination with the linker by compiling with -ffunction-sections -fdata-sections and linking with --gc-sections.
By selecting this option on mpc885_ads_defconfig, vmlinux LOAD segment size gets reduced by 10% Program Header before the patch: LOAD off 0x00010000 vaddr 0xc0000000 paddr 0x00000000 align 2**16 filesz 0x0036eda4 memsz 0x0038de04 flags rwx Program Header after the patch: LOAD off 0x00010000 vaddr 0xc0000000 paddr 0x00000000 align 2**16 filesz 0x00316da4 memsz 0x00334268 flags rwx Signed-off-by: Christophe Leroy <christophe.le...@c-s.fr> --- arch/powerpc/Kconfig | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 8fe4353be5e3..e1fac49cf465 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -888,6 +888,14 @@ config PPC_MEM_KEYS If unsure, say y. +config PPC_UNUSED_ELIMINATION + bool "Eliminate unused functions and data from vmlinux" + default n + select LD_DEAD_CODE_DATA_ELIMINATION + help + Select this to do dead code and data elimination with the linker + by compiling with -ffunction-sections -fdata-sections and linking + with --gc-sections. endmenu config ISA_DMA_API -- 2.13.3