From 9e4b5361ede355b621bc340e55bfc67e4084b688 Mon Sep 17 00:00:00 2001 From: Sami Tolvanen Date: Mon, 23 May 2022 21:16:19 +0800 Subject: [PATCH] kbuild: lto: merge module sections stable inclusion from stable-v5.10.102 commit 8b53e5f737bcf64226298c16c3920e7f0807ab94 bugzilla: https://gitee.com/openeuler/kernel/issues/I567K6 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=8b53e5f737bcf64226298c16c3920e7f0807ab94 -------------------------------- commit dd2776222abb9893e5b5c237a2c8c880d8854cee upstream. LLD always splits sections with LTO, which increases module sizes. This change adds linker script rules to merge the split sections in the final module. Suggested-by: Nick Desaulniers Signed-off-by: Sami Tolvanen Reviewed-by: Kees Cook Signed-off-by: Kees Cook Link: https://lore.kernel.org/r/20201211184633.3213045-6-samitolvanen@google.com Cc: Stephen Boyd Signed-off-by: Greg Kroah-Hartman Signed-off-by: Yu Liao Reviewed-by: Wei Li Signed-off-by: Zheng Zengkai --- scripts/module.lds.S | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/scripts/module.lds.S b/scripts/module.lds.S index 088a5a2c446d..29bc24d5c906 100644 --- a/scripts/module.lds.S +++ b/scripts/module.lds.S @@ -24,6 +24,30 @@ SECTIONS { .init_array 0 : ALIGN(8) { *(SORT(.init_array.*)) *(.init_array) } __jump_table 0 : ALIGN(8) { KEEP(*(__jump_table)) } + + __patchable_function_entries : { *(__patchable_function_entries) } + + /* + * With CONFIG_LTO_CLANG, LLD always enables -fdata-sections and + * -ffunction-sections, which increases the size of the final module. + * Merge the split sections in the final binary. + */ + .bss : { + *(.bss .bss.[0-9a-zA-Z_]*) + *(.bss..L*) + } + + .data : { + *(.data .data.[0-9a-zA-Z_]*) + *(.data..L*) + } + + .rodata : { + *(.rodata .rodata.[0-9a-zA-Z_]*) + *(.rodata..L*) + } + + .text : { *(.text .text.[0-9a-zA-Z_]*) } } /* bring in arch-specific sections */ -- GitLab