diff options
| author | Sami Tolvanen <samitolvanen@google.com> | 2020-12-11 10:46:22 -0800 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2021-01-14 08:21:08 -0800 |
| commit | dd2776222abb9893e5b5c237a2c8c880d8854cee (patch) | |
| tree | 479759a1b7e3330906346ec9f4b25b2a79d47c5d /scripts/module.lds.S | |
| parent | 22d429e75f24d114d99223389d6ba7047e952e32 (diff) | |
| download | lwn-dd2776222abb9893e5b5c237a2c8c880d8854cee.tar.gz lwn-dd2776222abb9893e5b5c237a2c8c880d8854cee.zip | |
kbuild: lto: merge module sections
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 <ndesaulniers@google.com>
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20201211184633.3213045-6-samitolvanen@google.com
Diffstat (limited to 'scripts/module.lds.S')
| -rw-r--r-- | scripts/module.lds.S | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/scripts/module.lds.S b/scripts/module.lds.S index 69b9b71a6a47..18d5b8423635 100644 --- a/scripts/module.lds.S +++ b/scripts/module.lds.S @@ -23,6 +23,30 @@ 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 */ |