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authorSami Tolvanen <samitolvanen@google.com>2020-12-11 21:46:22 +0300
committerKees Cook <keescook@chromium.org>2021-01-14 19:21:08 +0300
commitdd2776222abb9893e5b5c237a2c8c880d8854cee (patch)
tree479759a1b7e3330906346ec9f4b25b2a79d47c5d /scripts/module.lds.S
parent22d429e75f24d114d99223389d6ba7047e952e32 (diff)
downloadlinux-dd2776222abb9893e5b5c237a2c8c880d8854cee.tar.xz
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.S24
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 */