Enable CONFIG_THIN_ARCHIVES & CONFIG_LD_DEAD_CODE_DATA_ELIMINATION for
MIPS, ensuring that we keep the data bus exception table & the machine
list which would be discarded without marking them with KEEP.
This shrinks a typical generic kernel build with drivers enabled for
Boston, Ci40 & SEAD-3 by around 5%, or ~450kb. As reported by
bloat-o-meter:
add/remove: 0/3028 grow/shrink: 1/14 up/down: 18/-457362 (-457344)
...
Total: Before=9001030, After=8543686, chg -5.08%
Signed-off-by: Paul Burton <paul.burton@xxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxx
Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Cc: Nicholas Piggin <npiggin@xxxxxxxxx>
---
arch/mips/Kconfig | 2 ++
arch/mips/kernel/vmlinux.lds.S | 4 ++--
2 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index b3c5bde..8557667 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -66,6 +66,8 @@ config MIPS
select HAVE_EXIT_THREAD
select HAVE_REGS_AND_STACK_ACCESS_API
select HAVE_ARCH_HARDENED_USERCOPY
+ select THIN_ARCHIVES
+ select LD_DEAD_CODE_DATA_ELIMINATION
menu "Machine selection"
diff --git a/arch/mips/kernel/vmlinux.lds.S b/arch/mips/kernel/vmlinux.lds.S
index d1f5401..a43ba2a 100644
--- a/arch/mips/kernel/vmlinux.lds.S
+++ b/arch/mips/kernel/vmlinux.lds.S
@@ -72,7 +72,7 @@ SECTIONS
/* Exception table for data bus errors */
__dbe_table : {
__start___dbe_table = .;
- *(__dbe_table)
+ KEEP(*(__dbe_table))
__stop___dbe_table = .;
}
@@ -122,7 +122,7 @@ SECTIONS
. = ALIGN(4);
.mips.machines.init : AT(ADDR(.mips.machines.init) - LOAD_OFFSET) {
__mips_machines_start = .;
- *(.mips.machines.init)
+ KEEP(*(.mips.machines.init))
__mips_machines_end = .;
}
--
2.10.0
