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authorPaul Burton <paul.burton@mips.com>2018-11-21 21:56:36 +0000
committerPaul Burton <paul.burton@mips.com>2018-11-21 15:36:49 -0800
commitc0436b503591f927f326457a588c461881260276 (patch)
tree805fdef33156e14df943d5bfad3aa0deb2b43cd5 /arch/mips/Kconfig
parentMIPS: OCTEON: cvmx-ciu2-defs.h: delete unused unions (diff)
downloadlinux-dev-c0436b503591f927f326457a588c461881260276.tar.xz
linux-dev-c0436b503591f927f326457a588c461881260276.zip
MIPS: Enable dead code elimination
Select CONFIG_HAVE_LD_DEAD_CODE_DATA_ELIMINATION for MIPS, allowing the user to enable dead code elimination. In order for this to work, ensure that we keep the data bus exception table & the machine list by annotating them with KEEP. This shrinks both 32r2el_defconfig & 64r6el_defconfig builds by ~6%, as shown by numbers from scripts/bloat-o-meter: | 32r2el_defconfig | 64r6el_defconfig --------|------------------|------------------ No DCE | 8919864 | 8286307 DCE | 8338988 (-6.51%) | 7741808 (-6.57%) Signed-off-by: Paul Burton <paul.burton@mips.com> Patchwork: https://patchwork.linux-mips.org/patch/21187/ Cc: linux-mips@linux-mips.org
Diffstat (limited to '')
-rw-r--r--arch/mips/Kconfig1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index e83a8cce41e9..e49b5a0c8585 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -63,6 +63,7 @@ config MIPS
select HAVE_IRQ_TIME_ACCOUNTING
select HAVE_KPROBES
select HAVE_KRETPROBES
+ select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
select HAVE_MEMBLOCK_NODE_MAP
select HAVE_MOD_ARCH_SPECIFIC
select HAVE_NMI