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authorChris Zankel <chris@zankel.net>2012-11-13 18:16:36 -0500
committerChris Zankel <chris@zankel.net>2012-12-19 00:10:20 -0500
commit6550162200b40d1e725167f8a617255c42b57552 (patch)
tree072a99de3ab75fe899254bf75d1a704d91f8916f /arch/xtensa
parent02b25d811f949fc70badd6535dfaf13a3c5decf9 (diff)
xtensa: add config option to disable linker relaxation
The default linker behavior is to optimize identical literal values and remove unnecessary overhead from assembler-generated "longcall" sequences to reduce code size. Provide an option to disable this behavior to improve compile time. Signed-off-by: Chris Zankel <chris@zankel.net>
Diffstat (limited to 'arch/xtensa')
-rw-r--r--arch/xtensa/Kconfig.debug13
-rw-r--r--arch/xtensa/Makefile4
2 files changed, 15 insertions, 2 deletions
diff --git a/arch/xtensa/Kconfig.debug b/arch/xtensa/Kconfig.debug
index 11c585295dd7..be5fb4c6243f 100644
--- a/arch/xtensa/Kconfig.debug
+++ b/arch/xtensa/Kconfig.debug
@@ -2,6 +2,15 @@ menu "Kernel hacking"
2 2
3source "lib/Kconfig.debug" 3source "lib/Kconfig.debug"
4 4
5endmenu 5config LD_NO_RELAX
6 6 bool "Disable linker relaxation"
7 default n
8 help
9 Enable this function to disable link-time optimizations.
10 The default linker behavior is to combine identical literal
11 values to reduce code size and remove unnecessary overhead from
12 assembler-generated 'longcall' sequences.
13 Enabling this option improves the link time but increases the
14 code size, and possibly execution time.
7 15
16endmenu
diff --git a/arch/xtensa/Makefile b/arch/xtensa/Makefile
index bb5ba61723f7..ab63c9beb930 100644
--- a/arch/xtensa/Makefile
+++ b/arch/xtensa/Makefile
@@ -49,6 +49,10 @@ KBUILD_CFLAGS += -pipe -mlongcalls
49 49
50KBUILD_CFLAGS += $(call cc-option,-mforce-no-pic,) 50KBUILD_CFLAGS += $(call cc-option,-mforce-no-pic,)
51 51
52ifneq ($(CONFIG_LD_NO_RELAX),)
53LDFLAGS := --no-relax
54endif
55
52vardirs := $(patsubst %,arch/xtensa/variants/%/,$(variant-y)) 56vardirs := $(patsubst %,arch/xtensa/variants/%/,$(variant-y))
53plfdirs := $(patsubst %,arch/xtensa/platforms/%/,$(platform-y)) 57plfdirs := $(patsubst %,arch/xtensa/platforms/%/,$(platform-y))
54 58