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authorRalf Baechle <ralf@linux-mips.org>2010-10-29 19:08:24 +0100
committerRalf Baechle <ralf@linux-mips.org>2010-10-29 19:08:24 +0100
commit7837314d141c661c70bc13c5050694413ecfe14a (patch)
treede137b1d2945d2490bc1dcdf6d76eac6006f7ab0 /arch/mips/Makefile
parent18cb657ca1bafe635f368346a1676fb04c512edf (diff)
MIPS: Get rid of branches to .subsections.
It was a nice optimization - on paper at least. In practice it results in branches that may exceed the maximum legal range for a branch. We can fight that problem with -ffunction-sections but -ffunction-sections again is incompatible with -pg used by the function tracer. By rewriting the loop around all simple LL/SC blocks to C we reduce the amount of inline assembler and at the same time allow GCC to often fill the branch delay slots with something sensible or whatever else clever optimization it may have up in its sleeve. With this optimization gone we also no longer need -ffunction-sections, so drop it. This optimization was originally introduced in 2.6.21, commit 5999eca25c1fd4b9b9aca7833b04d10fe4bc877d (linux-mips.org) rsp. f65e4fa8e0c6022ad58dc88d1b11b12589ed7f9f (kernel.org). Original fix for the issues which caused me to pull this optimization by Paul Gortmaker <paul.gortmaker@windriver.com>. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/Makefile')
-rw-r--r--arch/mips/Makefile3
1 files changed, 0 insertions, 3 deletions
diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index f4a4b663ebb3..1a81240102c5 100644
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -48,9 +48,6 @@ ifneq ($(SUBARCH),$(ARCH))
endif
endif
-ifndef CONFIG_FUNCTION_TRACER
-cflags-y := -ffunction-sections
-endif
ifdef CONFIG_FUNCTION_GRAPH_TRACER
ifndef KBUILD_MCOUNT_RA_ADDRESS
ifeq ($(call cc-option-yn,-mmcount-ra-address), y)

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