I'm running my ftrace tests on my PAsemi box with your patches and
things are not going so well.
Just this patch alone causes my first stress test to lock up, and
things don't go so well after that.
INFO: rcu_sched detected stalls on CPUs/tasks: {} (detected by 1, t=5253
jiffies, g=3603, c=3602, q=15)
INFO: Stall ended before state dump start
INFO: rcu_sched detected stalls on CPUs/tasks: {} (detected by 1, t=21008
jiffies, g=3603, c=3602, q=15)
INFO: Stall ended before state dump start
That's repeated and the system is basically useless.
-- Steve
On Wed, 17 Sep 2014 17:07:02 +1000
Anton Blanchard an...@samba.org wrote:
We added -mno-sched-epilog in commit 7563dc645853 (powerpc:
Work around gcc's -fno-omit-frame-pointer bug).
We shouldn't apply -fno-omit-frame-pointer on powerpc any more (it's
protected by CONFIG_FRAME_POINTER and CONFIG_SCHED_OMIT_FRAME_POINTER).
It's also an undocumented gcc option, so lets remove it.
Signed-off-by: Anton Blanchard an...@samba.org
---
arch/powerpc/Makefile| 5 -
arch/powerpc/kernel/Makefile | 12 ++--
arch/powerpc/platforms/powermac/Makefile | 2 +-
3 files changed, 7 insertions(+), 12 deletions(-)
diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index 132d9c6..c6f64e2 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -198,11 +198,6 @@ ifeq ($(CONFIG_6xx),y)
KBUILD_CFLAGS+= -mcpu=powerpc
endif
-# Work around a gcc code-gen bug with -fno-omit-frame-pointer.
-ifeq ($(CONFIG_FUNCTION_TRACER),y)
-KBUILD_CFLAGS+= -mno-sched-epilog
-endif
-
cpu-as-$(CONFIG_4xx) += -Wa,-m405
cpu-as-$(CONFIG_ALTIVEC) += -Wa,-maltivec
cpu-as-$(CONFIG_E200)+= -Wa,-me200
diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index 502cf69..e14bda6 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -17,14 +17,14 @@ endif
ifdef CONFIG_FUNCTION_TRACER
# Do not trace early boot code
-CFLAGS_REMOVE_cputable.o = -pg -mno-sched-epilog
-CFLAGS_REMOVE_prom_init.o = -pg -mno-sched-epilog
-CFLAGS_REMOVE_btext.o = -pg -mno-sched-epilog
-CFLAGS_REMOVE_prom.o = -pg -mno-sched-epilog
+CFLAGS_REMOVE_cputable.o = -pg
+CFLAGS_REMOVE_prom_init.o = -pg
+CFLAGS_REMOVE_btext.o = -pg
+CFLAGS_REMOVE_prom.o = -pg
# do not trace tracer code
-CFLAGS_REMOVE_ftrace.o = -pg -mno-sched-epilog
+CFLAGS_REMOVE_ftrace.o = -pg
# timers used by tracing
-CFLAGS_REMOVE_time.o = -pg -mno-sched-epilog
+CFLAGS_REMOVE_time.o = -pg
endif
obj-y:= cputable.o ptrace.o syscalls.o \
diff --git a/arch/powerpc/platforms/powermac/Makefile
b/arch/powerpc/platforms/powermac/Makefile
index 52c6ce1..e238872 100644
--- a/arch/powerpc/platforms/powermac/Makefile
+++ b/arch/powerpc/platforms/powermac/Makefile
@@ -2,7 +2,7 @@ CFLAGS_bootx_init.o += -fPIC
ifdef CONFIG_FUNCTION_TRACER
# Do not trace early boot code
-CFLAGS_REMOVE_bootx_init.o = -pg -mno-sched-epilog
+CFLAGS_REMOVE_bootx_init.o = -pg
endif
obj-y+= pic.o setup.o time.o feature.o pci.o
\
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