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authorVasily Gorbik <gor@linux.ibm.com>2018-08-06 16:17:46 +0300
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2018-08-16 05:38:38 +0300
commit2f4df0017baedd535254d987c6b10f855f1fb11f (patch)
treec035a8d2357ee4c54b584a3ba4153d4673fa057f
parent07d0408120216b60625c9a5b8012d1c3a907984d (diff)
downloadlinux-2f4df0017baedd535254d987c6b10f855f1fb11f.tar.xz
tracing: Add -mcount-nop option support
-mcount-nop gcc option generates the calls to the profiling functions as nops which allows to avoid patching mcount jump with NOP instructions initially. -mcount-nop gcc option will be activated if platform selects HAVE_NOP_MCOUNT and gcc actually supports it. In addition to that CC_USING_NOP_MCOUNT is defined and could be used by architectures to adapt ftrace patching behavior. Link: http://lkml.kernel.org/r/patch-3.thread-aa7b8d.git-e02ed2dc082b.your-ad-here.call-01533557518-ext-9465@work.hours Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
-rw-r--r--Makefile6
-rw-r--r--kernel/trace/Kconfig5
-rw-r--r--kernel/trace/ftrace.c2
3 files changed, 13 insertions, 0 deletions
diff --git a/Makefile b/Makefile
index 2c92ebf59a34..c5b0cd7f3c2a 100644
--- a/Makefile
+++ b/Makefile
@@ -749,6 +749,12 @@ ifdef CONFIG_FTRACE_MCOUNT_RECORD
CC_FLAGS_FTRACE += -mrecord-mcount
export CC_USING_RECORD_MCOUNT := 1
endif
+ ifdef CONFIG_HAVE_NOP_MCOUNT
+ ifeq ($(call cc-option-yn, -mnop-mcount),y)
+ CC_FLAGS_FTRACE += -mnop-mcount
+ CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
+ endif
+ endif
endif
ifdef CONFIG_HAVE_FENTRY
ifeq ($(call cc-option-yn, -mfentry),y)
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 036cec1fcd24..fd6754b88f87 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -47,6 +47,11 @@ config HAVE_FENTRY
help
Arch supports the gcc options -pg with -mfentry
+config HAVE_NOP_MCOUNT
+ bool
+ help
+ Arch supports the gcc options -pg with -mrecord-mcount and -nop-mcount
+
config HAVE_C_RECORDMCOUNT
bool
help
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 48b5b466ec7a..468e8527e979 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -2950,12 +2950,14 @@ static int ftrace_update_code(struct module *mod, struct ftrace_page *new_pgs)
p = &pg->records[i];
p->flags = rec_flags;
+#ifndef CC_USING_NOP_MCOUNT
/*
* Do the initial record conversion from mcount jump
* to the NOP instructions.
*/
if (!ftrace_code_disable(mod, p))
break;
+#endif
update_cnt++;
}