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authorSteven Rostedt <rostedt@goodmis.org>2008-11-26 00:16:24 -0500
committerIngo Molnar <mingo@elte.hu>2008-11-26 06:52:54 +0100
commit5a45cfe1c64862e8cd3b0d79d7c4ba71c3118915 (patch)
tree0a7edf3a9dc88d74b7c7053445ac8aff033a75fa /arch/x86/kernel/entry_32.S
parentdf4fc31558dd2a3a30292ddb3a64c2a5befcec73 (diff)
ftrace: use code patching for ftrace graph tracer
Impact: more efficient code for ftrace graph tracer This patch uses the dynamic patching, when available, to patch the function graph code into the kernel. This patch will ease the way for letting both function tracing and function graph tracing run together. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/entry_32.S')
-rw-r--r--arch/x86/kernel/entry_32.S5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S
index 7def9fd5c1e..958af86186c 100644
--- a/arch/x86/kernel/entry_32.S
+++ b/arch/x86/kernel/entry_32.S
@@ -1174,6 +1174,11 @@ ftrace_call:
popl %edx
popl %ecx
popl %eax
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+.globl ftrace_graph_call
+ftrace_graph_call:
+ jmp ftrace_stub
+#endif
.globl ftrace_stub
ftrace_stub: