X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=kernel%2Farch%2Fx86%2Fkernel%2Fmcount_64.S;fp=kernel%2Farch%2Fx86%2Fkernel%2Fmcount_64.S;h=87e1762e2bca74a3f22004d09d9069d72b41b62b;hb=e09b41010ba33a20a87472ee821fa407a5b8da36;hp=94ea120fa21ff7a9de85cc123054e9d2133b2305;hpb=f93b97fd65072de626c074dbe099a1fff05ce060;p=kvmfornfv.git

diff --git a/kernel/arch/x86/kernel/mcount_64.S b/kernel/arch/x86/kernel/mcount_64.S
index 94ea120fa..87e1762e2 100644
--- a/kernel/arch/x86/kernel/mcount_64.S
+++ b/kernel/arch/x86/kernel/mcount_64.S
@@ -278,6 +278,12 @@ trace:
 	/* save_mcount_regs fills in first two parameters */
 	save_mcount_regs
 
+	/*
+	 * When DYNAMIC_FTRACE is not defined, ARCH_SUPPORTS_FTRACE_OPS is not
+	 * set (see include/asm/ftrace.h and include/linux/ftrace.h).  Only the
+	 * ip and parent ip are used and the list function is called when
+	 * function tracing is enabled.
+	 */
 	call   *ftrace_trace_function
 
 	restore_mcount_regs