tracing/function-return-tracer: call prepare_ftrace_return by registers

Impact: Optimize a bit the function return tracer

This patch changes the calling convention of prepare_ftrace_return to
pass its arguments by register. This will optimize it a bit and
prepare it to support dynamic tracing.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 1 insertions, 4 deletions

diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S
index 9a0ac85946db..f97621149839 100644
--- a/arch/x86/kernel/entry_32.S
+++ b/arch/x86/kernel/entry_32.S
@@ -1217,12 +1217,9 @@ trace_return:
         pushl %eax
         pushl %ecx
         pushl %edx
-        movl 0xc(%esp), %eax
-        pushl %eax
+        movl 0xc(%esp), %edx
         lea 0x4(%ebp), %eax
-        pushl %eax
         call prepare_ftrace_return
-        addl $8, %esp
         popl %edx
         popl %ecx
         popl %eax