ftrace: have function graph use mcount caller address

Impact: consistency change for function graph

This patch makes function graph record the mcount caller address
the same way the function tracer does.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S
index 958af86..826682a 100644 (file)
--- a/arch/x86/kernel/entry_32.S
+++ b/arch/x86/kernel/entry_32.S
@@ -1230,6 +1230,7 @@ ENTRY(ftrace_graph_caller)
        pushl %edx
        movl 0xc(%esp), %edx
        lea 0x4(%ebp), %eax
+       subl $MCOUNT_INSN_SIZE, %edx
        call prepare_ftrace_return
        popl %edx
        popl %ecx

diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index 2aa0526..9060ba6 100644 (file)
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -173,6 +173,7 @@ ENTRY(ftrace_graph_caller)
 
        leaq 8(%rbp), %rdi
        movq 0x38(%rsp), %rsi
+       subq $MCOUNT_INSN_SIZE, %rsi
 
        call    prepare_ftrace_return