[PATCH 5/5] ftrace: have function graph use mcount caller address

Steven Rostedt
2008-12-02T20:34:51Z

[-- Attachment #1: 0005-ftrace-have-function-graph-use-mcount-caller-addres.patch --]
[-- Type: text/plain, Size: 1073 bytes --]

From: Steven Rostedt <srostedt@redhat.com>

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>
---
arch/x86/kernel/entry_32.S | 1 +
arch/x86/kernel/entry_64.S | 1 +
2 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S
index f484e9a..3497321 100644
--- a/arch/x86/kernel/entry_32.S
+++ b/arch/x86/kernel/entry_32.S
@@ -1027,6 +1027,7 @@ 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 c433d86..47aa5f0 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -172,6 +172,7 @@ ENTRY(ftrace_graph_caller)

leaq 8(%rbp), %rdi
movq 0x38(%rsp), %rsi
+ subq $MCOUNT_INSN_SIZE, %rsi

call prepare_ftrace_return

--
1.5.6.5

--