ftrace/x86: Load ftrace_ops in parameter not the variable holding it

Function tracing callbacks expect to have the ftrace_ops that registered it
passed to them, not the address of the variable that holds the ftrace_ops
that registered it.

Use a mov instead of a lea to store the ftrace_ops into the parameter
of the function tracing callback.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Link: http://lkml.kernel.org/r/20131113152004.459787f9@gandalf.local.home
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Cc: <stable@vger.kernel.org> # v3.8+

diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S
index 51e2988..a2a4f46 100644 (file)
--- a/arch/x86/kernel/entry_32.S
+++ b/arch/x86/kernel/entry_32.S
@@ -1082,7 +1082,7 @@ ENTRY(ftrace_caller)
        pushl $0        /* Pass NULL as regs pointer */
        movl 4*4(%esp), %eax
        movl 0x4(%ebp), %edx
-       leal function_trace_op, %ecx
+       movl function_trace_op, %ecx
        subl $MCOUNT_INSN_SIZE, %eax
 
 .globl ftrace_call
@@ -1140,7 +1140,7 @@ ENTRY(ftrace_regs_caller)
        movl 12*4(%esp), %eax   /* Load ip (1st parameter) */
        subl $MCOUNT_INSN_SIZE, %eax    /* Adjust ip */
        movl 0x4(%ebp), %edx    /* Load parent ip (2nd parameter) */
-       leal function_trace_op, %ecx /* Save ftrace_pos in 3rd parameter */
+       movl function_trace_op, %ecx /* Save ftrace_pos in 3rd parameter */
        pushl %esp              /* Save pt_regs as 4th parameter */
 
 GLOBAL(ftrace_regs_call)

diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index e21b078..1e96c36 100644 (file)
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -88,7 +88,7 @@ END(function_hook)
        MCOUNT_SAVE_FRAME \skip
 
        /* Load the ftrace_ops into the 3rd parameter */
-       leaq function_trace_op, %rdx
+       movq function_trace_op(%rip), %rdx
 
        /* Load ip into the first parameter */
        movq RIP(%rsp), %rdi