From: Uros Bizjak <ubiz...@gmail.com> The final position of the stack after saving regs and setting up the parameters for ftrace_regs_call, is the position of the pt_regs needed for the 4th parameter. Instead of saving it into a temporary reg and pushing the reg, simply push the stack pointer.
Link: http://lkml.kernel.org/r/1342702344.12353.16.ca...@gandalf.stny.rr.com Signed-off-by: Uros Bizjak <ubiz...@gmail.com> Signed-off-by: Steven Rostedt <rost...@goodmis.org> --- arch/x86/kernel/entry_32.S | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S index 46caa56..4dc3017 100644 --- a/arch/x86/kernel/entry_32.S +++ b/arch/x86/kernel/entry_32.S @@ -1169,10 +1169,9 @@ ENTRY(ftrace_regs_caller) movl $__KERNEL_CS,13*4(%esp) movl 12*4(%esp), %eax /* Load ip (1st parameter) */ - movl 0x4(%ebp), %edx /* Load parent ip (2cd parameter) */ - lea (%esp), %ecx - pushl %ecx /* Save pt_regs as 4th parameter */ + movl 0x4(%ebp), %edx /* Load parent ip (2nd parameter) */ leal function_trace_op, %ecx /* Save ftrace_pos in 3rd parameter */ + pushl %esp /* Save pt_regs as 4th parameter */ GLOBAL(ftrace_regs_call) call ftrace_stub -- 1.7.10.4
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