From: Frederic Weisbecker Date: Wed, 12 Nov 2008 21:49:23 +0000 (+0100) Subject: tracing/function-return-tracer: call prepare_ftrace_return by registers X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=1dc1c6adf38bc5799d1594681645ced40ced4b6b;p=linux-beck.git 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 Signed-off-by: Ingo Molnar --- 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 diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c index 1db0e121a3e7..fe832738e1e2 100644 --- a/arch/x86/kernel/ftrace.c +++ b/arch/x86/kernel/ftrace.c @@ -95,7 +95,6 @@ unsigned long ftrace_return_to_handler(void) * Hook the return address and push it in the stack of return addrs * in current thread info. */ -asmlinkage void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr) { unsigned long old;