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Date: Tue, 21 Aug 2012 08:03:43 -0700 From: tip-bot for Uros Bizjak <ubizjak@...il.com> To: linux-tip-commits@...r.kernel.org Cc: linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org, masami.hiramatsu.pt@...achi.com, rostedt@...dmis.org, tglx@...utronix.de, ubizjak@...il.com Subject: [tip:perf/core] ftrace/x86_32: Simplify parameter setup for ftrace_regs_caller Commit-ID: e4ea3f6b1bf3d489674a3660db652636e50186f9 Gitweb: http://git.kernel.org/tip/e4ea3f6b1bf3d489674a3660db652636e50186f9 Author: Uros Bizjak <ubizjak@...il.com> AuthorDate: Thu, 19 Jul 2012 13:04:47 -0400 Committer: Steven Rostedt <rostedt@...dmis.org> CommitDate: Tue, 31 Jul 2012 10:29:34 -0400 ftrace/x86_32: Simplify parameter setup for ftrace_regs_caller 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.camel@gandalf.stny.rr.com Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com> Signed-off-by: Uros Bizjak <ubizjak@...il.com> Signed-off-by: Steven Rostedt <rostedt@...dmis.org> --- arch/x86/kernel/entry_32.S | 5 ++--- 1 files 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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