On 08/20/2022 09:52 AM, Steven Rostedt wrote:
On Sat, 20 Aug 2022 09:38:21 +0800
Jinyang He <hejinyang@xxxxxxxxxxx> wrote:
I think we have implemented CONFIG_FTRACE_WITH_ARGS in dynamic ftrace
in the [Patch3/9].
Sorry, I must have missed it.
And there is still something left to do, Qing will do that.
But, for non dynamic ftrace, it is hardly to
implement it. Because the LoongArch compiler gcc treats mount as a
Don't bother implementing it for non-dynamic. I would just add a:
config HAVE_FTRACE_WITH_ARGS if DYNAMIC_FTRACE
and be done with it.
Yes, it is clear.
really call, like 'call _mcount(__builtin_return_address(0))'. That
means, they decrease stack, save args to callee saved regs and may
do some optimization before calling mcount. It is difficult to find the
original args and apply changes from tracers.
Right, there's no point in implementing it for non dynamic. Like I said,
non-dynamic is just a stepping stone for getting dynamic working. Once you
have dynamic working, it's up to you to throw out the non-dynamic. It's not
useful for anything other than porting to a new architecture or for
academic purposes.
Thanks for your detail answers.
Jinyang
