[PATCH] arm64: Add user stacktrace support

[Mark Rutland]

On Mon, Nov 20, 2023 at 02:29:23PM +0000, Mark Rutland wrote:
> On Sat, Nov 18, 2023 at 09:45:04PM +0800, qiwuchen55 at gmail.com wrote:
> > From: chenqiwu <qiwu.chen at transsion.com>

> > 2. Add arch_stack_walk_user() implementation to support userstacktrace transsionce option.
> 
> What is this 'userstacktrace transsionce option' ?

Sorry, I evidently corrupted the mail at my end; "transsionce" was "trace" in
the original mail, which matches the ftrace output below.

Please ignore this specific comment; my other concerns still apply.

> > A example test about the output format of ftrace userstacktrace as shown below:
> >     bash-489     [000] .....  2167.660775: sched_process_fork: comm=bash pid=489 child_comm=bash child_pid=596
> >     bash-489     [000] .....  2167.660787: <user stack trace>
> >  => /lib/aarch64-linux-gnu/libc-2.32.so[+0xa76d8]
> >  => /bin/bash[+0x5f354]
> >  => /bin/bash[+0x4876c]
> >  => /bin/bash[+0x4aec4]
> >  => /bin/bash[+0x4da48]
> >  => /bin/bash[+0x4b710]
> >  => /bin/bash[+0x4c31c]
> >  => /bin/bash[+0x339b0]

Thanks,
Mark.