On Fri, 4 Dec 2015 10:18:38 +0800
Li Bin <huawei.li...@huawei.com> wrote:
> For ftrace on arm64, kstop_machine which is hugely disruptive
> to a running system is not needed to convert nops to ftrace calls
> or back, because that to be modified instrucions, that NOP, B or BL,
> are all safe instructions which called "concurrent modification
> and execution of instructions", that can be executed by one
> thread of execution as they are being modified by another thread
> of execution without requiring explicit synchronization.
>
> Signed-off-by: Li Bin <huawei.li...@huawei.com>
> ---
> arch/arm64/kernel/ftrace.c | 5 +++++
> 1 files changed, 5 insertions(+), 0 deletions(-)
>
> diff --git a/arch/arm64/kernel/ftrace.c b/arch/arm64/kernel/ftrace.c
> index c851be7..9669b33 100644
> --- a/arch/arm64/kernel/ftrace.c
> +++ b/arch/arm64/kernel/ftrace.c
> @@ -93,6 +93,11 @@ int ftrace_make_nop(struct module *mod, struct dyn_ftrace
> *rec,
> return ftrace_modify_code(pc, old, new, true);
> }
>
> +void arch_ftrace_update_code(int command)
> +{
> + ftrace_modify_all_code(command);
Hmm, I wonder why I haven't done this for powerpc. I probably should.
Anyway,
Reviewed-by: Steven Rostedt <rost...@goodmis.org>
If it is indeed safe not to do any special handling.
-- Steve
> +}
> +
> int __init ftrace_dyn_arch_init(void)
> {
> return 0;
--
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