Re: [PATCH] maple_tree: fix tracepoint string pointers

[Liam R. Howlett]

* Martin Kaiser <martin@xxxxxxxxx> [251031 06:23]:
> Thus wrote Andrew Morton (akpm@xxxxxxxxxxxxxxxxxxxx):
> 
> > > -	trace_ma_op(__func__, mas);
> > > +	trace_ma_op(TP_FCT, mas);
> 
> 
> > What could cause the storage for __func__ to disappear as you suggest?
> 
> I see your point. For __func__, the compiler generates a local symbol in
> .rodata that should always be accessible by its address.
> 
> One case that doesn't work without my patch would be trace-cmd record to save
> the binary ringbuffer and trace-cmd report to parse it in userspace. The
> address of __func__ can't be dereferenced from userspace but tracepoint_string
> will add an entry to /sys/kernel/tracing/printk_formats
> 


Thanks.

Is there some way to detect such things at compile?

Acked-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>