Re: [PATCH v2 2/3] mm, page_owner: Add page_owner_stacks file to print out only stacks and their counter

[Marco Elver]

On Mon, Sep 05, 2022 at 02:57PM +0200, Marco Elver wrote:
[...]
> > +{
> > +	int i = *pos, ret = 0;
> > +	struct stack_record **stacks, *stack;
> > +	static struct stack_record *last = NULL;
> > +	unsigned long stack_table_entries = stack_hash_mask + 1;
> > +
> > +	/* Continue from the last stack if we have one */
> > +	if (last) {
> > +		stack = last->next;
> 
> This is dead code?

Oof, I just noticed that 'last' is static. Please avoid that, because
it'll make this interface really tricky to use safely. I still don't
quite understand why it needs to do this, and a kernel-doc comment would
make this clearer.