On Fri, Oct 21, 2022 at 04:46:11PM +0800, Kefeng Wang wrote:
> Check mf_result in action_result(), only return 0 when MF_RECOVERED,
> or return -EBUSY, which will simplify code a bit.
>
> Signed-off-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Thanks for the cleanup, Kefeng.
I basically agree with the change. I have one comment below ...
> ---
> mm/memory-failure.c | 42 ++++++++++++++++--------------------------
> 1 file changed, 16 insertions(+), 26 deletions(-)
>
> diff --git a/mm/memory-failure.c b/mm/memory-failure.c
> index ca0199d0f79d..3f469e2da047 100644
> --- a/mm/memory-failure.c
> +++ b/mm/memory-failure.c
> @@ -1182,14 +1182,16 @@ static struct page_state error_states[] = {
> * "Dirty/Clean" indication is not 100% accurate due to the possibility of
> * setting PG_dirty outside page lock. See also comment above set_page_dirty().
> */
> -static void action_result(unsigned long pfn, enum mf_action_page_type type,
> - enum mf_result result)
> +static int action_result(unsigned long pfn, enum mf_action_page_type type,
> + enum mf_result result)
> {
> trace_memory_failure_event(pfn, type, result);
>
> num_poisoned_pages_inc();
> pr_err("%#lx: recovery action for %s: %s\n",
> pfn, action_page_types[type], action_name[result]);
> +
> + return result == MF_RECOVERED ? 0 : -EBUSY;
I think that MF_DELAYED may be considered as success (returning 0), then
page_action() can be cleaned up a little more (like below?)
static int page_action(struct page_state *ps, struct page *p,
unsigned long pfn)
{
int result;
/* page p should be unlocked after returning from ps->action(). */
result = ps->action(ps, p);
/* Could do more checks here if page looks ok */
/*
* Could adjust zone counters here to correct for the missing page.
*/
return action_result(pfn, ps->type, result);
}
Existing direct callers (I mean action_result() called from other than
page_action()) are never called with result==MF_DELAYED, so this change
should not affect them.
Does it make sense for you?
Thanks,
Naoya Horiguchi
