Re: [PATCH 4/6] mm/page_io: rename bio_associate_blkg_from_page()

[Tal Zussman]

On 8/7/26 2:56 PM, Matthew Wilcox wrote:
> On Thu, Aug 06, 2026 at 06:55:36PM -0400, Tal Zussman wrote:
>> This function takes a folio. Rename it to
>> bio_associate_blkg_from_folio() accordingly. While at it, convert the
>> macro in the !CONFIG_MEMCG || !CONFIG_BLK_CGROUP case to a function.
>> 
>> Signed-off-by: Tal Zussman <tz2294@xxxxxxxxxxxx>
> 
> Reviewed-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
> 
>> -static void bio_associate_blkg_from_page(struct bio *bio, struct folio *folio)
>> +static void bio_associate_blkg_from_folio(struct bio *bio, struct folio *folio)
> 
> It's s shame this isn't const-qualified (after all, we don't modify the folio).
> That needs folio_memcg_charged() to take a const folio pointer, which it
> could.  And folio_memcg_blkg_css() and folio_memcg().  That's a followup
> patch though.
> 

I had the same thought when looking at this and went all the way down the
callchain to dump_page(). I didn't want to flood the list with patches, but
happy to send a couple follow-up patches once this is in mm-new.