On Wed, Jul 17, 2024 at 12:36 PM Vlastimil Babka <vbabka@xxxxxxx> wrote:
>
> On 7/17/24 8:12 PM, Suren Baghdasaryan wrote:
> > Outline and export free_reserved_page() because modules use it and it
> > in turn uses page_ext_{get|put} which should not be exported. The same
> > result could be obtained by outlining {get|put}_page_tag_ref() but that
> > would have higher performance impact as these functions are used in
> > more performance critical paths.
> >
> > Fixes: dcfe378c81f7 ("lib: introduce support for page allocation tagging")
> > Reported-by: kernel test robot <lkp@xxxxxxxxx>
> > Closes: https://lore.kernel.org/oe-kbuild-all/202407080044.DWMC9N9I-lkp@xxxxxxxxx/
> > Suggested-by: Christoph Hellwig <hch@xxxxxxxxxxxxx>
> > Suggested-by: Vlastimil Babka <vbabka@xxxxxxx>
> > Signed-off-by: Suren Baghdasaryan <surenb@xxxxxxxxxx>
>
> Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
>
> Are these two patches now stable@ material as 6.10 build is broken on ppc64
> with alloc taging enabled?
I tested them with that specific configuration mentioned in the bug
report and with several usual ones I use.
Yeah, I guess from now on all such fixes should have
Cc: stable@xxxxxxxxxxxxxxx # v6.10
>
> > ---
> > Changes since v1 [1]
> > - Outlined and exported free_reserved_page() in place of {get|put}_page_tag_ref,
> > per Vlastimil Babka
> >
> > [1] https://lore.kernel.org/all/20240717011631.2150066-2-surenb@xxxxxxxxxx/
> >
> > include/linux/mm.h | 16 +---------------
> > mm/page_alloc.c | 17 +++++++++++++++++
> > 2 files changed, 18 insertions(+), 15 deletions(-)
> >
> > diff --git a/include/linux/mm.h b/include/linux/mm.h
> > index eb7c96d24ac0..b58bad248eef 100644
> > --- a/include/linux/mm.h
> > +++ b/include/linux/mm.h
> > @@ -3177,21 +3177,7 @@ extern void reserve_bootmem_region(phys_addr_t start,
> > phys_addr_t end, int nid);
> >
> > /* Free the reserved page into the buddy system, so it gets managed. */
> > -static inline void free_reserved_page(struct page *page)
> > -{
> > - if (mem_alloc_profiling_enabled()) {
> > - union codetag_ref *ref = get_page_tag_ref(page);
> > -
> > - if (ref) {
> > - set_codetag_empty(ref);
> > - put_page_tag_ref(ref);
> > - }
> > - }
> > - ClearPageReserved(page);
> > - init_page_count(page);
> > - __free_page(page);
> > - adjust_managed_page_count(page, 1);
> > -}
> > +void free_reserved_page(struct page *page);
> > #define free_highmem_page(page) free_reserved_page(page)
> >
> > static inline void mark_page_reserved(struct page *page)
> > diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> > index 9ecf99190ea2..7d2fa9f5e750 100644
> > --- a/mm/page_alloc.c
> > +++ b/mm/page_alloc.c
> > @@ -5805,6 +5805,23 @@ unsigned long free_reserved_area(void *start, void *end, int poison, const char
> > return pages;
> > }
> >
> > +void free_reserved_page(struct page *page)
> > +{
> > + if (mem_alloc_profiling_enabled()) {
> > + union codetag_ref *ref = get_page_tag_ref(page);
> > +
> > + if (ref) {
> > + set_codetag_empty(ref);
> > + put_page_tag_ref(ref);
> > + }
> > + }
> > + ClearPageReserved(page);
> > + init_page_count(page);
> > + __free_page(page);
> > + adjust_managed_page_count(page, 1);
> > +}
> > +EXPORT_SYMBOL(free_reserved_page);
> > +
> > static int page_alloc_cpu_dead(unsigned int cpu)
> > {
> > struct zone *zone;
>
