Can't comment, my understanding of mm/ is not enough these days.
Just one question...
On 02/17, Tong Tiangen wrote:
>
> Fixes: 7396fa818d62 ("uprobes/core: Make background page replacement logic account for rss_stat counters")
> Fixes: 2b1444983508 ("uprobes, mm, x86: Add the ability to install and remove uprobes breakpoints")
Are you sure this logic was wrong from the very beginning? Just curious.
Oleg.
> Signed-off-by: Tong Tiangen <tongtiangen@xxxxxxxxxx>
> ---
> kernel/events/uprobes.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
> index 46ddf3a2334d..ff5694acfa68 100644
> --- a/kernel/events/uprobes.c
> +++ b/kernel/events/uprobes.c
> @@ -213,7 +213,8 @@ static int __replace_page(struct vm_area_struct *vma, unsigned long addr,
> dec_mm_counter(mm, MM_ANONPAGES);
>
> if (!folio_test_anon(old_folio)) {
> - dec_mm_counter(mm, mm_counter_file(old_folio));
> + if (!is_zero_folio(old_folio))
> + dec_mm_counter(mm, mm_counter_file(old_folio));
> inc_mm_counter(mm, MM_ANONPAGES);
> }
>
> @@ -227,7 +228,8 @@ static int __replace_page(struct vm_area_struct *vma, unsigned long addr,
> if (!folio_mapped(old_folio))
> folio_free_swap(old_folio);
> page_vma_mapped_walk_done(&pvmw);
> - folio_put(old_folio);
> + if (!is_zero_folio(old_folio))
> + folio_put(old_folio);
>
> err = 0;
> unlock:
> --
> 2.25.1
>
