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 egs6RKAH 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the end of the function. Fix these by replacing them with >> "ret =3D ; goto out;". > > I guess the xas_destroy() there will be a no-op in these cases! Right. And there is no memory leak, since xas_split_alloc() does the memory allocation and code after it all never returns directly, letting xas_destroy() do its job. > > Good spot, as David said, maybe one for stable then... not sure if necess= ary for > statistical stuff though? > > But at the same time, maybe users will be misled if these are incorrect? > > Has this bug been around since the beginning? Be curious to know if that'= s the > case or if it was introduced somewhere along the line? It started from commit 59807685a7e7 ("mm, THP, swap: support splitting THP for THP swap out=E2=80=9D) back in 2017 and more inconsistent= code was added later. Unless someone relies on split stats heavily, I am not sure we need to back= port it. > >> >> Signed-off-by: Zi Yan > > LGTM, so: > > Reviewed-by: Lorenzo Stoakes Thanks. > >> --- >> mm/huge_memory.c | 14 +++++++++----- >> 1 file changed, 9 insertions(+), 5 deletions(-) >> >> diff --git a/mm/huge_memory.c b/mm/huge_memory.c >> index ebc3ba0907fd..a42c4f29ce4f 100644 >> --- a/mm/huge_memory.c >> +++ b/mm/huge_memory.c >> @@ -3954,16 +3954,20 @@ static int __folio_split(struct folio *folio, un= signed int new_order, >> VM_WARN_ON_ONCE_FOLIO(!folio_test_locked(folio), folio); >> VM_WARN_ON_ONCE_FOLIO(!folio_test_large(folio), folio); >> >> - if (folio !=3D page_folio(split_at) || folio !=3D page_folio(lock_at)) >> - return -EINVAL; >> + if (folio !=3D page_folio(split_at) || folio !=3D page_folio(lock_at))= { >> + ret =3D -EINVAL; >> + goto out; >> + } >> >> - if (new_order >=3D old_order) >> - return -EINVAL; >> + if (new_order >=3D old_order) { >> + ret =3D -EINVAL; >> + goto out; >> + } >> >> ret =3D folio_check_splittable(folio, new_order, split_type, >> /* warn =3D */ true); >> if (ret) >> - return ret; >> + goto out; >> >> if (is_anon) { >> /* >> -- >> 2.51.0 >> > > Cheers, Lorenzo Best Regards, Yan, Zi