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SubjectRe: [PATCH 3/6] mm/gup: make __gup_longterm_locked common
On Wed, Dec 2, 2020 at 11:33 AM Ira Weiny <ira.weiny@intel.com> wrote:
>
> On Wed, Dec 02, 2020 at 08:31:45AM -0800, 'Ira Weiny' wrote:
> > On Wed, Dec 02, 2020 at 12:23:27AM -0500, Pavel Tatashin wrote:
> > > __gup_longterm_locked() has CMA || FS_DAX version and a common stub
> > > version. In the preparation of prohibiting longterm pinning of pages from
> > > movable zone make the CMA || FS_DAX version common, and delete the stub
> > > version.
> > >
> > > Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com>
> > > ---
> > > mm/gup.c | 13 -------------
> > > 1 file changed, 13 deletions(-)
> > >
> > > diff --git a/mm/gup.c b/mm/gup.c
> > > index 3a76c005a3e2..0e2de888a8b0 100644
> > > --- a/mm/gup.c
> > > +++ b/mm/gup.c
> > > @@ -1567,7 +1567,6 @@ struct page *get_dump_page(unsigned long addr)
> > > }
> > > #endif /* CONFIG_ELF_CORE */
> > >
> > > -#if defined(CONFIG_FS_DAX) || defined (CONFIG_CMA)
> > > #ifdef CONFIG_FS_DAX
> > > static bool check_dax_vmas(struct vm_area_struct **vmas, long nr_pages)
> > > {
> > > @@ -1757,18 +1756,6 @@ static long __gup_longterm_locked(struct mm_struct *mm,
> > > kfree(vmas_tmp);
> > > return rc;
> > > }
> >
> > Isn't this going to potentially allocate vmas_tmp only to not need it when
> > !FS_DAX and !CMA?
>
> To clarify, when FOLL_LONGTERM is set...

Yes, this is the case. We need that because once migration is checked
for all allocations, not only CMA, we need vmas_tmp for all cases.

Pasha

>
> IRa
>
> >
> > Ira
> >
> > > -#else /* !CONFIG_FS_DAX && !CONFIG_CMA */
> > > -static __always_inline long __gup_longterm_locked(struct mm_struct *mm,
> > > - unsigned long start,
> > > - unsigned long nr_pages,
> > > - struct page **pages,
> > > - struct vm_area_struct **vmas,
> > > - unsigned int flags)
> > > -{
> > > - return __get_user_pages_locked(mm, start, nr_pages, pages, vmas,
> > > - NULL, flags);
> > > -}
> > > -#endif /* CONFIG_FS_DAX || CONFIG_CMA */
> > >
> > > static bool is_valid_gup_flags(unsigned int gup_flags)
> > > {
> > > --
> > > 2.25.1
> > >
> > >
> >

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