[PATCH v4 02/10] mm, hugetlbfs: Allow an arch to always use generic versions of get_unmapped_area functions

[Nicholas Piggin]

Excerpts from Christophe Leroy's message of December 9, 2021 3:18 am:
> Unlike most architectures, powerpc can only define at runtime
> if it is going to use the generic arch_get_unmapped_area() or not.
> 
> Today, powerpc has a copy of the generic arch_get_unmapped_area()
> because when selection HAVE_ARCH_UNMAPPED_AREA the generic
> arch_get_unmapped_area() is not available.
> 
> Rename it generic_get_unmapped_area() and make it independent of
> HAVE_ARCH_UNMAPPED_AREA.
> 
> Do the same for arch_get_unmapped_area_topdown() versus
> HAVE_ARCH_UNMAPPED_AREA_TOPDOWN.
> 
> Do the same for hugetlb_get_unmapped_area() versus
> HAVE_ARCH_HUGETLB_UNMAPPED_AREA.
> 

Reviewed-by: Nicholas Piggin <npiggin at gmail.com>

> Signed-off-by: Christophe Leroy <christophe.leroy at csgroup.eu>
> ---
>  fs/hugetlbfs/inode.c     | 17 +++++++++++++----
>  include/linux/hugetlb.h  |  5 +++++
>  include/linux/sched/mm.h |  9 +++++++++
>  mm/mmap.c                | 31 ++++++++++++++++++++++++-------
>  4 files changed, 51 insertions(+), 11 deletions(-)
>