[v5,00/11] hugetlb: Factorize hugetlb architecture primitives

[CC linux-mm for inclusion in -mm tree] 

In order to reduce copy/paste of functions across architectures and then
make riscv hugetlb port (and future ports) simpler and smaller, this
patchset intends to factorize the numerous hugetlb primitives that are
defined across all the architectures.

Except for prepare_hugepage_range, this patchset moves the versions that
are just pass-through to standard pte primitives into
asm-generic/hugetlb.h by using the same #ifdef semantic that can be
found in asm-generic/pgtable.h, i.e. __HAVE_ARCH_***.

s390 architecture has not been tackled in this serie since it does not
use asm-generic/hugetlb.h at all.
powerpc could be factorized a bit more (cf huge_ptep_set_wrprotect).

This patchset has been compiled on all addressed architectures with
success (except for parisc, but the problem does not come from this series). 

Tested-by: Helge Deller <deller@gmx.de> # parisc
Acked-by: Paul Burton <paul.burton@mips.com> # MIPS parts

Changelog:

v5:
  As suggested by Mike Kravetz, no need to move the #include
  <asm-generic/hugetlb.h> for arm and x86 architectures, let it live at
  the top of the file.

v4:
  Fix powerpc build error due to misplacing of #include
  <asm-generic/hugetlb.h> outside of #ifdef CONFIG_HUGETLB_PAGE, as
  pointed by Christophe Leroy.

v1, v2, v3:
  Same version, just problems with email provider and misuse of
  --batch-size option of git send-email

Alexandre Ghiti (11):
  hugetlb: Harmonize hugetlb.h arch specific defines with pgtable.h
  hugetlb: Introduce generic version of hugetlb_free_pgd_range
  hugetlb: Introduce generic version of set_huge_pte_at
  hugetlb: Introduce generic version of huge_ptep_get_and_clear
  hugetlb: Introduce generic version of huge_ptep_clear_flush
  hugetlb: Introduce generic version of huge_pte_none
  hugetlb: Introduce generic version of huge_pte_wrprotect
  hugetlb: Introduce generic version of prepare_hugepage_range
  hugetlb: Introduce generic version of huge_ptep_set_wrprotect
  hugetlb: Introduce generic version of huge_ptep_set_access_flags
  hugetlb: Introduce generic version of huge_ptep_get

 arch/arm/include/asm/hugetlb-3level.h        | 32 +---------
 arch/arm/include/asm/hugetlb.h               | 30 ----------
 arch/arm64/include/asm/hugetlb.h             | 39 +++---------
 arch/ia64/include/asm/hugetlb.h              | 47 ++-------------
 arch/mips/include/asm/hugetlb.h              | 40 +++----------
 arch/parisc/include/asm/hugetlb.h            | 33 +++--------
 arch/powerpc/include/asm/book3s/32/pgtable.h |  2 +
 arch/powerpc/include/asm/book3s/64/pgtable.h |  1 +
 arch/powerpc/include/asm/hugetlb.h           | 43 ++------------
 arch/powerpc/include/asm/nohash/32/pgtable.h |  2 +
 arch/powerpc/include/asm/nohash/64/pgtable.h |  1 +
 arch/sh/include/asm/hugetlb.h                | 54 ++---------------
 arch/sparc/include/asm/hugetlb.h             | 40 +++----------
 arch/x86/include/asm/hugetlb.h               | 69 ----------------------
 include/asm-generic/hugetlb.h                | 88 +++++++++++++++++++++++++++-
 15 files changed, 139 insertions(+), 382 deletions(-)

On Tue, Jul 31, 2018 at 06:01:44AM +0000, Alexandre Ghiti wrote:
> Alexandre Ghiti (11):
>   hugetlb: Harmonize hugetlb.h arch specific defines with pgtable.h
>   hugetlb: Introduce generic version of hugetlb_free_pgd_range
>   hugetlb: Introduce generic version of set_huge_pte_at
>   hugetlb: Introduce generic version of huge_ptep_get_and_clear
>   hugetlb: Introduce generic version of huge_ptep_clear_flush
>   hugetlb: Introduce generic version of huge_pte_none
>   hugetlb: Introduce generic version of huge_pte_wrprotect
>   hugetlb: Introduce generic version of prepare_hugepage_range
>   hugetlb: Introduce generic version of huge_ptep_set_wrprotect
>   hugetlb: Introduce generic version of huge_ptep_set_access_flags
>   hugetlb: Introduce generic version of huge_ptep_get
[...]
>  arch/arm64/include/asm/hugetlb.h             | 39 +++---------

For the arm64 bits in this series:

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
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On Tue, 31 Jul 2018 06:01:44 +0000
Alexandre Ghiti <alex@ghiti.fr> wrote:

> [CC linux-mm for inclusion in -mm tree] 
> 
> In order to reduce copy/paste of functions across architectures and then
> make riscv hugetlb port (and future ports) simpler and smaller, this
> patchset intends to factorize the numerous hugetlb primitives that are
> defined across all the architectures.

[...]

>  15 files changed, 139 insertions(+), 382 deletions(-)

I imagine you're mostly interested in non-x86 review at this point, but
as this series is looking amazing:

Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
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On 07/31/2018 10:06 PM, Luiz Capitulino wrote:
> On Tue, 31 Jul 2018 06:01:44 +0000
> Alexandre Ghiti <alex@ghiti.fr> wrote:
>
>> [CC linux-mm for inclusion in -mm tree]
>>
>> In order to reduce copy/paste of functions across architectures and then
>> make riscv hugetlb port (and future ports) simpler and smaller, this
>> patchset intends to factorize the numerous hugetlb primitives that are
>> defined across all the architectures.
> [...]
>
>>   15 files changed, 139 insertions(+), 382 deletions(-)
> I imagine you're mostly interested in non-x86 review at this point, but
> as this series is looking amazing:
>
> Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>

It's always good to have another feedback :)
Thanks for your review Luiz,

Alex
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