On Wed, Mar 18, 2020 at 3:07 PM Mike Kravetz [off-list ref] wrote:

The architecture independent routine hugetlb_default_setup sets up
the default huge pages size.  It has no way to verify if the passed
value is valid, so it accepts it and attempts to validate at a later
time.  This requires undocumented cooperation between the arch specific
and arch independent code.

For architectures that support more than one huge page size, provide
a routine arch_hugetlb_valid_size to validate a huge page size.
hugetlb_default_setup can use this to validate passed values.

arch_hugetlb_valid_size will also be used in a subsequent patch to
move processing of the "hugepagesz=" in arch specific code to a common
routine in arch independent code.

Signed-off-by: Mike Kravetz <redacted>
---
 arch/arm64/include/asm/hugetlb.h   |  2 ++
 arch/arm64/mm/hugetlbpage.c        | 19 ++++++++++++++-----
 arch/powerpc/include/asm/hugetlb.h |  3 +++
 arch/powerpc/mm/hugetlbpage.c      | 20 +++++++++++++-------
 arch/riscv/include/asm/hugetlb.h   |  3 +++
 arch/riscv/mm/hugetlbpage.c        | 28 ++++++++++++++++++----------
 arch/s390/include/asm/hugetlb.h    |  3 +++
 arch/s390/mm/hugetlbpage.c         | 18 +++++++++++++-----
 arch/sparc/include/asm/hugetlb.h   |  3 +++
 arch/sparc/mm/init_64.c            | 23 ++++++++++++++++-------
 arch/x86/include/asm/hugetlb.h     |  3 +++
 arch/x86/mm/hugetlbpage.c          | 21 +++++++++++++++------
 include/linux/hugetlb.h            |  7 +++++++
 mm/hugetlb.c                       | 16 +++++++++++++---
 14 files changed, 126 insertions(+), 43 deletions(-)

With build fixes:
Acked-by: Mina Almasry <redacted>

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