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mm/hugetlb: introduce huge pte version of uffd-wp helpers 

They will be used in the follow up patches to either check/set/clear
uffd-wp bit of a huge pte.

So far it reuses all the small pte helpers.  Archs can overwrite these
versions when necessary (with __HAVE_ARCH_HUGE_PTE_UFFD_WP* macros) in the
future.

Link: https://lkml.kernel.org/r/20220405014858.14531-1-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: "Kirill A . Shutemov" <kirill@shutemov.name>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Nadav Amit <nadav.amit@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Peter Xu 2022-05-12 20:22:54 -07:00 committed by Andrew Morton
parent c56d1b62cc
commit 229f3fa778
2 changed files with 30 additions and 0 deletions
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15
arch/s390/include/asm/hugetlb.h
View File

@ -120,6 +120,21 @@ static inline pte_t huge_pte_modify(pte_t pte, pgprot_t newprot)
return pte_modify(pte, newprot);
}
static inline pte_t huge_pte_mkuffd_wp(pte_t pte)
{
return pte;
}
static inline pte_t huge_pte_clear_uffd_wp(pte_t pte)
{
return pte;
}
static inline int huge_pte_uffd_wp(pte_t pte)
{
return 0;
}
static inline bool gigantic_page_runtime_supported(void)
{
return true;

15
include/asm-generic/hugetlb.h
View File

@ -35,6 +35,21 @@ static inline pte_t huge_pte_modify(pte_t pte, pgprot_t newprot)
return pte_modify(pte, newprot);
}
static inline pte_t huge_pte_mkuffd_wp(pte_t pte)
{
return pte_mkuffd_wp(pte);
}
static inline pte_t huge_pte_clear_uffd_wp(pte_t pte)
{
return pte_clear_uffd_wp(pte);
}
static inline int huge_pte_uffd_wp(pte_t pte)
{
return pte_uffd_wp(pte);
}
#ifndef __HAVE_ARCH_HUGE_PTE_CLEAR
static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, unsigned long sz)