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Groups > linux.kernel > #1354070
| From | Anshuman Khandual <khandual@linux.vnet.ibm.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [RFC 1/9] mm/hugetlb: Make GENERAL_HUGETLB functions PGD implementation aware |
| Date | 2016-03-09 13:20 +0100 |
| Message-ID | <raLfP-7Ms-3@gated-at.bofh.it> (permalink) |
| Organization | linux.* mail to news gateway |
Currently both the ARCH_WANT_GENERAL_HUGETLB functions 'huge_pte_alloc'
and 'huge_pte_offset' dont take into account huge page implementation
at the PGD level. With addition of PGD awareness into these functions,
more architectures like POWER which also implements huge pages at PGD
level (along with PMD level), can use ARCH_WANT_GENERAL_HUGETLB option.
Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
---
mm/hugetlb.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 01f2b48..a478b7b 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -4251,6 +4251,11 @@ pte_t *huge_pte_alloc(struct mm_struct *mm,
pte_t *pte = NULL;
pgd = pgd_offset(mm, addr);
+ if (sz == PGDIR_SIZE) {
+ pte = (pte_t *)pgd;
+ goto huge_pgd;
+ }
+
pud = pud_alloc(mm, pgd, addr);
if (pud) {
if (sz == PUD_SIZE) {
@@ -4263,6 +4268,8 @@ pte_t *huge_pte_alloc(struct mm_struct *mm,
pte = (pte_t *)pmd_alloc(mm, pud, addr);
}
}
+
+huge_pgd:
BUG_ON(pte && !pte_none(*pte) && !pte_huge(*pte));
return pte;
@@ -4276,6 +4283,8 @@ pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
pgd = pgd_offset(mm, addr);
if (pgd_present(*pgd)) {
+ if (pgd_huge(*pgd))
+ return (pte_t *)pgd;
pud = pud_offset(pgd, addr);
if (pud_present(*pud)) {
if (pud_huge(*pud))
--
2.1.0
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[RFC 1/9] mm/hugetlb: Make GENERAL_HUGETLB functions PGD implementation aware Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2016-03-09 13:20 +0100
[RFC 4/9] powerpc/mm: Split huge_pte_alloc function for BOOK3S 64K Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2016-03-09 13:20 +0100
Re: [RFC 4/9] powerpc/mm: Split huge_pte_alloc function for BOOK3S 64K "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> - 2016-03-09 21:00 +0100
Re: [RFC 4/9] powerpc/mm: Split huge_pte_alloc function for BOOK3S 64K Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2016-03-10 06:40 +0100
[RFC 6/9] powerpc/hugetlb: Enable ARCH_WANT_GENERAL_HUGETLB for BOOK3S 64K Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2016-03-09 13:20 +0100
Re: [RFC 6/9] powerpc/hugetlb: Enable ARCH_WANT_GENERAL_HUGETLB for BOOK3S 64K "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> - 2016-03-09 21:00 +0100
Re: [RFC 6/9] powerpc/hugetlb: Enable ARCH_WANT_GENERAL_HUGETLB for BOOK3S 64K Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2016-03-10 06:20 +0100
[RFC 5/9] powerpc/mm: Split huge_pte_offset function for BOOK3S 64K Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2016-03-09 13:20 +0100
Re: [RFC 5/9] powerpc/mm: Split huge_pte_offset function for BOOK3S 64K Dave Hansen <dave.hansen@intel.com> - 2016-03-10 00:00 +0100
Re: [RFC 5/9] powerpc/mm: Split huge_pte_offset function for BOOK3S 64K Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2016-03-10 04:40 +0100
Re: [RFC 1/9] mm/hugetlb: Make GENERAL_HUGETLB functions PGD implementation aware Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2016-03-11 04:10 +0100
Re: [RFC 1/9] mm/hugetlb: Make GENERAL_HUGETLB functions PGD implementation aware Andrew Morton <akpm@linux-foundation.org> - 2016-03-14 21:30 +0100
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