reviewed-by: manish.mishra@xxxxxxxxxxx
On 24/06/22 11:06 pm, James Houghton
wrote:
Currently, this is always true if the VMA is shared. In the future, it's possible that private mappings will get some or all HGM functionality. Signed-off-by: James Houghton <jthoughton@xxxxxxxxxx> --- include/linux/hugetlb.h | 10 ++++++++++ mm/hugetlb.c | 8 ++++++++ 2 files changed, 18 insertions(+) diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index 33ba48fac551..e7a6b944d0cc 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -1174,6 +1174,16 @@ static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, } #endif /* CONFIG_HUGETLB_PAGE */ +#ifdef CONFIG_HUGETLB_HIGH_GRANULARITY_MAPPING +/* If HugeTLB high-granularity mappings are enabled for this VMA. */ +bool hugetlb_hgm_enabled(struct vm_area_struct *vma); +#else +static inline bool hugetlb_hgm_enabled(struct vm_area_struct *vma) +{ + return false; +} +#endif + static inline spinlock_t *huge_pte_lock(struct hstate *h, struct mm_struct *mm, pte_t *pte) { diff --git a/mm/hugetlb.c b/mm/hugetlb.c index a2d2ffa76173..8b10b941458d 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -6983,6 +6983,14 @@ pte_t *huge_pte_offset(struct mm_struct *mm, #endif /* CONFIG_ARCH_WANT_GENERAL_HUGETLB */ +#ifdef CONFIG_HUGETLB_HIGH_GRANULARITY_MAPPING +bool hugetlb_hgm_enabled(struct vm_area_struct *vma) +{ + /* All shared VMAs have HGM enabled. */ + return vma->vm_flags & VM_SHARED; +} +#endif /* CONFIG_HUGETLB_HIGH_GRANULARITY_MAPPING */ + /* * These functions are overwritable if your architecture needs its own * behavior.
