| Date | Fri, 24 Jun 2022 17:36:40 +0000 | Subject | [RFC PATCH 10/26] hugetlb: add for_each_hgm_shift | From | James Houghton <> |
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This is a helper macro to loop through all the usable page sizes for a high-granularity-enabled HugeTLB VMA. Given the VMA's hstate, it will loop, in descending order, through the page sizes that HugeTLB supports for this architecture; it always includes PAGE_SIZE.
Signed-off-by: James Houghton <jthoughton@google.com> --- mm/hugetlb.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 8b10b941458d..557b0afdb503 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -6989,6 +6989,16 @@ bool hugetlb_hgm_enabled(struct vm_area_struct *vma) /* All shared VMAs have HGM enabled. */ return vma->vm_flags & VM_SHARED; } +static unsigned int __shift_for_hstate(struct hstate *h) +{ + if (h >= &hstates[hugetlb_max_hstate]) + return PAGE_SHIFT; + return huge_page_shift(h); +} +#define for_each_hgm_shift(hstate, tmp_h, shift) \ + for ((tmp_h) = hstate; (shift) = __shift_for_hstate(tmp_h), \ + (tmp_h) <= &hstates[hugetlb_max_hstate]; \ + (tmp_h)++) #endif /* CONFIG_HUGETLB_HIGH_GRANULARITY_MAPPING */ /* -- 2.37.0.rc0.161.g10f37bed90-goog
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