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    SubjectRe: [RFC PATCH 10/26] hugetlb: add for_each_hgm_shift
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    On 24/06/22 11:06 pm, James Houghton wrote:
    > 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.
    reviewed-by:manish.mishra@nutanix.com
    > 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 */
    >
    > /*

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