mm/hmm: simplify hmm_vma_walk_hugetlb_entry()

Remove the rather confusing goto label and just handle the fault case
directly in the branch checking for it.

Link: https://lore.kernel.org/r/20200316135310.899364-4-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

diff --git a/mm/hmm.c b/mm/hmm.c
index df98297..d13dedf 100644 (file)
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -559,7 +559,6 @@ static int hmm_vma_walk_hugetlb_entry(pte_t *pte, unsigned long hmask,
        bool fault, write_fault;
        spinlock_t *ptl;
        pte_t entry;
-       int ret = 0;
 
        ptl = huge_pte_lock(hstate_vma(vma), walk->mm, pte);
        entry = huge_ptep_get(pte);
@@ -572,8 +571,8 @@ static int hmm_vma_walk_hugetlb_entry(pte_t *pte, unsigned long hmask,
        hmm_pte_need_fault(hmm_vma_walk, orig_pfn, cpu_flags,
                           &fault, &write_fault);
        if (fault || write_fault) {
-               ret = -ENOENT;
-               goto unlock;
+               spin_unlock(ptl);
+               return hmm_vma_walk_hole_(addr, end, fault, write_fault, walk);
        }
 
        pfn = pte_pfn(entry) + ((start & ~hmask) >> PAGE_SHIFT);
@@ -581,14 +580,8 @@ static int hmm_vma_walk_hugetlb_entry(pte_t *pte, unsigned long hmask,
                range->pfns[i] = hmm_device_entry_from_pfn(range, pfn) |
                                 cpu_flags;
        hmm_vma_walk->last = end;
-
-unlock:
        spin_unlock(ptl);
-
-       if (ret == -ENOENT)
-               return hmm_vma_walk_hole_(addr, end, fault, write_fault, walk);
-
-       return ret;
+       return 0;
 }
 #else
 #define hmm_vma_walk_hugetlb_entry NULL