[PATCH v2 60/70] mm/mprotect: Use maple tree navigation instead of vma linked list

[Liam R. Howlett]

Signed-off-by: Liam R. Howlett <liam.howl...@oracle.com>
---
 mm/mprotect.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/mm/mprotect.c b/mm/mprotect.c
index 56c02beb60414..a6208b872336e 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -518,6 +518,7 @@ static int do_mprotect_pkey(unsigned long start, size_t len,
        const int grows = prot & (PROT_GROWSDOWN|PROT_GROWSUP);
        const bool rier = (current->personality & READ_IMPLIES_EXEC) &&
                                (prot & PROT_READ);
+       MA_STATE(mas, &current->mm->mm_mt, start, start);
 
        start = untagged_addr(start);
 
@@ -549,11 +550,12 @@ static int do_mprotect_pkey(unsigned long start, size_t 
len,
        if ((pkey != -1) && !mm_pkey_is_allocated(current->mm, pkey))
                goto out;
 
-       vma = find_vma(current->mm, start);
+       mas_set(&mas, start);
+       vma = mas_walk(&mas);
        error = -ENOMEM;
        if (!vma)
                goto out;
-       prev = vma->vm_prev;
+       prev = mas_prev(&mas, 0);
        if (unlikely(grows & PROT_GROWSDOWN)) {
                if (vma->vm_start >= end)
                        goto out;
@@ -626,7 +628,7 @@ static int do_mprotect_pkey(unsigned long start, size_t len,
                if (nstart >= end)
                        goto out;
 
-               vma = prev->vm_next;
+               vma = mas_next(&mas, ULONG_MAX);
                if (!vma || vma->vm_start != nstart) {
                        error = -ENOMEM;
                        goto out;
-- 
2.28.0