mm/mprotect: Use maple tree navigation instead of vma linked list

Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>

diff --git a/mm/mprotect.c b/mm/mprotect.c
index e552f5e0ccbded82e503eba25f45b8a3a938c2c2..7af58fd467c6f80be714e5e4f7fe4bc4a240dcd7 100644 (file)
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -528,6 +528,7 @@ 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);
 
@@ -559,7 +560,7 @@ 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);
+       vma = mas_find(&mas, ULONG_MAX);
        error = -ENOMEM;
        if (!vma)
                goto out;
@@ -585,7 +586,7 @@ static int do_mprotect_pkey(unsigned long start, size_t len,
        if (start > vma->vm_start)
                prev = vma;
        else
-               prev = vma->vm_prev;
+               prev = mas_prev(&mas, 0);
 
        for (nstart = start ; ; ) {
                unsigned long mask_off_old_flags;
@@ -647,7 +648,7 @@ static int do_mprotect_pkey(unsigned long start, size_t len,
                if (nstart >= end)
                        goto out;
 
-               vma = prev->vm_next;
+               vma = find_vma(current->mm, prev->vm_end);
                if (!vma || vma->vm_start != nstart) {
                        error = -ENOMEM;
                        goto out;