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mm/mprotect: use maple tree navigation instead of VMA linked list

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Switch to navigating the VMA list with the maple tree operators in
preparation for removing the linked list.

Link: https://lkml.kernel.org/r/20220906194824.2110408-59-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Tested-by: Yu Zhao <yuzhao@google.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: SeongJae Park <sj@kernel.org>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Liam R. Howlett 2022-09-06 19:49:02 +00:00 committed by Andrew Morton
parent 33108b05f3
commit 70821e0b89
1 changed files with 5 additions and 3 deletions
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8
mm/mprotect.c
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@ -676,6 +676,7 @@ static int do_mprotect_pkey(unsigned long start, size_t len,
const bool rier = (current->personality & READ_IMPLIES_EXEC) &&
(prot & PROT_READ);
struct mmu_gather tlb;
MA_STATE(mas, &current->mm->mm_mt, 0, 0);
start = untagged_addr(start);
@ -707,7 +708,8 @@ 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_find(&mas, ULONG_MAX);
error = -ENOMEM;
if (!vma)
goto out;
@ -733,7 +735,7 @@ 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);
tlb_gather_mmu(&tlb, current->mm);
for (nstart = start ; ; ) {
@ -796,7 +798,7 @@ static int do_mprotect_pkey(unsigned long start, size_t len,
if (nstart >= end)
break;
vma = prev->vm_next;
vma = find_vma(current->mm, prev->vm_end);
if (!vma || vma->vm_start != nstart) {
error = -ENOMEM;
break;