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Message-ID: <20220215144241.3812052-60-Liam.Howlett@oracle.com>
Date: Tue, 15 Feb 2022 14:43:25 +0000
From: Liam Howlett <liam.howlett@...cle.com>
To: "maple-tree@...ts.infradead.org" <maple-tree@...ts.infradead.org>,
"linux-mm@...ck.org" <linux-mm@...ck.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH v6 60/71] mm/mprotect: Use maple tree navigation instead of
vma linked list
From: "Liam R. Howlett" <Liam.Howlett@...cle.com>
Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
Acked-by: Vlastimil Babka <vbabka@...e.cz>
---
mm/mprotect.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/mm/mprotect.c b/mm/mprotect.c
index 0138dfcdb1d8..51ef845df4c8 100644
--- 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, ¤t->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;
--
2.34.1
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