From: js1304@gmail.com
To: Andrew Morton <akpm@linux-foundation.org>
Cc: "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
Andrey Ryabinin <aryabinin@virtuozzo.com>,
Alexander Potapenko <glider@google.com>,
Dmitry Vyukov <dvyukov@google.com>,
kasan-dev@googlegroups.com, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, kernel-team@lge.com,
Joonsoo Kim <iamjoonsoo.kim@lge.com>
Subject: [PATCH] mm/kasan: use kasan_zero_pud for p4d table
Date: Mon, 15 May 2017 15:20:55 +0900 [thread overview]
Message-ID: <1494829255-23946-1-git-send-email-iamjoonsoo.kim@lge.com> (raw)
From: Joonsoo Kim <iamjoonsoo.kim@lge.com>
There is missing optimization in zero_p4d_populate() that can save
some memory when mapping zero shadow. Implement it like as others.
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
---
mm/kasan/kasan_init.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/mm/kasan/kasan_init.c b/mm/kasan/kasan_init.c
index b96a5f7..554e4c0 100644
--- a/mm/kasan/kasan_init.c
+++ b/mm/kasan/kasan_init.c
@@ -118,6 +118,18 @@ static void __init zero_p4d_populate(pgd_t *pgd, unsigned long addr,
do {
next = p4d_addr_end(addr, end);
+ if (IS_ALIGNED(addr, P4D_SIZE) && end - addr >= P4D_SIZE) {
+ pud_t *pud;
+ pmd_t *pmd;
+
+ p4d_populate(&init_mm, p4d, lm_alias(kasan_zero_pud));
+ pud = pud_offset(p4d, addr);
+ pud_populate(&init_mm, pud, lm_alias(kasan_zero_pmd));
+ pmd = pmd_offset(pud, addr);
+ pmd_populate_kernel(&init_mm, pmd,
+ lm_alias(kasan_zero_pte));
+ continue;
+ }
if (p4d_none(*p4d)) {
p4d_populate(&init_mm, p4d,
--
2.7.4
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next reply other threads:[~2017-05-15 6:21 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-15 6:20 js1304 [this message]
2017-05-15 8:29 ` Andrey Ryabinin
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