From: qiwuchen55@gmail.com
To: akpm@linux-foundation.org, mhocko@suse.com, willy@infradead.org
Cc: linux-mm@kvack.org, chenqiwu <chenqiwu@xiaomi.com>
Subject: [PATCH 1/2] mm/memory: remove redundant pte_devmap case for copy_one_pte()
Date: Sun, 19 Apr 2020 11:30:16 +0800 [thread overview]
Message-ID: <1587267017-25310-1-git-send-email-qiwuchen55@gmail.com> (raw)
From: chenqiwu <chenqiwu@xiaomi.com>
As discussed in patch[1], special mapping ptes such as device
mapping ptes don't need to operate on their corresponding pages,
so the redundant pte_devmap case can be removed.
[1] https://patchwork.kernel.org/patch/11494691/
Signed-off-by: chenqiwu <chenqiwu@xiaomi.com>
---
mm/memory.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/mm/memory.c b/mm/memory.c
index f703fe8..2143827 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -802,8 +802,6 @@ struct page *vm_normal_page_pmd(struct vm_area_struct *vma, unsigned long addr,
get_page(page);
page_dup_rmap(page, false);
rss[mm_counter(page)]++;
- } else if (pte_devmap(pte)) {
- page = pte_page(pte);
}
out_set_pte:
--
1.9.1
next reply other threads:[~2020-04-19 3:30 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-19 3:30 qiwuchen55 [this message]
2020-04-19 3:30 ` [PATCH 2/2] mm/memory: put refcount of normal page in zap_pte_range() qiwuchen55
2020-04-19 10:30 ` Matthew Wilcox
2020-04-19 10:26 ` [PATCH 1/2] mm/memory: remove redundant pte_devmap case for copy_one_pte() Matthew Wilcox
2020-04-20 7:54 ` Michal Hocko
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1587267017-25310-1-git-send-email-qiwuchen55@gmail.com \
--to=qiwuchen55@gmail.com \
--cc=akpm@linux-foundation.org \
--cc=chenqiwu@xiaomi.com \
--cc=linux-mm@kvack.org \
--cc=mhocko@suse.com \
--cc=willy@infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox