From: Wei Yang <richard.weiyang@gmail.com>
To: mhocko@kernel.org
Cc: linux-mm@kvack.org, akpm@linux-foundation.org,
Wei Yang <richard.weiyang@gmail.com>
Subject: [PATCH 1/2] mmzone: simplify zone_intersects()
Date: Fri, 16 Jun 2017 17:23:34 +0800 [thread overview]
Message-ID: <20170616092335.5177-1-richard.weiyang@gmail.com> (raw)
To make sure a range intersects a zone, only two comparison is necessary.
This patch simplifies the function a little.
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
---
include/linux/mmzone.h | 10 +++-------
1 file changed, 3 insertions(+), 7 deletions(-)
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 0176a2933c61..7e8f100cb56d 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -541,15 +541,11 @@ static inline bool zone_intersects(struct zone *zone,
{
if (zone_is_empty(zone))
return false;
- if (start_pfn >= zone_end_pfn(zone))
+ if (start_pfn >= zone_end_pfn(zone) ||
+ start_pfn + nr_pages <= zone->zone_start_pfn)
return false;
- if (zone->zone_start_pfn <= start_pfn)
- return true;
- if (start_pfn + nr_pages > zone->zone_start_pfn)
- return true;
-
- return false;
+ return true;
}
/*
--
2.11.0
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next reply other threads:[~2017-06-16 9:24 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-16 9:23 Wei Yang [this message]
2017-06-16 9:23 ` [PATCH 2/2] mm/memory_hotplug: remove duplicate call for set_page_links Wei Yang
2017-06-16 17:33 ` Andrew Morton
2017-06-17 2:55 ` Wei Yang
2017-06-22 6:50 ` Michal Hocko
2017-06-18 16:59 ` [PATCH 1/2] mmzone: simplify zone_intersects() 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=20170616092335.5177-1-richard.weiyang@gmail.com \
--to=richard.weiyang@gmail.com \
--cc=akpm@linux-foundation.org \
--cc=linux-mm@kvack.org \
--cc=mhocko@kernel.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;
as well as URLs for NNTP newsgroup(s).