From: Baoquan He <bhe@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: akpm@linux-foundation.org, osalvador@suse.de, mhocko@suse.com,
david@redhat.com, richard.weiyang@gmail.com, rppt@linux.ibm.com,
Baoquan He <bhe@redhat.com>
Subject: [PATCH] mm, memory_hotplug: Fix the wrong usage of N_HIGH_MEMORY
Date: Wed, 20 Mar 2019 16:07:32 +0800 [thread overview]
Message-ID: <20190320080732.14933-1-bhe@redhat.com> (raw)
In function node_states_check_changes_online(), N_HIGH_MEMORY is used
to substitute ZONE_HIGHMEM directly. This is not right. N_HIGH_MEMORY
always has value '3' if CONFIG_HIGHMEM=y, while ZONE_HIGHMEM's value
is not. It depends on whether CONFIG_ZONE_DMA/CONFIG_ZONE_DMA32 are
enabled. Obviously it's not true for CONFIG_ZONE_DMA32 on 32bit system,
and CONFIG_ZONE_DMA is also optional.
Replace it with ZONE_HIGHMEM.
Fixes: 8efe33f40f3e ("mm/memory_hotplug.c: simplify node_states_check_changes_online")
Signed-off-by: Baoquan He <bhe@redhat.com>
---
mm/memory_hotplug.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 6b05576fb4ec..09911d34a3be 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -712,7 +712,7 @@ static void node_states_check_changes_online(unsigned long nr_pages,
if (zone_idx(zone) <= ZONE_NORMAL && !node_state(nid, N_NORMAL_MEMORY))
arg->status_change_nid_normal = nid;
#ifdef CONFIG_HIGHMEM
- if (zone_idx(zone) <= N_HIGH_MEMORY && !node_state(nid, N_HIGH_MEMORY))
+ if (zone_idx(zone) <= ZONE_HIGHMEM && !node_state(nid, N_HIGH_MEMORY))
arg->status_change_nid_high = nid;
#endif
}
--
2.17.2
next reply other threads:[~2019-03-20 8:07 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-20 8:07 Baoquan He [this message]
2019-03-20 8:46 ` [PATCH] mm, memory_hotplug: Fix the wrong usage of N_HIGH_MEMORY Michal Hocko
2019-03-20 9:06 ` Baoquan He
2019-03-20 9:11 ` David Hildenbrand
2019-03-20 9:29 ` Baoquan He
2019-03-20 9:37 ` Michal Hocko
2019-03-20 12:27 ` Oscar Salvador
2019-03-20 12:28 ` Oscar Salvador
2019-03-20 19:12 ` Andrew Morton
2019-03-20 19:53 ` 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=20190320080732.14933-1-bhe@redhat.com \
--to=bhe@redhat.com \
--cc=akpm@linux-foundation.org \
--cc=david@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mhocko@suse.com \
--cc=osalvador@suse.de \
--cc=richard.weiyang@gmail.com \
--cc=rppt@linux.ibm.com \
/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).