From: David Hildenbrand <david@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org,
linux-hyperv@vger.kernel.org,
David Hildenbrand <david@redhat.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
Michal Hocko <mhocko@kernel.org>,
Oscar Salvador <osalvador@suse.de>,
"Rafael J. Wysocki" <rafael@kernel.org>,
Baoquan He <bhe@redhat.com>, Wei Yang <richard.weiyang@gmail.com>
Subject: [PATCH v1 2/5] drivers/base/memory: map MMOP_OFFLINE to 0
Date: Wed, 11 Mar 2020 13:30:23 +0100 [thread overview]
Message-ID: <20200311123026.16071-3-david@redhat.com> (raw)
In-Reply-To: <20200311123026.16071-1-david@redhat.com>
I have no idea why we have to start at -1. Just treat 0 as the special
case. Clarify a comment (which was wrong, when we come via
device_online() the first time, the online_type would have been 0 /
MEM_ONLINE). The default is now always MMOP_OFFLINE.
This is a preparation to use the online_type as an array index.
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Baoquan He <bhe@redhat.com>
Cc: Wei Yang <richard.weiyang@gmail.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
---
drivers/base/memory.c | 11 ++++-------
include/linux/memory_hotplug.h | 2 +-
2 files changed, 5 insertions(+), 8 deletions(-)
diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index 8c5ce42c0fc3..e7e77cafef80 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -211,17 +211,14 @@ static int memory_subsys_online(struct device *dev)
return 0;
/*
- * If we are called from state_store(), online_type will be
- * set >= 0 Otherwise we were called from the device online
- * attribute and need to set the online_type.
+ * When called via device_online() without configuring the online_type,
+ * we want to default to MMOP_ONLINE.
*/
- if (mem->online_type < 0)
+ if (mem->online_type == MMOP_OFFLINE)
mem->online_type = MMOP_ONLINE;
ret = memory_block_change_state(mem, MEM_ONLINE, MEM_OFFLINE);
-
- /* clear online_type */
- mem->online_type = -1;
+ mem->online_type = MMOP_OFFLINE;
return ret;
}
diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index 261dbf010d5d..c2e06ed5e0e9 100644
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -48,7 +48,7 @@ enum {
/* Types for control the zone type of onlined and offlined memory */
enum {
/* Offline the memory. */
- MMOP_OFFLINE = -1,
+ MMOP_OFFLINE = 0,
/* Online the memory. Zone depends, see default_zone_for_pfn(). */
MMOP_ONLINE,
/* Online the memory to ZONE_NORMAL. */
--
2.24.1
next prev parent reply other threads:[~2020-03-11 12:30 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-11 12:30 [PATCH v1 0/5] mm/memory_hotplug: allow to specify a default online_type David Hildenbrand
2020-03-11 12:30 ` [PATCH v1 1/5] drivers/base/memory: rename MMOP_ONLINE_KEEP to MMOP_ONLINE David Hildenbrand
2020-03-11 14:17 ` Wei Yang
2020-03-16 15:12 ` Michal Hocko
2020-03-16 15:17 ` David Hildenbrand
2020-03-11 12:30 ` David Hildenbrand [this message]
2020-03-11 14:18 ` [PATCH v1 2/5] drivers/base/memory: map MMOP_OFFLINE to 0 Wei Yang
2020-03-16 15:19 ` Michal Hocko
2020-03-11 12:30 ` [PATCH v1 3/5] drivers/base/memory: store mapping between MMOP_* and string in an array David Hildenbrand
2020-03-11 14:20 ` Wei Yang
2020-03-11 14:27 ` Wei Yang
2020-03-16 15:20 ` Michal Hocko
2020-03-11 12:30 ` [PATCH v1 4/5] mm/memory_hotplug: convert memhp_auto_online to store an online_type David Hildenbrand
2020-03-11 14:25 ` Wei Yang
2020-03-16 15:24 ` Michal Hocko
2020-03-16 15:34 ` David Hildenbrand
2020-03-16 15:46 ` Michal Hocko
2020-03-11 12:30 ` [PATCH v1 5/5] mm/memory_hotplug: allow to specify a default online_type David Hildenbrand
2020-03-11 14:26 ` Wei Yang
2020-03-11 15:20 ` David Hildenbrand
2020-03-11 16:55 ` Vitaly Kuznetsov
2020-03-11 17:05 ` David Hildenbrand
2020-03-16 15:31 ` Michal Hocko
2020-03-16 15:48 ` David Hildenbrand
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