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Wysocki" , Baoquan He , Wei Yang Subject: Re: [PATCH v1 2/5] drivers/base/memory: map MMOP_OFFLINE to 0 Message-ID: <20200311141820.zgmwiz3rdj5co6kf@master> Reply-To: Wei Yang References: <20200311123026.16071-1-david@redhat.com> <20200311123026.16071-3-david@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200311123026.16071-3-david@redhat.com> User-Agent: NeoMutt/20170113 (1.7.2) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, Mar 11, 2020 at 01:30:23PM +0100, David Hildenbrand wrote: >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 >Cc: Andrew Morton >Cc: Michal Hocko >Cc: Oscar Salvador >Cc: "Rafael J. Wysocki" >Cc: Baoquan He >Cc: Wei Yang >Signed-off-by: David Hildenbrand Reviewed-by: Wei Yang >--- > 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 -- Wei Yang Help you, Help me