| Message ID | 1343980161-14254-14-git-send-email-wency@cn.fujitsu.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
At 08/03/2012 03:49 PM, wency@cn.fujitsu.com Wrote: > From: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> > > There is a possibility that get_page_bootmem() is called to the same page many > times. So when get_page_bootmem is called to the same page, the function only > increments page->_count. > > CC: David Rientjes <rientjes@google.com> > CC: Jiang Liu <liuj97@gmail.com> > CC: Len Brown <len.brown@intel.com> > CC: Benjamin Herrenschmidt <benh@kernel.crashing.org> > CC: Paul Mackerras <paulus@samba.org> > CC: Christoph Lameter <cl@linux.com> > Cc: Minchan Kim <minchan.kim@gmail.com> > CC: Andrew Morton <akpm@linux-foundation.org> > CC: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> > CC: Wen Congyang <wency@cn.fujitsu.com> > Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> > --- > mm/memory_hotplug.c | 15 +++++++++++---- > 1 files changed, 11 insertions(+), 4 deletions(-) > > diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c > index 5f9f8c7..710e593 100644 > --- a/mm/memory_hotplug.c > +++ b/mm/memory_hotplug.c > @@ -95,10 +95,17 @@ static void release_memory_resource(struct resource *res) > static void get_page_bootmem(unsigned long info, struct page *page, > unsigned long type) > { > - page->lru.next = (struct list_head *) type; > - SetPagePrivate(page); > - set_page_private(page, info); > - atomic_inc(&page->_count); > + unsigned long page_type; > + > + page_type = (unsigned long) page->lru.next; > + if (type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE || > + type > MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE){ I think it should be page_type not type here. Thanks Wen Congyang > + page->lru.next = (struct list_head *) type; > + SetPagePrivate(page); > + set_page_private(page, info); > + atomic_inc(&page->_count); > + } else > + atomic_inc(&page->_count); > } > > /* reference to __meminit __free_pages_bootmem is valid
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 5f9f8c7..710e593 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -95,10 +95,17 @@ static void release_memory_resource(struct resource *res) static void get_page_bootmem(unsigned long info, struct page *page, unsigned long type) { - page->lru.next = (struct list_head *) type; - SetPagePrivate(page); - set_page_private(page, info); - atomic_inc(&page->_count); + unsigned long page_type; + + page_type = (unsigned long) page->lru.next; + if (type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE || + type > MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE){ + page->lru.next = (struct list_head *) type; + SetPagePrivate(page); + set_page_private(page, info); + atomic_inc(&page->_count); + } else + atomic_inc(&page->_count); } /* reference to __meminit __free_pages_bootmem is valid