Patchwork [RFC,v8,05/20] memory-hotplug: check whether memory is present or not

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Submitter Wen Congyang
Date Aug. 28, 2012, 10 a.m.
Message ID <1346148027-24468-6-git-send-email-wency@cn.fujitsu.com>
Download mbox | patch
Permalink /patch/180418/
State Not Applicable
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Comments

Wen Congyang - Aug. 28, 2012, 10 a.m.
From: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>

If system supports memory hot-remove, online_pages() may online removed pages.
So online_pages() need to check whether onlining pages are present or not.

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>
---
 include/linux/mmzone.h |   19 +++++++++++++++++++
 mm/memory_hotplug.c    |   13 +++++++++++++
 2 files changed, 32 insertions(+), 0 deletions(-)

Patch

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 2daa54f..ac3ae30 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -1180,6 +1180,25 @@  void sparse_init(void);
 #define sparse_index_init(_sec, _nid)  do {} while (0)
 #endif /* CONFIG_SPARSEMEM */
 
+#ifdef CONFIG_SPARSEMEM
+static inline int pfns_present(unsigned long pfn, unsigned long nr_pages)
+{
+	int i;
+	for (i = 0; i < nr_pages; i++) {
+		if (pfn_present(pfn + i))
+			continue;
+		else
+			return -EINVAL;
+	}
+	return 0;
+}
+#else
+static inline int pfns_present(unsigned long pfn, unsigned long nr_pages)
+{
+	return 0;
+}
+#endif /* CONFIG_SPARSEMEM*/
+
 #ifdef CONFIG_NODES_SPAN_OTHER_NODES
 bool early_pfn_in_nid(unsigned long pfn, int nid);
 #else
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 80cded7..3f1d7c5 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -467,6 +467,19 @@  int __ref online_pages(unsigned long pfn, unsigned long nr_pages)
 	struct memory_notify arg;
 
 	lock_memory_hotplug();
+	/*
+	 * If system supports memory hot-remove, the memory may have been
+	 * removed. So we check whether the memory has been removed or not.
+	 *
+	 * Note: When CONFIG_SPARSEMEM is defined, pfns_present() become
+	 *       effective. If CONFIG_SPARSEMEM is not defined, pfns_present()
+	 *       always returns 0.
+	 */
+	ret = pfns_present(pfn, nr_pages);
+	if (ret) {
+		unlock_memory_hotplug();
+		return ret;
+	}
 	arg.start_pfn = pfn;
 	arg.nr_pages = nr_pages;
 	arg.status_change_nid = -1;