path: root/mm/memory_hotplug.c
diff options
authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>2009-09-22 16:45:46 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-23 07:39:41 -0700
commit908eedc6168bd92e89f90d89fa389065a36358fa (patch)
tree612881abb2aae920ab1e62e88990ee7b6a988f51 /mm/memory_hotplug.c
parent9492587cf35d370db33ef4b38375dfb35a105b61 (diff)
walk system ram range
Originally, walk_memory_resource() was introduced to traverse all memory of "System RAM" for detecting memory hotplug/unplug range. For doing so, flags of IORESOUCE_MEM|IORESOURCE_BUSY was used and this was enough for memory hotplug. But for using other purpose, /proc/kcore, this may includes some firmware area marked as IORESOURCE_BUSY | IORESOUCE_MEM. This patch makes the check strict to find out busy "System RAM". Note: PPC64 keeps their own walk_memory_resouce(), which walk through ppc64's lmb informaton. Because old kclist_add() is called per lmb, this patch makes no difference in behavior, finally. And this patch removes CONFIG_MEMORY_HOTPLUG check from this function. Because pfn_valid() just show "there is memmap or not* and cannot be used for "there is physical memory or not", this function is useful in generic to scan physical memory range. Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: WANG Cong <xiyou.wangcong@gmail.com> Cc: Américo Wang <xiyou.wangcong@gmail.com> Cc: David Rientjes <rientjes@google.com> Cc: Roland Dreier <rolandd@cisco.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memory_hotplug.c')
1 files changed, 3 insertions, 3 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index efe3e0ec2e6..821dee59637 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -413,7 +413,7 @@ int online_pages(unsigned long pfn, unsigned long nr_pages)
if (!populated_zone(zone))
need_zonelists_rebuild = 1;
- ret = walk_memory_resource(pfn, nr_pages, &onlined_pages,
+ ret = walk_system_ram_range(pfn, nr_pages, &onlined_pages,
if (ret) {
printk(KERN_DEBUG "online_pages %lx at %lx failed\n",
@@ -705,7 +705,7 @@ offline_isolated_pages_cb(unsigned long start, unsigned long nr_pages,
static void
offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn)
- walk_memory_resource(start_pfn, end_pfn - start_pfn, NULL,
+ walk_system_ram_range(start_pfn, end_pfn - start_pfn, NULL,
@@ -731,7 +731,7 @@ check_pages_isolated(unsigned long start_pfn, unsigned long end_pfn)
long offlined = 0;
int ret;
- ret = walk_memory_resource(start_pfn, end_pfn - start_pfn, &offlined,
+ ret = walk_system_ram_range(start_pfn, end_pfn - start_pfn, &offlined,
if (ret < 0)
offlined = (long)ret;