From: Dave Hansen <dave.han...@linux.intel.com>
In the process of onlining memory, we use walk_system_ram_range()
to find the actual RAM areas inside of the area being onlined.
However, it currently only finds memory resources which are
"top-level" iomem_resources. Children are not currently
searched which causes it to skip System RAM in areas like this
(in the format of /proc/iomem):
a0000000-bfffffff : Persistent Memory (legacy)
a0000000-afffffff : System RAM
Changing the true->false here allows children to be searched
as well. We need this because we add a new "System RAM"
resource underneath the "persistent memory" resource when
we use persistent memory in a volatile mode.
Signed-off-by: Dave Hansen <dave.han...@linux.intel.com>
Cc: Dan Williams <dan.j.willi...@intel.com>
Cc: Dave Jiang <dave.ji...@intel.com>
Cc: Ross Zwisler <zwis...@kernel.org>
Cc: Vishal Verma <vishal.l.ve...@intel.com>
Cc: Tom Lendacky <thomas.lenda...@amd.com>
Cc: Andrew Morton <a...@linux-foundation.org>
Cc: Michal Hocko <mho...@suse.com>
Cc: linux-nvdimm@lists.01.org
Cc: linux-ker...@vger.kernel.org
Cc: linux...@kvack.org
Cc: Huang Ying <ying.hu...@intel.com>
Cc: Fengguang Wu <fengguang...@intel.com>
Cc: Borislav Petkov <b...@suse.de>
Cc: Bjorn Helgaas <bhelg...@google.com>
Cc: Yaowei Bai <baiyao...@cmss.chinamobile.com>
Cc: Takashi Iwai <ti...@suse.de>
Cc: Jerome Glisse <jgli...@redhat.com>
---
b/kernel/resource.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff -puN kernel/resource.c~mm-walk_system_ram_range-search-child-resources
kernel/resource.c
--- a/kernel/resource.c~mm-walk_system_ram_range-search-child-resources
2019-01-24 15:13:15.482199536 -0800
+++ b/kernel/resource.c 2019-01-24 15:13:15.486199536 -0800
@@ -445,6 +445,9 @@ int walk_mem_res(u64 start, u64 end, voi
* This function calls the @func callback against all memory ranges of type
* System RAM which are marked as IORESOURCE_SYSTEM_RAM and IORESOUCE_BUSY.
* It is to be used only for System RAM.
+ *
+ * This will find System RAM ranges that are children of top-level resources
+ * in addition to top-level System RAM resources.
*/
int walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
void *arg, int (*func)(unsigned long, unsigned long,
void *))
@@ -460,7 +463,7 @@ int walk_system_ram_range(unsigned long
flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
while (start < end &&
!find_next_iomem_res(start, end, flags, IORES_DESC_NONE,
- true, &res)) {
+ false, &res)) {
pfn = (res.start + PAGE_SIZE - 1) >> PAGE_SHIFT;
end_pfn = (res.end + 1) >> PAGE_SHIFT;
if (end_pfn > pfn)
_
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