diff options
| author | Dave Hansen <dave.hansen@linux.intel.com> | 2019-02-25 19:57:38 +0100 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2019-02-28 19:41:23 +0100 |
| commit | 2b539aefe9e48e3908cff02699aa63a8b9bd268e (patch) | |
| tree | 49caae2c125235e52eaa223f9b8b90cd85db3d07 /kernel/resource.c | |
| parent | mm/memory-hotplug: Allow memory resources to be children (diff) | |
| download | linux-2b539aefe9e48e3908cff02699aa63a8b9bd268e.tar.xz linux-2b539aefe9e48e3908cff02699aa63a8b9bd268e.zip | |
mm/resource: Let walk_system_ram_range() search child resources
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.hansen@linux.intel.com>
Cc: Keith Busch <keith.busch@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Ross Zwisler <zwisler@kernel.org>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: linux-nvdimm@lists.01.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-mm@kvack.org
Cc: Huang Ying <ying.huang@intel.com>
Cc: Fengguang Wu <fengguang.wu@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Yaowei Bai <baiyaowei@cmss.chinamobile.com>
Cc: Takashi Iwai <tiwai@suse.de>
Cc: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'kernel/resource.c')
| -rw-r--r-- | kernel/resource.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/kernel/resource.c b/kernel/resource.c index 35fe105d581e..e7f9d2a5db25 100644 --- a/kernel/resource.c +++ b/kernel/resource.c @@ -454,6 +454,9 @@ int walk_mem_res(u64 start, u64 end, void *arg, * 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 *)) @@ -469,7 +472,7 @@ int walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages, 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) |