On 08/01/16 08:26, Taku Izumi wrote:
This patch extends existing "kernelcore" option and introduces
kernelcore=mirror option. By specifying "mirror" instead of specifying
the amount of memory, non-mirrored (non-reliable) region will be arranged
into ZONE_MOVABLE.
v1 -> v2:
- Refine so that the following case also can be
handled properly:
Node X: |MMMMMM------MMMMMM--------|
(legend) M: mirrored -: not mirrrored
In this case, ZONE_NORMAL and ZONE_MOVABLE are
arranged like bellow:
Node X: |MMMMMM------MMMMMM--------|
|ooooooxxxxxxooooooxxxxxxxx| ZONE_NORMAL
|ooooooxxxxxxoooooooo| ZONE_MOVABLE
(legend) o: present x: absent
v2 -> v3:
- Fix build with CONFIG_HAVE_MEMBLOCK_NODE_MAP=n
- No functional change in case of CONFIG_HAVE_MEMBLOCK_NODE_MAP=y
Signed-off-by: Taku Izumi <izumi.taku@xxxxxxxxxxxxxx>
---
Documentation/kernel-parameters.txt | 12 +++-
mm/page_alloc.c | 114 ++++++++++++++++++++++++++++++++++--
2 files changed, 119 insertions(+), 7 deletions(-)
[...]
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index efb8996..b528328 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -260,6 +260,7 @@ static unsigned long __meminitdata arch_zone_highest_possible_pfn[MAX_NR_ZONES];
static unsigned long __initdata required_kernelcore;
static unsigned long __initdata required_movablecore;
static unsigned long __meminitdata zone_movable_pfn[MAX_NUMNODES];
+static bool mirrored_kernelcore;
/* movable_zone is the "real" zone pages in ZONE_MOVABLE are taken from */
int movable_zone;
@@ -4613,6 +4614,9 @@ void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone,
unsigned long pfn;
struct zone *z;
unsigned long nr_initialised = 0;
+#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
+ struct memblock_region *r = NULL, *tmp;
+#endif
if (highest_memmap_pfn < end_pfn - 1)
highest_memmap_pfn = end_pfn - 1;
@@ -4639,6 +4643,40 @@ void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone,
if (!update_defer_init(pgdat, pfn, end_pfn,
&nr_initialised))
break;
+
+ /*
+ * if not mirrored_kernelcore and ZONE_MOVABLE exists,
+ * range from zone_movable_pfn[nid] to end of each node
+ * should be ZONE_MOVABLE not ZONE_NORMAL. skip it.
+ */
+ if (!mirrored_kernelcore && zone_movable_pfn[nid])
+ if (zone == ZONE_NORMAL &&
+ pfn >= zone_movable_pfn[nid])
+ continue;
+
I tried this with today's -next, the above lines gave compilation error.
Moved them below into HAVE_MEMBLOCK_NODE_MAP and tested it on ARM64.
I don't see the previous backtraces. Let me know if that's correct or
you can post a version that compiles correctly and I can give a try.
+#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
+ /*
+ * check given memblock attribute by firmware which
+ * can affect kernel memory layout.
+ * if zone==ZONE_MOVABLE but memory is mirrored,
+ * it's an overlapped memmap init. skip it.
+ */
+ if (mirrored_kernelcore && zone == ZONE_MOVABLE) {
+ if (!r ||
+ pfn >= memblock_region_memory_end_pfn(r)) {
+ for_each_memblock(memory, tmp)
+ if (pfn < memblock_region_memory_end_pfn(tmp))
+ break;
+ r = tmp;
+ }
+ if (pfn >= memblock_region_memory_base_pfn(r) &&
+ memblock_is_mirror(r)) {
+ /* already initialized as NORMAL */
+ pfn = memblock_region_memory_end_pfn(r);
+ continue;
+ }
+ }
+#endif
}
--
Regards,
Sudeep
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