This patch make sure bootmem will not allocate memory from areas that
may be ZONE_MOVABLE. The map info is from movablecore_map boot option.
Signed-off-by: Tang Chen <tangchen@xxxxxxxxxxxxxx>
Reviewed-by: Wen Congyang <wency@xxxxxxxxxxxxxx>
Tested-by: Lin Feng <linfeng@xxxxxxxxxxxxxx>
---
include/linux/memblock.h | 1 +
mm/memblock.c | 43 ++++++++++++++++++++++++++++++++++++++++---
2 files changed, 41 insertions(+), 3 deletions(-)
diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index d452ee1..6e25597 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -42,6 +42,7 @@ struct memblock {
extern struct memblock memblock;
extern int memblock_debug;
+extern struct movablecore_map movablecore_map;
#define memblock_dbg(fmt, ...) \
if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
diff --git a/mm/memblock.c b/mm/memblock.c
index 6259055..0f74c73 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -19,6 +19,7 @@
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/memblock.h>
+#include <linux/mm.h>
static struct memblock_region memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS] __initdata_memblock;
static struct memblock_region memblock_reserved_init_regions[INIT_MEMBLOCK_REGIONS] __initdata_memblock;
@@ -99,8 +100,9 @@ phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t start,
phys_addr_t end, phys_addr_t size,
phys_addr_t align, int nid)
{
- phys_addr_t this_start, this_end, cand;
+ phys_addr_t this_start, this_end, map_start, map_end, cand;
u64 i;
+ int curr = movablecore_map.nr_map;
/* pump up @end */
if (end == MEMBLOCK_ALLOC_ACCESSIBLE)
@@ -114,12 +116,47 @@ phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t start,
this_start = clamp(this_start, start, end);
this_end = clamp(this_end, start, end);
+restart:
if (this_end < size)
continue;
cand = round_down(this_end - size, align);
- if (cand >= this_start)
- return cand;
+ if (cand < this_start)
+ continue;
+
+ /*
+ * We start in reverse order to find out if [cand, this_end) is
+ * in a movablecore_map range.
+ */
+ while (--curr >= 0) {
+ map_start =
+ movablecore_map.map[curr].start << PAGE_SHIFT;
+ map_end =
+ movablecore_map.map[curr].end << PAGE_SHIFT;
+
+ /*
+ * Find the previous range of [this_start, this_end).
+ * Since memory is allocated in reverse order, we need
+ * to make sure this_end is after the end of the range.
+ */
+ if (this_end <= map_end)
+ continue;
+
+ /* [cand, this_end) and range are not overlapped. */
+ if (cand >= map_end)
+ return cand;
+ else {
+ /* Otherwise, goto the previous range. */
+ this_end = map_start;
+ goto restart;
+ }
+ }
+
+ /*
+ * If movablecore_map has not been initialized yet,
+ * just return cand.
+ */
+ return cand;
}
return 0;
}
--
1.7.1
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