static unsigned long __meminitdata dma_reserve;
#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
+/* Movable memory ranges, will also be used by memblock subsystem. */
+struct movablemem_map movablemem_map;
+
static unsigned long __meminitdata arch_zone_lowest_possible_pfn[MAX_NR_ZONES];
static unsigned long __meminitdata arch_zone_highest_possible_pfn[MAX_NR_ZONES];
static unsigned long __initdata required_kernelcore;
early_param("kernelcore", cmdline_parse_kernelcore);
early_param("movablecore", cmdline_parse_movablecore);
+/**
+ * insert_movablemem_map - Insert a memory range in to movablemem_map.map.
+ * @start_pfn: start pfn of the range
+ * @end_pfn: end pfn of the range
+ *
+ * This function will also merge the overlapped ranges, and sort the array
+ * by start_pfn in monotonic increasing order.
+ */
+static void __init insert_movablemem_map(unsigned long start_pfn,
+ unsigned long end_pfn)
+{
+ int pos, overlap;
+
+ /*
+ * pos will be at the 1st overlapped range, or the position
+ * where the element should be inserted.
+ */
+ for (pos = 0; pos < movablemem_map.nr_map; pos++)
+ if (start_pfn <= movablemem_map.map[pos].end_pfn)
+ break;
+
+ /* If there is no overlapped range, just insert the element. */
+ if (pos == movablemem_map.nr_map ||
+ end_pfn < movablemem_map.map[pos].start_pfn) {
+ /*
+ * If pos is not the end of array, we need to move all
+ * the rest elements backward.
+ */
+ if (pos < movablemem_map.nr_map)
+ memmove(&movablemem_map.map[pos+1],
+ &movablemem_map.map[pos],
+ sizeof(struct movablemem_entry) *
+ (movablemem_map.nr_map - pos));
+ movablemem_map.map[pos].start_pfn = start_pfn;
+ movablemem_map.map[pos].end_pfn = end_pfn;
+ movablemem_map.nr_map++;
+ return;
+ }
+
+ /* overlap will be at the last overlapped range */
+ for (overlap = pos + 1; overlap < movablemem_map.nr_map; overlap++)
+ if (end_pfn < movablemem_map.map[overlap].start_pfn)
+ break;
+
+ /*
+ * If there are more ranges overlapped, we need to merge them,
+ * and move the rest elements forward.
+ */
+ overlap--;
+ movablemem_map.map[pos].start_pfn = min(start_pfn,
+ movablemem_map.map[pos].start_pfn);
+ movablemem_map.map[pos].end_pfn = max(end_pfn,
+ movablemem_map.map[overlap].end_pfn);
+
+ if (pos != overlap && overlap + 1 != movablemem_map.nr_map)
+ memmove(&movablemem_map.map[pos+1],
+ &movablemem_map.map[overlap+1],
+ sizeof(struct movablemem_entry) *
+ (movablemem_map.nr_map - overlap - 1));
+
+ movablemem_map.nr_map -= overlap - pos;
+}
+
+/**
+ * movablemem_map_add_region - Add a memory range into movablemem_map.
+ * @start: physical start address of range
+ * @end: physical end address of range
+ *
+ * This function transform the physical address into pfn, and then add the
+ * range into movablemem_map by calling insert_movablemem_map().
+ */
+static void __init movablemem_map_add_region(u64 start, u64 size)
+{
+ unsigned long start_pfn, end_pfn;
+
+ /* In case size == 0 or start + size overflows */
+ if (start + size <= start)
+ return;
+
+ if (movablemem_map.nr_map >= ARRAY_SIZE(movablemem_map.map)) {
+ pr_err("movablemem_map: too many entries;"
+ " ignoring [mem %#010llx-%#010llx]\n",
+ (unsigned long long) start,
+ (unsigned long long) (start + size - 1));
+ return;
+ }
+
+ start_pfn = PFN_DOWN(start);
+ end_pfn = PFN_UP(start + size);
+ insert_movablemem_map(start_pfn, end_pfn);
+}
+
+/*
+ * cmdline_parse_movablemem_map - Parse boot option movablemem_map.
+ * @p: The boot option of the following format:
+ * movablemem_map=nn[KMG]@ss[KMG]
+ *
+ * This option sets the memory range [ss, ss+nn) to be used as movable memory.
+ *
+ * Return: 0 on success or -EINVAL on failure.
+ */
+static int __init cmdline_parse_movablemem_map(char *p)
+{
+ char *oldp;
+ u64 start_at, mem_size;
+
+ if (!p)
+ goto err;
+
+ oldp = p;
+ mem_size = memparse(p, &p);
+ if (p == oldp)
+ goto err;
+
+ if (*p == '@') {
+ oldp = ++p;
+ start_at = memparse(p, &p);
+ if (p == oldp || *p != '\0')
+ goto err;
+
+ movablemem_map_add_region(start_at, mem_size);
+ return 0;
+ }
+err:
+ return -EINVAL;
+}
+early_param("movablemem_map", cmdline_parse_movablemem_map);
+
#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
/**
* deltas controls asynch page reclaim, and so should
* not be capped for highmem.
*/
- int min_pages;
+ unsigned long min_pages;
min_pages = zone->present_pages / 1024;
- if (min_pages < SWAP_CLUSTER_MAX)
- min_pages = SWAP_CLUSTER_MAX;
- if (min_pages > 128)
- min_pages = 128;
+ min_pages = clamp(min_pages, SWAP_CLUSTER_MAX, 128UL);
zone->watermark[WMARK_MIN] = min_pages;
} else {
/*
0, false, MIGRATE_SYNC,
MR_CMA);
}
-
- putback_movable_pages(&cc->migratepages);
- return ret > 0 ? 0 : ret;
+ if (ret < 0) {
+ putback_movable_pages(&cc->migratepages);
+ return ret;
+ }
+ return 0;
}
/**
projects / platform / adaptation / renesas_rcar / renesas_kernel.git / blobdiff