The MEMBLOCK_MOVABLE flag is introduced to designate a memblock
as only supporting movable allocations by the page allocator.
Signed-off-by: Doug Berger <opendmb@xxxxxxxxx>
---
include/linux/memblock.h | 8 ++++++++
mm/memblock.c | 24 ++++++++++++++++++++++++
2 files changed, 32 insertions(+)
diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index 50ad19662a32..8eb3ca32dfa7 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -47,6 +47,7 @@ enum memblock_flags {
MEMBLOCK_MIRROR = 0x2, /* mirrored region */
MEMBLOCK_NOMAP = 0x4, /* don't add to kernel direct mapping */
MEMBLOCK_DRIVER_MANAGED = 0x8, /* always detected via a driver */
+ MEMBLOCK_MOVABLE = 0x10, /* designated movable block */
};
/**
@@ -125,6 +126,8 @@ int memblock_clear_hotplug(phys_addr_t base, phys_addr_t size);
int memblock_mark_mirror(phys_addr_t base, phys_addr_t size);
int memblock_mark_nomap(phys_addr_t base, phys_addr_t size);
int memblock_clear_nomap(phys_addr_t base, phys_addr_t size);
+int memblock_mark_movable(phys_addr_t base, phys_addr_t size);
+int memblock_clear_movable(phys_addr_t base, phys_addr_t size);
void memblock_free_all(void);
void memblock_free(void *ptr, size_t size);
@@ -265,6 +268,11 @@ static inline bool memblock_is_driver_managed(struct memblock_region *m)
return m->flags & MEMBLOCK_DRIVER_MANAGED;
}
+static inline bool memblock_is_movable(struct memblock_region *m)
+{
+ return m->flags & MEMBLOCK_MOVABLE;
+}
+
int memblock_search_pfn_nid(unsigned long pfn, unsigned long *start_pfn,
unsigned long *end_pfn);
void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn,
diff --git a/mm/memblock.c b/mm/memblock.c
index 511d4783dcf1..46a4deb07d92 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -979,6 +979,30 @@ int __init_memblock memblock_clear_nomap(phys_addr_t base, phys_addr_t size)
return memblock_setclr_flag(base, size, 0, MEMBLOCK_NOMAP);
}
+/**
+ * memblock_mark_movable - Mark designated movable block with MEMBLOCK_MOVABLE.
+ * @base: the base phys addr of the region
+ * @size: the size of the region
+ *
+ * Return: 0 on success, -errno on failure.
+ */
+int __init_memblock memblock_mark_movable(phys_addr_t base, phys_addr_t size)
+{
+ return memblock_setclr_flag(base, size, 1, MEMBLOCK_MOVABLE);
+}
+
+/**
+ * memblock_clear_movable - Clear flag MEMBLOCK_MOVABLE for a specified region.
+ * @base: the base phys addr of the region
+ * @size: the size of the region
+ *
+ * Return: 0 on success, -errno on failure.
+ */
+int __init_memblock memblock_clear_movable(phys_addr_t base, phys_addr_t size)
+{
+ return memblock_setclr_flag(base, size, 0, MEMBLOCK_MOVABLE);
+}
+
static bool should_skip_region(struct memblock_type *type,
struct memblock_region *m,
int nid, int flags)
--
2.25.1
