There was an implementation for it in mm/bootmem.c, but it was left out of
nobootmem.c, and we can easily write a memblock implementation. That way
code (eg. printk) that wants to reserve memory early on can just always
call bootmem on all platforms.
Signed-off-by: Avery Pennarun <apenwarr@xxxxxxxxx>
---
mm/nobootmem.c | 23 +++++++++++++++++++++++
1 files changed, 23 insertions(+), 0 deletions(-)
diff --git a/mm/nobootmem.c b/mm/nobootmem.c
index 24f0fc1..2c269da 100644
--- a/mm/nobootmem.c
+++ b/mm/nobootmem.c
@@ -193,6 +193,29 @@ void __init free_bootmem(unsigned long addr, unsigned long size)
memblock_free(addr, size);
}
+/**
+ * reserve_bootmem - mark a page range as reserved
+ * @addr: starting address of the range
+ * @size: size of the range in bytes
+ * @flags: reservation flags (see linux/bootmem.h)
+ *
+ * Partial pages will be reserved.
+ *
+ * The range must be contiguous but may span node boundaries.
+ */
+int __init reserve_bootmem(unsigned long addr, unsigned long size,
+ int flags)
+{
+ if (flags & BOOTMEM_EXCLUSIVE) {
+ phys_addr_t m = memblock_find_in_range(addr, addr + size,
+ size, PAGE_SIZE);
+ if (m != addr)
+ return -EBUSY;
+ }
+ memblock_reserve(addr, size);
+ return 0;
+}
+
static void * __init ___alloc_bootmem_nopanic(unsigned long size,
unsigned long align,
unsigned long goal,
--
1.7.7.3
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@xxxxxxxxx. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/
Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>