[PATCH 3/5] mm: nobootmem: implement reserve_bootmem() in terms of memblock.
From: Avery Pennarun <hidden>
Date: 2012-03-13 05:36:58
Also in:
lkml
Subsystem:
memory management, the rest · Maintainers:
Andrew Morton, Linus Torvalds
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 <redacted> --- 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@kvack.org. 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@kvack.org"> email@kvack.org </a>