[PATCH v32 01/13] memblock: add memblock_clear_nomap()
From: AKASHI Takahiro <hidden>
Date: 2017-02-07 08:06:44
Also in:
kexec, linux-mm
Subsystem:
memblock and memory management initialization, memory management, the rest · Maintainers:
Mike Rapoport, Andrew Morton, Linus Torvalds
This function, with a combination of memblock_mark_nomap(), will be used in a later kdump patch for arm64 when it temporarily isolates some range of memory from the other memory blocks in order to create a specific kernel mapping at boot time. Signed-off-by: AKASHI Takahiro <redacted> --- include/linux/memblock.h | 1 + mm/memblock.c | 12 ++++++++++++ 2 files changed, 13 insertions(+)
diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index 5b759c9acf97..5f7825752b15 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h@@ -92,6 +92,7 @@ int memblock_mark_hotplug(phys_addr_t base, phys_addr_t size); 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); ulong choose_memblock_flags(void); /* Low level functions */
diff --git a/mm/memblock.c b/mm/memblock.c
index 7608bc305936..07c85ec2c035 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c@@ -814,6 +814,18 @@ int __init_memblock memblock_mark_nomap(phys_addr_t base, phys_addr_t size) } /** + * memblock_clear_nomap - Clear flag MEMBLOCK_NOMAP 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_nomap(phys_addr_t base, phys_addr_t size) +{ + return memblock_setclr_flag(base, size, 0, MEMBLOCK_NOMAP); +} + +/** * __next_reserved_mem_region - next function for for_each_reserved_region() * @idx: pointer to u64 loop variable * @out_start: ptr to phys_addr_t for start address of the region, can be %NULL
--
2.11.1