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| author | AKASHI Takahiro <takahiro.akashi@linaro.org> | 2017-04-03 11:23:54 +0900 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2017-04-05 18:26:46 +0100 |
| commit | 4c546b8a34690ca858e50f2017b8bb6e358365d1 (patch) | |
| tree | 538554955b542d534790f0aa96ff8c101baeb444 /mm | |
| parent | dffb0113d522a1410dbc136281caf7b6751ec6f4 (diff) | |
| download | linux-4c546b8a34690ca858e50f2017b8bb6e358365d1.tar.gz linux-4c546b8a34690ca858e50f2017b8bb6e358365d1.tar.bz2 linux-4c546b8a34690ca858e50f2017b8bb6e358365d1.zip | |
memblock: add memblock_clear_nomap()
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 <takahiro.akashi@linaro.org>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/memblock.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/mm/memblock.c b/mm/memblock.c index 696f06d17c4e..2f4ca8104ea4 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -805,6 +805,18 @@ 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 |