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| author | AKASHI Takahiro <takahiro.akashi@linaro.org> | 2017-04-03 02:23:54 (GMT) |
|---|---|---|
| committer | AKASHI Takahiro <takahiro.akashi@linaro.org> | 2017-06-08 09:39:16 (GMT) |
| commit | 3acb7bc37d56d5dc80112459c0d72c6be8bde3c9 (patch) | |
| tree | a6a0671add3ced365b02c4ca175bca72720e6767 /mm | |
| parent | f1aa865ae5d4608cbfbb02f42baa1ef5ed95fce2 (diff) | |
| download | linux-3acb7bc37d56d5dc80112459c0d72c6be8bde3c9.tar.xz | |
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 68849d0..183fd46 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 |