Commit 4c546b8a authored by AKASHI Takahiro's avatar AKASHI Takahiro Committed by Catalin Marinas

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: default avatarAKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent dffb0113
...@@ -93,6 +93,7 @@ int memblock_mark_hotplug(phys_addr_t base, phys_addr_t size); ...@@ -93,6 +93,7 @@ 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_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_mirror(phys_addr_t base, phys_addr_t size);
int memblock_mark_nomap(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); ulong choose_memblock_flags(void);
/* Low level functions */ /* Low level functions */
......
...@@ -804,6 +804,18 @@ int __init_memblock memblock_mark_nomap(phys_addr_t base, phys_addr_t size) ...@@ -804,6 +804,18 @@ int __init_memblock memblock_mark_nomap(phys_addr_t base, phys_addr_t size)
return memblock_setclr_flag(base, size, 1, MEMBLOCK_NOMAP); return memblock_setclr_flag(base, size, 1, MEMBLOCK_NOMAP);
} }
/**
* 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() * __next_reserved_mem_region - next function for for_each_reserved_region()
* @idx: pointer to u64 loop variable * @idx: pointer to u64 loop variable
......
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