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

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

include/linux/memblock.h

+1 −0
Original line number Diff line number Diff line
@@ -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_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 */

mm/memblock.c

+12 −0
Original line number Diff line number Diff line
@@ -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);

}



/**

 * 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

CRA Git | Maintained and supported by SUSTech CRA and CCSE