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Commit 566fb58e authored by Max Filippov's avatar Max Filippov
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xtensa: nommu: reserve memory below PLATFORM_DEFAULT_MEM_START 



Memory accounting code can't handle pages below
PLATFORM_DEFAULT_MEM_START. Reserve those pages if they exist.
When PLATFORM_DEFAULT_MEM_START is zero reserve one page at address 0 to
make sure that successfull memory allocations don't return NULL.

Signed-off-by: default avatarMax Filippov <jcmvbkbc@gmail.com>
parent 2eabc180

arch/xtensa/mm/init.c

+11 −0
Original line number Diff line number Diff line
@@ -239,6 +239,17 @@ void __init bootmem_init(void) 
	unsigned long bootmap_start, bootmap_size;

	int i;



	/* Reserve all memory below PLATFORM_DEFAULT_MEM_START, as memory

	 * accounting doesn't work for pages below that address.

	 *

	 * If PLATFORM_DEFAULT_MEM_START is zero reserve page at address 0:

	 * successfull allocations should never return NULL.

	 */

	if (PLATFORM_DEFAULT_MEM_START)

		mem_reserve(0, PLATFORM_DEFAULT_MEM_START, 0);

	else

		mem_reserve(0, 1, 0);



	sysmem_dump();

	max_low_pfn = max_pfn = 0;

	min_low_pfn = ~0;