xtensa: nommu: reserve memory below PLATFORM_DEFAULT_MEM_START (566fb58e) · Commits · 戴 / test

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:

Max Filippov <jcmvbkbc@gmail.com>

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;

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