Commit e89ef66d authored Nov 23, 2016 by Marcin Nowakowski Committed by Ralf Baechle Jan 03, 2017

MIPS: init: Ensure reserved memory regions are not added to bootmem



Memories managed through boot_mem_map are generally expected to define
non-crossing areas. However, if part of a larger memory block is marked
as reserved, it would still be added to bootmem allocator as an
available block and could end up being overwritten by the allocator.

Prevent this by explicitly marking the memory as reserved it if exists
in the range used by bootmem allocator.

Signed-off-by: Marcin Nowakowski <marcin.nowakowski@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14608/


Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

parent 269aa43a

arch/mips/kernel/setup.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -483,6 +483,10 @@ static void __init bootmem_init(void)
		continue;
		default:
		/* Not usable memory */
		if (start > min_low_pfn && end < max_low_pfn)
		reserve_bootmem(boot_mem_map.map[i].addr,
		boot_mem_map.map[i].size,
		BOOTMEM_DEFAULT);
		continue;
		}

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