Commit 636e645f authored Jan 03, 2018 by Vladimir Murzin Committed by Russell King Jan 21, 2018

ARM: 8740/1: NOMMU: Make sure we do not hold stale data in mem[] array



adjust_lowmem_bounds() called twice which can lead to stalled data
(i.e. subreg) value in mem[] array after the first call.

Zero out mem[] array before we allocate MPU regions for memory.

Fixes: 5c9d9a1b ("ARM: 8712/1: NOMMU: Use more MPU regions to cover memory")
Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

parent 62d1c95d

arch/arm/mm/pmsa-v7.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -6,6 +6,7 @@

		#include <linux/bitops.h>
		#include <linux/memblock.h>
		#include <linux/string.h>

		#include <asm/cacheflush.h>
		#include <asm/cp15.h>
		@@ -296,6 +297,7 @@ void __init adjust_lowmem_bounds_mpu(void)
		}
		}

		memset(mem, 0, sizeof(mem));
		num = allocate_region(mem_start, specified_mem_size, mem_max_regions, mem);

		for (i = 0; i < num; i++) {