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

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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: 5c9d9a1b3a ("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>
This commit is contained in:
Vladimir Murzin 2018-01-03 10:09:33 +01:00 committed by Russell King
parent 62d1c95d57
commit 636e645f1f
1 changed files with 2 additions and 0 deletions
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arch/arm/mm/pmsa-v7.c
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@ -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++) {