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| author |   Vladimir Murzin <vladimir.murzin@arm.com> | 2017-12-01 10:19:11 +0100 |
|---|---|---|
| committer |   Russell King <rmk+kernel@armlinux.org.uk> | 2017-12-17 22:16:19 +0000 |
| commit | 7710cc691cfc5ad457173944d989875a6e79d238 (patch) | |
| tree | b68740ba838b4d70eae8c09581f966eeb5017434 /arch/arm/mm | |
| parent | ARM: 8727/1: MAINTAINERS: Update brcmstb entries to cover B15 code (diff) | |
| download | linux-dev-7710cc691cfc5ad457173944d989875a6e79d238.tar.xz linux-dev-7710cc691cfc5ad457173944d989875a6e79d238.zip | |
ARM: 8732/1: NOMMU: Allow userspace to access background MPU region
Currently, with MPU enabled, we prohibit userspace access to anything
except RAM. Benjamin, reported that because of that his userspace
application cannot access framebuffer's memory he reserved in device
tree. It turns out we have no option other than to allow userspace
access memory covered by background region.
Reported-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Tested-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'arch/arm/mm')
| -rw-r--r-- | arch/arm/mm/pmsa-v7.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/mm/pmsa-v7.c b/arch/arm/mm/pmsa-v7.c index 976df60ac426..650998912c1c 100644 --- a/arch/arm/mm/pmsa-v7.c +++ b/arch/arm/mm/pmsa-v7.c @@ -433,7 +433,7 @@ void __init mpu_setup(void) /* Background */ err |= mpu_setup_region(region++, 0, 32, - MPU_ACR_XN | MPU_RGN_STRONGLY_ORDERED | MPU_AP_PL1RW_PL0NA, + MPU_ACR_XN | MPU_RGN_STRONGLY_ORDERED | MPU_AP_PL1RW_PL0RW, 0, false); #ifdef CONFIG_XIP_KERNEL |