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Revert "kernel: work around CONFIG_CPU_SW_DOMAIN_PAN breakage on ARM11 MPCore"

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This reverts commit r48335

The workaround is incomplete and cannot cover all possible cases. The
only real solution to this problem is to disable this feature on
ARM11MPcore entirely.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 48460
This commit is contained in:
Felix Fietkau 2016-01-23 18:02:55 +00:00
parent eb39f41ffd
commit 84a7bc3d57
1 changed files with 0 additions and 44 deletions
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44
target/linux/generic/patches-4.4/100-ARM-work-around-CONFIG_CPU_SW_DOMAIN_PAN-breakage-on.patch
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@ -1,44 +0,0 @@
From: Felix Fietkau <nbd@openwrt.org>
Date: Tue, 19 Jan 2016 00:18:09 +0100
Subject: [PATCH] ARM: work around CONFIG_CPU_SW_DOMAIN_PAN breakage on ARM11
MPCore
Patch taken from http://www.spinics.net/lists/arm-kernel/msg450888.html
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
---
--- a/arch/arm/kernel/smp_tlb.c
+++ b/arch/arm/kernel/smp_tlb.c
@@ -9,6 +9,7 @@
*/
#include <linux/preempt.h>
#include <linux/smp.h>
+#include <linux/uaccess.h>
#include <asm/smp_plat.h>
#include <asm/tlbflush.h>
@@ -40,8 +41,11 @@ static inline void ipi_flush_tlb_mm(void
static inline void ipi_flush_tlb_page(void *arg)
{
struct tlb_args *ta = (struct tlb_args *)arg;
+ unsigned int __ua_flags = uaccess_save_and_enable();
local_flush_tlb_page(ta->ta_vma, ta->ta_start);
+
+ uaccess_restore(__ua_flags);
}
static inline void ipi_flush_tlb_kernel_page(void *arg)
@@ -54,8 +58,11 @@ static inline void ipi_flush_tlb_kernel_
static inline void ipi_flush_tlb_range(void *arg)
{
struct tlb_args *ta = (struct tlb_args *)arg;
+ unsigned int __ua_flags = uaccess_save_and_enable();
local_flush_tlb_range(ta->ta_vma, ta->ta_start, ta->ta_end);
+
+ uaccess_restore(__ua_flags);
}
static inline void ipi_flush_tlb_kernel_range(void *arg)