target/linux/generic/patches-4.4/100-ARM-work-around-CONFIG_CPU_SW_DOMAIN_PAN-breakage-on.patch

   1 From: Felix Fietkau <nbd@openwrt.org>
   2 Date: Tue, 19 Jan 2016 00:18:09 +0100
   3 Subject: [PATCH] ARM: work around CONFIG_CPU_SW_DOMAIN_PAN breakage on ARM11
   4  MPCore
   5
   6 Patch taken from http://www.spinics.net/lists/arm-kernel/msg450888.html
   7
   8 Signed-off-by: Felix Fietkau <nbd@openwrt.org>
   9 ---
  10
  11 --- a/arch/arm/kernel/smp_tlb.c
  12 +++ b/arch/arm/kernel/smp_tlb.c
  13 @@ -9,6 +9,7 @@
  14   */
  15  #include <linux/preempt.h>
  16  #include <linux/smp.h>
  17 +#include <linux/uaccess.h>
  18
  19  #include <asm/smp_plat.h>
  20  #include <asm/tlbflush.h>
  21 @@ -40,8 +41,11 @@ static inline void ipi_flush_tlb_mm(void
  22  static inline void ipi_flush_tlb_page(void *arg)
  23  {
  24         struct tlb_args *ta = (struct tlb_args *)arg;
  25 +       unsigned int __ua_flags = uaccess_save_and_enable();
  26
  27         local_flush_tlb_page(ta->ta_vma, ta->ta_start);
  28 +
  29 +       uaccess_restore(__ua_flags);
  30  }
  31
  32  static inline void ipi_flush_tlb_kernel_page(void *arg)
  33 @@ -54,8 +58,11 @@ static inline void ipi_flush_tlb_kernel_
  34  static inline void ipi_flush_tlb_range(void *arg)
  35  {
  36         struct tlb_args *ta = (struct tlb_args *)arg;
  37 +       unsigned int __ua_flags = uaccess_save_and_enable();
  38
  39         local_flush_tlb_range(ta->ta_vma, ta->ta_start, ta->ta_end);
  40 +
  41 +       uaccess_restore(__ua_flags);
  42  }
  43
  44  static inline void ipi_flush_tlb_kernel_range(void *arg)