Merge tag 'arm64-stable' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux-aarch64

Pull ARM64 fixes from Catalin Marinas:
 - Remove preempt_count modifications in the arm64 IRQ handling code
   since that's already dealt with in generic irq_enter/irq_exit
 - PTE_PROT_NONE bit moved higher up to avoid overlapping with the
   hardware bits (for PROT_NONE mappings which are pte_present)
 - Big-endian fixes for ptrace support
 - Asynchronous aborts unmasking while in the kernel
 - pgprot_writecombine() change to create Normal NonCacheable memory
   rather than Device GRE

* tag 'arm64-stable' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux-aarch64:
  arm64: Move PTE_PROT_NONE higher up
  arm64: Use Normal NonCacheable memory for writecombine
  arm64: debug: make aarch32 bkpt checking endian clean
  arm64: ptrace: fix compat registes get/set to be endian clean
  arm64: Unmask asynchronous aborts when in kernel mode
  arm64: dts: Reserve the memory used for secondary CPU release address
  arm64: let the core code deal with preempt_count

8 files changed, 67 insertions, 66 deletions

diff --git a/arch/arm64/boot/dts/foundation-v8.dts b/arch/arm64/boot/dts/foundation-v8.dts
index 84fcc5018284..519c4b2c0687 100644
--- a/arch/arm64/boot/dts/foundation-v8.dts
+++ b/arch/arm64/boot/dts/foundation-v8.dts
@@ -6,6 +6,8 @@
 
 /dts-v1/;
 
+/memreserve/ 0x80000000 0x00010000;
+
 / {
         model = "Foundation-v8A";
         compatible = "arm,foundation-aarch64", "arm,vexpress";
diff --git a/arch/arm64/include/asm/irqflags.h b/arch/arm64/include/asm/irqflags.h
index aa11943b8502..b2fcfbc51ecc 100644
--- a/arch/arm64/include/asm/irqflags.h
+++ b/arch/arm64/include/asm/irqflags.h
@@ -56,6 +56,9 @@ static inline void arch_local_irq_disable(void)
 #define local_fiq_enable()      asm("msr        daifclr, #1" : : : "memory")
 #define local_fiq_disable()     asm("msr        daifset, #1" : : : "memory")
 
+#define local_async_enable()    asm("msr        daifclr, #4" : : : "memory")
+#define local_async_disable()   asm("msr        daifset, #4" : : : "memory")
+
 /*
  * Save the current interrupt enable state.
  */
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 17bd3af0a117..7f2b60affbb4 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -25,10 +25,11 @@
  * Software defined PTE bits definition.
  */
 #define PTE_VALID               (_AT(pteval_t, 1) << 0)
-#define PTE_PROT_NONE           (_AT(pteval_t, 1) << 2) /* only when !PTE_VALID */
-#define PTE_FILE                (_AT(pteval_t, 1) << 3) /* only when !pte_present() */
+#define PTE_FILE                (_AT(pteval_t, 1) << 2) /* only when !pte_present() */
 #define PTE_DIRTY               (_AT(pteval_t, 1) << 55)
 #define PTE_SPECIAL             (_AT(pteval_t, 1) << 56)
+                                /* bit 57 for PMD_SECT_SPLITTING */
+#define PTE_PROT_NONE           (_AT(pteval_t, 1) << 58) /* only when !PTE_VALID */
 
 /*
  * VMALLOC and SPARSEMEM_VMEMMAP ranges.
@@ -254,7 +255,7 @@ static inline int has_transparent_hugepage(void)
 #define pgprot_noncached(prot) \
         __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_nGnRnE))
 #define pgprot_writecombine(prot) \
-        __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_GRE))
+        __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_NORMAL_NC))
 #define pgprot_dmacoherent(prot) \
         __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_NORMAL_NC))
 #define __HAVE_PHYS_MEM_ACCESS_PROT
@@ -357,18 +358,20 @@ extern pgd_t idmap_pg_dir[PTRS_PER_PGD];
 
 /*
  * Encode and decode a swap entry:
- *      bits 0, 2:      present (must both be zero)
- *      bit  3:         PTE_FILE
- *      bits 4-8:       swap type
- *      bits 9-63:      swap offset
+ *      bits 0-1:       present (must be zero)
+ *      bit  2:         PTE_FILE
+ *      bits 3-8:       swap type
+ *      bits 9-57:      swap offset
  */
-#define __SWP_TYPE_SHIFT        4
+#define __SWP_TYPE_SHIFT        3
 #define __SWP_TYPE_BITS         6
+#define __SWP_OFFSET_BITS       49
 #define __SWP_TYPE_MASK         ((1 << __SWP_TYPE_BITS) - 1)
 #define __SWP_OFFSET_SHIFT      (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT)
+#define __SWP_OFFSET_MASK       ((1UL << __SWP_OFFSET_BITS) - 1)
 
 #define __swp_type(x)           (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK)
-#define __swp_offset(x)         ((x).val >> __SWP_OFFSET_SHIFT)
+#define __swp_offset(x)         (((x).val >> __SWP_OFFSET_SHIFT) & __SWP_OFFSET_MASK)
 #define __swp_entry(type,offset) ((swp_entry_t) { ((type) << __SWP_TYPE_SHIFT) | ((offset) << __SWP_OFFSET_SHIFT) })
 
 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
@@ -382,15 +385,15 @@ extern pgd_t idmap_pg_dir[PTRS_PER_PGD];
 
 /*
  * Encode and decode a file entry:
- *      bits 0, 2:      present (must both be zero)
- *      bit  3:         PTE_FILE
- *      bits 4-63:      file offset / PAGE_SIZE
+ *      bits 0-1:       present (must be zero)
+ *      bit  2:         PTE_FILE
+ *      bits 3-57:      file offset / PAGE_SIZE
  */
 #define pte_file(pte)           (pte_val(pte) & PTE_FILE)
-#define pte_to_pgoff(x)         (pte_val(x) >> 4)
-#define pgoff_to_pte(x)         __pte(((x) << 4) | PTE_FILE)
+#define pte_to_pgoff(x)         (pte_val(x) >> 3)
+#define pgoff_to_pte(x)         __pte(((x) << 3) | PTE_FILE)
 
-#define PTE_FILE_MAX_BITS       60
+#define PTE_FILE_MAX_BITS       55
 
 extern int kern_addr_valid(unsigned long addr);
 
diff --git a/arch/arm64/kernel/debug-monitors.c b/arch/arm64/kernel/debug-monitors.c
index 6a0a9b132d7a..4ae68579031d 100644
--- a/arch/arm64/kernel/debug-monitors.c
+++ b/arch/arm64/kernel/debug-monitors.c
@@ -248,7 +248,8 @@ static int brk_handler(unsigned long addr, unsigned int esr,
 int aarch32_break_handler(struct pt_regs *regs)
 {
         siginfo_t info;
-        unsigned int instr;
+        u32 arm_instr;
+        u16 thumb_instr;
         bool bp = false;
         void __user *pc = (void __user *)instruction_pointer(regs);
 
@@ -257,18 +258,21 @@ int aarch32_break_handler(struct pt_regs *regs)
 
         if (compat_thumb_mode(regs)) {
                 /* get 16-bit Thumb instruction */
-                get_user(instr, (u16 __user *)pc);
-                if (instr == AARCH32_BREAK_THUMB2_LO) {
+                get_user(thumb_instr, (u16 __user *)pc);
+                thumb_instr = le16_to_cpu(thumb_instr);
+                if (thumb_instr == AARCH32_BREAK_THUMB2_LO) {
                         /* get second half of 32-bit Thumb-2 instruction */
-                        get_user(instr, (u16 __user *)(pc + 2));
-                        bp = instr == AARCH32_BREAK_THUMB2_HI;
+                        get_user(thumb_instr, (u16 __user *)(pc + 2));
+                        thumb_instr = le16_to_cpu(thumb_instr);
+                        bp = thumb_instr == AARCH32_BREAK_THUMB2_HI;
                 } else {
-                        bp = instr == AARCH32_BREAK_THUMB;
+                        bp = thumb_instr == AARCH32_BREAK_THUMB;
                 }
         } else {
                 /* 32-bit ARM instruction */
-                get_user(instr, (u32 __user *)pc);
-                bp = (instr & ~0xf0000000) == AARCH32_BREAK_ARM;
+                get_user(arm_instr, (u32 __user *)pc);
+                arm_instr = le32_to_cpu(arm_instr);
+                bp = (arm_instr & ~0xf0000000) == AARCH32_BREAK_ARM;
         }
 
         if (!bp)
diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
index e1166145ca29..4d2c6f3f0c41 100644
--- a/arch/arm64/kernel/entry.S
+++ b/arch/arm64/kernel/entry.S
@@ -309,15 +309,12 @@ el1_irq:
 #ifdef CONFIG_TRACE_IRQFLAGS
         bl      trace_hardirqs_off
 #endif
-#ifdef CONFIG_PREEMPT
-        get_thread_info tsk
-        ldr     w24, [tsk, #TI_PREEMPT]         // get preempt count
-        add     w0, w24, #1                     // increment it
-        str     w0, [tsk, #TI_PREEMPT]
-#endif
+
         irq_handler
+
 #ifdef CONFIG_PREEMPT
-        str     w24, [tsk, #TI_PREEMPT]         // restore preempt count
+        get_thread_info tsk
+        ldr     w24, [tsk, #TI_PREEMPT]         // restore preempt count
         cbnz    w24, 1f                         // preempt count != 0
         ldr     x0, [tsk, #TI_FLAGS]            // get flags
         tbz     x0, #TIF_NEED_RESCHED, 1f       // needs rescheduling?
@@ -507,22 +504,10 @@ el0_irq_naked:
 #ifdef CONFIG_TRACE_IRQFLAGS
         bl      trace_hardirqs_off
 #endif
-        get_thread_info tsk
-#ifdef CONFIG_PREEMPT
-        ldr     w24, [tsk, #TI_PREEMPT]         // get preempt count
-        add     w23, w24, #1                    // increment it
-        str     w23, [tsk, #TI_PREEMPT]
-#endif
+
         irq_handler
-#ifdef CONFIG_PREEMPT
-        ldr     w0, [tsk, #TI_PREEMPT]
-        str     w24, [tsk, #TI_PREEMPT]
-        cmp     w0, w23
-        b.eq    1f
-        mov     x1, #0
-        str     x1, [x1]                        // BUG
-1:
-#endif
+        get_thread_info tsk
+
 #ifdef CONFIG_TRACE_IRQFLAGS
         bl      trace_hardirqs_on
 #endif
diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c
index fecdbf7de82e..6777a2192b83 100644
--- a/arch/arm64/kernel/ptrace.c
+++ b/arch/arm64/kernel/ptrace.c
@@ -636,28 +636,27 @@ static int compat_gpr_get(struct task_struct *target,
 
         for (i = 0; i < num_regs; ++i) {
                 unsigned int idx = start + i;
-                void *reg;
+                compat_ulong_t reg;
 
                 switch (idx) {
                 case 15:
-                        reg = (void *)&task_pt_regs(target)->pc;
+                        reg = task_pt_regs(target)->pc;
                         break;
                 case 16:
-                        reg = (void *)&task_pt_regs(target)->pstate;
+                        reg = task_pt_regs(target)->pstate;
                         break;
                 case 17:
-                        reg = (void *)&task_pt_regs(target)->orig_x0;
+                        reg = task_pt_regs(target)->orig_x0;
                         break;
                 default:
-                        reg = (void *)&task_pt_regs(target)->regs[idx];
+                        reg = task_pt_regs(target)->regs[idx];
                 }
 
-                ret = copy_to_user(ubuf, reg, sizeof(compat_ulong_t));
-
+                ret = copy_to_user(ubuf, &reg, sizeof(reg));
                 if (ret)
                         break;
-                else
-                        ubuf += sizeof(compat_ulong_t);
+
+                ubuf += sizeof(reg);
         }
 
         return ret;
@@ -685,28 +684,28 @@ static int compat_gpr_set(struct task_struct *target,
 
         for (i = 0; i < num_regs; ++i) {
                 unsigned int idx = start + i;
-                void *reg;
+                compat_ulong_t reg;
+
+                ret = copy_from_user(&reg, ubuf, sizeof(reg));
+                if (ret)
+                        return ret;
+
+                ubuf += sizeof(reg);
 
                 switch (idx) {
                 case 15:
-                        reg = (void *)&newregs.pc;
+                        newregs.pc = reg;
                         break;
                 case 16:
-                        reg = (void *)&newregs.pstate;
+                        newregs.pstate = reg;
                         break;
                 case 17:
-                        reg = (void *)&newregs.orig_x0;
+                        newregs.orig_x0 = reg;
                         break;
                 default:
-                        reg = (void *)&newregs.regs[idx];
+                        newregs.regs[idx] = reg;
                 }
 
-                ret = copy_from_user(reg, ubuf, sizeof(compat_ulong_t));
-
-                if (ret)
-                        goto out;
-                else
-                        ubuf += sizeof(compat_ulong_t);
         }
 
         if (valid_user_regs(&newregs.user_regs))
@@ -714,7 +713,6 @@ static int compat_gpr_set(struct task_struct *target,
         else
                 ret = -EINVAL;
 
-out:
         return ret;
 }
 
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index 0bc5e4cbc017..bd9bbd0e44ed 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -205,6 +205,11 @@ u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID };
 
 void __init setup_arch(char **cmdline_p)
 {
+        /*
+         * Unmask asynchronous aborts early to catch possible system errors.
+         */
+        local_async_enable();
+
         setup_processor();
 
         setup_machine_fdt(__fdt_pointer);
diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index a5aeefab03c3..a0c2ca602cf8 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -160,6 +160,7 @@ asmlinkage void secondary_start_kernel(void)
 
         local_irq_enable();
         local_fiq_enable();
+        local_async_enable();
 
         /*
          * OK, it's off to the idle thread for us