9 files changed, 100 insertions, 8 deletions

diff --git a/arch/avr32/kernel/.gitignore b/arch/avr32/kernel/.gitignore
new file mode 100644
index 000000000000..c5f676c3c224
--- /dev/null
+++ b/arch/avr32/kernel/.gitignore
@@ -0,0 +1 @@
+vmlinux.lds
diff --git a/arch/avr32/kernel/asm-offsets.c b/arch/avr32/kernel/asm-offsets.c
index e4796c67a831..d6a8193a1d2f 100644
--- a/arch/avr32/kernel/asm-offsets.c
+++ b/arch/avr32/kernel/asm-offsets.c
@@ -4,6 +4,8 @@
  * to extract and format the required data.
  */
 
+#include <linux/mm.h>
+#include <linux/sched.h>
 #include <linux/thread_info.h>
 #include <linux/kbuild.h>
 
@@ -17,4 +19,8 @@ void foo(void)
         OFFSET(TI_rar_saved, thread_info, rar_saved);
         OFFSET(TI_rsr_saved, thread_info, rsr_saved);
         OFFSET(TI_restart_block, thread_info, restart_block);
+        BLANK();
+        OFFSET(TSK_active_mm, task_struct, active_mm);
+        BLANK();
+        OFFSET(MM_pgd, mm_struct, pgd);
 }
diff --git a/arch/avr32/kernel/avr32_ksyms.c b/arch/avr32/kernel/avr32_ksyms.c
index 84a7d44edc67..11e310c567a9 100644
--- a/arch/avr32/kernel/avr32_ksyms.c
+++ b/arch/avr32/kernel/avr32_ksyms.c
@@ -58,6 +58,7 @@ EXPORT_SYMBOL(find_first_zero_bit);
 EXPORT_SYMBOL(find_next_zero_bit);
 EXPORT_SYMBOL(find_first_bit);
 EXPORT_SYMBOL(find_next_bit);
+EXPORT_SYMBOL(generic_find_next_le_bit);
 EXPORT_SYMBOL(generic_find_next_zero_le_bit);
 
 /* I/O primitives (lib/io-*.S) */
diff --git a/arch/avr32/kernel/entry-avr32b.S b/arch/avr32/kernel/entry-avr32b.S
index 2b398cae110c..33d49377b8be 100644
--- a/arch/avr32/kernel/entry-avr32b.S
+++ b/arch/avr32/kernel/entry-avr32b.S
@@ -334,9 +334,64 @@ save_full_context_ex:
 
         /* Low-level exception handlers */
 handle_critical:
+        /*
+         * AT32AP700x errata:
+         *
+         * After a Java stack overflow or underflow trap, any CPU
+         * memory access may cause erratic behavior. This will happen
+         * when the four least significant bits of the JOSP system
+         * register contains any value between 9 and 15 (inclusive).
+         *
+         * Possible workarounds:
+         *   - Don't use the Java Extension Module
+         *   - Ensure that the stack overflow and underflow trap
+         *     handlers do not do any memory access or trigger any
+         *     exceptions before the overflow/underflow condition is
+         *     cleared (by incrementing or decrementing the JOSP)
+         *   - Make sure that JOSP does not contain any problematic
+         *     value before doing any exception or interrupt
+         *     processing.
+         *   - Set up a critical exception handler which writes a
+         *     known-to-be-safe value, e.g. 4, to JOSP before doing
+         *     any further processing.
+         *
+         * We'll use the last workaround for now since we cannot
+         * guarantee that user space processes don't use Java mode.
+         * Non-well-behaving userland will be terminated with extreme
+         * prejudice.
+         */
+#ifdef CONFIG_CPU_AT32AP700X
+        /*
+         * There's a chance we can't touch memory, so temporarily
+         * borrow PTBR to save the stack pointer while we fix things
+         * up...
+         */
+        mtsr    SYSREG_PTBR, sp
+        mov     sp, 4
+        mtsr    SYSREG_JOSP, sp
+        mfsr    sp, SYSREG_PTBR
+        sub     pc, -2
+
+        /* Push most of pt_regs on stack. We'll do the rest later */
         sub     sp, 4
-        stmts   --sp, r0-lr
-        rcall   save_full_context_ex
+        pushm   r0-r12
+
+        /* PTBR mirrors current_thread_info()->task->active_mm->pgd */
+        get_thread_info r0
+        ld.w    r1, r0[TI_task]
+        ld.w    r2, r1[TSK_active_mm]
+        ld.w    r3, r2[MM_pgd]
+        mtsr    SYSREG_PTBR, r3
+#else
+        sub     sp, 4
+        pushm   r0-r12
+#endif
+        sub     r0, sp, -(14 * 4)
+        mov     r1, lr
+        mfsr    r2, SYSREG_RAR_EX
+        mfsr    r3, SYSREG_RSR_EX
+        pushm   r0-r3
+
         mfsr    r12, SYSREG_ECR
         mov     r11, sp
         rcall   do_critical_exception
diff --git a/arch/avr32/kernel/process.c b/arch/avr32/kernel/process.c
index 2c08ac992ac3..134d5302b6dd 100644
--- a/arch/avr32/kernel/process.c
+++ b/arch/avr32/kernel/process.c
@@ -9,6 +9,7 @@
 #include <linux/module.h>
 #include <linux/kallsyms.h>
 #include <linux/fs.h>
+#include <linux/pm.h>
 #include <linux/ptrace.h>
 #include <linux/reboot.h>
 #include <linux/tick.h>
@@ -20,7 +21,7 @@
 
 #include <mach/pm.h>
 
-void (*pm_power_off)(void) = NULL;
+void (*pm_power_off)(void);
 EXPORT_SYMBOL(pm_power_off);
 
 /*
diff --git a/arch/avr32/kernel/setup.c b/arch/avr32/kernel/setup.c
index d8e623c426c1..5c7083916c33 100644
--- a/arch/avr32/kernel/setup.c
+++ b/arch/avr32/kernel/setup.c
@@ -283,6 +283,25 @@ static int __init early_parse_fbmem(char *p)
 }
 early_param("fbmem", early_parse_fbmem);
 
+/*
+ * Pick out the memory size.  We look for mem=size@start,
+ * where start and size are "size[KkMmGg]"
+ */
+static int __init early_mem(char *p)
+{
+        resource_size_t size, start;
+
+        start = system_ram->start;
+        size  = memparse(p, &p);
+        if (*p == '@')
+                start = memparse(p + 1, &p);
+
+        system_ram->start = start;
+        system_ram->end = system_ram->start + size - 1;
+        return 0;
+}
+early_param("mem", early_mem);
+
 static int __init parse_tag_core(struct tag *tag)
 {
         if (tag->hdr.size > 2) {
diff --git a/arch/avr32/kernel/syscall-stubs.S b/arch/avr32/kernel/syscall-stubs.S
index 890286a1e62b..673178e235f3 100644
--- a/arch/avr32/kernel/syscall-stubs.S
+++ b/arch/avr32/kernel/syscall-stubs.S
@@ -109,3 +109,12 @@ __sys_epoll_pwait:
         rcall   sys_epoll_pwait
         sub     sp, -4
         popm    pc
+
+        .global __sys_sync_file_range
+        .type   __sys_sync_file_range,@function
+__sys_sync_file_range:
+        pushm   lr
+        st.w    --sp, ARG6
+        rcall   sys_sync_file_range
+        sub     sp, -4
+        popm    pc
diff --git a/arch/avr32/kernel/syscall_table.S b/arch/avr32/kernel/syscall_table.S
index 478bda4c4a09..7ee0057613b3 100644
--- a/arch/avr32/kernel/syscall_table.S
+++ b/arch/avr32/kernel/syscall_table.S
@@ -275,7 +275,7 @@ sys_call_table:
         .long   sys_set_robust_list
         .long   sys_get_robust_list     /* 260 */
         .long   __sys_splice
-        .long   sys_sync_file_range
+        .long   __sys_sync_file_range
         .long   sys_tee
         .long   sys_vmsplice
         .long   __sys_epoll_pwait       /* 265 */
diff --git a/arch/avr32/kernel/traps.c b/arch/avr32/kernel/traps.c
index b835c4c01368..0d987373bc01 100644
--- a/arch/avr32/kernel/traps.c
+++ b/arch/avr32/kernel/traps.c
@@ -116,15 +116,15 @@ asmlinkage void do_nmi(unsigned long ecr, struct pt_regs *regs)
         switch (ret) {
         case NOTIFY_OK:
         case NOTIFY_STOP:
-                return;
+                break;
         case NOTIFY_BAD:
                 die("Fatal Non-Maskable Interrupt", regs, SIGINT);
         default:
+                printk(KERN_ALERT "Got NMI, but nobody cared. Disabling...\n");
+                nmi_disable();
                 break;
         }
-
-        printk(KERN_ALERT "Got NMI, but nobody cared. Disabling...\n");
-        nmi_disable();
+        nmi_exit();
 }
 
 asmlinkage void do_critical_exception(unsigned long ecr, struct pt_regs *regs)