Merge branch 'parisc-4.7-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux

Pull parisc fixes from Helge Deller:

 - Fix printk time stamps on SMP systems which got wrong due to a patch
   which was added during the merge window

 - Fix two bugs in the stack backtrace code: Races in module unloading
   and possible invalid accesses to memory due to wrong instruction
   decoding (Mikulas Patocka)

 - Fix userspace crash when syscalls access invalid unaligned userspace
   addresses.  Those syscalls will now return EFAULT as expected.
   (tagged for stable kernel series)

* 'parisc-4.7-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
  parisc: Move die_if_kernel() prototype into traps.h header
  parisc: Fix pagefault crash in unaligned __get_user() call
  parisc: Fix printk time during boot
  parisc: Fix backtrace on PA-RISC

5 files changed, 29 insertions, 18 deletions

diff --git a/arch/parisc/include/asm/traps.h b/arch/parisc/include/asm/traps.h
index 4736020ba5ea..5e953ab4530d 100644
--- a/arch/parisc/include/asm/traps.h
+++ b/arch/parisc/include/asm/traps.h
@@ -8,6 +8,8 @@ struct pt_regs;
 void parisc_terminate(char *msg, struct pt_regs *regs,
                 int code, unsigned long offset) __noreturn __cold;
 
+void die_if_kernel(char *str, struct pt_regs *regs, long err);
+
 /* mm/fault.c */
 void do_page_fault(struct pt_regs *regs, unsigned long code,
                 unsigned long address);
diff --git a/arch/parisc/kernel/processor.c b/arch/parisc/kernel/processor.c
index e81ccf1716e9..5adc339eb7c8 100644
--- a/arch/parisc/kernel/processor.c
+++ b/arch/parisc/kernel/processor.c
@@ -324,8 +324,9 @@ int init_per_cpu(int cpunum)
                 per_cpu(cpu_data, cpunum).fp_rev = coproc_cfg.revision;
                 per_cpu(cpu_data, cpunum).fp_model = coproc_cfg.model;
 
-                printk(KERN_INFO  "FP[%d] enabled: Rev %ld Model %ld\n",
-                        cpunum, coproc_cfg.revision, coproc_cfg.model);
+                if (cpunum == 0)
+                        printk(KERN_INFO  "FP[%d] enabled: Rev %ld Model %ld\n",
+                                cpunum, coproc_cfg.revision, coproc_cfg.model);
 
                 /*
                 ** store status register to stack (hopefully aligned)
diff --git a/arch/parisc/kernel/time.c b/arch/parisc/kernel/time.c
index 58dd6801f5be..31ec99a5f119 100644
--- a/arch/parisc/kernel/time.c
+++ b/arch/parisc/kernel/time.c
@@ -309,11 +309,6 @@ void __init time_init(void)
         clocks_calc_mult_shift(&cyc2ns_mul, &cyc2ns_shift, current_cr16_khz,
                                 NSEC_PER_MSEC, 0);
 
-#if defined(CONFIG_HAVE_UNSTABLE_SCHED_CLOCK) && defined(CONFIG_64BIT)
-        /* At bootup only one 64bit CPU is online and cr16 is "stable" */
-        set_sched_clock_stable();
-#endif
-
         start_cpu_itimer();     /* get CPU 0 started */
 
         /* register at clocksource framework */
diff --git a/arch/parisc/kernel/unaligned.c b/arch/parisc/kernel/unaligned.c
index d7c0acb35ec2..2b65c0177778 100644
--- a/arch/parisc/kernel/unaligned.c
+++ b/arch/parisc/kernel/unaligned.c
@@ -28,6 +28,7 @@
 #include <linux/ratelimit.h>
 #include <asm/uaccess.h>
 #include <asm/hardirq.h>
+#include <asm/traps.h>
 
 /* #define DEBUG_UNALIGNED 1 */
 
@@ -130,8 +131,6 @@
 
 int unaligned_enabled __read_mostly = 1;
 
-void die_if_kernel (char *str, struct pt_regs *regs, long err);
-
 static int emulate_ldh(struct pt_regs *regs, int toreg)
 {
         unsigned long saddr = regs->ior;
@@ -666,7 +665,7 @@ void handle_unaligned(struct pt_regs *regs)
                 break;
         }
 
-        if (modify && R1(regs->iir))
+        if (ret == 0 && modify && R1(regs->iir))
                 regs->gr[R1(regs->iir)] = newbase;
 
 
@@ -677,6 +676,14 @@ void handle_unaligned(struct pt_regs *regs)
 
         if (ret)
         {
+                /*
+                 * The unaligned handler failed.
+                 * If we were called by __get_user() or __put_user() jump
+                 * to it's exception fixup handler instead of crashing.
+                 */
+                if (!user_mode(regs) && fixup_exception(regs))
+                        return;
+
                 printk(KERN_CRIT "Unaligned handler failed, ret = %d\n", ret);
                 die_if_kernel("Unaligned data reference", regs, 28);
 
diff --git a/arch/parisc/kernel/unwind.c b/arch/parisc/kernel/unwind.c
index ddd988b267a9..e278a87f43cc 100644
--- a/arch/parisc/kernel/unwind.c
+++ b/arch/parisc/kernel/unwind.c
@@ -75,7 +75,10 @@ find_unwind_entry(unsigned long addr)
         if (addr >= kernel_unwind_table.start && 
             addr <= kernel_unwind_table.end)
                 e = find_unwind_entry_in_table(&kernel_unwind_table, addr);
-        else 
+        else {
+                unsigned long flags;
+
+                spin_lock_irqsave(&unwind_lock, flags);
                 list_for_each_entry(table, &unwind_tables, list) {
                         if (addr >= table->start && 
                             addr <= table->end)
@@ -86,6 +89,8 @@ find_unwind_entry(unsigned long addr)
                                 break;
                         }
                 }
+                spin_unlock_irqrestore(&unwind_lock, flags);
+        }
 
         return e;
 }
@@ -303,18 +308,16 @@ static void unwind_frame_regs(struct unwind_frame_info *info)
 
                         insn = *(unsigned int *)npc;
 
-                        if ((insn & 0xffffc000) == 0x37de0000 ||
-                            (insn & 0xffe00000) == 0x6fc00000) {
+                        if ((insn & 0xffffc001) == 0x37de0000 ||
+                            (insn & 0xffe00001) == 0x6fc00000) {
                                 /* ldo X(sp), sp, or stwm X,D(sp) */
-                                frame_size += (insn & 0x1 ? -1 << 13 : 0) | 
-                                        ((insn & 0x3fff) >> 1);
+                                frame_size += (insn & 0x3fff) >> 1;
                                 dbg("analyzing func @ %lx, insn=%08x @ "
                                     "%lx, frame_size = %ld\n", info->ip,
                                     insn, npc, frame_size);
-                        } else if ((insn & 0xffe00008) == 0x73c00008) {
+                        } else if ((insn & 0xffe00009) == 0x73c00008) {
                                 /* std,ma X,D(sp) */
-                                frame_size += (insn & 0x1 ? -1 << 13 : 0) | 
-                                        (((insn >> 4) & 0x3ff) << 3);
+                                frame_size += ((insn >> 4) & 0x3ff) << 3;
                                 dbg("analyzing func @ %lx, insn=%08x @ "
                                     "%lx, frame_size = %ld\n", info->ip,
                                     insn, npc, frame_size);
@@ -333,6 +336,9 @@ static void unwind_frame_regs(struct unwind_frame_info *info)
                         }
                 }
 
+                if (frame_size > e->Total_frame_size << 3)
+                        frame_size = e->Total_frame_size << 3;
+
                 if (!unwind_special(info, e->region_start, frame_size)) {
                         info->prev_sp = info->sp - frame_size;
                         if (e->Millicode)