sparc64: Implement HAVE_CONTEXT_TRACKING

Mark the places when the system are in user or are in kernel.
This is used to make full dynticks system (tickless) --
CONFIG_NO_HZ_FULL dependence.

Signed-off-by: Kirill Tkhai <tkhai@yandex.ru>
CC: David Miller <davem@davemloft.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 9 insertions, 5 deletions

diff --git a/arch/sparc/mm/fault_64.c b/arch/sparc/mm/fault_64.c
index 2ebec263d685..69bb818fdd79 100644
--- a/arch/sparc/mm/fault_64.c
+++ b/arch/sparc/mm/fault_64.c
@@ -21,6 +21,7 @@
 #include <linux/kprobes.h>
 #include <linux/kdebug.h>
 #include <linux/percpu.h>
+#include <linux/context_tracking.h>
 
 #include <asm/page.h>
 #include <asm/pgtable.h>
@@ -272,6 +273,7 @@ static void noinline __kprobes bogus_32bit_fault_address(struct pt_regs *regs,
 
 asmlinkage void __kprobes do_sparc64_fault(struct pt_regs *regs)
 {
+        enum ctx_state prev_state = exception_enter();
         struct mm_struct *mm = current->mm;
         struct vm_area_struct *vma;
         unsigned int insn = 0;
@@ -282,7 +284,7 @@ asmlinkage void __kprobes do_sparc64_fault(struct pt_regs *regs)
         fault_code = get_thread_fault_code();
 
         if (notify_page_fault(regs))
-                return;
+                goto exit_exception;
 
         si_code = SEGV_MAPERR;
         address = current_thread_info()->fault_address;
@@ -313,7 +315,7 @@ asmlinkage void __kprobes do_sparc64_fault(struct pt_regs *regs)
                         /* Valid, no problems... */
                 } else {
                         bad_kernel_pc(regs, address);
-                        return;
+                        goto exit_exception;
                 }
         } else
                 flags |= FAULT_FLAG_USER;
@@ -430,7 +432,7 @@ good_area:
         fault = handle_mm_fault(mm, vma, address, flags);
 
         if ((fault & VM_FAULT_RETRY) && fatal_signal_pending(current))
-                return;
+                goto exit_exception;
 
         if (unlikely(fault & VM_FAULT_ERROR)) {
                 if (fault & VM_FAULT_OOM)
@@ -482,6 +484,8 @@ good_area:
 
         }
 #endif
+exit_exception:
+        exception_exit(prev_state);
         return;
 
         /*
@@ -494,7 +498,7 @@ bad_area:
 
 handle_kernel_fault:
         do_kernel_fault(regs, si_code, fault_code, insn, address);
-        return;
+        goto exit_exception;
 
 /*
  * We ran out of memory, or some other thing happened to us that made
@@ -505,7 +509,7 @@ out_of_memory:
         up_read(&mm->mmap_sem);
         if (!(regs->tstate & TSTATE_PRIV)) {
                 pagefault_out_of_memory();
-                return;
+                goto exit_exception;
         }
         goto handle_kernel_fault;