1 files changed, 48 insertions, 0 deletions

diff --git a/arch/tile/kernel/process.c b/arch/tile/kernel/process.c
index d0065103eb7b..8e8633490f8b 100644
--- a/arch/tile/kernel/process.c
+++ b/arch/tile/kernel/process.c
@@ -25,10 +25,13 @@
 #include <linux/hardirq.h>
 #include <linux/syscalls.h>
 #include <linux/kernel.h>
+#include <linux/tracehook.h>
+#include <linux/signal.h>
 #include <asm/system.h>
 #include <asm/stack.h>
 #include <asm/homecache.h>
 #include <asm/syscalls.h>
+#include <asm/traps.h>
 #ifdef CONFIG_HARDWALL
 #include <asm/hardwall.h>
 #endif
@@ -546,6 +549,51 @@ struct task_struct *__sched _switch_to(struct task_struct *prev,
         return __switch_to(prev, next, next_current_ksp0(next));
 }
 
+/*
+ * This routine is called on return from interrupt if any of the
+ * TIF_WORK_MASK flags are set in thread_info->flags.  It is
+ * entered with interrupts disabled so we don't miss an event
+ * that modified the thread_info flags.  If any flag is set, we
+ * handle it and return, and the calling assembly code will
+ * re-disable interrupts, reload the thread flags, and call back
+ * if more flags need to be handled.
+ *
+ * We return whether we need to check the thread_info flags again
+ * or not.  Note that we don't clear TIF_SINGLESTEP here, so it's
+ * important that it be tested last, and then claim that we don't
+ * need to recheck the flags.
+ */
+int do_work_pending(struct pt_regs *regs, u32 thread_info_flags)
+{
+        if (thread_info_flags & _TIF_NEED_RESCHED) {
+                schedule();
+                return 1;
+        }
+#if CHIP_HAS_TILE_DMA() || CHIP_HAS_SN_PROC()
+        if (thread_info_flags & _TIF_ASYNC_TLB) {
+                do_async_page_fault(regs);
+                return 1;
+        }
+#endif
+        if (thread_info_flags & _TIF_SIGPENDING) {
+                do_signal(regs);
+                return 1;
+        }
+        if (thread_info_flags & _TIF_NOTIFY_RESUME) {
+                clear_thread_flag(TIF_NOTIFY_RESUME);
+                tracehook_notify_resume(regs);
+                if (current->replacement_session_keyring)
+                        key_replace_session_keyring();
+                return 1;
+        }
+        if (thread_info_flags & _TIF_SINGLESTEP) {
+                if ((regs->ex1 & SPR_EX_CONTEXT_1_1__PL_MASK) == 0)
+                        single_step_once(regs);
+                return 0;
+        }
+        panic("work_pending: bad flags %#x\n", thread_info_flags);
+}
+
 /* Note there is an implicit fifth argument if (clone_flags & CLONE_SETTLS). */
 SYSCALL_DEFINE5(clone, unsigned long, clone_flags, unsigned long, newsp,
                 void __user *, parent_tidptr, void __user *, child_tidptr,