powerpc: Rework runlatch code

This moves the inlines into system.h and changes the runlatch
code to use the thread local flags (non-atomic) rather than
the TIF flags (atomic) to keep track of the latch state.

The code to turn it back on in an asynchronous interrupt is
now simplified and partially inlined.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 8 insertions, 1 deletions

diff --git a/arch/powerpc/include/asm/thread_info.h b/arch/powerpc/include/asm/thread_info.h
index 964714940961..4a741c7efd02 100644
--- a/arch/powerpc/include/asm/thread_info.h
+++ b/arch/powerpc/include/asm/thread_info.h
@@ -110,7 +110,6 @@ static inline struct thread_info *current_thread_info(void)
 #define TIF_NOERROR             12      /* Force successful syscall return */
 #define TIF_NOTIFY_RESUME       13      /* callback before returning to user */
 #define TIF_SYSCALL_TRACEPOINT  15      /* syscall tracepoint instrumentation */
-#define TIF_RUNLATCH            16      /* Is the runlatch enabled? */
 
 /* as above, but as bit values */
 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
@@ -141,11 +140,13 @@ static inline struct thread_info *current_thread_info(void)
 #define TLF_SLEEPING            1       /* suspend code enabled SLEEP mode */
 #define TLF_RESTORE_SIGMASK     2       /* Restore signal mask in do_signal */
 #define TLF_LAZY_MMU            3       /* tlb_batch is active */
+#define TLF_RUNLATCH            4       /* Is the runlatch enabled? */
 
 #define _TLF_NAPPING            (1 << TLF_NAPPING)
 #define _TLF_SLEEPING           (1 << TLF_SLEEPING)
 #define _TLF_RESTORE_SIGMASK    (1 << TLF_RESTORE_SIGMASK)
 #define _TLF_LAZY_MMU           (1 << TLF_LAZY_MMU)
+#define _TLF_RUNLATCH           (1 << TLF_RUNLATCH)
 
 #ifndef __ASSEMBLY__
 #define HAVE_SET_RESTORE_SIGMASK        1
@@ -156,6 +157,12 @@ static inline void set_restore_sigmask(void)
         set_bit(TIF_SIGPENDING, &ti->flags);
 }
 
+static inline bool test_thread_local_flags(unsigned int flags)
+{
+        struct thread_info *ti = current_thread_info();
+        return (ti->local_flags & flags) != 0;
+}
+
 #ifdef CONFIG_PPC64
 #define is_32bit_task() (test_thread_flag(TIF_32BIT))
 #else