parisc: Use long jump to reach ftrace_return_to_handler()

Depending on config options we will need to use a long jump to reach
ftrace_return_to_handler().  Additionally only compile the
parisc_return_to_handler code when CONFIG_FUNCTION_GRAPH_TRACER is set.

Signed-off-by: Helge Deller <deller@gmx.de>

diff --git a/arch/parisc/kernel/entry.S b/arch/parisc/kernel/entry.S
index 2b2b0df67be5871db7eddf93f403a7337cf914f8..baa3d9d6e971f597326324220cfd3b091b2eec60 100644 (file)
--- a/arch/parisc/kernel/entry.S
+++ b/arch/parisc/kernel/entry.S
@@ -2019,6 +2019,7 @@ ftrace_stub:
        .procend
 ENDPROC(mcount)
 
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
        .align 8
        .globl return_to_handler
        .type  return_to_handler, @function
@@ -2040,11 +2041,17 @@ parisc_return_to_handler:
 #endif
 
        /* call ftrace_return_to_handler(0) */
+       .import ftrace_return_to_handler,code
+       load32 ftrace_return_to_handler,%ret0
+       load32 .Lftrace_ret,%r2
 #ifdef CONFIG_64BIT
        ldo -16(%sp),%ret1              /* Reference param save area */
+       bve     (%ret0)
+#else
+       bv      %r0(%ret0)
 #endif
-       BL ftrace_return_to_handler,%r2
        ldi 0,%r26
+.Lftrace_ret:
        copy %ret0,%rp
 
        /* restore original return values */
@@ -2062,6 +2069,8 @@ parisc_return_to_handler:
        .procend
 ENDPROC(return_to_handler)
 
+#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
+
 #endif /* CONFIG_FUNCTION_TRACER */
 
 #ifdef CONFIG_IRQSTACKS