arch/tile: support new info op generated by compiler

This just syncs the backtracing support in the kernel to the
upstream backtrace library.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>

2 files changed, 8 insertions, 1 deletions

diff --git a/arch/tile/include/asm/backtrace.h b/arch/tile/include/asm/backtrace.h
index 758ca4619d50..f18887d82399 100644
--- a/arch/tile/include/asm/backtrace.h
+++ b/arch/tile/include/asm/backtrace.h
@@ -146,7 +146,10 @@ enum {
 
         CALLER_SP_IN_R52_BASE = 4,
 
-        CALLER_SP_OFFSET_BASE = 8
+        CALLER_SP_OFFSET_BASE = 8,
+
+        /* Marks the entry point of certain functions. */
+        ENTRY_POINT_INFO_OP = 16
 };
 
 
diff --git a/arch/tile/kernel/backtrace.c b/arch/tile/kernel/backtrace.c
index d3c41c1ff6bd..55a6a74974b4 100644
--- a/arch/tile/kernel/backtrace.c
+++ b/arch/tile/kernel/backtrace.c
@@ -369,6 +369,10 @@ static void find_caller_pc_and_caller_sp(CallerLocation *location,
                                         /* Weird; reserved value, ignore it. */
                                         continue;
                                 }
+                                if (info_operand & ENTRY_POINT_INFO_OP) {
+                                        /* This info op is ignored by the backtracer. */
+                                        continue;
+                                }
 
                                 /* Skip info ops which are not in the
                                  * "one_ago" mode we want right now.