linux-kernel - [PATCH 12/14] arch/tile: support new info op generated by compiler

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Message-Id: <f2edfa1e4f9aa1aa7fea3d69f75eccabcc0f1837.1287090291.git.cmetcalf@tilera.com>
Date:	Thu, 14 Oct 2010 16:46:22 -0400
From:	Chris Metcalf <cmetcalf@...era.com>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:	Arnd Bergmann <arnd@...db.de>
Subject: [PATCH 12/14] 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@...era.com>
---
 arch/tile/include/asm/backtrace.h |    5 ++++-
 arch/tile/kernel/backtrace.c      |    4 ++++
 2 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/arch/tile/include/asm/backtrace.h b/arch/tile/include/asm/backtrace.h
index 758ca46..f18887d 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 d3c41c1..55a6a74 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.
-- 
1.6.5.2

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