linux-kernel - Compress stack unwinder output

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Message-ID: <20061006215412.GB15420@redhat.com>
Date:	Fri, 6 Oct 2006 17:54:12 -0400
From:	Dave Jones <davej@...hat.com>
To:	ak@...e.de
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Compress stack unwinder output

The unwinder has some extra newlines, which eat up loads of screen
space when it spews. (See https://bugzilla.redhat.com/bugzilla/attachment.cgi?id=137900
for a nasty example).

warning_symbol-> and warning-> already printk a newline, so don't add one
in the strings passed to them.

Signed-off-by: Dave Jones <davej@...hat.com>

--- linux-2.6.18.noarch/arch/x86_64/kernel/traps.c~	2006-10-06 17:42:47.000000000 -0400
+++ linux-2.6.18.noarch/arch/x86_64/kernel/traps.c	2006-10-06 17:47:23.000000000 -0400
@@ -289,21 +289,21 @@ void dump_trace(struct task_struct *tsk,
 		}
 		if (unw_ret > 0) {
 			if (call_trace == 1 && !arch_unw_user_mode(&info)) {
-				ops->warning_symbol(data, "DWARF2 unwinder stuck at %s\n",
+				ops->warning_symbol(data, "DWARF2 unwinder stuck at %s",
 					     UNW_PC(&info));
 				if ((long)UNW_SP(&info) < 0) {
-					ops->warning(data, "Leftover inexact backtrace:\n");
+					ops->warning(data, "Leftover inexact backtrace:");
 					stack = (unsigned long *)UNW_SP(&info);
 					if (!stack)
 						return;
 				} else
-					ops->warning(data, "Full inexact backtrace again:\n");
+					ops->warning(data, "Full inexact backtrace again:");
 			} else if (call_trace >= 1)
 				return;
 			else
-				ops->warning(data, "Full inexact backtrace again:\n");
+				ops->warning(data, "Full inexact backtrace again:");
 		} else
-			ops->warning(data, "Inexact backtrace:\n");
+			ops->warning(data, "Inexact backtrace:");
 	}
 	if (!stack) {
 		unsigned long dummy;
--- linux-2.6.18.noarch/arch/i386/kernel/traps.c~	2006-10-06 17:47:28.000000000 -0400
+++ linux-2.6.18.noarch/arch/i386/kernel/traps.c	2006-10-06 17:47:45.000000000 -0400
@@ -194,22 +194,22 @@ void dump_trace(struct task_struct *task
 		}
 		if (unw_ret > 0) {
 			if (call_trace == 1 && !arch_unw_user_mode(&info)) {
-				ops->warning_symbol(data, "DWARF2 unwinder stuck at %s\n",
+				ops->warning_symbol(data, "DWARF2 unwinder stuck at %s",
 					     UNW_PC(&info));
 				if (UNW_SP(&info) >= PAGE_OFFSET) {
-					ops->warning(data, "Leftover inexact backtrace:\n");
+					ops->warning(data, "Leftover inexact backtrace:");
 					stack = (void *)UNW_SP(&info);
 					if (!stack)
 						return;
 					ebp = UNW_FP(&info);
 				} else
-					ops->warning(data, "Full inexact backtrace again:\n");
+					ops->warning(data, "Full inexact backtrace again:");
 			} else if (call_trace >= 1)
 				return;
 			else
-				ops->warning(data, "Full inexact backtrace again:\n");
+				ops->warning(data, "Full inexact backtrace again:");
 		} else
-			ops->warning(data, "Inexact backtrace:\n");
+			ops->warning(data, "Inexact backtrace:");
 	}
 	if (!stack) {
 		unsigned long dummy;
-- 
http://www.codemonkey.org.uk
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