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authorRussell King <rmk+kernel@arm.linux.org.uk>2010-05-15 10:40:21 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2010-05-15 15:03:51 +0100
commit49aea0fd95495538230e19f58e217fb06ffdbfeb (patch)
tree8865597906e8c706f90cb47786a55c73e3f7a12c /arch/arm/nwfpe
parent8e2a43f5f5e1255879064924917fb1a6e5be7cb3 (diff)
downloadblackbird-op-linux-49aea0fd95495538230e19f58e217fb06ffdbfeb.tar.gz
blackbird-op-linux-49aea0fd95495538230e19f58e217fb06ffdbfeb.zip
ARM: nwfpe: allow debugging output to be configured at runtime
Enabling CONFIG_USER_DEBUG allows NWFPE to complain about every FP exception, which with some programs can cause the kernel message log to fill with NWFPE debug, swamping out other messages. This change allows NWFPE debugging to be configured at run time. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/nwfpe')
-rw-r--r--arch/arm/nwfpe/fpmodule.c13
1 files changed, 11 insertions, 2 deletions
diff --git a/arch/arm/nwfpe/fpmodule.c b/arch/arm/nwfpe/fpmodule.c
index 4c0ab50f399a..cb7658e8acc5 100644
--- a/arch/arm/nwfpe/fpmodule.c
+++ b/arch/arm/nwfpe/fpmodule.c
@@ -24,6 +24,7 @@
#include "fpa11.h"
#include <linux/module.h>
+#include <linux/moduleparam.h>
/* XXX */
#include <linux/errno.h>
@@ -134,13 +135,17 @@ a SIGFPE exception if necessary. If not the relevant bits in the
cumulative exceptions flag byte are set and we return.
*/
+#ifdef CONFIG_DEBUG_USER
+/* By default, ignore inexact errors as there are far too many of them to log */
+static int debug = ~BIT_IXC;
+#endif
+
void float_raise(signed char flags)
{
register unsigned int fpsr, cumulativeTraps;
#ifdef CONFIG_DEBUG_USER
- /* Ignore inexact errors as there are far too many of them to log */
- if (flags & ~BIT_IXC)
+ if (flags & debug)
printk(KERN_DEBUG
"NWFPE: %s[%d] takes exception %08x at %p from %08lx\n",
current->comm, current->pid, flags,
@@ -179,3 +184,7 @@ module_exit(fpe_exit);
MODULE_AUTHOR("Scott Bambrough <scottb@rebel.com>");
MODULE_DESCRIPTION("NWFPE floating point emulator (" NWFPE_BITS " precision)");
MODULE_LICENSE("GPL");
+
+#ifdef CONFIG_DEBUG_USER
+module_param(debug, int, 0644);
+#endif
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