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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>
This commit is contained in:
Russell King 2010-05-15 10:40:21 +01:00
parent 8e2a43f5f5
commit 49aea0fd95
1 changed files with 11 additions and 2 deletions
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13
arch/arm/nwfpe/fpmodule.c
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@ -24,6 +24,7 @@
#include "fpa11.h" #include "fpa11.h"
#include <linux/module.h> #include <linux/module.h>
#include <linux/moduleparam.h>
/* XXX */ /* XXX */
#include <linux/errno.h> #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. 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) void float_raise(signed char flags)
{ {
register unsigned int fpsr, cumulativeTraps; register unsigned int fpsr, cumulativeTraps;
#ifdef CONFIG_DEBUG_USER #ifdef CONFIG_DEBUG_USER
/* Ignore inexact errors as there are far too many of them to log */ if (flags & debug)
if (flags & ~BIT_IXC)
printk(KERN_DEBUG printk(KERN_DEBUG
"NWFPE: %s[%d] takes exception %08x at %p from %08lx\n", "NWFPE: %s[%d] takes exception %08x at %p from %08lx\n",
current->comm, current->pid, flags, current->comm, current->pid, flags,
@ -179,3 +184,7 @@ module_exit(fpe_exit);
MODULE_AUTHOR("Scott Bambrough <scottb@rebel.com>"); MODULE_AUTHOR("Scott Bambrough <scottb@rebel.com>");
MODULE_DESCRIPTION("NWFPE floating point emulator (" NWFPE_BITS " precision)"); MODULE_DESCRIPTION("NWFPE floating point emulator (" NWFPE_BITS " precision)");
MODULE_LICENSE("GPL"); MODULE_LICENSE("GPL");
#ifdef CONFIG_DEBUG_USER
module_param(debug, int, 0644);
#endif