diff options
Diffstat (limited to 'arch/s390/kernel/debug.c')
| -rw-r--r-- | arch/s390/kernel/debug.c | 40 |
1 files changed, 31 insertions, 9 deletions
diff --git a/arch/s390/kernel/debug.c b/arch/s390/kernel/debug.c index 6848828b962..19e5e9eba54 100644 --- a/arch/s390/kernel/debug.c +++ b/arch/s390/kernel/debug.c @@ -2,8 +2,8 @@ * arch/s390/kernel/debug.c * S/390 debug facility * - * Copyright (C) 1999, 2000 IBM Deutschland Entwicklung GmbH, - * IBM Corporation + * Copyright IBM Corp. 1999, 2012 + * * Author(s): Michael Holzheu (holzheu@de.ibm.com), * Holger Smolinski (Holger.Smolinski@de.ibm.com) * @@ -167,6 +167,7 @@ static debug_info_t *debug_area_last = NULL; static DEFINE_MUTEX(debug_mutex); static int initialized; +static int debug_critical; static const struct file_operations debug_file_ops = { .owner = THIS_MODULE, @@ -932,6 +933,11 @@ debug_stop_all(void) } +void debug_set_critical(void) +{ + debug_critical = 1; +} + /* * debug_event_common: * - write debug entry with given size @@ -945,7 +951,11 @@ debug_event_common(debug_info_t * id, int level, const void *buf, int len) if (!debug_active || !id->areas) return NULL; - spin_lock_irqsave(&id->lock, flags); + if (debug_critical) { + if (!spin_trylock_irqsave(&id->lock, flags)) + return NULL; + } else + spin_lock_irqsave(&id->lock, flags); active = get_active_entry(id); memset(DEBUG_DATA(active), 0, id->buf_size); memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size)); @@ -968,7 +978,11 @@ debug_entry_t if (!debug_active || !id->areas) return NULL; - spin_lock_irqsave(&id->lock, flags); + if (debug_critical) { + if (!spin_trylock_irqsave(&id->lock, flags)) + return NULL; + } else + spin_lock_irqsave(&id->lock, flags); active = get_active_entry(id); memset(DEBUG_DATA(active), 0, id->buf_size); memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size)); @@ -1013,7 +1027,11 @@ debug_sprintf_event(debug_info_t* id, int level,char *string,...) return NULL; numargs=debug_count_numargs(string); - spin_lock_irqsave(&id->lock, flags); + if (debug_critical) { + if (!spin_trylock_irqsave(&id->lock, flags)) + return NULL; + } else + spin_lock_irqsave(&id->lock, flags); active = get_active_entry(id); curr_event=(debug_sprintf_entry_t *) DEBUG_DATA(active); va_start(ap,string); @@ -1047,7 +1065,11 @@ debug_sprintf_exception(debug_info_t* id, int level,char *string,...) numargs=debug_count_numargs(string); - spin_lock_irqsave(&id->lock, flags); + if (debug_critical) { + if (!spin_trylock_irqsave(&id->lock, flags)) + return NULL; + } else + spin_lock_irqsave(&id->lock, flags); active = get_active_entry(id); curr_event=(debug_sprintf_entry_t *)DEBUG_DATA(active); va_start(ap,string); @@ -1428,10 +1450,10 @@ debug_hex_ascii_format_fn(debug_info_t * id, struct debug_view *view, rc += sprintf(out_buf + rc, "| "); for (i = 0; i < id->buf_size; i++) { unsigned char c = in_buf[i]; - if (!isprint(c)) - rc += sprintf(out_buf + rc, "."); - else + if (isascii(c) && isprint(c)) rc += sprintf(out_buf + rc, "%c", c); + else + rc += sprintf(out_buf + rc, "."); } rc += sprintf(out_buf + rc, "\n"); return rc; |