diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Kconfig.debug | 20 | ||||
| -rw-r--r-- | lib/bcd.c | 8 | ||||
| -rw-r--r-- | lib/dynamic_debug.c | 56 |
3 files changed, 65 insertions, 19 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 2403a63b5da5..35c4565ee8fa 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -452,7 +452,8 @@ config SLUB_STATS config DEBUG_KMEMLEAK bool "Kernel memory leak detector" depends on DEBUG_KERNEL && EXPERIMENTAL && \ - (X86 || ARM || PPC || MIPS || S390 || SPARC64 || SUPERH || MICROBLAZE || TILE) + (X86 || ARM || PPC || MIPS || S390 || SPARC64 || SUPERH || \ + MICROBLAZE || TILE || ARM64) select DEBUG_FS select STACKTRACE if STACKTRACE_SUPPORT @@ -629,6 +630,20 @@ config PROVE_RCU_REPEATEDLY Say N if you are unsure. +config PROVE_RCU_DELAY + bool "RCU debugging: preemptible RCU race provocation" + depends on DEBUG_KERNEL && PREEMPT_RCU + default n + help + There is a class of races that involve an unlikely preemption + of __rcu_read_unlock() just after ->rcu_read_lock_nesting has + been set to INT_MIN. This feature inserts a delay at that + point to increase the probability of these races. + + Say Y to increase probability of preemption of __rcu_read_unlock(). + + Say N if you are unsure. + config SPARSE_RCU_POINTER bool "RCU debugging: sparse-based checks for pointer usage" default n @@ -739,7 +754,8 @@ config DEBUG_BUGVERBOSE bool "Verbose BUG() reporting (adds 70K)" if DEBUG_KERNEL && EXPERT depends on BUG depends on ARM || AVR32 || M32R || M68K || SPARC32 || SPARC64 || \ - FRV || SUPERH || GENERIC_BUG || BLACKFIN || MN10300 || TILE + FRV || SUPERH || GENERIC_BUG || BLACKFIN || MN10300 || \ + TILE || ARM64 default y help Say Y here to make BUG() panics output the file name and line number diff --git a/lib/bcd.c b/lib/bcd.c index 55efaf742346..40d304efe272 100644 --- a/lib/bcd.c +++ b/lib/bcd.c @@ -1,14 +1,14 @@ #include <linux/bcd.h> #include <linux/export.h> -unsigned bcd2bin(unsigned char val) +unsigned _bcd2bin(unsigned char val) { return (val & 0x0f) + (val >> 4) * 10; } -EXPORT_SYMBOL(bcd2bin); +EXPORT_SYMBOL(_bcd2bin); -unsigned char bin2bcd(unsigned val) +unsigned char _bin2bcd(unsigned val) { return ((val / 10) << 4) + val % 10; } -EXPORT_SYMBOL(bin2bcd); +EXPORT_SYMBOL(_bin2bcd); diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c index 7ca29a0a3019..e7f7d993357a 100644 --- a/lib/dynamic_debug.c +++ b/lib/dynamic_debug.c @@ -521,25 +521,25 @@ static char *dynamic_emit_prefix(const struct _ddebug *desc, char *buf) int pos_after_tid; int pos = 0; - pos += snprintf(buf + pos, remaining(pos), "%s", KERN_DEBUG); + *buf = '\0'; + if (desc->flags & _DPRINTK_FLAGS_INCL_TID) { if (in_interrupt()) - pos += snprintf(buf + pos, remaining(pos), "%s ", - "<intr>"); + pos += snprintf(buf + pos, remaining(pos), "<intr> "); else pos += snprintf(buf + pos, remaining(pos), "[%d] ", - task_pid_vnr(current)); + task_pid_vnr(current)); } pos_after_tid = pos; if (desc->flags & _DPRINTK_FLAGS_INCL_MODNAME) pos += snprintf(buf + pos, remaining(pos), "%s:", - desc->modname); + desc->modname); if (desc->flags & _DPRINTK_FLAGS_INCL_FUNCNAME) pos += snprintf(buf + pos, remaining(pos), "%s:", - desc->function); + desc->function); if (desc->flags & _DPRINTK_FLAGS_INCL_LINENO) pos += snprintf(buf + pos, remaining(pos), "%d:", - desc->lineno); + desc->lineno); if (pos - pos_after_tid) pos += snprintf(buf + pos, remaining(pos), " "); if (pos >= PREFIX_SIZE) @@ -559,9 +559,13 @@ int __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...) BUG_ON(!fmt); va_start(args, fmt); + vaf.fmt = fmt; vaf.va = &args; - res = printk("%s%pV", dynamic_emit_prefix(descriptor, buf), &vaf); + + res = printk(KERN_DEBUG "%s%pV", + dynamic_emit_prefix(descriptor, buf), &vaf); + va_end(args); return res; @@ -574,15 +578,26 @@ int __dynamic_dev_dbg(struct _ddebug *descriptor, struct va_format vaf; va_list args; int res; - char buf[PREFIX_SIZE]; BUG_ON(!descriptor); BUG_ON(!fmt); va_start(args, fmt); + vaf.fmt = fmt; vaf.va = &args; - res = __dev_printk(dynamic_emit_prefix(descriptor, buf), dev, &vaf); + + if (!dev) { + res = printk(KERN_DEBUG "(NULL device *): %pV", &vaf); + } else { + char buf[PREFIX_SIZE]; + + res = dev_printk_emit(7, dev, "%s%s %s: %pV", + dynamic_emit_prefix(descriptor, buf), + dev_driver_string(dev), dev_name(dev), + &vaf); + } + va_end(args); return res; @@ -592,20 +607,35 @@ EXPORT_SYMBOL(__dynamic_dev_dbg); #ifdef CONFIG_NET int __dynamic_netdev_dbg(struct _ddebug *descriptor, - const struct net_device *dev, const char *fmt, ...) + const struct net_device *dev, const char *fmt, ...) { struct va_format vaf; va_list args; int res; - char buf[PREFIX_SIZE]; BUG_ON(!descriptor); BUG_ON(!fmt); va_start(args, fmt); + vaf.fmt = fmt; vaf.va = &args; - res = __netdev_printk(dynamic_emit_prefix(descriptor, buf), dev, &vaf); + + if (dev && dev->dev.parent) { + char buf[PREFIX_SIZE]; + + res = dev_printk_emit(7, dev->dev.parent, + "%s%s %s %s: %pV", + dynamic_emit_prefix(descriptor, buf), + dev_driver_string(dev->dev.parent), + dev_name(dev->dev.parent), + netdev_name(dev), &vaf); + } else if (dev) { + res = printk(KERN_DEBUG "%s: %pV", netdev_name(dev), &vaf); + } else { + res = printk(KERN_DEBUG "(NULL net_device): %pV", &vaf); + } + va_end(args); return res; |