diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Kconfig.debug | 19 | ||||
| -rw-r--r-- | lib/Makefile | 3 | ||||
| -rw-r--r-- | lib/bsearch.c | 53 | ||||
| -rw-r--r-- | lib/dma-debug.c | 18 | ||||
| -rw-r--r-- | lib/flex_array.c | 24 | ||||
| -rw-r--r-- | lib/string.c | 29 | ||||
| -rw-r--r-- | lib/vsprintf.c | 2 |
7 files changed, 133 insertions, 15 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 3aa278046d78..10ef61981149 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -238,6 +238,21 @@ config DETECT_HUNG_TASK enabled then all held locks will also be reported. This feature has negligible overhead. +config DEFAULT_HUNG_TASK_TIMEOUT + int "Default timeout for hung task detection (in seconds)" + depends on DETECT_HUNG_TASK + default 120 + help + This option controls the default timeout (in seconds) used + to determine when a task has become non-responsive and should + be considered hung. + + It can be adjusted at runtime via the kernel.hung_task_timeout + sysctl or by writing a value to /proc/sys/kernel/hung_task_timeout. + + A timeout of 0 disables the check. The default is two minutes. + Keeping the default should be fine in most cases. + config BOOTPARAM_HUNG_TASK_PANIC bool "Panic (Reboot) On Hung Tasks" depends on DETECT_HUNG_TASK @@ -398,9 +413,9 @@ config SLUB_STATS config DEBUG_KMEMLEAK bool "Kernel memory leak detector" depends on DEBUG_KERNEL && EXPERIMENTAL && !MEMORY_HOTPLUG && \ - (X86 || ARM || PPC || S390 || SPARC64 || SUPERH || MICROBLAZE || TILE) + (X86 || ARM || PPC || MIPS || S390 || SPARC64 || SUPERH || MICROBLAZE || TILE) - select DEBUG_FS if SYSFS + select DEBUG_FS select STACKTRACE if STACKTRACE_SUPPORT select KALLSYMS select CRC32 diff --git a/lib/Makefile b/lib/Makefile index ef0f28571156..4b49a249064b 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -21,7 +21,8 @@ lib-y += kobject.o kref.o klist.o obj-y += bcd.o div64.o sort.o parser.o halfmd4.o debug_locks.o random32.o \ bust_spinlocks.o hexdump.o kasprintf.o bitmap.o scatterlist.o \ - string_helpers.o gcd.o lcm.o list_sort.o uuid.o flex_array.o + string_helpers.o gcd.o lcm.o list_sort.o uuid.o flex_array.o \ + bsearch.o obj-y += kstrtox.o obj-$(CONFIG_TEST_KSTRTOX) += test-kstrtox.o diff --git a/lib/bsearch.c b/lib/bsearch.c new file mode 100644 index 000000000000..5b54758e2afb --- /dev/null +++ b/lib/bsearch.c @@ -0,0 +1,53 @@ +/* + * A generic implementation of binary search for the Linux kernel + * + * Copyright (C) 2008-2009 Ksplice, Inc. + * Author: Tim Abbott <tabbott@ksplice.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; version 2. + */ + +#include <linux/module.h> +#include <linux/bsearch.h> + +/* + * bsearch - binary search an array of elements + * @key: pointer to item being searched for + * @base: pointer to first element to search + * @num: number of elements + * @size: size of each element + * @cmp: pointer to comparison function + * + * This function does a binary search on the given array. The + * contents of the array should already be in ascending sorted order + * under the provided comparison function. + * + * Note that the key need not have the same type as the elements in + * the array, e.g. key could be a string and the comparison function + * could compare the string with the struct's name field. However, if + * the key and elements in the array are of the same type, you can use + * the same comparison function for both sort() and bsearch(). + */ +void *bsearch(const void *key, const void *base, size_t num, size_t size, + int (*cmp)(const void *key, const void *elt)) +{ + size_t start = 0, end = num; + int result; + + while (start < end) { + size_t mid = start + (end - start) / 2; + + result = cmp(key, base + mid * size); + if (result < 0) + end = mid; + else if (result > 0) + start = mid + 1; + else + return (void *)base + mid * size; + } + + return NULL; +} +EXPORT_SYMBOL(bsearch); diff --git a/lib/dma-debug.c b/lib/dma-debug.c index 4bfb0471f106..db07bfd9298e 100644 --- a/lib/dma-debug.c +++ b/lib/dma-debug.c @@ -649,7 +649,7 @@ out_err: return -ENOMEM; } -static int device_dma_allocations(struct device *dev) +static int device_dma_allocations(struct device *dev, struct dma_debug_entry **out_entry) { struct dma_debug_entry *entry; unsigned long flags; @@ -660,8 +660,10 @@ static int device_dma_allocations(struct device *dev) for (i = 0; i < HASH_SIZE; ++i) { spin_lock(&dma_entry_hash[i].lock); list_for_each_entry(entry, &dma_entry_hash[i].list, list) { - if (entry->dev == dev) + if (entry->dev == dev) { count += 1; + *out_entry = entry; + } } spin_unlock(&dma_entry_hash[i].lock); } @@ -674,6 +676,7 @@ static int device_dma_allocations(struct device *dev) static int dma_debug_device_change(struct notifier_block *nb, unsigned long action, void *data) { struct device *dev = data; + struct dma_debug_entry *uninitialized_var(entry); int count; if (global_disable) @@ -681,12 +684,17 @@ static int dma_debug_device_change(struct notifier_block *nb, unsigned long acti switch (action) { case BUS_NOTIFY_UNBOUND_DRIVER: - count = device_dma_allocations(dev); + count = device_dma_allocations(dev, &entry); if (count == 0) break; - err_printk(dev, NULL, "DMA-API: device driver has pending " + err_printk(dev, entry, "DMA-API: device driver has pending " "DMA allocations while released from device " - "[count=%d]\n", count); + "[count=%d]\n" + "One of leaked entries details: " + "[device address=0x%016llx] [size=%llu bytes] " + "[mapped with %s] [mapped as %s]\n", + count, entry->dev_addr, entry->size, + dir2name[entry->direction], type2name[entry->type]); break; default: break; diff --git a/lib/flex_array.c b/lib/flex_array.c index c0ea40ba2082..854b57bd7d9d 100644 --- a/lib/flex_array.c +++ b/lib/flex_array.c @@ -232,10 +232,10 @@ EXPORT_SYMBOL(flex_array_clear); /** * flex_array_prealloc - guarantee that array space exists - * @fa: the flex array for which to preallocate parts - * @start: index of first array element for which space is allocated - * @end: index of last (inclusive) element for which space is allocated - * @flags: page allocation flags + * @fa: the flex array for which to preallocate parts + * @start: index of first array element for which space is allocated + * @nr_elements: number of elements for which space is allocated + * @flags: page allocation flags * * This will guarantee that no future calls to flex_array_put() * will allocate memory. It can be used if you are expecting to @@ -245,14 +245,24 @@ EXPORT_SYMBOL(flex_array_clear); * Locking must be provided by the caller. */ int flex_array_prealloc(struct flex_array *fa, unsigned int start, - unsigned int end, gfp_t flags) + unsigned int nr_elements, gfp_t flags) { int start_part; int end_part; int part_nr; + unsigned int end; struct flex_array_part *part; - if (start >= fa->total_nr_elements || end >= fa->total_nr_elements) + if (!start && !nr_elements) + return 0; + if (start >= fa->total_nr_elements) + return -ENOSPC; + if (!nr_elements) + return 0; + + end = start + nr_elements - 1; + + if (end >= fa->total_nr_elements) return -ENOSPC; if (elements_fit_in_base(fa)) return 0; @@ -343,6 +353,8 @@ int flex_array_shrink(struct flex_array *fa) int part_nr; int ret = 0; + if (!fa->total_nr_elements) + return 0; if (elements_fit_in_base(fa)) return ret; for (part_nr = 0; part_nr < FLEX_ARRAY_NR_BASE_PTRS; part_nr++) { diff --git a/lib/string.c b/lib/string.c index f71bead1be3e..01fad9b203e1 100644 --- a/lib/string.c +++ b/lib/string.c @@ -535,6 +535,35 @@ bool sysfs_streq(const char *s1, const char *s2) } EXPORT_SYMBOL(sysfs_streq); +/** + * strtobool - convert common user inputs into boolean values + * @s: input string + * @res: result + * + * This routine returns 0 iff the first character is one of 'Yy1Nn0'. + * Otherwise it will return -EINVAL. Value pointed to by res is + * updated upon finding a match. + */ +int strtobool(const char *s, bool *res) +{ + switch (s[0]) { + case 'y': + case 'Y': + case '1': + *res = true; + break; + case 'n': + case 'N': + case '0': + *res = false; + break; + default: + return -EINVAL; + } + return 0; +} +EXPORT_SYMBOL(strtobool); + #ifndef __HAVE_ARCH_MEMSET /** * memset - Fill a region of memory with the given value diff --git a/lib/vsprintf.c b/lib/vsprintf.c index bc0ac6b333dc..dfd60192bc2e 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -797,7 +797,7 @@ char *uuid_string(char *buf, char *end, const u8 *addr, return string(buf, end, uuid, spec); } -int kptr_restrict = 1; +int kptr_restrict __read_mostly; /* * Show a '%p' thing. A kernel extension is that the '%p' is followed |