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-rw-r--r--lib/Kconfig9
-rw-r--r--lib/Kconfig.debug91
-rw-r--r--lib/Makefile14
-rw-r--r--lib/atomic64_test.c5
-rw-r--r--lib/cpu-notifier-error-inject.c63
-rw-r--r--lib/crc32.c2
-rw-r--r--lib/fdt.c2
-rw-r--r--lib/fdt_ro.c2
-rw-r--r--lib/fdt_rw.c2
-rw-r--r--lib/fdt_strerror.c2
-rw-r--r--lib/fdt_sw.c2
-rw-r--r--lib/fdt_wip.c2
-rw-r--r--lib/flex_proportions.c272
-rw-r--r--lib/memory-notifier-error-inject.c48
-rw-r--r--lib/memweight.c38
-rw-r--r--lib/notifier-error-inject.c112
-rw-r--r--lib/notifier-error-inject.h24
-rw-r--r--lib/pSeries-reconfig-notifier-error-inject.c51
-rw-r--r--lib/percpu_counter.c14
-rw-r--r--lib/pm-notifier-error-inject.c49
-rw-r--r--lib/scatterlist.c72
-rw-r--r--lib/spinlock_debug.c2
-rw-r--r--lib/vsprintf.c83
23 files changed, 895 insertions, 66 deletions
diff --git a/lib/Kconfig b/lib/Kconfig
index 8269d56dcdaa..bb94c1ba616a 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -340,6 +340,9 @@ config NLATTR
config GENERIC_ATOMIC64
bool
+config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
+ def_bool y if GENERIC_ATOMIC64
+
config LRU_CACHE
tristate
@@ -387,4 +390,10 @@ config SIGNATURE
Digital signature verification. Currently only RSA is supported.
Implementation is done using GnuPG MPI library
+#
+# libfdt files, only selected if needed.
+#
+config LIBFDT
+ bool
+
endmenu
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 4a186508bf8b..2403a63b5da5 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1084,18 +1084,105 @@ config LKDTM
Documentation on how to use the module can be found in
Documentation/fault-injection/provoke-crashes.txt
+config NOTIFIER_ERROR_INJECTION
+ tristate "Notifier error injection"
+ depends on DEBUG_KERNEL
+ select DEBUG_FS
+ help
+ This option provides the ability to inject artifical errors to
+ specified notifier chain callbacks. It is useful to test the error
+ handling of notifier call chain failures.
+
+ Say N if unsure.
+
config CPU_NOTIFIER_ERROR_INJECT
tristate "CPU notifier error injection module"
- depends on HOTPLUG_CPU && DEBUG_KERNEL
+ depends on HOTPLUG_CPU && NOTIFIER_ERROR_INJECTION
help
This option provides a kernel module that can be used to test
- the error handling of the cpu notifiers
+ the error handling of the cpu notifiers by injecting artifical
+ errors to CPU notifier chain callbacks. It is controlled through
+ debugfs interface under /sys/kernel/debug/notifier-error-inject/cpu
+
+ If the notifier call chain should be failed with some events
+ notified, write the error code to "actions/<notifier event>/error".
+
+ Example: Inject CPU offline error (-1 == -EPERM)
+
+ # cd /sys/kernel/debug/notifier-error-inject/cpu
+ # echo -1 > actions/CPU_DOWN_PREPARE/error
+ # echo 0 > /sys/devices/system/cpu/cpu1/online
+ bash: echo: write error: Operation not permitted
To compile this code as a module, choose M here: the module will
be called cpu-notifier-error-inject.
If unsure, say N.
+config PM_NOTIFIER_ERROR_INJECT
+ tristate "PM notifier error injection module"
+ depends on PM && NOTIFIER_ERROR_INJECTION
+ default m if PM_DEBUG
+ help
+ This option provides the ability to inject artifical errors to
+ PM notifier chain callbacks. It is controlled through debugfs
+ interface /sys/kernel/debug/notifier-error-inject/pm
+
+ If the notifier call chain should be failed with some events
+ notified, write the error code to "actions/<notifier event>/error".
+
+ Example: Inject PM suspend error (-12 = -ENOMEM)
+
+ # cd /sys/kernel/debug/notifier-error-inject/pm/
+ # echo -12 > actions/PM_SUSPEND_PREPARE/error
+ # echo mem > /sys/power/state
+ bash: echo: write error: Cannot allocate memory
+
+ To compile this code as a module, choose M here: the module will
+ be called pm-notifier-error-inject.
+
+ If unsure, say N.
+
+config MEMORY_NOTIFIER_ERROR_INJECT
+ tristate "Memory hotplug notifier error injection module"
+ depends on MEMORY_HOTPLUG_SPARSE && NOTIFIER_ERROR_INJECTION
+ help
+ This option provides the ability to inject artifical errors to
+ memory hotplug notifier chain callbacks. It is controlled through
+ debugfs interface under /sys/kernel/debug/notifier-error-inject/memory
+
+ If the notifier call chain should be failed with some events
+ notified, write the error code to "actions/<notifier event>/error".
+
+ Example: Inject memory hotplug offline error (-12 == -ENOMEM)
+
+ # cd /sys/kernel/debug/notifier-error-inject/memory
+ # echo -12 > actions/MEM_GOING_OFFLINE/error
+ # echo offline > /sys/devices/system/memory/memoryXXX/state
+ bash: echo: write error: Cannot allocate memory
+
+ To compile this code as a module, choose M here: the module will
+ be called pSeries-reconfig-notifier-error-inject.
+
+ If unsure, say N.
+
+config PSERIES_RECONFIG_NOTIFIER_ERROR_INJECT
+ tristate "pSeries reconfig notifier error injection module"
+ depends on PPC_PSERIES && NOTIFIER_ERROR_INJECTION
+ help
+ This option provides the ability to inject artifical errors to
+ pSeries reconfig notifier chain callbacks. It is controlled
+ through debugfs interface under
+ /sys/kernel/debug/notifier-error-inject/pSeries-reconfig/
+
+ If the notifier call chain should be failed with some events
+ notified, write the error code to "actions/<notifier event>/error".
+
+ To compile this code as a module, choose M here: the module will
+ be called memory-notifier-error-inject.
+
+ If unsure, say N.
+
config FAULT_INJECTION
bool "Fault-injection framework"
depends on DEBUG_KERNEL
diff --git a/lib/Makefile b/lib/Makefile
index 8c31a0cb75e9..42d283edc4d3 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -11,7 +11,7 @@ lib-y := ctype.o string.o vsprintf.o cmdline.o \
rbtree.o radix-tree.o dump_stack.o timerqueue.o\
idr.o int_sqrt.o extable.o prio_tree.o \
sha1.o md5.o irq_regs.o reciprocal_div.o argv_split.o \
- proportions.o prio_heap.o ratelimit.o show_mem.o \
+ proportions.o flex_proportions.o prio_heap.o ratelimit.o show_mem.o \
is_single_threaded.o plist.o decompress.o
lib-$(CONFIG_MMU) += ioremap.o
@@ -22,7 +22,7 @@ lib-y += kobject.o klist.o
obj-y += bcd.o div64.o sort.o parser.o halfmd4.o debug_locks.o random32.o \
bust_spinlocks.o hexdump.o kasprintf.o bitmap.o scatterlist.o \
string_helpers.o gcd.o lcm.o list_sort.o uuid.o flex_array.o \
- bsearch.o find_last_bit.o find_next_bit.o llist.o
+ bsearch.o find_last_bit.o find_next_bit.o llist.o memweight.o
obj-y += kstrtox.o
obj-$(CONFIG_TEST_KSTRTOX) += test-kstrtox.o
@@ -90,7 +90,12 @@ obj-$(CONFIG_AUDIT_GENERIC) += audit.o
obj-$(CONFIG_SWIOTLB) += swiotlb.o
obj-$(CONFIG_IOMMU_HELPER) += iommu-helper.o
obj-$(CONFIG_FAULT_INJECTION) += fault-inject.o
+obj-$(CONFIG_NOTIFIER_ERROR_INJECTION) += notifier-error-inject.o
obj-$(CONFIG_CPU_NOTIFIER_ERROR_INJECT) += cpu-notifier-error-inject.o
+obj-$(CONFIG_PM_NOTIFIER_ERROR_INJECT) += pm-notifier-error-inject.o
+obj-$(CONFIG_MEMORY_NOTIFIER_ERROR_INJECT) += memory-notifier-error-inject.o
+obj-$(CONFIG_PSERIES_RECONFIG_NOTIFIER_ERROR_INJECT) += \
+ pSeries-reconfig-notifier-error-inject.o
lib-$(CONFIG_GENERIC_BUG) += bug.o
@@ -130,6 +135,11 @@ obj-$(CONFIG_GENERIC_STRNLEN_USER) += strnlen_user.o
obj-$(CONFIG_STMP_DEVICE) += stmp_device.o
+libfdt_files = fdt.o fdt_ro.o fdt_wip.o fdt_rw.o fdt_sw.o fdt_strerror.o
+$(foreach file, $(libfdt_files), \
+ $(eval CFLAGS_$(file) = -I$(src)/../scripts/dtc/libfdt))
+lib-$(CONFIG_LIBFDT) += $(libfdt_files)
+
hostprogs-y := gen_crc32table
clean-files := crc32table.h
diff --git a/lib/atomic64_test.c b/lib/atomic64_test.c
index cb99b91c3a1d..00bca223d1e1 100644
--- a/lib/atomic64_test.c
+++ b/lib/atomic64_test.c
@@ -114,8 +114,7 @@ static __init int test_atomic64(void)
r += one;
BUG_ON(v.counter != r);
-#if defined(CONFIG_X86) || defined(CONFIG_MIPS) || defined(CONFIG_PPC) || \
- defined(CONFIG_S390) || defined(_ASM_GENERIC_ATOMIC64_H) || defined(CONFIG_ARM)
+#ifdef CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
INIT(onestwos);
BUG_ON(atomic64_dec_if_positive(&v) != (onestwos - 1));
r -= one;
@@ -129,7 +128,7 @@ static __init int test_atomic64(void)
BUG_ON(atomic64_dec_if_positive(&v) != (-one - one));
BUG_ON(v.counter != r);
#else
-#warning Please implement atomic64_dec_if_positive for your architecture, and add it to the IF above
+#warning Please implement atomic64_dec_if_positive for your architecture and select the above Kconfig symbol
#endif
INIT(onestwos);
diff --git a/lib/cpu-notifier-error-inject.c b/lib/cpu-notifier-error-inject.c
index 4dc20321b0d5..707ca24f7b18 100644
--- a/lib/cpu-notifier-error-inject.c
+++ b/lib/cpu-notifier-error-inject.c
@@ -1,58 +1,45 @@
#include <linux/kernel.h>
-#include <linux/cpu.h>
#include <linux/module.h>
-#include <linux/notifier.h>
+#include <linux/cpu.h>
-static int priority;
-static int cpu_up_prepare_error;
-static int cpu_down_prepare_error;
+#include "notifier-error-inject.h"
+static int priority;
module_param(priority, int, 0);
MODULE_PARM_DESC(priority, "specify cpu notifier priority");
-module_param(cpu_up_prepare_error, int, 0644);
-MODULE_PARM_DESC(cpu_up_prepare_error,
- "specify error code to inject CPU_UP_PREPARE action");
-
-module_param(cpu_down_prepare_error, int, 0644);
-MODULE_PARM_DESC(cpu_down_prepare_error,
- "specify error code to inject CPU_DOWN_PREPARE action");
-
-static int err_inject_cpu_callback(struct notifier_block *nfb,
- unsigned long action, void *hcpu)
-{
- int err = 0;
-
- switch (action) {
- case CPU_UP_PREPARE:
- case CPU_UP_PREPARE_FROZEN:
- err = cpu_up_prepare_error;
- break;
- case CPU_DOWN_PREPARE:
- case CPU_DOWN_PREPARE_FROZEN:
- err = cpu_down_prepare_error;
- break;
+static struct notifier_err_inject cpu_notifier_err_inject = {
+ .actions = {
+ { NOTIFIER_ERR_INJECT_ACTION(CPU_UP_PREPARE) },
+ { NOTIFIER_ERR_INJECT_ACTION(CPU_UP_PREPARE_FROZEN) },
+ { NOTIFIER_ERR_INJECT_ACTION(CPU_DOWN_PREPARE) },
+ { NOTIFIER_ERR_INJECT_ACTION(CPU_DOWN_PREPARE_FROZEN) },
+ {}
}
- if (err)
- printk(KERN_INFO "Injecting error (%d) at cpu notifier\n", err);
-
- return notifier_from_errno(err);
-}
-
-static struct notifier_block err_inject_cpu_notifier = {
- .notifier_call = err_inject_cpu_callback,
};
+static struct dentry *dir;
+
static int err_inject_init(void)
{
- err_inject_cpu_notifier.priority = priority;
+ int err;
+
+ dir = notifier_err_inject_init("cpu", notifier_err_inject_dir,
+ &cpu_notifier_err_inject, priority);
+ if (IS_ERR(dir))
+ return PTR_ERR(dir);
+
+ err = register_hotcpu_notifier(&cpu_notifier_err_inject.nb);
+ if (err)
+ debugfs_remove_recursive(dir);
- return register_hotcpu_notifier(&err_inject_cpu_notifier);
+ return err;
}
static void err_inject_exit(void)
{
- unregister_hotcpu_notifier(&err_inject_cpu_notifier);
+ unregister_hotcpu_notifier(&cpu_notifier_err_inject.nb);
+ debugfs_remove_recursive(dir);
}
module_init(err_inject_init);
diff --git a/lib/crc32.c b/lib/crc32.c
index b0d278fb1d91..61774b8db4de 100644
--- a/lib/crc32.c
+++ b/lib/crc32.c
@@ -74,7 +74,9 @@ crc32_body(u32 crc, unsigned char const *buf, size_t len, const u32 (*tab)[256])
size_t i;
# endif
const u32 *t0=tab[0], *t1=tab[1], *t2=tab[2], *t3=tab[3];
+# if CRC_LE_BITS != 32
const u32 *t4 = tab[4], *t5 = tab[5], *t6 = tab[6], *t7 = tab[7];
+# endif
u32 q;
/* Align it */
diff --git a/lib/fdt.c b/lib/fdt.c
new file mode 100644
index 000000000000..97f20069fc37
--- /dev/null
+++ b/lib/fdt.c
@@ -0,0 +1,2 @@
+#include <linux/libfdt_env.h>
+#include "../scripts/dtc/libfdt/fdt.c"
diff --git a/lib/fdt_ro.c b/lib/fdt_ro.c
new file mode 100644
index 000000000000..f73c04ea7be4
--- /dev/null
+++ b/lib/fdt_ro.c
@@ -0,0 +1,2 @@
+#include <linux/libfdt_env.h>
+#include "../scripts/dtc/libfdt/fdt_ro.c"
diff --git a/lib/fdt_rw.c b/lib/fdt_rw.c
new file mode 100644
index 000000000000..0c1f0f4a4b13
--- /dev/null
+++ b/lib/fdt_rw.c
@@ -0,0 +1,2 @@
+#include <linux/libfdt_env.h>
+#include "../scripts/dtc/libfdt/fdt_rw.c"
diff --git a/lib/fdt_strerror.c b/lib/fdt_strerror.c
new file mode 100644
index 000000000000..8713e3ff4707
--- /dev/null
+++ b/lib/fdt_strerror.c
@@ -0,0 +1,2 @@
+#include <linux/libfdt_env.h>
+#include "../scripts/dtc/libfdt/fdt_strerror.c"
diff --git a/lib/fdt_sw.c b/lib/fdt_sw.c
new file mode 100644
index 000000000000..9ac7e50c76ce
--- /dev/null
+++ b/lib/fdt_sw.c
@@ -0,0 +1,2 @@
+#include <linux/libfdt_env.h>
+#include "../scripts/dtc/libfdt/fdt_sw.c"
diff --git a/lib/fdt_wip.c b/lib/fdt_wip.c
new file mode 100644
index 000000000000..45b3fc3d3ba1
--- /dev/null
+++ b/lib/fdt_wip.c
@@ -0,0 +1,2 @@
+#include <linux/libfdt_env.h>
+#include "../scripts/dtc/libfdt/fdt_wip.c"
diff --git a/lib/flex_proportions.c b/lib/flex_proportions.c
new file mode 100644
index 000000000000..c785554f9523
--- /dev/null
+++ b/lib/flex_proportions.c
@@ -0,0 +1,272 @@
+/*
+ * Floating proportions with flexible aging period
+ *
+ * Copyright (C) 2011, SUSE, Jan Kara <jack@suse.cz>
+ *
+ * The goal of this code is: Given different types of event, measure proportion
+ * of each type of event over time. The proportions are measured with
+ * exponentially decaying history to give smooth transitions. A formula
+ * expressing proportion of event of type 'j' is:
+ *
+ * p_{j} = (\Sum_{i>=0} x_{i,j}/2^{i+1})/(\Sum_{i>=0} x_i/2^{i+1})
+ *
+ * Where x_{i,j} is j's number of events in i-th last time period and x_i is
+ * total number of events in i-th last time period.
+ *
+ * Note that p_{j}'s are normalised, i.e.
+ *
+ * \Sum_{j} p_{j} = 1,
+ *
+ * This formula can be straightforwardly computed by maintaing denominator
+ * (let's call it 'd') and for each event type its numerator (let's call it
+ * 'n_j'). When an event of type 'j' happens, we simply need to do:
+ * n_j++; d++;
+ *
+ * When a new period is declared, we could do:
+ * d /= 2
+ * for each j
+ * n_j /= 2
+ *
+ * To avoid iteration over all event types, we instead shift numerator of event
+ * j lazily when someone asks for a proportion of event j or when event j
+ * occurs. This can bit trivially implemented by remembering last period in
+ * which something happened with proportion of type j.
+ */
+#include <linux/flex_proportions.h>
+
+int fprop_global_init(struct fprop_global *p)
+{
+ int err;
+
+ p->period = 0;
+ /* Use 1 to avoid dealing with periods with 0 events... */
+ err = percpu_counter_init(&p->events, 1);
+ if (err)
+ return err;
+ seqcount_init(&p->sequence);
+ return 0;
+}
+
+void fprop_global_destroy(struct fprop_global *p)
+{
+ percpu_counter_destroy(&p->events);
+}
+
+/*
+ * Declare @periods new periods. It is upto the caller to make sure period
+ * transitions cannot happen in parallel.
+ *
+ * The function returns true if the proportions are still defined and false
+ * if aging zeroed out all events. This can be used to detect whether declaring
+ * further periods has any effect.
+ */
+bool fprop_new_period(struct fprop_global *p, int periods)
+{
+ u64 events;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ events = percpu_counter_sum(&p->events);
+ /*
+ * Don't do anything if there are no events.
+ */
+ if (events <= 1) {
+ local_irq_restore(flags);
+ return false;
+ }
+ write_seqcount_begin(&p->sequence);
+ if (periods < 64)
+ events -= events >> periods;
+ /* Use addition to avoid losing events happening between sum and set */
+ percpu_counter_add(&p->events, -events);
+ p->period += periods;
+ write_seqcount_end(&p->sequence);
+ local_irq_restore(flags);
+
+ return true;
+}
+
+/*
+ * ---- SINGLE ----
+ */
+
+int fprop_local_init_single(struct fprop_local_single *pl)
+{
+ pl->events = 0;
+ pl->period = 0;
+ raw_spin_lock_init(&pl->lock);
+ return 0;
+}
+
+void fprop_local_destroy_single(struct fprop_local_single *pl)
+{
+}
+
+static void fprop_reflect_period_single(struct fprop_global *p,
+ struct fprop_local_single *pl)
+{
+ unsigned int period = p->period;
+ unsigned long flags;
+
+ /* Fast path - period didn't change */
+ if (pl->period == period)
+ return;
+ raw_spin_lock_irqsave(&pl->lock, flags);
+ /* Someone updated pl->period while we were spinning? */
+ if (pl->period >= period) {
+ raw_spin_unlock_irqrestore(&pl->lock, flags);
+ return;
+ }
+ /* Aging zeroed our fraction? */
+ if (period - pl->period < BITS_PER_LONG)
+ pl->events >>= period - pl->period;
+ else
+ pl->events = 0;
+ pl->period = period;
+ raw_spin_unlock_irqrestore(&pl->lock, flags);
+}
+
+/* Event of type pl happened */
+void __fprop_inc_single(struct fprop_global *p, struct fprop_local_single *pl)
+{
+ fprop_reflect_period_single(p, pl);
+ pl->events++;
+ percpu_counter_add(&p->events, 1);
+}
+
+/* Return fraction of events of type pl */
+void fprop_fraction_single(struct fprop_global *p,
+ struct fprop_local_single *pl,
+ unsigned long *numerator, unsigned long *denominator)
+{
+ unsigned int seq;
+ s64 num, den;
+
+ do {
+ seq = read_seqcount_begin(&p->sequence);
+ fprop_reflect_period_single(p, pl);
+ num = pl->events;
+ den = percpu_counter_read_positive(&p->events);
+ } while (read_seqcount_retry(&p->sequence, seq));
+
+ /*
+ * Make fraction <= 1 and denominator > 0 even in presence of percpu
+ * counter errors
+ */
+ if (den <= num) {
+ if (num)
+ den = num;
+ else
+ den = 1;
+ }
+ *denominator = den;
+ *numerator = num;
+}
+
+/*
+ * ---- PERCPU ----
+ */
+#define PROP_BATCH (8*(1+ilog2(nr_cpu_ids)))
+
+int fprop_local_init_percpu(struct fprop_local_percpu *pl)
+{
+ int err;
+
+ err = percpu_counter_init(&pl->events, 0);
+ if (err)
+ return err;
+ pl->period = 0;
+ raw_spin_lock_init(&pl->lock);
+ return 0;
+}
+
+void fprop_local_destroy_percpu(struct fprop_local_percpu *pl)
+{
+ percpu_counter_destroy(&pl->events);
+}
+
+static void fprop_reflect_period_percpu(struct fprop_global *p,
+ struct fprop_local_percpu *pl)
+{
+ unsigned int period = p->period;
+ unsigned long flags;
+
+ /* Fast path - period didn't change */
+ if (pl->period == period)
+ return;
+ raw_spin_lock_irqsave(&pl->lock, flags);
+ /* Someone updated pl->period while we were spinning? */
+ if (pl->period >= period) {
+ raw_spin_unlock_irqrestore(&pl->lock, flags);
+ return;
+ }
+ /* Aging zeroed our fraction? */
+ if (period - pl->period < BITS_PER_LONG) {
+ s64 val = percpu_counter_read(&pl->events);
+
+ if (val < (nr_cpu_ids * PROP_BATCH))
+ val = percpu_counter_sum(&pl->events);
+
+ __percpu_counter_add(&pl->events,
+ -val + (val >> (period-pl->period)), PROP_BATCH);
+ } else
+ percpu_counter_set(&pl->events, 0);
+ pl->period = period;
+ raw_spin_unlock_irqrestore(&pl->lock, flags);
+}
+
+/* Event of type pl happened */
+void __fprop_inc_percpu(struct fprop_global *p, struct fprop_local_percpu *pl)
+{
+ fprop_reflect_period_percpu(p, pl);
+ __percpu_counter_add(&pl->events, 1, PROP_BATCH);
+ percpu_counter_add(&p->events, 1);
+}
+
+void fprop_fraction_percpu(struct fprop_global *p,
+ struct fprop_local_percpu *pl,
+ unsigned long *numerator, unsigned long *denominator)
+{
+ unsigned int seq;
+ s64 num, den;
+
+ do {
+ seq = read_seqcount_begin(&p->sequence);
+ fprop_reflect_period_percpu(p, pl);
+ num = percpu_counter_read_positive(&pl->events);
+ den = percpu_counter_read_positive(&p->events);
+ } while (read_seqcount_retry(&p->sequence, seq));
+
+ /*
+ * Make fraction <= 1 and denominator > 0 even in presence of percpu
+ * counter errors
+ */
+ if (den <= num) {
+ if (num)
+ den = num;
+ else
+ den = 1;
+ }
+ *denominator = den;
+ *numerator = num;
+}
+
+/*
+ * Like __fprop_inc_percpu() except that event is counted only if the given
+ * type has fraction smaller than @max_frac/FPROP_FRAC_BASE
+ */
+void __fprop_inc_percpu_max(struct fprop_global *p,
+ struct fprop_local_percpu *pl, int max_frac)
+{
+ if (unlikely(max_frac < FPROP_FRAC_BASE)) {
+ unsigned long numerator, denominator;
+
+ fprop_fraction_percpu(p, pl, &numerator, &denominator);
+ if (numerator >
+ (((u64)denominator) * max_frac) >> FPROP_FRAC_SHIFT)
+ return;
+ } else
+ fprop_reflect_period_percpu(p, pl);
+ __percpu_counter_add(&pl->events, 1, PROP_BATCH);
+ percpu_counter_add(&p->events, 1);
+}
diff --git a/lib/memory-notifier-error-inject.c b/lib/memory-notifier-error-inject.c
new file mode 100644
index 000000000000..e6239bf0b0df
--- /dev/null
+++ b/lib/memory-notifier-error-inject.c
@@ -0,0 +1,48 @@
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/memory.h>
+
+#include "notifier-error-inject.h"
+
+static int priority;
+module_param(priority, int, 0);
+MODULE_PARM_DESC(priority, "specify memory notifier priority");
+
+static struct notifier_err_inject memory_notifier_err_inject = {
+ .actions = {
+ { NOTIFIER_ERR_INJECT_ACTION(MEM_GOING_ONLINE) },
+ { NOTIFIER_ERR_INJECT_ACTION(MEM_GOING_OFFLINE) },
+ {}
+ }
+};
+
+static struct dentry *dir;
+
+static int err_inject_init(void)
+{
+ int err;
+
+ dir = notifier_err_inject_init("memory", notifier_err_inject_dir,
+ &memory_notifier_err_inject, priority);
+ if (IS_ERR(dir))
+ return PTR_ERR(dir);
+
+ err = register_memory_notifier(&memory_notifier_err_inject.nb);
+ if (err)
+ debugfs_remove_recursive(dir);
+
+ return err;
+}
+
+static void err_inject_exit(void)
+{
+ unregister_memory_notifier(&memory_notifier_err_inject.nb);
+ debugfs_remove_recursive(dir);
+}
+
+module_init(err_inject_init);
+module_exit(err_inject_exit);
+
+MODULE_DESCRIPTION("memory notifier error injection module");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>");
diff --git a/lib/memweight.c b/lib/memweight.c
new file mode 100644
index 000000000000..e35fc8771893
--- /dev/null
+++ b/lib/memweight.c
@@ -0,0 +1,38 @@
+#include <linux/export.h>
+#include <linux/bug.h>
+#include <linux/bitmap.h>
+
+/**
+ * memweight - count the total number of bits set in memory area
+ * @ptr: pointer to the start of the area
+ * @bytes: the size of the area
+ */
+size_t memweight(const void *ptr, size_t bytes)
+{
+ size_t ret = 0;
+ size_t longs;
+ const unsigned char *bitmap = ptr;
+
+ for (; bytes > 0 && ((unsigned long)bitmap) % sizeof(long);
+ bytes--, bitmap++)
+ ret += hweight8(*bitmap);
+
+ longs = bytes / sizeof(long);
+ if (longs) {
+ BUG_ON(longs >= INT_MAX / BITS_PER_LONG);
+ ret += bitmap_weight((unsigned long *)bitmap,
+ longs * BITS_PER_LONG);
+ bytes -= longs * sizeof(long);
+ bitmap += longs * sizeof(long);
+ }
+ /*
+ * The reason that this last loop is distinct from the preceding
+ * bitmap_weight() call is to compute 1-bits in the last region smaller
+ * than sizeof(long) properly on big-endian systems.
+ */
+ for (; bytes > 0; bytes--, bitmap++)
+ ret += hweight8(*bitmap);
+
+ return ret;
+}
+EXPORT_SYMBOL(memweight);
diff --git a/lib/notifier-error-inject.c b/lib/notifier-error-inject.c
new file mode 100644
index 000000000000..44b92cb6224f
--- /dev/null
+++ b/lib/notifier-error-inject.c
@@ -0,0 +1,112 @@
+#include <linux/module.h>
+
+#include "notifier-error-inject.h"
+
+static int debugfs_errno_set(void *data, u64 val)
+{
+ *(int *)data = clamp_t(int, val, -MAX_ERRNO, 0);
+ return 0;
+}
+
+static int debugfs_errno_get(void *data, u64 *val)
+{
+ *val = *(int *)data;
+ return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(fops_errno, debugfs_errno_get, debugfs_errno_set,
+ "%lld\n");
+
+static struct dentry *debugfs_create_errno(const char *name, mode_t mode,
+ struct dentry *parent, int *value)
+{
+ return debugfs_create_file(name, mode, parent, value, &fops_errno);
+}
+
+static int notifier_err_inject_callback(struct notifier_block *nb,
+ unsigned long val, void *p)
+{
+ int err = 0;
+ struct notifier_err_inject *err_inject =
+ container_of(nb, struct notifier_err_inject, nb);
+ struct notifier_err_inject_action *action;
+
+ for (action = err_inject->actions; action->name; action++) {
+ if (action->val == val) {
+ err = action->error;
+ break;
+ }
+ }
+ if (err)
+ pr_info("Injecting error (%d) to %s\n", err, action->name);
+
+ return notifier_from_errno(err);
+}
+
+struct dentry *notifier_err_inject_dir;
+EXPORT_SYMBOL_GPL(notifier_err_inject_dir);
+
+struct dentry *notifier_err_inject_init(const char *name, struct dentry *parent,
+ struct notifier_err_inject *err_inject, int priority)
+{
+ struct notifier_err_inject_action *action;
+ mode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
+ struct dentry *dir;
+ struct dentry *actions_dir;
+
+ err_inject->nb.notifier_call = notifier_err_inject_callback;
+ err_inject->nb.priority = priority;
+
+ dir = debugfs_create_dir(name, parent);
+ if (!dir)
+ return ERR_PTR(-ENOMEM);
+
+ actions_dir = debugfs_create_dir("actions", dir);
+ if (!actions_dir)
+ goto fail;
+
+ for (action = err_inject->actions; action->name; action++) {
+ struct dentry *action_dir;
+
+ action_dir = debugfs_create_dir(action->name, actions_dir);
+ if (!action_dir)
+ goto fail;
+
+ /*
+ * Create debugfs r/w file containing action->error. If
+ * notifier call chain is called with action->val, it will
+ * fail with the error code
+ */
+ if (!debugfs_create_errno("error", mode, action_dir,
+ &action->error))
+ goto fail;
+ }
+ return dir;
+fail:
+ debugfs_remove_recursive(dir);
+ return ERR_PTR(-ENOMEM);
+}
+EXPORT_SYMBOL_GPL(notifier_err_inject_init);
+
+static int __init err_inject_init(void)
+{
+ notifier_err_inject_dir =
+ debugfs_create_dir("notifier-error-inject", NULL);
+
+ if (!notifier_err_inject_dir)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static void __exit err_inject_exit(void)
+{
+ debugfs_remove_recursive(notifier_err_inject_dir);
+}
+
+module_init(err_inject_init);
+module_exit(err_inject_exit);
+
+MODULE_DESCRIPTION("Notifier error injection module");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>");
diff --git a/lib/notifier-error-inject.h b/lib/notifier-error-inject.h
new file mode 100644
index 000000000000..99b3b6fc470b
--- /dev/null
+++ b/lib/notifier-error-inject.h
@@ -0,0 +1,24 @@
+#include <linux/atomic.h>
+#include <linux/debugfs.h>
+#include <linux/notifier.h>
+
+struct notifier_err_inject_action {
+ unsigned long val;
+ int error;
+ const char *name;
+};
+
+#define NOTIFIER_ERR_INJECT_ACTION(action) \
+ .name = #action, .val = (action),
+
+struct notifier_err_inject {
+ struct notifier_block nb;
+ struct notifier_err_inject_action actions[];
+ /* The last slot must be terminated with zero sentinel */
+};
+
+extern struct dentry *notifier_err_inject_dir;
+
+extern struct dentry *notifier_err_inject_init(const char *name,
+ struct dentry *parent, struct notifier_err_inject *err_inject,
+ int priority);
diff --git a/lib/pSeries-reconfig-notifier-error-inject.c b/lib/pSeries-reconfig-notifier-error-inject.c
new file mode 100644
index 000000000000..7f7c98dcd5c4
--- /dev/null
+++ b/lib/pSeries-reconfig-notifier-error-inject.c
@@ -0,0 +1,51 @@
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+#include <asm/pSeries_reconfig.h>
+
+#include "notifier-error-inject.h"
+
+static int priority;
+module_param(priority, int, 0);
+MODULE_PARM_DESC(priority, "specify pSeries reconfig notifier priority");
+
+static struct notifier_err_inject reconfig_err_inject = {
+ .actions = {
+ { NOTIFIER_ERR_INJECT_ACTION(PSERIES_RECONFIG_ADD) },
+ { NOTIFIER_ERR_INJECT_ACTION(PSERIES_RECONFIG_REMOVE) },
+ { NOTIFIER_ERR_INJECT_ACTION(PSERIES_DRCONF_MEM_ADD) },
+ { NOTIFIER_ERR_INJECT_ACTION(PSERIES_DRCONF_MEM_REMOVE) },
+ {}
+ }
+};
+
+static struct dentry *dir;
+
+static int err_inject_init(void)
+{
+ int err;
+
+ dir = notifier_err_inject_init("pSeries-reconfig",
+ notifier_err_inject_dir, &reconfig_err_inject, priority);
+ if (IS_ERR(dir))
+ return PTR_ERR(dir);
+
+ err = pSeries_reconfig_notifier_register(&reconfig_err_inject.nb);
+ if (err)
+ debugfs_remove_recursive(dir);
+
+ return err;
+}
+
+static void err_inject_exit(void)
+{
+ pSeries_reconfig_notifier_unregister(&reconfig_err_inject.nb);
+ debugfs_remove_recursive(dir);
+}
+
+module_init(err_inject_init);
+module_exit(err_inject_exit);
+
+MODULE_DESCRIPTION("pSeries reconfig notifier error injection module");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>");
diff --git a/lib/percpu_counter.c b/lib/percpu_counter.c
index f8a3f1a829b8..ba6085d9c741 100644
--- a/lib/percpu_counter.c
+++ b/lib/percpu_counter.c
@@ -12,7 +12,7 @@
#ifdef CONFIG_HOTPLUG_CPU
static LIST_HEAD(percpu_counters);
-static DEFINE_MUTEX(percpu_counters_lock);
+static DEFINE_SPINLOCK(percpu_counters_lock);
#endif
#ifdef CONFIG_DEBUG_OBJECTS_PERCPU_COUNTER
@@ -123,9 +123,9 @@ int __percpu_counter_init(struct percpu_counter *fbc, s64 amount,
#ifdef CONFIG_HOTPLUG_CPU
INIT_LIST_HEAD(&fbc->list);
- mutex_lock(&percpu_counters_lock);
+ spin_lock(&percpu_counters_lock);
list_add(&fbc->list, &percpu_counters);
- mutex_unlock(&percpu_counters_lock);
+ spin_unlock(&percpu_counters_lock);
#endif
return 0;
}
@@ -139,9 +139,9 @@ void percpu_counter_destroy(struct percpu_counter *fbc)
debug_percpu_counter_deactivate(fbc);
#ifdef CONFIG_HOTPLUG_CPU
- mutex_lock(&percpu_counters_lock);
+ spin_lock(&percpu_counters_lock);
list_del(&fbc->list);
- mutex_unlock(&percpu_counters_lock);
+ spin_unlock(&percpu_counters_lock);
#endif
free_percpu(fbc->counters);
fbc->counters = NULL;
@@ -170,7 +170,7 @@ static int __cpuinit percpu_counter_hotcpu_callback(struct notifier_block *nb,
return NOTIFY_OK;
cpu = (unsigned long)hcpu;
- mutex_lock(&percpu_counters_lock);
+ spin_lock(&percpu_counters_lock);
list_for_each_entry(fbc, &percpu_counters, list) {
s32 *pcount;
unsigned long flags;
@@ -181,7 +181,7 @@ static int __cpuinit percpu_counter_hotcpu_callback(struct notifier_block *nb,
*pcount = 0;
raw_spin_unlock_irqrestore(&fbc->lock, flags);
}
- mutex_unlock(&percpu_counters_lock);
+ spin_unlock(&percpu_counters_lock);
#endif
return NOTIFY_OK;
}
diff --git a/lib/pm-notifier-error-inject.c b/lib/pm-notifier-error-inject.c
new file mode 100644
index 000000000000..c094b2dedc23
--- /dev/null
+++ b/lib/pm-notifier-error-inject.c
@@ -0,0 +1,49 @@
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/suspend.h>
+
+#include "notifier-error-inject.h"
+
+static int priority;
+module_param(priority, int, 0);
+MODULE_PARM_DESC(priority, "specify PM notifier priority");
+
+static struct notifier_err_inject pm_notifier_err_inject = {
+ .actions = {
+ { NOTIFIER_ERR_INJECT_ACTION(PM_HIBERNATION_PREPARE) },
+ { NOTIFIER_ERR_INJECT_ACTION(PM_SUSPEND_PREPARE) },
+ { NOTIFIER_ERR_INJECT_ACTION(PM_RESTORE_PREPARE) },
+ {}
+ }
+};
+
+static struct dentry *dir;
+
+static int err_inject_init(void)
+{
+ int err;
+
+ dir = notifier_err_inject_init("pm", notifier_err_inject_dir,
+ &pm_notifier_err_inject, priority);
+ if (IS_ERR(dir))
+ return PTR_ERR(dir);
+
+ err = register_pm_notifier(&pm_notifier_err_inject.nb);
+ if (err)
+ debugfs_remove_recursive(dir);
+
+ return err;
+}
+
+static void err_inject_exit(void)
+{
+ unregister_pm_notifier(&pm_notifier_err_inject.nb);
+ debugfs_remove_recursive(dir);
+}
+
+module_init(err_inject_init);
+module_exit(err_inject_exit);
+
+MODULE_DESCRIPTION("PM notifier error injection module");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>");
diff --git a/lib/scatterlist.c b/lib/scatterlist.c
index 6096e89bee55..fadae774a20c 100644
--- a/lib/scatterlist.c
+++ b/lib/scatterlist.c
@@ -279,14 +279,6 @@ int __sg_alloc_table(struct sg_table *table, unsigned int nents,
if (!left)
sg_mark_end(&sg[sg_size - 1]);
- /*
- * only really needed for mempool backed sg allocations (like
- * SCSI), a possible improvement here would be to pass the
- * table pointer into the allocator and let that clear these
- * flags
- */
- gfp_mask &= ~__GFP_WAIT;
- gfp_mask |= __GFP_HIGH;
prv = sg;
} while (left);
@@ -319,6 +311,70 @@ int sg_alloc_table(struct sg_table *table, unsigned int nents, gfp_t gfp_mask)
EXPORT_SYMBOL(sg_alloc_table);
/**
+ * sg_alloc_table_from_pages - Allocate and initialize an sg table from
+ * an array of pages
+ * @sgt: The sg table header to use
+ * @pages: Pointer to an array of page pointers
+ * @n_pages: Number of pages in the pages array
+ * @offset: Offset from start of the first page to the start of a buffer
+ * @size: Number of valid bytes in the buffer (after offset)
+ * @gfp_mask: GFP allocation mask
+ *
+ * Description:
+ * Allocate and initialize an sg table from a list of pages. Contiguous
+ * ranges of the pages are squashed into a single scatterlist node. A user
+ * may provide an offset at a start and a size of valid data in a buffer
+ * specified by the page array. The returned sg table is released by
+ * sg_free_table.
+ *
+ * Returns:
+ * 0 on success, negative error on failure
+ */
+int sg_alloc_table_from_pages(struct sg_table *sgt,
+ struct page **pages, unsigned int n_pages,
+ unsigned long offset, unsigned long size,
+ gfp_t gfp_mask)
+{
+ unsigned int chunks;
+ unsigned int i;
+ unsigned int cur_page;
+ int ret;
+ struct scatterlist *s;
+
+ /* compute number of contiguous chunks */
+ chunks = 1;
+ for (i = 1; i < n_pages; ++i)
+ if (page_to_pfn(pages[i]) != page_to_pfn(pages[i - 1]) + 1)
+ ++chunks;
+
+ ret = sg_alloc_table(sgt, chunks, gfp_mask);
+ if (unlikely(ret))
+ return ret;
+
+ /* merging chunks and putting them into the scatterlist */
+ cur_page = 0;
+ for_each_sg(sgt->sgl, s, sgt->orig_nents, i) {
+ unsigned long chunk_size;
+ unsigned int j;
+
+ /* look for the end of the current chunk */
+ for (j = cur_page + 1; j < n_pages; ++j)
+ if (page_to_pfn(pages[j]) !=
+ page_to_pfn(pages[j - 1]) + 1)
+ break;
+
+ chunk_size = ((j - cur_page) << PAGE_SHIFT) - offset;
+ sg_set_page(s, pages[cur_page], min(size, chunk_size), offset);
+ size -= chunk_size;
+ offset = 0;
+ cur_page = j;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(sg_alloc_table_from_pages);
+
+/**
* sg_miter_start - start mapping iteration over a sg list
* @miter: sg mapping iter to be started
* @sgl: sg list to iterate over
diff --git a/lib/spinlock_debug.c b/lib/spinlock_debug.c
index e91fbc23fff1..eb10578ae055 100644
--- a/lib/spinlock_debug.c
+++ b/lib/spinlock_debug.c
@@ -58,7 +58,7 @@ static void spin_dump(raw_spinlock_t *lock, const char *msg)
printk(KERN_EMERG "BUG: spinlock %s on CPU#%d, %s/%d\n",
msg, raw_smp_processor_id(),
current->comm, task_pid_nr(current));
- printk(KERN_EMERG " lock: %ps, .magic: %08x, .owner: %s/%d, "
+ printk(KERN_EMERG " lock: %pS, .magic: %08x, .owner: %s/%d, "
".owner_cpu: %d\n",
lock, lock->magic,
owner ? owner->comm : "<none>",
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index c3f36d415bdf..0e337541f005 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -655,6 +655,50 @@ char *resource_string(char *buf, char *end, struct resource *res,
}
static noinline_for_stack
+char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
+ const char *fmt)
+{
+ int i, len = 1; /* if we pass '%ph[CDN]', field witdh remains
+ negative value, fallback to the default */
+ char separator;
+
+ if (spec.field_width == 0)
+ /* nothing to print */
+ return buf;
+
+ if (ZERO_OR_NULL_PTR(addr))
+ /* NULL pointer */
+ return string(buf, end, NULL, spec);
+
+ switch (fmt[1]) {
+ case 'C':
+ separator = ':';
+ break;
+ case 'D':
+ separator = '-';
+ break;
+ case 'N':
+ separator = 0;
+ break;
+ default:
+ separator = ' ';
+ break;
+ }
+
+ if (spec.field_width > 0)
+ len = min_t(int, spec.field_width, 64);
+
+ for (i = 0; i < len && buf < end - 1; i++) {
+ buf = hex_byte_pack(buf, addr[i]);
+
+ if (buf < end && separator && i != len - 1)
+ *buf++ = separator;
+ }
+
+ return buf;
+}
+
+static noinline_for_stack
char *mac_address_string(char *buf, char *end, u8 *addr,
struct printf_spec spec, const char *fmt)
{
@@ -662,15 +706,28 @@ char *mac_address_string(char *buf, char *end, u8 *addr,
char *p = mac_addr;
int i;
char separator;
+ bool reversed = false;
- if (fmt[1] == 'F') { /* FDDI canonical format */
+ switch (fmt[1]) {
+ case 'F':
separator = '-';
- } else {
+ break;
+
+ case 'R':
+ reversed = true;
+ /* fall through */
+
+ default:
separator = ':';
+ break;
}
for (i = 0; i < 6; i++) {
- p = hex_byte_pack(p, addr[i]);
+ if (reversed)
+ p = hex_byte_pack(p, addr[5 - i]);
+ else
+ p = hex_byte_pack(p, addr[i]);
+
if (fmt[0] == 'M' && i != 5)
*p++ = separator;
}
@@ -933,6 +990,7 @@ int kptr_restrict __read_mostly;
* - 'm' For a 6-byte MAC address, it prints the hex address without colons
* - 'MF' For a 6-byte MAC FDDI address, it prints the address
* with a dash-separated hex notation
+ * - '[mM]R For a 6-byte MAC address, Reverse order (Bluetooth)
* - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
* IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
* IPv6 uses colon separated network-order 16 bit hex with leading 0's
@@ -960,6 +1018,13 @@ int kptr_restrict __read_mostly;
* correctness of the format string and va_list arguments.
* - 'K' For a kernel pointer that should be hidden from unprivileged users
* - 'NF' For a netdev_features_t
+ * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with
+ * a certain separator (' ' by default):
+ * C colon
+ * D dash
+ * N no separator
+ * The maximum supported length is 64 bytes of the input. Consider
+ * to use print_hex_dump() for the larger input.
*
* Note: The difference between 'S' and 'F' is that on ia64 and ppc64
* function pointers are really function descriptors, which contain a
@@ -993,9 +1058,12 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
case 'R':
case 'r':
return resource_string(buf, end, ptr, spec, fmt);
+ case 'h':
+ return hex_string(buf, end, ptr, spec, fmt);
case 'M': /* Colon separated: 00:01:02:03:04:05 */
case 'm': /* Contiguous: 000102030405 */
- /* [mM]F (FDDI, bit reversed) */
+ /* [mM]F (FDDI) */
+ /* [mM]R (Reverse order; Bluetooth) */
return mac_address_string(buf, end, ptr, spec, fmt);
case 'I': /* Formatted IP supported
* 4: 1.2.3.4
@@ -1030,7 +1098,8 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
* %pK cannot be used in IRQ context because its test
* for CAP_SYSLOG would be meaningless.
*/
- if (in_irq() || in_serving_softirq() || in_nmi()) {
+ if (kptr_restrict && (in_irq() || in_serving_softirq() ||
+ in_nmi())) {
if (spec.field_width == -1)
spec.field_width = default_width;
return string(buf, end, "pK-error", spec);
@@ -1280,8 +1349,12 @@ qualifier:
* %pI6c print an IPv6 address as specified by RFC 5952
* %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper
* case.
+ * %*ph[CDN] a variable-length hex string with a separator (supports up to 64
+ * bytes of the input)
* %n is ignored
*
+ * ** Please update Documentation/printk-formats.txt when making changes **
+ *
* The return value is the number of characters which would
* be generated for the given input, excluding the trailing
* '\0', as per ISO C99. If you want to have the exact