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-rw-r--r--lib/Kconfig3
-rw-r--r--lib/Makefile4
-rw-r--r--lib/debugobjects.c54
-rw-r--r--lib/devres.c55
-rw-r--r--lib/dynamic_queue_limits.c133
-rw-r--r--lib/kobject.c37
-rw-r--r--lib/kobject_uevent.c3
-rw-r--r--lib/kref.c97
-rw-r--r--lib/reciprocal_div.c2
-rw-r--r--lib/vsprintf.c19
10 files changed, 266 insertions, 141 deletions
diff --git a/lib/Kconfig b/lib/Kconfig
index 32f3e5ae2be..63b5782732e 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -244,6 +244,9 @@ config CPU_RMAP
bool
depends on SMP
+config DQL
+ bool
+
#
# Netlink attribute parsing support is select'ed if needed
#
diff --git a/lib/Makefile b/lib/Makefile
index a4da283f5dc..c0ffaaff653 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -17,7 +17,7 @@ lib-y := ctype.o string.o vsprintf.o cmdline.o \
lib-$(CONFIG_MMU) += ioremap.o
lib-$(CONFIG_SMP) += cpumask.o
-lib-y += kobject.o kref.o klist.o
+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 \
@@ -115,6 +115,8 @@ obj-$(CONFIG_CPU_RMAP) += cpu_rmap.o
obj-$(CONFIG_CORDIC) += cordic.o
+obj-$(CONFIG_DQL) += dynamic_queue_limits.o
+
hostprogs-y := gen_crc32table
clean-files := crc32table.h
diff --git a/lib/debugobjects.c b/lib/debugobjects.c
index a78b7c6e042..77cb245f8e7 100644
--- a/lib/debugobjects.c
+++ b/lib/debugobjects.c
@@ -268,12 +268,16 @@ static void debug_print_object(struct debug_obj *obj, char *msg)
* Try to repair the damage, so we have a better chance to get useful
* debug output.
*/
-static void
+static int
debug_object_fixup(int (*fixup)(void *addr, enum debug_obj_state state),
void * addr, enum debug_obj_state state)
{
+ int fixed = 0;
+
if (fixup)
- debug_objects_fixups += fixup(addr, state);
+ fixed = fixup(addr, state);
+ debug_objects_fixups += fixed;
+ return fixed;
}
static void debug_object_is_on_stack(void *addr, int onstack)
@@ -386,6 +390,9 @@ void debug_object_activate(void *addr, struct debug_obj_descr *descr)
struct debug_bucket *db;
struct debug_obj *obj;
unsigned long flags;
+ struct debug_obj o = { .object = addr,
+ .state = ODEBUG_STATE_NOTAVAILABLE,
+ .descr = descr };
if (!debug_objects_enabled)
return;
@@ -425,8 +432,9 @@ void debug_object_activate(void *addr, struct debug_obj_descr *descr)
* let the type specific code decide whether this is
* true or not.
*/
- debug_object_fixup(descr->fixup_activate, addr,
- ODEBUG_STATE_NOTAVAILABLE);
+ if (debug_object_fixup(descr->fixup_activate, addr,
+ ODEBUG_STATE_NOTAVAILABLE))
+ debug_print_object(&o, "activate");
}
/**
@@ -563,6 +571,44 @@ out_unlock:
}
/**
+ * debug_object_assert_init - debug checks when object should be init-ed
+ * @addr: address of the object
+ * @descr: pointer to an object specific debug description structure
+ */
+void debug_object_assert_init(void *addr, struct debug_obj_descr *descr)
+{
+ struct debug_bucket *db;
+ struct debug_obj *obj;
+ unsigned long flags;
+
+ if (!debug_objects_enabled)
+ return;
+
+ db = get_bucket((unsigned long) addr);
+
+ raw_spin_lock_irqsave(&db->lock, flags);
+
+ obj = lookup_object(addr, db);
+ if (!obj) {
+ struct debug_obj o = { .object = addr,
+ .state = ODEBUG_STATE_NOTAVAILABLE,
+ .descr = descr };
+
+ raw_spin_unlock_irqrestore(&db->lock, flags);
+ /*
+ * Maybe the object is static. Let the type specific
+ * code decide what to do.
+ */
+ if (debug_object_fixup(descr->fixup_assert_init, addr,
+ ODEBUG_STATE_NOTAVAILABLE))
+ debug_print_object(&o, "assert_init");
+ return;
+ }
+
+ raw_spin_unlock_irqrestore(&db->lock, flags);
+}
+
+/**
* debug_object_active_state - debug checks object usage state machine
* @addr: address of the object
* @descr: pointer to an object specific debug description structure
diff --git a/lib/devres.c b/lib/devres.c
index 7c0e953a748..4fbc09e6e9e 100644
--- a/lib/devres.c
+++ b/lib/devres.c
@@ -85,6 +85,57 @@ void devm_iounmap(struct device *dev, void __iomem *addr)
}
EXPORT_SYMBOL(devm_iounmap);
+/**
+ * devm_request_and_ioremap() - Check, request region, and ioremap resource
+ * @dev: Generic device to handle the resource for
+ * @res: resource to be handled
+ *
+ * Takes all necessary steps to ioremap a mem resource. Uses managed device, so
+ * everything is undone on driver detach. Checks arguments, so you can feed
+ * it the result from e.g. platform_get_resource() directly. Returns the
+ * remapped pointer or NULL on error. Usage example:
+ *
+ * res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ * base = devm_request_and_ioremap(&pdev->dev, res);
+ * if (!base)
+ * return -EADDRNOTAVAIL;
+ */
+void __iomem *devm_request_and_ioremap(struct device *dev,
+ struct resource *res)
+{
+ resource_size_t size;
+ const char *name;
+ void __iomem *dest_ptr;
+
+ BUG_ON(!dev);
+
+ if (!res || resource_type(res) != IORESOURCE_MEM) {
+ dev_err(dev, "invalid resource\n");
+ return NULL;
+ }
+
+ size = resource_size(res);
+ name = res->name ?: dev_name(dev);
+
+ if (!devm_request_mem_region(dev, res->start, size, name)) {
+ dev_err(dev, "can't request region for resource %pR\n", res);
+ return NULL;
+ }
+
+ if (res->flags & IORESOURCE_CACHEABLE)
+ dest_ptr = devm_ioremap(dev, res->start, size);
+ else
+ dest_ptr = devm_ioremap_nocache(dev, res->start, size);
+
+ if (!dest_ptr) {
+ dev_err(dev, "ioremap failed for resource %pR\n", res);
+ devm_release_mem_region(dev, res->start, size);
+ }
+
+ return dest_ptr;
+}
+EXPORT_SYMBOL(devm_request_and_ioremap);
+
#ifdef CONFIG_HAS_IOPORT
/*
* Generic iomap devres
@@ -348,5 +399,5 @@ void pcim_iounmap_regions(struct pci_dev *pdev, u16 mask)
}
}
EXPORT_SYMBOL(pcim_iounmap_regions);
-#endif
-#endif
+#endif /* CONFIG_PCI */
+#endif /* CONFIG_HAS_IOPORT */
diff --git a/lib/dynamic_queue_limits.c b/lib/dynamic_queue_limits.c
new file mode 100644
index 00000000000..3d1bdcdd7db
--- /dev/null
+++ b/lib/dynamic_queue_limits.c
@@ -0,0 +1,133 @@
+/*
+ * Dynamic byte queue limits. See include/linux/dynamic_queue_limits.h
+ *
+ * Copyright (c) 2011, Tom Herbert <therbert@google.com>
+ */
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/ctype.h>
+#include <linux/kernel.h>
+#include <linux/dynamic_queue_limits.h>
+
+#define POSDIFF(A, B) ((A) > (B) ? (A) - (B) : 0)
+
+/* Records completed count and recalculates the queue limit */
+void dql_completed(struct dql *dql, unsigned int count)
+{
+ unsigned int inprogress, prev_inprogress, limit;
+ unsigned int ovlimit, all_prev_completed, completed;
+
+ /* Can't complete more than what's in queue */
+ BUG_ON(count > dql->num_queued - dql->num_completed);
+
+ completed = dql->num_completed + count;
+ limit = dql->limit;
+ ovlimit = POSDIFF(dql->num_queued - dql->num_completed, limit);
+ inprogress = dql->num_queued - completed;
+ prev_inprogress = dql->prev_num_queued - dql->num_completed;
+ all_prev_completed = POSDIFF(completed, dql->prev_num_queued);
+
+ if ((ovlimit && !inprogress) ||
+ (dql->prev_ovlimit && all_prev_completed)) {
+ /*
+ * Queue considered starved if:
+ * - The queue was over-limit in the last interval,
+ * and there is no more data in the queue.
+ * OR
+ * - The queue was over-limit in the previous interval and
+ * when enqueuing it was possible that all queued data
+ * had been consumed. This covers the case when queue
+ * may have becomes starved between completion processing
+ * running and next time enqueue was scheduled.
+ *
+ * When queue is starved increase the limit by the amount
+ * of bytes both sent and completed in the last interval,
+ * plus any previous over-limit.
+ */
+ limit += POSDIFF(completed, dql->prev_num_queued) +
+ dql->prev_ovlimit;
+ dql->slack_start_time = jiffies;
+ dql->lowest_slack = UINT_MAX;
+ } else if (inprogress && prev_inprogress && !all_prev_completed) {
+ /*
+ * Queue was not starved, check if the limit can be decreased.
+ * A decrease is only considered if the queue has been busy in
+ * the whole interval (the check above).
+ *
+ * If there is slack, the amount of execess data queued above
+ * the the amount needed to prevent starvation, the queue limit
+ * can be decreased. To avoid hysteresis we consider the
+ * minimum amount of slack found over several iterations of the
+ * completion routine.
+ */
+ unsigned int slack, slack_last_objs;
+
+ /*
+ * Slack is the maximum of
+ * - The queue limit plus previous over-limit minus twice
+ * the number of objects completed. Note that two times
+ * number of completed bytes is a basis for an upper bound
+ * of the limit.
+ * - Portion of objects in the last queuing operation that
+ * was not part of non-zero previous over-limit. That is
+ * "round down" by non-overlimit portion of the last
+ * queueing operation.
+ */
+ slack = POSDIFF(limit + dql->prev_ovlimit,
+ 2 * (completed - dql->num_completed));
+ slack_last_objs = dql->prev_ovlimit ?
+ POSDIFF(dql->prev_last_obj_cnt, dql->prev_ovlimit) : 0;
+
+ slack = max(slack, slack_last_objs);
+
+ if (slack < dql->lowest_slack)
+ dql->lowest_slack = slack;
+
+ if (time_after(jiffies,
+ dql->slack_start_time + dql->slack_hold_time)) {
+ limit = POSDIFF(limit, dql->lowest_slack);
+ dql->slack_start_time = jiffies;
+ dql->lowest_slack = UINT_MAX;
+ }
+ }
+
+ /* Enforce bounds on limit */
+ limit = clamp(limit, dql->min_limit, dql->max_limit);
+
+ if (limit != dql->limit) {
+ dql->limit = limit;
+ ovlimit = 0;
+ }
+
+ dql->adj_limit = limit + completed;
+ dql->prev_ovlimit = ovlimit;
+ dql->prev_last_obj_cnt = dql->last_obj_cnt;
+ dql->num_completed = completed;
+ dql->prev_num_queued = dql->num_queued;
+}
+EXPORT_SYMBOL(dql_completed);
+
+void dql_reset(struct dql *dql)
+{
+ /* Reset all dynamic values */
+ dql->limit = 0;
+ dql->num_queued = 0;
+ dql->num_completed = 0;
+ dql->last_obj_cnt = 0;
+ dql->prev_num_queued = 0;
+ dql->prev_last_obj_cnt = 0;
+ dql->prev_ovlimit = 0;
+ dql->lowest_slack = UINT_MAX;
+ dql->slack_start_time = jiffies;
+}
+EXPORT_SYMBOL(dql_reset);
+
+int dql_init(struct dql *dql, unsigned hold_time)
+{
+ dql->max_limit = DQL_MAX_LIMIT;
+ dql->min_limit = 0;
+ dql->slack_hold_time = hold_time;
+ dql_reset(dql);
+ return 0;
+}
+EXPORT_SYMBOL(dql_init);
diff --git a/lib/kobject.c b/lib/kobject.c
index 640bd98a4c8..c33d7a18d63 100644
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -746,43 +746,11 @@ void kset_unregister(struct kset *k)
*/
struct kobject *kset_find_obj(struct kset *kset, const char *name)
{
- return kset_find_obj_hinted(kset, name, NULL);
-}
-
-/**
- * kset_find_obj_hinted - search for object in kset given a predecessor hint.
- * @kset: kset we're looking in.
- * @name: object's name.
- * @hint: hint to possible object's predecessor.
- *
- * Check the hint's next object and if it is a match return it directly,
- * otherwise, fall back to the behavior of kset_find_obj(). Either way
- * a reference for the returned object is held and the reference on the
- * hinted object is released.
- */
-struct kobject *kset_find_obj_hinted(struct kset *kset, const char *name,
- struct kobject *hint)
-{
struct kobject *k;
struct kobject *ret = NULL;
spin_lock(&kset->list_lock);
- if (!hint)
- goto slow_search;
-
- /* end of list detection */
- if (hint->entry.next == kset->list.next)
- goto slow_search;
-
- k = container_of(hint->entry.next, struct kobject, entry);
- if (!kobject_name(k) || strcmp(kobject_name(k), name))
- goto slow_search;
-
- ret = kobject_get(k);
- goto unlock_exit;
-
-slow_search:
list_for_each_entry(k, &kset->list, entry) {
if (kobject_name(k) && !strcmp(kobject_name(k), name)) {
ret = kobject_get(k);
@@ -790,12 +758,7 @@ slow_search:
}
}
-unlock_exit:
spin_unlock(&kset->list_lock);
-
- if (hint)
- kobject_put(hint);
-
return ret;
}
diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c
index ad72a03ce5e..e66e9b63261 100644
--- a/lib/kobject_uevent.c
+++ b/lib/kobject_uevent.c
@@ -259,6 +259,9 @@ int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
struct sk_buff *skb;
size_t len;
+ if (!netlink_has_listeners(uevent_sock, 1))
+ continue;
+
/* allocate message with the maximum possible size */
len = strlen(action_string) + strlen(devpath) + 2;
skb = alloc_skb(len + env->buflen, GFP_KERNEL);
diff --git a/lib/kref.c b/lib/kref.c
deleted file mode 100644
index 3efb882b11d..00000000000
--- a/lib/kref.c
+++ /dev/null
@@ -1,97 +0,0 @@
-/*
- * kref.c - library routines for handling generic reference counted objects
- *
- * Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
- * Copyright (C) 2004 IBM Corp.
- *
- * based on lib/kobject.c which was:
- * Copyright (C) 2002-2003 Patrick Mochel <mochel@osdl.org>
- *
- * This file is released under the GPLv2.
- *
- */
-
-#include <linux/kref.h>
-#include <linux/module.h>
-#include <linux/slab.h>
-
-/**
- * kref_init - initialize object.
- * @kref: object in question.
- */
-void kref_init(struct kref *kref)
-{
- atomic_set(&kref->refcount, 1);
- smp_mb();
-}
-
-/**
- * kref_get - increment refcount for object.
- * @kref: object.
- */
-void kref_get(struct kref *kref)
-{
- WARN_ON(!atomic_read(&kref->refcount));
- atomic_inc(&kref->refcount);
- smp_mb__after_atomic_inc();
-}
-
-/**
- * kref_put - decrement refcount for object.
- * @kref: object.
- * @release: pointer to the function that will clean up the object when the
- * last reference to the object is released.
- * This pointer is required, and it is not acceptable to pass kfree
- * in as this function.
- *
- * Decrement the refcount, and if 0, call release().
- * Return 1 if the object was removed, otherwise return 0. Beware, if this
- * function returns 0, you still can not count on the kref from remaining in
- * memory. Only use the return value if you want to see if the kref is now
- * gone, not present.
- */
-int kref_put(struct kref *kref, void (*release)(struct kref *kref))
-{
- WARN_ON(release == NULL);
- WARN_ON(release == (void (*)(struct kref *))kfree);
-
- if (atomic_dec_and_test(&kref->refcount)) {
- release(kref);
- return 1;
- }
- return 0;
-}
-
-
-/**
- * kref_sub - subtract a number of refcounts for object.
- * @kref: object.
- * @count: Number of recounts to subtract.
- * @release: pointer to the function that will clean up the object when the
- * last reference to the object is released.
- * This pointer is required, and it is not acceptable to pass kfree
- * in as this function.
- *
- * Subtract @count from the refcount, and if 0, call release().
- * Return 1 if the object was removed, otherwise return 0. Beware, if this
- * function returns 0, you still can not count on the kref from remaining in
- * memory. Only use the return value if you want to see if the kref is now
- * gone, not present.
- */
-int kref_sub(struct kref *kref, unsigned int count,
- void (*release)(struct kref *kref))
-{
- WARN_ON(release == NULL);
- WARN_ON(release == (void (*)(struct kref *))kfree);
-
- if (atomic_sub_and_test((int) count, &kref->refcount)) {
- release(kref);
- return 1;
- }
- return 0;
-}
-
-EXPORT_SYMBOL(kref_init);
-EXPORT_SYMBOL(kref_get);
-EXPORT_SYMBOL(kref_put);
-EXPORT_SYMBOL(kref_sub);
diff --git a/lib/reciprocal_div.c b/lib/reciprocal_div.c
index 6a3bd48fa2a..75510e94f7d 100644
--- a/lib/reciprocal_div.c
+++ b/lib/reciprocal_div.c
@@ -1,5 +1,6 @@
#include <asm/div64.h>
#include <linux/reciprocal_div.h>
+#include <linux/export.h>
u32 reciprocal_value(u32 k)
{
@@ -7,3 +8,4 @@ u32 reciprocal_value(u32 k)
do_div(val, k);
return (u32)val;
}
+EXPORT_SYMBOL(reciprocal_value);
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 993599e66e5..8e75003d62f 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -777,6 +777,18 @@ char *uuid_string(char *buf, char *end, const u8 *addr,
return string(buf, end, uuid, spec);
}
+static
+char *netdev_feature_string(char *buf, char *end, const u8 *addr,
+ struct printf_spec spec)
+{
+ spec.flags |= SPECIAL | SMALL | ZEROPAD;
+ if (spec.field_width == -1)
+ spec.field_width = 2 + 2 * sizeof(netdev_features_t);
+ spec.base = 16;
+
+ return number(buf, end, *(const netdev_features_t *)addr, spec);
+}
+
int kptr_restrict __read_mostly;
/*
@@ -824,6 +836,7 @@ int kptr_restrict __read_mostly;
* Do not use this feature without some mechanism to verify the
* 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
*
* Note: The difference between 'S' and 'F' is that on ia64 and ppc64
* function pointers are really function descriptors, which contain a
@@ -896,6 +909,12 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
has_capability_noaudit(current, CAP_SYSLOG))))
ptr = NULL;
break;
+ case 'N':
+ switch (fmt[1]) {
+ case 'F':
+ return netdev_feature_string(buf, end, ptr, spec);
+ }
+ break;
}
spec.flags |= SMALL;
if (spec.field_width == -1) {