Dear RT Folks, I'm pleased to announce the 3.18.48-rt54 stable release. You can get this release via the git tree at: git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-stable-rt.git branch: v3.18-rt Head SHA1: 7da5438755e5c4ac20b7b6a3e689f5c6ecc18c49 Or to build 3.18.48-rt54 directly, the following patches should be applied: http://www.kernel.org/pub/linux/kernel/v3.x/linux-3.18.tar.xz http://www.kernel.org/pub/linux/kernel/v3.x/patch-3.18.48.xz http://www.kernel.org/pub/linux/kernel/projects/rt/3.18/patch-3.18.48-rt54.patch.xz You can also build from 3.18.48-rt53 by applying the incremental patch: http://www.kernel.org/pub/linux/kernel/projects/rt/3.18/incr/patch-3.18.48-rt53-rt54.patch.xz Enjoy, -- Steve Changes from v3.18.48-rt53: --- Dan Murphy (1): lockdep: Fix compilation error for !CONFIG_MODULES and !CONFIG_SMP John Ogness (1): x86/mm/cpa: avoid wbinvd() for PREEMPT Julia Cartwright (1): pinctrl: qcom: Use raw spinlock variants Sebastian Andrzej Siewior (3): radix-tree: use local locks rt: Drop mutex_disable() on !DEBUG configs and the GPL suffix from export symbol rt: Drop the removal of _GPL from rt_mutex_destroy()'s EXPORT_SYMBOL Steven Rostedt (VMware) (1): Linux 3.18.48-rt54 Thomas Gleixner (1): lockdep: Handle statically initialized PER_CPU locks proper ---- arch/x86/mm/pageattr.c | 8 +++++++ drivers/pinctrl/qcom/pinctrl-msm.c | 48 +++++++++++++++++++------------------- include/linux/module.h | 6 +++++ include/linux/mutex_rt.h | 5 ++++ include/linux/percpu.h | 1 + include/linux/radix-tree.h | 12 ++-------- kernel/locking/lockdep.c | 32 ++++++++++++++++++------- kernel/module.c | 36 ++++++++++++++++++---------- lib/radix-tree.c | 23 +++++++++++------- localversion-rt | 2 +- mm/percpu.c | 37 ++++++++++++++++++----------- 11 files changed, 131 insertions(+), 79 deletions(-) --------------------------- diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c index e5545f2105f6..3c4b0318a363 100644 --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -211,7 +211,15 @@ static void cpa_flush_array(unsigned long *start, int numpages, int cache, int in_flags, struct page **pages) { unsigned int i, level; +#ifdef CONFIG_PREEMPT + /* + * Avoid wbinvd() because it causes latencies on all CPUs, + * regardless of any CPU isolation that may be in effect. + */ + unsigned long do_wbinvd = 0; +#else unsigned long do_wbinvd = cache && numpages >= 1024; /* 4M threshold */ +#endif BUG_ON(irqs_disabled()); diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c index ed7017df065d..94f1a4fd7681 100644 --- a/drivers/pinctrl/qcom/pinctrl-msm.c +++ b/drivers/pinctrl/qcom/pinctrl-msm.c @@ -59,7 +59,7 @@ struct msm_pinctrl { struct notifier_block restart_nb; int irq; - spinlock_t lock; + raw_spinlock_t lock; DECLARE_BITMAP(dual_edge_irqs, MAX_NR_GPIO); DECLARE_BITMAP(enabled_irqs, MAX_NR_GPIO); @@ -155,14 +155,14 @@ static int msm_pinmux_set_mux(struct pinctrl_dev *pctldev, if (WARN_ON(i == g->nfuncs)) return -EINVAL; - spin_lock_irqsave(&pctrl->lock, flags); + raw_spin_lock_irqsave(&pctrl->lock, flags); val = readl(pctrl->regs + g->ctl_reg); val &= ~(0x7 << g->mux_bit); val |= i << g->mux_bit; writel(val, pctrl->regs + g->ctl_reg); - spin_unlock_irqrestore(&pctrl->lock, flags); + raw_spin_unlock_irqrestore(&pctrl->lock, flags); return 0; } @@ -336,14 +336,14 @@ static int msm_config_group_set(struct pinctrl_dev *pctldev, break; case PIN_CONFIG_OUTPUT: /* set output value */ - spin_lock_irqsave(&pctrl->lock, flags); + raw_spin_lock_irqsave(&pctrl->lock, flags); val = readl(pctrl->regs + g->io_reg); if (arg) val |= BIT(g->out_bit); else val &= ~BIT(g->out_bit); writel(val, pctrl->regs + g->io_reg); - spin_unlock_irqrestore(&pctrl->lock, flags); + raw_spin_unlock_irqrestore(&pctrl->lock, flags); /* enable output */ arg = 1; @@ -360,12 +360,12 @@ static int msm_config_group_set(struct pinctrl_dev *pctldev, return -EINVAL; } - spin_lock_irqsave(&pctrl->lock, flags); + raw_spin_lock_irqsave(&pctrl->lock, flags); val = readl(pctrl->regs + g->ctl_reg); val &= ~(mask << bit); val |= arg << bit; writel(val, pctrl->regs + g->ctl_reg); - spin_unlock_irqrestore(&pctrl->lock, flags); + raw_spin_unlock_irqrestore(&pctrl->lock, flags); } return 0; @@ -394,13 +394,13 @@ static int msm_gpio_direction_input(struct gpio_chip *chip, unsigned offset) g = &pctrl->soc->groups[offset]; - spin_lock_irqsave(&pctrl->lock, flags); + raw_spin_lock_irqsave(&pctrl->lock, flags); val = readl(pctrl->regs + g->ctl_reg); val &= ~BIT(g->oe_bit); writel(val, pctrl->regs + g->ctl_reg); - spin_unlock_irqrestore(&pctrl->lock, flags); + raw_spin_unlock_irqrestore(&pctrl->lock, flags); return 0; } @@ -414,7 +414,7 @@ static int msm_gpio_direction_output(struct gpio_chip *chip, unsigned offset, in g = &pctrl->soc->groups[offset]; - spin_lock_irqsave(&pctrl->lock, flags); + raw_spin_lock_irqsave(&pctrl->lock, flags); val = readl(pctrl->regs + g->io_reg); if (value) @@ -427,7 +427,7 @@ static int msm_gpio_direction_output(struct gpio_chip *chip, unsigned offset, in val |= BIT(g->oe_bit); writel(val, pctrl->regs + g->ctl_reg); - spin_unlock_irqrestore(&pctrl->lock, flags); + raw_spin_unlock_irqrestore(&pctrl->lock, flags); return 0; } @@ -453,7 +453,7 @@ static void msm_gpio_set(struct gpio_chip *chip, unsigned offset, int value) g = &pctrl->soc->groups[offset]; - spin_lock_irqsave(&pctrl->lock, flags); + raw_spin_lock_irqsave(&pctrl->lock, flags); val = readl(pctrl->regs + g->io_reg); if (value) @@ -462,7 +462,7 @@ static void msm_gpio_set(struct gpio_chip *chip, unsigned offset, int value) val &= ~BIT(g->out_bit); writel(val, pctrl->regs + g->io_reg); - spin_unlock_irqrestore(&pctrl->lock, flags); + raw_spin_unlock_irqrestore(&pctrl->lock, flags); } static int msm_gpio_request(struct gpio_chip *chip, unsigned offset) @@ -593,7 +593,7 @@ static void msm_gpio_irq_mask(struct irq_data *d) g = &pctrl->soc->groups[d->hwirq]; - spin_lock_irqsave(&pctrl->lock, flags); + raw_spin_lock_irqsave(&pctrl->lock, flags); val = readl(pctrl->regs + g->intr_cfg_reg); val &= ~BIT(g->intr_enable_bit); @@ -601,7 +601,7 @@ static void msm_gpio_irq_mask(struct irq_data *d) clear_bit(d->hwirq, pctrl->enabled_irqs); - spin_unlock_irqrestore(&pctrl->lock, flags); + raw_spin_unlock_irqrestore(&pctrl->lock, flags); } static void msm_gpio_irq_unmask(struct irq_data *d) @@ -614,7 +614,7 @@ static void msm_gpio_irq_unmask(struct irq_data *d) g = &pctrl->soc->groups[d->hwirq]; - spin_lock_irqsave(&pctrl->lock, flags); + raw_spin_lock_irqsave(&pctrl->lock, flags); val = readl(pctrl->regs + g->intr_status_reg); val &= ~BIT(g->intr_status_bit); @@ -626,7 +626,7 @@ static void msm_gpio_irq_unmask(struct irq_data *d) set_bit(d->hwirq, pctrl->enabled_irqs); - spin_unlock_irqrestore(&pctrl->lock, flags); + raw_spin_unlock_irqrestore(&pctrl->lock, flags); } static void msm_gpio_irq_ack(struct irq_data *d) @@ -639,7 +639,7 @@ static void msm_gpio_irq_ack(struct irq_data *d) g = &pctrl->soc->groups[d->hwirq]; - spin_lock_irqsave(&pctrl->lock, flags); + raw_spin_lock_irqsave(&pctrl->lock, flags); val = readl(pctrl->regs + g->intr_status_reg); if (g->intr_ack_high) @@ -651,7 +651,7 @@ static void msm_gpio_irq_ack(struct irq_data *d) if (test_bit(d->hwirq, pctrl->dual_edge_irqs)) msm_gpio_update_dual_edge_pos(pctrl, g, d); - spin_unlock_irqrestore(&pctrl->lock, flags); + raw_spin_unlock_irqrestore(&pctrl->lock, flags); } static int msm_gpio_irq_set_type(struct irq_data *d, unsigned int type) @@ -664,7 +664,7 @@ static int msm_gpio_irq_set_type(struct irq_data *d, unsigned int type) g = &pctrl->soc->groups[d->hwirq]; - spin_lock_irqsave(&pctrl->lock, flags); + raw_spin_lock_irqsave(&pctrl->lock, flags); /* * For hw without possibility of detecting both edges @@ -738,7 +738,7 @@ static int msm_gpio_irq_set_type(struct irq_data *d, unsigned int type) if (test_bit(d->hwirq, pctrl->dual_edge_irqs)) msm_gpio_update_dual_edge_pos(pctrl, g, d); - spin_unlock_irqrestore(&pctrl->lock, flags); + raw_spin_unlock_irqrestore(&pctrl->lock, flags); if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH)) __irq_set_handler_locked(d->irq, handle_level_irq); @@ -754,11 +754,11 @@ static int msm_gpio_irq_set_wake(struct irq_data *d, unsigned int on) struct msm_pinctrl *pctrl = to_msm_pinctrl(gc); unsigned long flags; - spin_lock_irqsave(&pctrl->lock, flags); + raw_spin_lock_irqsave(&pctrl->lock, flags); irq_set_irq_wake(pctrl->irq, on); - spin_unlock_irqrestore(&pctrl->lock, flags); + raw_spin_unlock_irqrestore(&pctrl->lock, flags); return 0; } @@ -895,7 +895,7 @@ int msm_pinctrl_probe(struct platform_device *pdev, pctrl->soc = soc_data; pctrl->chip = msm_gpio_template; - spin_lock_init(&pctrl->lock); + raw_spin_lock_init(&pctrl->lock); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); pctrl->regs = devm_ioremap_resource(&pdev->dev, res); diff --git a/include/linux/module.h b/include/linux/module.h index 6fc269ce701c..208518a81281 100644 --- a/include/linux/module.h +++ b/include/linux/module.h @@ -394,6 +394,7 @@ static inline int module_is_live(struct module *mod) struct module *__module_text_address(unsigned long addr); struct module *__module_address(unsigned long addr); bool is_module_address(unsigned long addr); +bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr); bool is_module_percpu_address(unsigned long addr); bool is_module_text_address(unsigned long addr); @@ -546,6 +547,11 @@ static inline bool is_module_percpu_address(unsigned long addr) return false; } +static inline bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr) +{ + return false; +} + static inline bool is_module_text_address(unsigned long addr) { return false; diff --git a/include/linux/mutex_rt.h b/include/linux/mutex_rt.h index c38a44b14da5..e0284edec655 100644 --- a/include/linux/mutex_rt.h +++ b/include/linux/mutex_rt.h @@ -43,7 +43,12 @@ extern void __lockfunc _mutex_unlock(struct mutex *lock); #define mutex_lock_killable(l) _mutex_lock_killable(l) #define mutex_trylock(l) _mutex_trylock(l) #define mutex_unlock(l) _mutex_unlock(l) + +#ifdef CONFIG_DEBUG_MUTEXES #define mutex_destroy(l) rt_mutex_destroy(&(l)->lock) +#else +static inline void mutex_destroy(struct mutex *lock) {} +#endif #ifdef CONFIG_DEBUG_LOCK_ALLOC # define mutex_lock_nested(l, s) _mutex_lock_nested(l, s) diff --git a/include/linux/percpu.h b/include/linux/percpu.h index 208d86d80cba..a3a446c2901b 100644 --- a/include/linux/percpu.h +++ b/include/linux/percpu.h @@ -144,6 +144,7 @@ extern int __init pcpu_page_first_chunk(size_t reserved_size, #endif extern void __percpu *__alloc_reserved_percpu(size_t size, size_t align); +extern bool __is_kernel_percpu_address(unsigned long addr, unsigned long *can_addr); extern bool is_kernel_percpu_address(unsigned long addr); #if !defined(CONFIG_SMP) || !defined(CONFIG_HAVE_SETUP_PER_CPU_AREA) diff --git a/include/linux/radix-tree.h b/include/linux/radix-tree.h index 9a80663a1574..e46b414e9e39 100644 --- a/include/linux/radix-tree.h +++ b/include/linux/radix-tree.h @@ -277,13 +277,10 @@ radix_tree_gang_lookup(struct radix_tree_root *root, void **results, unsigned int radix_tree_gang_lookup_slot(struct radix_tree_root *root, void ***results, unsigned long *indices, unsigned long first_index, unsigned int max_items); -#ifndef CONFIG_PREEMPT_RT_FULL int radix_tree_preload(gfp_t gfp_mask); int radix_tree_maybe_preload(gfp_t gfp_mask); -#else -static inline int radix_tree_preload(gfp_t gm) { return 0; } -static inline int radix_tree_maybe_preload(gfp_t gfp_mask) { return 0; } -#endif +void radix_tree_preload_end(void); + void radix_tree_init(void); void *radix_tree_tag_set(struct radix_tree_root *root, unsigned long index, unsigned int tag); @@ -306,11 +303,6 @@ unsigned long radix_tree_range_tag_if_tagged(struct radix_tree_root *root, int radix_tree_tagged(struct radix_tree_root *root, unsigned int tag); unsigned long radix_tree_locate_item(struct radix_tree_root *root, void *item); -static inline void radix_tree_preload_end(void) -{ - preempt_enable_nort(); -} - /** * struct radix_tree_iter - radix tree iterator state * diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index fce6f6f69aad..d4a4d8ea55d6 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -654,6 +654,7 @@ look_up_lock_class(struct lockdep_map *lock, unsigned int subclass) struct lockdep_subclass_key *key; struct list_head *hash_head; struct lock_class *class; + bool is_static = false; #ifdef CONFIG_DEBUG_LOCKDEP /* @@ -681,10 +682,23 @@ look_up_lock_class(struct lockdep_map *lock, unsigned int subclass) /* * Static locks do not have their class-keys yet - for them the key - * is the lock object itself: + * is the lock object itself. If the lock is in the per cpu area, + * the canonical address of the lock (per cpu offset removed) is + * used. */ - if (unlikely(!lock->key)) - lock->key = (void *)lock; + if (unlikely(!lock->key)) { + unsigned long can_addr, addr = (unsigned long)lock; + + if (__is_kernel_percpu_address(addr, &can_addr)) + lock->key = (void *)can_addr; + else if (__is_module_percpu_address(addr, &can_addr)) + lock->key = (void *)can_addr; + else if (static_obj(lock)) + lock->key = (void *)lock; + else + return ERR_PTR(-EINVAL); + is_static = true; + } /* * NOTE: the class-key must be unique. For dynamic locks, a static @@ -714,7 +728,7 @@ look_up_lock_class(struct lockdep_map *lock, unsigned int subclass) } } - return NULL; + return is_static || static_obj(lock->key) ? NULL : ERR_PTR(-EINVAL); } /* @@ -731,13 +745,13 @@ register_lock_class(struct lockdep_map *lock, unsigned int subclass, int force) unsigned long flags; class = look_up_lock_class(lock, subclass); - if (likely(class)) + if (likely(!IS_ERR_OR_NULL(class))) goto out_set_class_cache; /* * Debug-check: all keys must be persistent! - */ - if (!static_obj(lock->key)) { + */ + if (IS_ERR(class)) { debug_locks_off(); printk("INFO: trying to register non-static key.\n"); printk("the code is fine but needs lockdep annotation.\n"); @@ -3276,7 +3290,7 @@ static int match_held_lock(struct held_lock *hlock, struct lockdep_map *lock) * Clearly if the lock hasn't been acquired _ever_, we're not * holding it either, so report failure. */ - if (!class) + if (IS_ERR_OR_NULL(class)) return 0; /* @@ -3938,7 +3952,7 @@ void lockdep_reset_lock(struct lockdep_map *lock) * If the class exists we look it up and zap it: */ class = look_up_lock_class(lock, j); - if (class) + if (!IS_ERR_OR_NULL(class)) zap_class(class); } /* diff --git a/kernel/module.c b/kernel/module.c index 737d53099360..ab5169e72289 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -526,16 +526,7 @@ static void percpu_modcopy(struct module *mod, memcpy(per_cpu_ptr(mod->percpu, cpu), from, size); } -/** - * is_module_percpu_address - test whether address is from module static percpu - * @addr: address to test - * - * Test whether @addr belongs to module static percpu area. - * - * RETURNS: - * %true if @addr is from module static percpu area - */ -bool is_module_percpu_address(unsigned long addr) +bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr) { struct module *mod; unsigned int cpu; @@ -549,9 +540,11 @@ bool is_module_percpu_address(unsigned long addr) continue; for_each_possible_cpu(cpu) { void *start = per_cpu_ptr(mod->percpu, cpu); + void *va = (void *)addr; - if ((void *)addr >= start && - (void *)addr < start + mod->percpu_size) { + if (va >= start && va < start + mod->percpu_size) { + if (can_addr) + *can_addr = (unsigned long) (va - start); preempt_enable(); return true; } @@ -562,6 +555,20 @@ bool is_module_percpu_address(unsigned long addr) return false; } +/** + * is_module_percpu_address - test whether address is from module static percpu + * @addr: address to test + * + * Test whether @addr belongs to module static percpu area. + * + * RETURNS: + * %true if @addr is from module static percpu area + */ +bool is_module_percpu_address(unsigned long addr) +{ + return __is_module_percpu_address(addr, NULL); +} + #else /* ... !CONFIG_SMP */ static inline void __percpu *mod_percpu(struct module *mod) @@ -593,6 +600,11 @@ bool is_module_percpu_address(unsigned long addr) return false; } +bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr) +{ + return false; +} + #endif /* CONFIG_SMP */ #define MODINFO_ATTR(field) \ diff --git a/lib/radix-tree.c b/lib/radix-tree.c index 19713243e698..14192936ee69 100644 --- a/lib/radix-tree.c +++ b/lib/radix-tree.c @@ -34,7 +34,7 @@ #include <linux/bitops.h> #include <linux/rcupdate.h> #include <linux/preempt_mask.h> /* in_interrupt() */ - +#include <linux/locallock.h> /* * The height_to_maxindex array needs to be one deeper than the maximum @@ -68,6 +68,7 @@ struct radix_tree_preload { struct radix_tree_node *nodes[RADIX_TREE_PRELOAD_SIZE]; }; static DEFINE_PER_CPU(struct radix_tree_preload, radix_tree_preloads) = { 0, }; +static DEFINE_LOCAL_IRQ_LOCK(radix_tree_preloads_lock); static inline void *ptr_to_indirect(void *ptr) { @@ -195,13 +196,13 @@ radix_tree_node_alloc(struct radix_tree_root *root) * succeed in getting a node here (and never reach * kmem_cache_alloc) */ - rtp = &get_cpu_var(radix_tree_preloads); + rtp = &get_locked_var(radix_tree_preloads_lock, radix_tree_preloads); if (rtp->nr) { ret = rtp->nodes[rtp->nr - 1]; rtp->nodes[rtp->nr - 1] = NULL; rtp->nr--; } - put_cpu_var(radix_tree_preloads); + put_locked_var(radix_tree_preloads_lock, radix_tree_preloads); /* * Update the allocation stack trace as this is more useful * for debugging. @@ -241,7 +242,6 @@ radix_tree_node_free(struct radix_tree_node *node) call_rcu(&node->rcu_head, radix_tree_node_rcu_free); } -#ifndef CONFIG_PREEMPT_RT_FULL /* * Load up this CPU's radix_tree_node buffer with sufficient objects to * ensure that the addition of a single element in the tree cannot fail. On @@ -257,14 +257,14 @@ static int __radix_tree_preload(gfp_t gfp_mask) struct radix_tree_node *node; int ret = -ENOMEM; - preempt_disable(); + local_lock(radix_tree_preloads_lock); rtp = this_cpu_ptr(&radix_tree_preloads); while (rtp->nr < ARRAY_SIZE(rtp->nodes)) { - preempt_enable(); + local_unlock(radix_tree_preloads_lock); node = kmem_cache_alloc(radix_tree_node_cachep, gfp_mask); if (node == NULL) goto out; - preempt_disable(); + local_lock(radix_tree_preloads_lock); rtp = this_cpu_ptr(&radix_tree_preloads); if (rtp->nr < ARRAY_SIZE(rtp->nodes)) rtp->nodes[rtp->nr++] = node; @@ -303,11 +303,16 @@ int radix_tree_maybe_preload(gfp_t gfp_mask) if (gfp_mask & __GFP_WAIT) return __radix_tree_preload(gfp_mask); /* Preloading doesn't help anything with this gfp mask, skip it */ - preempt_disable(); + local_lock(radix_tree_preloads_lock); return 0; } EXPORT_SYMBOL(radix_tree_maybe_preload); -#endif + +void radix_tree_preload_end(void) +{ + local_unlock(radix_tree_preloads_lock); +} +EXPORT_SYMBOL(radix_tree_preload_end); /* * Return the maximum key which can be store into a diff --git a/localversion-rt b/localversion-rt index e6c0dc6a54cd..3165a8781ff5 100644 --- a/localversion-rt +++ b/localversion-rt @@ -1 +1 @@ --rt53 +-rt54 diff --git a/mm/percpu.c b/mm/percpu.c index 5ae6e0284967..d270e8077f52 100644 --- a/mm/percpu.c +++ b/mm/percpu.c @@ -1282,18 +1282,7 @@ void free_percpu(void __percpu *ptr) } EXPORT_SYMBOL_GPL(free_percpu); -/** - * is_kernel_percpu_address - test whether address is from static percpu area - * @addr: address to test - * - * Test whether @addr belongs to in-kernel static percpu area. Module - * static percpu areas are not considered. For those, use - * is_module_percpu_address(). - * - * RETURNS: - * %true if @addr is from in-kernel static percpu area, %false otherwise. - */ -bool is_kernel_percpu_address(unsigned long addr) +bool __is_kernel_percpu_address(unsigned long addr, unsigned long *can_addr) { #ifdef CONFIG_SMP const size_t static_size = __per_cpu_end - __per_cpu_start; @@ -1302,16 +1291,36 @@ bool is_kernel_percpu_address(unsigned long addr) for_each_possible_cpu(cpu) { void *start = per_cpu_ptr(base, cpu); + void *va = (void *)addr; - if ((void *)addr >= start && (void *)addr < start + static_size) + if (va >= start && va < start + static_size) { + if (can_addr) + *can_addr = (unsigned long) (va - start); return true; - } + } + } #endif /* on UP, can't distinguish from other static vars, always false */ return false; } /** + * is_kernel_percpu_address - test whether address is from static percpu area + * @addr: address to test + * + * Test whether @addr belongs to in-kernel static percpu area. Module + * static percpu areas are not considered. For those, use + * is_module_percpu_address(). + * + * RETURNS: + * %true if @addr is from in-kernel static percpu area, %false otherwise. + */ +bool is_kernel_percpu_address(unsigned long addr) +{ + return __is_kernel_percpu_address(addr, NULL); +} + +/** * per_cpu_ptr_to_phys - convert translated percpu address to physical address * @addr: the address to be converted to physical address * -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
