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Date: Thu, 30 Sep 2010 22:47:58 -0700
From: Yinghai Lu <yinghai@...nel.org>
To: Thomas Gleixner <tglx@...utronix.de>
CC: LKML <linux-kernel@...r.kernel.org>, linux-arch@...r.kernel.org,
Linus Torvalds <torvalds@...l.org>,
Andrew Morton <akpm@...ux-foundation.org>, x86@...nel.org,
Peter Zijlstra <peterz@...radead.org>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mundt <lethal@...ux-sh.org>,
Russell King <linux@....linux.org.uk>,
David Woodhouse <dwmw2@...radead.org>,
Jesse Barnes <jbarnes@...tuousgeek.org>,
Grant Likely <grant.likely@...retlab.ca>,
"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [patch 40/47] genirq: Sanitize dynamic irq handling
On 09/30/2010 04:17 PM, Thomas Gleixner wrote:
> Use the cleanup functions of the dynamic allocator. No need to have
> separate implementations.
>
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> ---
> include/linux/irq.h | 12 +++--
> kernel/irq/chip.c | 104 -------------------------------------------------
> kernel/irq/internals.h | 1
> kernel/irq/irqdesc.c | 37 +++++++++++------
> 4 files changed, 33 insertions(+), 121 deletions(-)
>
> Index: linux-2.6-tip/include/linux/irq.h
> ===================================================================
> --- linux-2.6-tip.orig/include/linux/irq.h
> +++ linux-2.6-tip/include/linux/irq.h
> @@ -497,11 +497,15 @@ static inline int irq_has_action(unsigne
> return desc->action != NULL;
> }
>
> -/* Dynamic irq helper functions */
> -extern void dynamic_irq_init(unsigned int irq);
> -void dynamic_irq_init_keep_chip_data(unsigned int irq);
> +/*
> + * Dynamic irq helper functions. Obsolete. Use irq_alloc_desc* and
> + * irq_free_desc instead.
> + */
> extern void dynamic_irq_cleanup(unsigned int irq);
> -void dynamic_irq_cleanup_keep_chip_data(unsigned int irq);
> +static inline void dynamic_irq_init(unsigned int irq)
> +{
> + dynamic_irq_cleanup(irq);
> +}
>
> /* Set/get chip/data for an IRQ: */
> extern int set_irq_chip(unsigned int irq, struct irq_chip *chip);
> Index: linux-2.6-tip/kernel/irq/chip.c
> ===================================================================
> --- linux-2.6-tip.orig/kernel/irq/chip.c
> +++ linux-2.6-tip/kernel/irq/chip.c
> @@ -18,110 +18,6 @@
>
> #include "internals.h"
>
> -static void dynamic_irq_init_x(unsigned int irq, bool keep_chip_data)
> -{
> - struct irq_desc *desc;
> - unsigned long flags;
> -
> - desc = irq_to_desc(irq);
> - if (!desc) {
> - WARN(1, KERN_ERR "Trying to initialize invalid IRQ%d\n", irq);
> - return;
> - }
> -
> - /* Ensure we don't have left over values from a previous use of this irq */
> - raw_spin_lock_irqsave(&desc->lock, flags);
> - desc->status = IRQ_DEFAULT_INIT_FLAGS;
> - desc->chip = &no_irq_chip;
> - desc->irq_data.chip = &no_irq_chip;
> - desc->handle_irq = handle_bad_irq;
> - desc->depth = 1;
> - desc->irq_data.msi_desc = NULL;
> - desc->irq_data.handler_data = NULL;
> - if (!keep_chip_data)
> - desc->irq_data.chip_data = NULL;
> - desc->action = NULL;
> - desc->irq_count = 0;
> - desc->irqs_unhandled = 0;
> -#ifdef CONFIG_SMP
> - cpumask_setall(desc->affinity);
> -#ifdef CONFIG_GENERIC_PENDING_IRQ
> - cpumask_clear(desc->pending_mask);
> -#endif
> -#endif
> - raw_spin_unlock_irqrestore(&desc->lock, flags);
> -}
> -
> -/**
> - * dynamic_irq_init - initialize a dynamically allocated irq
> - * @irq: irq number to initialize
> - */
> -void dynamic_irq_init(unsigned int irq)
> -{
> - dynamic_irq_init_x(irq, false);
> -}
> -
> -/**
> - * dynamic_irq_init_keep_chip_data - initialize a dynamically allocated irq
> - * @irq: irq number to initialize
> - *
> - * does not set irq_to_desc(irq)->chip_data to NULL
> - */
> -void dynamic_irq_init_keep_chip_data(unsigned int irq)
> -{
> - dynamic_irq_init_x(irq, true);
> -}
> -
> -static void dynamic_irq_cleanup_x(unsigned int irq, bool keep_chip_data)
> -{
> - struct irq_desc *desc = irq_to_desc(irq);
> - unsigned long flags;
> -
> - if (!desc) {
> - WARN(1, KERN_ERR "Trying to cleanup invalid IRQ%d\n", irq);
> - return;
> - }
> -
> - raw_spin_lock_irqsave(&desc->lock, flags);
> - if (desc->action) {
> - raw_spin_unlock_irqrestore(&desc->lock, flags);
> - WARN(1, KERN_ERR "Destroying IRQ%d without calling free_irq\n",
> - irq);
> - return;
> - }
> - desc->irq_data.msi_desc = NULL;
> - desc->irq_data.handler_data = NULL;
> - if (!keep_chip_data)
> - desc->irq_data.chip_data = NULL;
> - desc->handle_irq = handle_bad_irq;
> - desc->chip = &no_irq_chip;
> - desc->irq_data.chip = &no_irq_chip;
> - desc->name = NULL;
> - clear_kstat_irqs(desc);
> - raw_spin_unlock_irqrestore(&desc->lock, flags);
> -}
> -
> -/**
> - * dynamic_irq_cleanup - cleanup a dynamically allocated irq
> - * @irq: irq number to initialize
> - */
> -void dynamic_irq_cleanup(unsigned int irq)
> -{
> - dynamic_irq_cleanup_x(irq, false);
> -}
> -
> -/**
> - * dynamic_irq_cleanup_keep_chip_data - cleanup a dynamically allocated irq
> - * @irq: irq number to initialize
> - *
> - * does not set irq_to_desc(irq)->chip_data to NULL
> - */
> -void dynamic_irq_cleanup_keep_chip_data(unsigned int irq)
> -{
> - dynamic_irq_cleanup_x(irq, true);
> -}
> -
> -
> /**
> * set_irq_chip - set the irq chip for an irq
> * @irq: irq number
> Index: linux-2.6-tip/kernel/irq/internals.h
> ===================================================================
> --- linux-2.6-tip.orig/kernel/irq/internals.h
> +++ linux-2.6-tip/kernel/irq/internals.h
> @@ -17,7 +17,6 @@ extern void __enable_irq(struct irq_desc
>
> extern struct lock_class_key irq_desc_lock_class;
> extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr);
> -extern void clear_kstat_irqs(struct irq_desc *desc);
> extern raw_spinlock_t sparse_irq_lock;
>
> #ifdef CONFIG_SPARSE_IRQ
> Index: linux-2.6-tip/kernel/irq/irqdesc.c
> ===================================================================
> --- linux-2.6-tip.orig/kernel/irq/irqdesc.c
> +++ linux-2.6-tip/kernel/irq/irqdesc.c
> @@ -54,10 +54,13 @@ static void desc_smp_init(struct irq_des
> desc->node = node;
> desc->irq_data.affinity = &desc->affinity;
> cpumask_copy(desc->affinity, irq_default_affinity);
> +#ifdef CONFIG_GENERIC_PENDING_IRQ
> + cpumask_clear(desc->pending_mask);
> +#endif
> }
> -
> +static inline int desc_node(struct irq_desc *desc) { return desc->node; }
> #else
> -static inline int
> +static inline int desc_node(struct irq_desc *desc) { return 0; }
> alloc_masks(struct irq_desc *desc, gfp_t gfp, int node) { return 0; }
> static inline void desc_smp_init(struct irq_desc *desc, int node) { }
> #endif
> @@ -72,6 +75,8 @@ static void desc_set_defaults(unsigned i
> desc->irq_data.chip = &no_irq_chip;
> desc->handle_irq = handle_bad_irq;
> desc->depth = 1;
> + desc->irq_count = 0;
> + desc->irqs_unhandled = 0;
> desc->name = NULL;
> memset(desc->kstat_irqs, 0, nr_cpu_ids * sizeof(*(desc->kstat_irqs)));
> desc_smp_init(desc, node);
> @@ -136,6 +141,7 @@ static void free_masks(struct irq_desc *
> #endif
> free_cpumask_var(desc->affinity);
> }
> +static int node
?
> #else
> static inline void free_masks(struct irq_desc *desc) { }
> #endif
> @@ -290,16 +296,7 @@ struct irq_desc *irq_to_desc_alloc_node(
>
> static void free_desc(unsigned int irq)
> {
> - struct irq_desc *desc = irq_to_desc(irq);
> - unsigned long flags;
> -
> - raw_spin_lock_irqsave(&desc->lock, flags);
> -#ifdef CONFIG_SMP
> - desc_set_defaults(irq, desc, desc->node);
> -#else
> - desc_set_defaults(irq, desc, 0);
> -#endif
> - raw_spin_unlock_irqrestore(&desc->lock, flags);
> + dynamic_irq_cleanup(irq);
> }
>
> static inline int alloc_descs(unsigned int start, unsigned int cnt, int node)
> @@ -386,6 +383,22 @@ unsigned int irq_get_next_irq(unsigned i
> return res;
> }
>
> +/**
> + * dynamic_irq_cleanup - cleanup a dynamically allocated irq
> + * @irq: irq number to initialize
> + */
> +void dynamic_irq_cleanup(unsigned int irq)
> +{
> + struct irq_desc *desc = irq_to_desc(irq);
> + unsigned long flags;
> +
> + raw_spin_lock_irqsave(&desc->lock, flags);
> + desc_set_defaults(irq, desc, desc_node(desc));
> + raw_spin_unlock_irqrestore(&desc->lock, flags);
> +}
> +
> + unsigned int kstat_irqs_cpu(unsigned int irq, int cpu)
> +
> /* Statistics access */
> void clear_kstat_irqs(struct irq_desc *desc)
> {
>
--
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