From: Theodore Ts'o <ty...@mit.edu> ------------------- This is a commit scheduled for the next v2.6.34 longterm release. http://git.kernel.org/?p=linux/kernel/git/paulg/longterm-queue-2.6.34.git If you see a problem with using this for longterm, please comment. -------------------
commit c5857ccf293968348e5eb4ebedc68074de3dcda6 upstream. With the new interrupt sampling system, we are no longer using the timer_rand_state structure in the irq descriptor, so we can stop initializing it now. [ Merged in fixes from Sedat to find some last missing references to rand_initialize_irq() ] Signed-off-by: "Theodore Ts'o" <ty...@mit.edu> Signed-off-by: Sedat Dilek <sedat.di...@gmail.com> [PG: in .34 the irqdesc.h content is in irq.h instead.] Signed-off-by: Paul Gortmaker <paul.gortma...@windriver.com> --- arch/ia64/kernel/irq_ia64.c | 1 - drivers/char/random.c | 55 --------------------------------------------- drivers/mfd/ab3100-core.c | 3 --- include/linux/irq.h | 1 - include/linux/random.h | 2 -- kernel/irq/manage.c | 17 -------------- 6 files changed, 79 deletions(-) diff --git a/arch/ia64/kernel/irq_ia64.c b/arch/ia64/kernel/irq_ia64.c index 6404793..73a3f5b 100644 --- a/arch/ia64/kernel/irq_ia64.c +++ b/arch/ia64/kernel/irq_ia64.c @@ -23,7 +23,6 @@ #include <linux/ioport.h> #include <linux/kernel_stat.h> #include <linux/ptrace.h> -#include <linux/random.h> /* for rand_initialize_irq() */ #include <linux/signal.h> #include <linux/smp.h> #include <linux/threads.h> diff --git a/drivers/char/random.c b/drivers/char/random.c index 14f1f23..1644b8e 100644 --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -629,43 +629,6 @@ struct timer_rand_state { unsigned dont_count_entropy:1; }; -#ifndef CONFIG_GENERIC_HARDIRQS - -static struct timer_rand_state *irq_timer_state[NR_IRQS]; - -static struct timer_rand_state *get_timer_rand_state(unsigned int irq) -{ - return irq_timer_state[irq]; -} - -static void set_timer_rand_state(unsigned int irq, - struct timer_rand_state *state) -{ - irq_timer_state[irq] = state; -} - -#else - -static struct timer_rand_state *get_timer_rand_state(unsigned int irq) -{ - struct irq_desc *desc; - - desc = irq_to_desc(irq); - - return desc->timer_rand_state; -} - -static void set_timer_rand_state(unsigned int irq, - struct timer_rand_state *state) -{ - struct irq_desc *desc; - - desc = irq_to_desc(irq); - - desc->timer_rand_state = state; -} -#endif - /* * Add device- or boot-specific data to the input and nonblocking * pools to help initialize them to unique values. @@ -1134,24 +1097,6 @@ static int rand_initialize(void) } module_init(rand_initialize); -void rand_initialize_irq(int irq) -{ - struct timer_rand_state *state; - - state = get_timer_rand_state(irq); - - if (state) - return; - - /* - * If kzalloc returns null, we just won't use that entropy - * source. - */ - state = kzalloc(sizeof(struct timer_rand_state), GFP_KERNEL); - if (state) - set_timer_rand_state(irq, state); -} - #ifdef CONFIG_BLOCK void rand_initialize_disk(struct gendisk *disk) { diff --git a/drivers/mfd/ab3100-core.c b/drivers/mfd/ab3100-core.c index 2a193dc..5b7f5a90 100644 --- a/drivers/mfd/ab3100-core.c +++ b/drivers/mfd/ab3100-core.c @@ -890,9 +890,6 @@ static int __init ab3100_probe(struct i2c_client *client, err = request_threaded_irq(client->irq, NULL, ab3100_irq_handler, IRQF_ONESHOT, "ab3100-core", ab3100); - /* This real unpredictable IRQ is of course sampled for entropy */ - rand_initialize_irq(client->irq); - if (err) goto exit_no_irq; diff --git a/include/linux/irq.h b/include/linux/irq.h index 707ab12..7c2e4bf 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -174,7 +174,6 @@ struct irq_2_iommu; */ struct irq_desc { unsigned int irq; - struct timer_rand_state *timer_rand_state; unsigned int *kstat_irqs; #ifdef CONFIG_INTR_REMAP struct irq_2_iommu *irq_2_iommu; diff --git a/include/linux/random.h b/include/linux/random.h index 5a376bc..1864957 100644 --- a/include/linux/random.h +++ b/include/linux/random.h @@ -44,8 +44,6 @@ struct rand_pool_info { #ifdef __KERNEL__ -extern void rand_initialize_irq(int irq); - extern void add_device_randomness(const void *, unsigned int); extern void add_input_randomness(unsigned int type, unsigned int code, unsigned int value); diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 46f10b1..9080985 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -652,22 +652,6 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new) if (desc->chip == &no_irq_chip) return -ENOSYS; - /* - * Some drivers like serial.c use request_irq() heavily, - * so we have to be careful not to interfere with a - * running system. - */ - if (new->flags & IRQF_SAMPLE_RANDOM) { - /* - * This function might sleep, we want to call it first, - * outside of the atomic block. - * Yes, this might clear the entropy pool if the wrong - * driver is attempted to be loaded, without actually - * installing a new handler, but is this really a problem, - * only the sysadmin is able to do this. - */ - rand_initialize_irq(irq); - } /* Oneshot interrupts are not allowed with shared */ if ((new->flags & IRQF_ONESHOT) && (new->flags & IRQF_SHARED)) @@ -1040,7 +1024,6 @@ EXPORT_SYMBOL(free_irq); * * IRQF_SHARED Interrupt is shared * IRQF_DISABLED Disable local interrupts while processing - * IRQF_SAMPLE_RANDOM The interrupt can be used for entropy * IRQF_TRIGGER_* Specify active edge(s) or level * */ -- 1.7.12.rc2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/