Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758866Ab0APDKz (ORCPT ); Fri, 15 Jan 2010 22:10:55 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758857Ab0APDKJ (ORCPT ); Fri, 15 Jan 2010 22:10:09 -0500 Received: from sca-es-mail-2.Sun.COM ([192.18.43.133]:33972 "EHLO sca-es-mail-2.sun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758856Ab0APDIY (ORCPT ); Fri, 15 Jan 2010 22:08:24 -0500 MIME-version: 1.0 Content-transfer-encoding: 7BIT Content-type: TEXT/PLAIN Date: Fri, 15 Jan 2010 19:07:01 -0800 From: Yinghai Lu Subject: [PATCH 30/37] sparseirq: use radix_tree instead of ptrs array In-reply-to: <1263611228-6751-1-git-send-email-yinghai@kernel.org> To: Ingo Molnar , Thomas Gleixner , "H. Peter Anvin" , Andrew Morton , Jesse Barnes , Christoph Lameter Cc: linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, Yinghai Lu Message-id: <1263611228-6751-31-git-send-email-yinghai@kernel.org> X-Mailer: git-send-email 1.6.4.2 References: <1263611228-6751-1-git-send-email-yinghai@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org use radix_tree irq_desc_tree instead of irq_desc_ptrs. -v2: according to Eric and cyrill to use radix_tree_lookup_slot and radix_tree_replace_slot Signed-off-by: Yinghai Lu --- kernel/irq/handle.c | 50 +++++++++++++++++++++++++------------------------- 1 files changed, 25 insertions(+), 25 deletions(-) diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c index c833c09..76d5a67 100644 --- a/kernel/irq/handle.c +++ b/kernel/irq/handle.c @@ -19,6 +19,7 @@ #include #include #include +#include #include #include "internals.h" @@ -127,7 +128,26 @@ static void init_one_irq_desc(int irq, struct irq_desc *desc, int node) */ DEFINE_RAW_SPINLOCK(sparse_irq_lock); -static struct irq_desc **irq_desc_ptrs __read_mostly; +static RADIX_TREE(irq_desc_tree, GFP_ATOMIC); + +static void set_irq_desc(unsigned int irq, struct irq_desc *desc) +{ + radix_tree_insert(&irq_desc_tree, irq, desc); +} + +struct irq_desc *irq_to_desc(unsigned int irq) +{ + return radix_tree_lookup(&irq_desc_tree, irq); +} + +void replace_irq_desc(unsigned int irq, struct irq_desc *desc) +{ + void **ptr; + + ptr = radix_tree_lookup_slot(&irq_desc_tree, irq); + if (ptr) + radix_tree_replace_slot(ptr, desc); +} static struct irq_desc irq_desc_legacy[NR_IRQS_LEGACY] __cacheline_aligned_in_smp = { [0 ... NR_IRQS_LEGACY-1] = { @@ -159,9 +179,6 @@ int __init early_irq_init(void) legacy_count = ARRAY_SIZE(irq_desc_legacy); node = first_online_node; - /* allocate irq_desc_ptrs array based on nr_irqs */ - irq_desc_ptrs = kcalloc(nr_irqs, sizeof(void *), GFP_NOWAIT); - /* allocate based on nr_cpu_ids */ kstat_irqs_legacy = kzalloc_node(NR_IRQS_LEGACY * nr_cpu_ids * sizeof(int), GFP_NOWAIT, node); @@ -175,29 +192,12 @@ int __init early_irq_init(void) lockdep_set_class(&desc[i].lock, &irq_desc_lock_class); alloc_desc_masks(&desc[i], node, true); init_desc_masks(&desc[i]); - irq_desc_ptrs[i] = desc + i; + set_irq_desc(i, &desc[i]); } - for (i = legacy_count; i < nr_irqs; i++) - irq_desc_ptrs[i] = NULL; - return arch_early_irq_init(); } -struct irq_desc *irq_to_desc(unsigned int irq) -{ - if (irq_desc_ptrs && irq < nr_irqs) - return irq_desc_ptrs[irq]; - - return NULL; -} - -void replace_irq_desc(unsigned int irq, struct irq_desc *desc) -{ - if (irq_desc_ptrs && irq < nr_irqs) - irq_desc_ptrs[irq] = desc; -} - struct irq_desc * __ref irq_to_desc_alloc_node(unsigned int irq, int node) { struct irq_desc *desc; @@ -209,14 +209,14 @@ struct irq_desc * __ref irq_to_desc_alloc_node(unsigned int irq, int node) return NULL; } - desc = irq_desc_ptrs[irq]; + desc = irq_to_desc(irq); if (desc) return desc; raw_spin_lock_irqsave(&sparse_irq_lock, flags); /* We have to check it to avoid races with another CPU */ - desc = irq_desc_ptrs[irq]; + desc = irq_to_desc(irq); if (desc) goto out_unlock; @@ -229,7 +229,7 @@ struct irq_desc * __ref irq_to_desc_alloc_node(unsigned int irq, int node) } init_one_irq_desc(irq, desc, node); - irq_desc_ptrs[irq] = desc; + set_irq_desc(irq, desc); out_unlock: raw_spin_unlock_irqrestore(&sparse_irq_lock, flags); -- 1.6.4.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/