Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756853Ab3JKHXk (ORCPT ); Fri, 11 Oct 2013 03:23:40 -0400 Received: from mail-ie0-f178.google.com ([209.85.223.178]:43251 "EHLO mail-ie0-f178.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752444Ab3JKHXj (ORCPT ); Fri, 11 Oct 2013 03:23:39 -0400 Message-Id: <20131011072323.730752659@kernel.org> User-Agent: quilt/0.60-1 Date: Fri, 11 Oct 2013 15:18:04 +0800 From: Shaohua Li To: linux-kernel@vger.kernel.org, axboe@kernel.dk Cc: kmo@daterainc.com Subject: [patch 2/4] percpu_ida: add percpu_ida_for_each_free References: <20131011071802.148101321@kernel.org> Content-Disposition: inline; filename=0002-percpu_ida-add-percpu_ida_for_each_free.patch Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2421 Lines: 78 Add a new API to iterate free ids. blk-mq-tag will use it. Signed-off-by: Shaohua Li --- include/linux/percpu_ida.h | 3 +++ lib/percpu_ida.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 47 insertions(+) Index: master/include/linux/percpu_ida.h =================================================================== --- master.orig/include/linux/percpu_ida.h 2013-10-11 12:14:56.932543376 +0800 +++ master/include/linux/percpu_ida.h 2013-10-11 12:14:56.928543501 +0800 @@ -73,4 +73,7 @@ static inline int percpu_ida_init(struct IDA_DEFAULT_PCPU_BATCH_MOVE); } +int percpu_ida_for_each_free(struct percpu_ida *pool, + int (*fn)(int id, void *data), void *data); + #endif /* __PERCPU_IDA_H__ */ Index: master/lib/percpu_ida.c =================================================================== --- master.orig/lib/percpu_ida.c 2013-10-11 12:14:56.932543376 +0800 +++ master/lib/percpu_ida.c 2013-10-11 12:14:56.928543501 +0800 @@ -327,3 +327,47 @@ err: return -ENOMEM; } EXPORT_SYMBOL_GPL(__percpu_ida_init); + +/** + * percpu_ida_for_each_free - iterate free ids of a pool + * @pool: pool to iterate + * @fn: interate callback function + * @data: parameter for @fn + * + * Note, this doesn't guarantee iterate all free ids restrictly. Some free + * ids might be missed, some might be iterated duplicated, and some might + * not be free and iterated. + */ +int percpu_ida_for_each_free(struct percpu_ida *pool, + int (*fn)(int id, void *data), void *data) +{ + unsigned long flags; + struct percpu_ida_cpu *remote; + unsigned cpu, i, err = 0; + + local_irq_save(flags); + for_each_possible_cpu(cpu) { + remote = per_cpu_ptr(pool->tag_cpu, cpu); + spin_lock(&remote->lock); + for (i = 0; i < remote->nr_free; i++) { + err = fn(remote->freelist[i], data); + if (err) + break; + } + spin_unlock(&remote->lock); + if (err) + goto out; + } + + spin_lock(&pool->lock); + for (i = 0; i < pool->nr_free; i++) { + err = fn(pool->freelist[i], data); + if (err) + break; + } + spin_unlock(&pool->lock); +out: + local_irq_restore(flags); + return err; +} +EXPORT_SYMBOL_GPL(percpu_ida_for_each_free); -- 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/