diff options
author | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 12:17:53 -0700 |
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committer | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 15:44:42 -0700 |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/block/blk-mq-cpu.c | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/block/blk-mq-cpu.c')
-rw-r--r-- | kernel/block/blk-mq-cpu.c | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/kernel/block/blk-mq-cpu.c b/kernel/block/blk-mq-cpu.c new file mode 100644 index 000000000..628c6c13c --- /dev/null +++ b/kernel/block/blk-mq-cpu.c @@ -0,0 +1,70 @@ +/* + * CPU notifier helper code for blk-mq + * + * Copyright (C) 2013-2014 Jens Axboe + */ +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/blkdev.h> +#include <linux/list.h> +#include <linux/llist.h> +#include <linux/smp.h> +#include <linux/cpu.h> + +#include <linux/blk-mq.h> +#include "blk-mq.h" + +static LIST_HEAD(blk_mq_cpu_notify_list); +static DEFINE_SPINLOCK(blk_mq_cpu_notify_lock); + +static int blk_mq_main_cpu_notify(struct notifier_block *self, + unsigned long action, void *hcpu) +{ + unsigned int cpu = (unsigned long) hcpu; + struct blk_mq_cpu_notifier *notify; + int ret = NOTIFY_OK; + + if (action != CPU_POST_DEAD) + return NOTIFY_OK; + + spin_lock(&blk_mq_cpu_notify_lock); + + list_for_each_entry(notify, &blk_mq_cpu_notify_list, list) { + ret = notify->notify(notify->data, action, cpu); + if (ret != NOTIFY_OK) + break; + } + + spin_unlock(&blk_mq_cpu_notify_lock); + return ret; +} + +void blk_mq_register_cpu_notifier(struct blk_mq_cpu_notifier *notifier) +{ + BUG_ON(!notifier->notify); + + spin_lock(&blk_mq_cpu_notify_lock); + list_add_tail(¬ifier->list, &blk_mq_cpu_notify_list); + spin_unlock(&blk_mq_cpu_notify_lock); +} + +void blk_mq_unregister_cpu_notifier(struct blk_mq_cpu_notifier *notifier) +{ + spin_lock(&blk_mq_cpu_notify_lock); + list_del(¬ifier->list); + spin_unlock(&blk_mq_cpu_notify_lock); +} + +void blk_mq_init_cpu_notifier(struct blk_mq_cpu_notifier *notifier, + int (*fn)(void *, unsigned long, unsigned int), + void *data) +{ + notifier->notify = fn; + notifier->data = data; +} + +void __init blk_mq_cpu_init(void) +{ + hotcpu_notifier(blk_mq_main_cpu_notify, 0); +} |