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fs/buffer: Convert to hotplug state machine 

Install the callbacks via the state machine.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-fsdevel@vger.kernel.org
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20161103145021.28528-2-bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Sebastian Andrzej Siewior 2016-11-03 15:49:57 +01:00 committed by Thomas Gleixner
parent bc33b0ca11
commit fc4d24c9b4
2 changed files with 7 additions and 10 deletions
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16
fs/buffer.c
View File

@ -3403,7 +3403,7 @@ void free_buffer_head(struct buffer_head *bh)
}
EXPORT_SYMBOL(free_buffer_head);
static void buffer_exit_cpu(int cpu)
static int buffer_exit_cpu_dead(unsigned int cpu)
{
int i;
struct bh_lru *b = &per_cpu(bh_lrus, cpu);
@ -3414,14 +3414,7 @@ static void buffer_exit_cpu(int cpu)
}
this_cpu_add(bh_accounting.nr, per_cpu(bh_accounting, cpu).nr);
per_cpu(bh_accounting, cpu).nr = 0;
}
static int buffer_cpu_notify(struct notifier_block *self,
unsigned long action, void *hcpu)
{
if (action == CPU_DEAD || action == CPU_DEAD_FROZEN)
buffer_exit_cpu((unsigned long)hcpu);
return NOTIFY_OK;
return 0;
}
/**
@ -3471,6 +3464,7 @@ EXPORT_SYMBOL(bh_submit_read);
void __init buffer_init(void)
{
unsigned long nrpages;
int ret;
bh_cachep = kmem_cache_create("buffer_head",
sizeof(struct buffer_head), 0,
@ -3483,5 +3477,7 @@ void __init buffer_init(void)
*/
nrpages = (nr_free_buffer_pages() * 10) / 100;
max_buffer_heads = nrpages * (PAGE_SIZE / sizeof(struct buffer_head));
hotcpu_notifier(buffer_cpu_notify, 0);
ret = cpuhp_setup_state_nocalls(CPUHP_FS_BUFF_DEAD, "fs/buffer:dead",
NULL, buffer_exit_cpu_dead);
WARN_ON(ret < 0);
}

1
include/linux/cpuhotplug.h
View File

@ -30,6 +30,7 @@ enum cpuhp_state {
CPUHP_ACPI_CPUDRV_DEAD,
CPUHP_S390_PFAULT_DEAD,
CPUHP_BLK_MQ_DEAD,
CPUHP_FS_BUFF_DEAD,
CPUHP_WORKQUEUE_PREP,
CPUHP_POWER_NUMA_PREPARE,
CPUHP_HRTIMERS_PREPARE,