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Commit 199f0ca5 authored by Akinobu Mita's avatar Akinobu Mita Committed by Linus Torvalds
Browse files

idr: create idr_layer_cache at boot time 



Avoid a possible kmem_cache_create() failure by creating idr_layer_cache
unconditionary at boot time rather than creating it on-demand when idr_init()
is called the first time.

This change also enables us to eliminate the check every time idr_init() is
called.

[akpm@linux-foundation.org: rename init_id_cache() to idr_init_cache()]
[akpm@linux-foundation.org: fix alpha build]
Signed-off-by: default avatarAkinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 801678c5

include/linux/idr.h

+3 −0
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ 


#include <linux/types.h>

#include <linux/bitops.h>

#include <linux/init.h>



#if BITS_PER_LONG == 32

# define IDR_BITS 5
@@ -115,4 +116,6 @@ void ida_remove(struct ida *ida, int id); 
void ida_destroy(struct ida *ida);

void ida_init(struct ida *ida);



void __init idr_init_cache(void);



#endif /* __IDR_H__ */

init/main.c

+2 −0
Original line number Diff line number Diff line
@@ -58,6 +58,7 @@ 
#include <linux/kthread.h>

#include <linux/sched.h>

#include <linux/signal.h>

#include <linux/idr.h>



#include <asm/io.h>

#include <asm/bugs.h>
@@ -637,6 +638,7 @@ asmlinkage void __init start_kernel(void) 
	enable_debug_pagealloc();

	cpu_hotplug_init();

	kmem_cache_init();

	idr_init_cache();

	setup_per_cpu_pageset();

	numa_policy_init();

	if (late_time_init)

lib/idr.c

+4 −6
Original line number Diff line number Diff line
@@ -585,12 +585,11 @@ static void idr_cache_ctor(struct kmem_cache *idr_layer_cache, void *idr_layer) 
	memset(idr_layer, 0, sizeof(struct idr_layer));

}



static  int init_id_cache(void)

void __init idr_init_cache(void)

{

	if (!idr_layer_cache)

	idr_layer_cache = kmem_cache_create("idr_layer_cache",

			sizeof(struct idr_layer), 0, 0, idr_cache_ctor);

	return 0;

				sizeof(struct idr_layer), 0, SLAB_PANIC,

				idr_cache_ctor);

}



/**
@@ -602,7 +601,6 @@ static int init_id_cache(void) 
 */

void idr_init(struct idr *idp)

{

	init_id_cache();

	memset(idp, 0, sizeof(struct idr));

	spin_lock_init(&idp->lock);

}