linux-kernel - Re: [PATCH 1/4] mm/shmem: check return value of shmem_init

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Date:   Wed, 1 Jun 2022 21:34:40 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     Matthew Wilcox <willy@...radead.org>,
        Chen Wandun <chenwandun@...wei.com>
CC:     <hughd@...gle.com>, <akpm@...ux-foundation.org>,
        <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/4] mm/shmem: check return value of shmem_init_inodecache


On 2022/6/1 20:54, Matthew Wilcox wrote:
> On Wed, Jun 01, 2022 at 08:44:14PM +0800, Chen Wandun wrote:
>> -static void shmem_init_inodecache(void)
>> +static struct kmem_cache *shmem_init_inodecache(void)
>>   {
>>   	shmem_inode_cachep = kmem_cache_create("shmem_inode_cache",
>>   				sizeof(struct shmem_inode_info),
>>   				0, SLAB_PANIC|SLAB_ACCOUNT, shmem_init_inode);
>> +
>> +	return shmem_inode_cachep;
>>   }
>>   
>>   static void shmem_destroy_inodecache(void)
>> @@ -3924,7 +3926,10 @@ void __init shmem_init(void)
>>   {
>>   	int error;
>>   
>> -	shmem_init_inodecache();
>> +	if (!shmem_init_inodecache()) {
>> +		error = -ENOMEM;
>> +		goto out2;
>> +	}
> better to return the errno from shmem_init_inodecache():
>
> 	error = shmem_init_inodecache();

kmem_cache_create return a pointer to the cache on success, NULL on failure，
so error = -ENOMEM; is right  :)

> 	if (error)
> 		goto out2;
>
> .