linux-kernel - Re: [PATCH 10/13] tracing/uprobes: Fetch args before reserving a ring buffer

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Message-ID: <87wqmxrri4.fsf@sejong.aot.lge.com>
Date:	Wed, 04 Sep 2013 16:10:59 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	"zhangwei\(Jovi\)" <jovi.zhangwei@...wei.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Namhyung Kim <namhyung.kim@....com>,
	Hyeoncheol Lee <cheol.lee@....com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Subject: Re: [PATCH 10/13] tracing/uprobes: Fetch args before reserving a ring buffer

Hi Jovi,

[SNIP]

On Tue, 3 Sep 2013 19:10:04 +0800, zhangwei wrote:
>> +	if (atomic_inc_return(&uprobe_buffer_ref) == 1) {
>> +		int cpu;
>> +
>> +		uprobe_cpu_buffer = __alloc_percpu(PAGE_SIZE, PAGE_SIZE);
>> +		if (uprobe_cpu_buffer == NULL)
>> +			return -ENOMEM;
>> +
>
> Do we need add atomic_dec if allocate percpu buffer failed?

Good catch!  I'll fix it. :)

Thanks,
Namhyung


>
>> +		for_each_possible_cpu(cpu)
>> +			mutex_init(&per_cpu(uprobe_cpu_mutex, cpu));
>> +	}
>> +
>>  	WARN_ON(!uprobe_filter_is_empty(&tu->filter));
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