linux-kernel - Re: [PATCH v2 7/9] trace_uprobe/sdt: Fix multiple update of same reference counter

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Message-Id: <90d2fc35-0d58-1cab-a474-642192c7e1ff@linux.vnet.ibm.com>
Date:   Mon, 9 Apr 2018 19:02:02 +0530
From:   Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
To:     Oleg Nesterov <oleg@...hat.com>
Cc:     mhiramat@...nel.org, peterz@...radead.org,
        srikar@...ux.vnet.ibm.com, rostedt@...dmis.org, acme@...nel.org,
        ananth@...ux.vnet.ibm.com, akpm@...ux-foundation.org,
        alexander.shishkin@...ux.intel.com, alexis.berlemont@...il.com,
        corbet@....net, dan.j.williams@...el.com, jolsa@...hat.com,
        kan.liang@...el.com, kjlx@...pleofstupid.com,
        kstewart@...uxfoundation.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        milian.wolff@...b.com, mingo@...hat.com, namhyung@...nel.org,
        naveen.n.rao@...ux.vnet.ibm.com, pc@...ibm.com, tglx@...utronix.de,
        yao.jin@...ux.intel.com, fengguang.wu@...el.com,
        jglisse@...hat.com,
        Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
Subject: Re: [PATCH v2 7/9] trace_uprobe/sdt: Fix multiple update of same
 reference counter

Hi Oleg,

On 04/09/2018 06:47 PM, Oleg Nesterov wrote:
> On 04/04, Ravi Bangoria wrote:
>> +static void sdt_add_mm_list(struct trace_uprobe *tu, struct mm_struct *mm)
>> +{
>> +	struct mmu_notifier *mn;
>> +	struct sdt_mm_list *sml = kzalloc(sizeof(*sml), GFP_KERNEL);
>> +
>> +	if (!sml)
>> +		return;
>> +	sml->mm = mm;
>> +	list_add(&(sml->list), &(tu->sml.list));
>> +
>> +	/* Register mmu_notifier for this mm. */
>> +	mn = kzalloc(sizeof(*mn), GFP_KERNEL);
>> +	if (!mn)
>> +		return;
>> +
>> +	mn->ops = &sdt_mmu_notifier_ops;
>> +	__mmu_notifier_register(mn, mm);
>> +}
> I didn't read this version yet, just one question...
>
> So now it depends on CONFIG_MMU_NOTIFIER, yes? I do not see any changes in Kconfig
> files, this doesn't look right...

Yes, you are write. I'll make CONFIG_UPROBE_EVENTS dependent on
CONFIG_MMU_NOTIFIER.

Thanks,
Ravi