linux-kernel - Re: [RFC PATCH v2 02/20] tracing/filters: Enable filtering a cpumask field by another cpumask

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Message-ID: <xhsmho7jxsn46.mognet@vschneid.remote.csb>
Date:   Thu, 27 Jul 2023 10:46:33 +0100
From:   Valentin Schneider <vschneid@...hat.com>
To:     Josh Poimboeuf <jpoimboe@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, kvm@...r.kernel.org, linux-mm@...ck.org,
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Subject: Re: [RFC PATCH v2 02/20] tracing/filters: Enable filtering a
 cpumask field by another cpumask

On 26/07/23 12:41, Josh Poimboeuf wrote:
> On Thu, Jul 20, 2023 at 05:30:38PM +0100, Valentin Schneider wrote:
>>  int filter_assign_type(const char *type)
>>  {
>> -	if (strstr(type, "__data_loc") && strstr(type, "char"))
>> -		return FILTER_DYN_STRING;
>> +	if (strstr(type, "__data_loc")) {
>> +		if (strstr(type, "char"))
>> +			return FILTER_DYN_STRING;
>> +		if (strstr(type, "cpumask_t"))
>> +			return FILTER_CPUMASK;
>> +		}
>
> The closing bracket has the wrong indentation.
>
>> +		/* Copy the cpulist between { and } */
>> +		tmp = kmalloc((i - maskstart) + 1, GFP_KERNEL);
>> +		strscpy(tmp, str + maskstart, (i - maskstart) + 1);
>
> Need to check kmalloc() failure?  And also free tmp?
>

Heh, indeed, shoddy that :-)

Thanks!

>> +
>> +		pred->mask = kzalloc(cpumask_size(), GFP_KERNEL);
>> +		if (!pred->mask)
>> +			goto err_mem;
>> +
>> +		/* Now parse it */
>> +		if (cpulist_parse(tmp, pred->mask)) {
>> +			parse_error(pe, FILT_ERR_INVALID_CPULIST, pos + i);
>> +			goto err_free;
>> +		}
>> +
>> +		/* Move along */
>> +		i++;
>> +		if (field->filter_type == FILTER_CPUMASK)
>> +			pred->fn_num = FILTER_PRED_FN_CPUMASK;
>> +
>
> --
> Josh