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

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Date:   Wed, 26 Jul 2023 12:41:48 -0700
From:   Josh Poimboeuf <jpoimboe@...nel.org>
To:     Valentin Schneider <vschneid@...hat.com>
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,
        bpf@...r.kernel.org, x86@...nel.org, rcu@...r.kernel.org,
        linux-kselftest@...r.kernel.org,
        Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
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        Yair Podemsky <ypodemsk@...hat.com>
Subject: Re: [RFC PATCH v2 02/20] tracing/filters: Enable filtering a cpumask
 field by another cpumask

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?

> +
> +		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