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

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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,
        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>,
        Jonathan Corbet <corbet@....net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Neeraj Upadhyay <quic_neeraju@...cinc.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Josh Triplett <josh@...htriplett.org>,
        Boqun Feng <boqun.feng@...il.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Zqiang <qiang.zhang1211@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Uladzislau Rezki <urezki@...il.com>,
        Christoph Hellwig <hch@...radead.org>,
        Lorenzo Stoakes <lstoakes@...il.com>,
        Jason Baron <jbaron@...mai.com>,
        Kees Cook <keescook@...omium.org>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Juerg Haefliger <juerg.haefliger@...onical.com>,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Nadav Amit <namit@...are.com>,
        Dan Carpenter <error27@...il.com>,
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        Yang Jihong <yangjihong1@...wei.com>,
        Petr Mladek <pmladek@...e.com>,
        "Jason A. Donenfeld" <Jason@...c4.com>, Song Liu <song@...nel.org>,
        Julian Pidancet <julian.pidancet@...cle.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Dionna Glaze <dionnaglaze@...gle.com>,
        Thomas Weißschuh <linux@...ssschuh.net>,
        Juri Lelli <juri.lelli@...hat.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Marcelo Tosatti <mtosatti@...hat.com>,
        Yair Podemsky <ypodemsk@...hat.com>
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