linux-kernel - Re: [RFC PATCH v2 4/8] smp: Trace IPIs sent via arch_send_call_function_ipi

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <xhsmhk03ty804.mognet@vschneid.remote.csb>
Date:   Thu, 17 Nov 2022 14:23:55 +0000
From:   Valentin Schneider <vschneid@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     linux-alpha@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-snps-arc@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-csky@...r.kernel.org,
        linux-hexagon@...r.kernel.org, linux-ia64@...r.kernel.org,
        loongarch@...ts.linux.dev, linux-mips@...r.kernel.org,
        openrisc@...ts.librecores.org, linux-parisc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org,
        linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
        sparclinux@...r.kernel.org, linux-xtensa@...ux-xtensa.org,
        x86@...nel.org, "Paul E. McKenney" <paulmck@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Juri Lelli <juri.lelli@...hat.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Marcelo Tosatti <mtosatti@...hat.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, Marc Zyngier <maz@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        Nicholas Piggin <npiggin@...il.com>,
        Guo Ren <guoren@...nel.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [RFC PATCH v2 4/8] smp: Trace IPIs sent via
 arch_send_call_function_ipi_mask()

On 17/11/22 10:08, Peter Zijlstra wrote:
> On Wed, Nov 02, 2022 at 06:33:32PM +0000, Valentin Schneider wrote:
>> This simply wraps around the arch function and prepends it with a
>> tracepoint, similar to send_call_function_single_ipi().
>>
>> Signed-off-by: Valentin Schneider <vschneid@...hat.com>
>> ---
>>  kernel/smp.c | 9 ++++++++-
>>  1 file changed, 8 insertions(+), 1 deletion(-)
>>
>> diff --git a/kernel/smp.c b/kernel/smp.c
>> index e2ca1e2f31274..c4d561cf50d45 100644
>> --- a/kernel/smp.c
>> +++ b/kernel/smp.c
>> @@ -160,6 +160,13 @@ void __init call_function_init(void)
>>      smpcfd_prepare_cpu(smp_processor_id());
>>  }
>>
>> +static inline void
>
> Given the use of _RET_IP_, I would strongly recommend you use
> __always_inline.
>

Noted, thanks

>> +send_call_function_ipi_mask(const struct cpumask *mask)
>> +{
>> +	trace_ipi_send_cpumask(mask, _RET_IP_, func);
>
> What's func?
>

A rebase fail... That's only plugged in later.

>> +	arch_send_call_function_ipi_mask(mask);
>> +}