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From: Thomas Gleixner <tglx@linutronix.de>
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To: Michael Jeanson <mjeanson@efficios.com>, LKML
 <linux-kernel@vger.kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>, Peter Zijlstra <peterz@infradead.org>,
 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>, "Paul E. McKenney"
 <paulmck@kernel.org>, Boqun Feng <boqun.feng@gmail.com>, Paolo Bonzini
 <pbonzini@redhat.com>, Sean Christopherson <seanjc@google.com>, Wei Liu
 <wei.liu@kernel.org>, Dexuan Cui <decui@microsoft.com>, x86@kernel.org,
 Arnd Bergmann <arnd@arndb.de>, Heiko Carstens <hca@linux.ibm.com>,
 Christian Borntraeger <borntraeger@linux.ibm.com>, Sven Schnelle
 <svens@linux.ibm.com>, Huacai Chen <chenhuacai@kernel.org>, Paul Walmsley
 <paul.walmsley@sifive.com>, Palmer Dabbelt <palmer@dabbelt.com>
Subject: Re: [patch V2 18/37] rseq: Provide static branch for runtime debugging
In-Reply-To: <f3131178-7e69-4d38-bb99-4b063f409a66@efficios.com>
References: <20250823161326.635281786@linutronix.de>
 <20250823161654.421576400@linutronix.de>
 <f3131178-7e69-4d38-bb99-4b063f409a66@efficios.com>
Date: Tue, 02 Sep 2025 15:56:18 +0200
Message-ID: <87bjnt0xh9.ffs@tglx>
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On Mon, Aug 25 2025 at 16:30, Michael Jeanson wrote:
> On 2025-08-23 12:39, Thomas Gleixner wrote:
>> +static int __init rseq_setup_debug(char *str)
>> +{
>> +	bool on;
>> +
>> +	if (kstrtobool(str, &on))
>> +		return -EINVAL;
>> +	rseq_control_debug(on);
>> +	return 0;
>
> Functions used by __setup() have to return '1' to signal that the 
> argument was handled, otherwise you get this in the kernel log:
>
> kernel: Unknown kernel command line parameters "rseq_debug=1", will be 
> passed to user space.

Duh, yes.