linux-kernel - Re: [patch V2 27/37] rseq: Implement fast path for exit to user

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Message-ID: <87ldmwzoxt.ffs@tglx>
Date: Tue, 02 Sep 2025 20:31:26 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, LKML
 <linux-kernel@...r.kernel.org>
Cc: Jens Axboe <axboe@...nel.dk>, Peter Zijlstra <peterz@...radead.org>,
 "Paul E. McKenney" <paulmck@...nel.org>, Boqun Feng
 <boqun.feng@...il.com>, Paolo Bonzini <pbonzini@...hat.com>, Sean
 Christopherson <seanjc@...gle.com>, Wei Liu <wei.liu@...nel.org>, Dexuan
 Cui <decui@...rosoft.com>, x86@...nel.org, Arnd Bergmann <arnd@...db.de>,
 Heiko Carstens <hca@...ux.ibm.com>, Christian Borntraeger
 <borntraeger@...ux.ibm.com>, Sven Schnelle <svens@...ux.ibm.com>, Huacai
 Chen <chenhuacai@...nel.org>, Paul Walmsley <paul.walmsley@...ive.com>,
 Palmer Dabbelt <palmer@...belt.com>
Subject: Re: [patch V2 27/37] rseq: Implement fast path for exit to user

On Tue, Aug 26 2025 at 11:33, Mathieu Desnoyers wrote:
> On 2025-08-23 12:40, Thomas Gleixner wrote:
>> +	 * A sane compiler requires four instructions for the nothing to do
>> +	 * case including clearing the events, but your milage might vary.
>
> See my earlier comments about:
>
> - Handling of dynamic numa node id to cpu mapping reconfiguration on
>    powerpc.

Still not relevant :)

> - Validation of the abort handler signature on production kernels.

Brought it back already.