linux-kernel - Re: [patch V2 36/37] rseq: Switch to TIF

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Message-ID: <87ikhyxv2t.ffs@tglx>
Date: Thu, 04 Sep 2025 14:26:18 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: Sean Christopherson <seanjc@...gle.com>
Cc: LKML <linux-kernel@...r.kernel.org>, Jens Axboe <axboe@...nel.dk>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Peter Zijlstra
 <peterz@...radead.org>, "Paul E. McKenney" <paulmck@...nel.org>, Boqun
 Feng <boqun.feng@...il.com>, Paolo Bonzini <pbonzini@...hat.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 36/37] rseq: Switch to TIF_RSEQ if supported

On Thu, Sep 04 2025 at 03:08, Sean Christopherson wrote:
> On Tue, Sep 02, 2025, Thomas Gleixner wrote:
>> I'm happy to add a comment which explains that.
>
> And maybe a BUILD_BUG_ON() to assert that TIF_RSEQ != TIF_NOTIFY_RESUME?  My main
> interest is documenting why the generic implementation doesn't need to re-raise
> TIF_NOTIFY_RESUME.  E.g. something like this?

Done.