linux-kernel - Re: [patch V6 19/31] rseq: Provide and use rseq_update_user

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Message-ID: <20251029175333.399525bb@gandalf.local.home>
Date: Wed, 29 Oct 2025 17:53:33 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: LKML <linux-kernel@...r.kernel.org>, Michael Jeanson
 <mjeanson@...icios.com>, Jens Axboe <axboe@...nel.dk>, Mathieu Desnoyers
 <mathieu.desnoyers@...icios.com>, Peter Zijlstra <peterz@...radead.org>,
 "Paul E. McKenney" <paulmck@...nel.org>, x86@...nel.org, Sean
 Christopherson <seanjc@...gle.com>, Wei Liu <wei.liu@...nel.org>
Subject: Re: [patch V6 19/31] rseq: Provide and use rseq_update_user_cs()

On Wed, 29 Oct 2025 22:00:37 +0100
Thomas Gleixner <tglx@...utronix.de> wrote:

> > Or am I missing something?  
> 
> Yes. None of this is compiled at all when CONFIG_RSEQ=n.
> 
> When CONFIG_RSEQ=y then the slowpath muck is compiled into kernel/rseq.c
> because that file defines RSEQ_BUILD_SLOW_PATH.

What I was missing was that the code was in a header file.

I mistook it as being part of rseq.c and not living in
include/linux/rseq_entry.h :-p

-- Steve