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Message-ID: <YgBDDVZSZqID8L3R@hirez.programming.kicks-ass.net>
Date: Sun, 6 Feb 2022 22:52:13 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
"Paul E . McKenney" <paulmck@...nel.org>,
Boqun Feng <boqun.feng@...il.com>,
"H . Peter Anvin" <hpa@...or.com>, Paul Turner <pjt@...gle.com>,
linux-api@...r.kernel.org,
Christian Brauner <christian.brauner@...ntu.com>,
Florian Weimer <fw@...eb.enyo.de>, David.Laight@...lab.com,
carlos@...hat.com, Peter Oskolkov <posk@...k.io>,
libc-coord@...ts.openwall.com
Subject: Re: [RFC PATCH 3/3] rseq: extend struct rseq with numa node id
On Thu, Feb 03, 2022 at 02:38:53PM -0500, Mathieu Desnoyers wrote:
> +static int rseq_reset_rseq_cpu_node_id(struct task_struct *t)
> {
> - u32 cpu_id_start = 0, cpu_id = RSEQ_CPU_ID_UNINITIALIZED;
> + u32 cpu_id_start = 0, cpu_id = RSEQ_CPU_ID_UNINITIALIZED, node_id = 0;
>
> /*
> * Reset cpu_id_start to its initial state (0).
> @@ -124,6 +126,11 @@ static int rseq_reset_rseq_cpu_id(struct task_struct *t)
> */
> if (put_user(cpu_id, &t->rseq->cpu_id))
> return -EFAULT;
> + /*
> + * Reset node_id to its initial state (0).
> + */
> + if (put_user(node_id, &t->rseq->node_id))
> + return -EFAULT;
Why 0 vs -1 ?
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