linux-kernel - Re: [RFC PATCH for 4.17 02/21] rseq: Introduce restartable sequences system call (v12)

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Message-ID: <20180328112225.GT4043@hirez.programming.kicks-ass.net>
Date:   Wed, 28 Mar 2018 13:22:25 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:     "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Andy Lutomirski <luto@...capital.net>,
        Dave Watson <davejwatson@...com>, linux-kernel@...r.kernel.org,
        linux-api@...r.kernel.org, Paul Turner <pjt@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Russell King <linux@....linux.org.uk>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>, Andrew Hunter <ahh@...gle.com>,
        Andi Kleen <andi@...stfloor.org>, Chris Lameter <cl@...ux.com>,
        Ben Maurer <bmaurer@...com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Josh Triplett <josh@...htriplett.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Alexander Viro <viro@...iv.linux.org.uk>
Subject: Re: [RFC PATCH for 4.17 02/21] rseq: Introduce restartable sequences
 system call (v12)

On Tue, Mar 27, 2018 at 12:05:23PM -0400, Mathieu Desnoyers wrote:
> +/*
> + * struct rseq_cs is aligned on 4 * 8 bytes to ensure it is always
> + * contained within a single cache-line. It is usually declared as
> + * link-time constant data.
> + */
> +struct rseq_cs {
> +	/* Version of this structure. */
> +	uint32_t version;
> +	/* enum rseq_cs_flags */
> +	uint32_t flags;
> +	LINUX_FIELD_u32_u64(start_ip);
> +	/* Offset from start_ip. */
> +	LINUX_FIELD_u32_u64(post_commit_offset);
> +	LINUX_FIELD_u32_u64(abort_ip);
> +} __attribute__((aligned(4 * sizeof(uint64_t))));

What's with the uint32_t ? The normal Linux API type is __u32 afaik.