From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
To: Florian Weimer <fweimer@redhat.com>
Cc: libc-alpha <libc-alpha@sourceware.org>
Subject: Re: [PATCH 2/5] nptl: Add rseq registration
Date: Mon, 6 Dec 2021 11:59:26 -0500 (EST) [thread overview]
Message-ID: <1780152866.15126.1638809966443.JavaMail.zimbra@efficios.com> (raw)
In-Reply-To: <9c58724d604e160ebda5f667331fa41416c0d12b.1638798186.git.fweimer@redhat.com>
----- On Dec 6, 2021, at 8:46 AM, Florian Weimer fweimer@redhat.com wrote:
[...]
> @@ -406,6 +407,9 @@ struct pthread
> /* Used on strsignal. */
> struct tls_internal_t tls_state;
>
> + /* rseq area registered with the kernel. */
> + struct rseq rseq_area;
The rseq UAPI requires that the fields within the rseq_area
are read-written with single-copy atomicity semantics.
So either we define a "volatile struct rseq" here, or we'll need
to wrap all accesses with the proper volatile casts, or use the
relaxed_mo atomic accesses.
Thanks,
Mathieu
> +
> /* This member must be last. */
> char end_padding[];
>
--
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
next prev parent reply other threads:[~2021-12-06 16:59 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-06 13:45 [PATCH 0/5] Extensible rseq support for glibc Florian Weimer
2021-12-06 13:46 ` [PATCH 1/5] nptl: Add <thread_pointer.h> for defining __thread_pointer Florian Weimer
2021-12-06 16:44 ` Mathieu Desnoyers
2021-12-06 17:01 ` Florian Weimer
2021-12-06 19:55 ` Florian Weimer
2021-12-06 13:46 ` [PATCH 2/5] nptl: Add rseq registration Florian Weimer
2021-12-06 16:53 ` Mathieu Desnoyers
2021-12-06 17:10 ` Florian Weimer
2021-12-06 16:59 ` Mathieu Desnoyers [this message]
2021-12-06 17:14 ` Florian Weimer
2021-12-06 18:52 ` Mathieu Desnoyers
2021-12-06 19:03 ` Florian Weimer
2021-12-06 20:11 ` Paul E. McKenney
2021-12-06 20:26 ` Florian Weimer
2021-12-06 21:08 ` Paul E. McKenney
2021-12-06 13:46 ` [PATCH 3/5] Linux: Use rseq to accelerate sched_getcpu Florian Weimer
2021-12-06 16:50 ` Szabolcs Nagy
2021-12-06 17:06 ` Florian Weimer
2021-12-06 17:45 ` Szabolcs Nagy
2021-12-07 15:48 ` Florian Weimer
2021-12-06 13:46 ` [PATCH 4/5] nptl: Add glibc.pthread.rseq tunable to control rseq registration Florian Weimer
2021-12-06 13:53 ` [PATCH 5/5] nptl: Add public rseq symbols and <sys/rseq.h> Florian Weimer
2021-12-07 11:01 ` Szabolcs Nagy
2021-12-07 11:28 ` Florian Weimer
2021-12-06 16:13 ` [PATCH 0/5] Extensible rseq support for glibc Mathieu Desnoyers
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