From: David Marchand <david.marchand@redhat.com>
To: "Gaëtan Rivet" <grive@u256.net>
Cc: dev@dpdk.org, Thomas Monjalon <thomas@monjalon.net>
Subject: Re: [PATCH v2 00/20] Enable lock annotations on most libraries and drivers
Date: Sat, 25 Feb 2023 11:16:41 +0100 [thread overview]
Message-ID: <CAJFAV8w_aPsQr4eg1RNph+1umqa9SKXyvAGU-NP2gLF6=fM1yA@mail.gmail.com> (raw)
In-Reply-To: <095511d4-4fbb-47a8-a8a5-f2a3b932c01f@app.fastmail.com>
Salut Gaëtan,
On Fri, Feb 24, 2023 at 4:59 PM Gaëtan Rivet <grive@u256.net> wrote:
> > FreeBSD libc pthread API has lock annotations while Linux glibc has
> > none.
> > We could simply disable the check on FreeBSD, but having this check,
> > a few issues got raised in drivers that are built with FreeBSD.
> > For now, I went with a simple #ifdef FreeBSD for pthread mutex related
> > annotations in our code.
> >
>
> Hi David,
>
> This is a great change, thanks for doing it.
> However I am not sure I understand the logic regarding the '#ifdef FREEBSD'.
>
> These annotations provide static hints to clang's thread safety analysis.
> What is the dependency on FreeBSD glibc?
FreeBSD libc added clang annotations, while glibc did not.
FreeBSD 13.1 libc:
int pthread_mutex_lock(pthread_mutex_t * __mutex)
__locks_exclusive(*__mutex);
With:
#if __has_extension(c_thread_safety_attributes)
#define __lock_annotate(x) __attribute__((x))
#else
#define __lock_annotate(x)
#endif
/* Function acquires an exclusive or shared lock. */
#define __locks_exclusive(...) \
__lock_annotate(exclusive_lock_function(__VA_ARGS__))
glibc:
extern int pthread_mutex_lock (pthread_mutex_t *__mutex)
__THROWNL __nonnull ((1));
Since glibc does not declare that pthread_mutex_t is lockable, adding
an annotation triggers an error for Linux (taking eal_common_proc.c
patch 14 as an example):
../lib/eal/common/eal_common_proc.c:911:2: error:
'exclusive_locks_required' attribute requires arguments whose type is
annotated with 'capability' attribute; type here is 'pthread_mutex_t'
[-Werror,-Wthread-safety-attributes]
__rte_exclusive_locks_required(pending_requests.lock)
^
../lib/eal/include/rte_lock_annotations.h:23:17: note: expanded from
macro '__rte_exclusive_locks_required'
__attribute__((exclusive_locks_required(__VA_ARGS__)))
^
We could wrap this annotation in a new construct (which would require
some build time check wrt pthread API state).
Not sure it is worth the effort though, for now.
--
David Marchand
next prev parent reply other threads:[~2023-02-25 10:16 UTC|newest]
Thread overview: 76+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-24 8:16 [PATCH 00/14] " David Marchand
2023-02-24 8:16 ` [PATCH 01/14] malloc: rework heap lock handling David Marchand
2023-02-24 8:16 ` [PATCH 02/14] mem: rework malloc heap init David Marchand
2023-02-24 8:16 ` [PATCH 03/14] mem: annotate shared memory config locks David Marchand
2023-02-24 8:16 ` [PATCH 04/14] hash: annotate cuckoo hash lock David Marchand
2023-02-24 8:16 ` [PATCH 05/14] graph: annotate graph lock David Marchand
2023-02-24 8:16 ` [PATCH 06/14] drivers: inherit lock annotations for Intel drivers David Marchand
2023-02-24 8:16 ` [PATCH 07/14] net/cxgbe: inherit lock annotations David Marchand
2023-02-24 8:16 ` [PATCH 08/14] net/fm10k: annotate mailbox lock David Marchand
2023-02-24 8:16 ` [PATCH 09/14] net/sfc: rework locking in proxy code David Marchand
2023-02-24 8:16 ` [PATCH 10/14] net/sfc: inherit lock annotations David Marchand
2023-02-24 8:16 ` [PATCH 11/14] net/virtio: annotate lock for guest announce David Marchand
2023-02-24 8:16 ` [PATCH 12/14] raw/ifpga: inherit lock annotations David Marchand
2023-02-24 8:16 ` [PATCH 13/14] vdpa/sfc: " David Marchand
2023-02-24 8:16 ` [PATCH 14/14] enable lock check David Marchand
2023-02-24 15:11 ` [PATCH v2 00/20] Enable lock annotations on most libraries and drivers David Marchand
2023-02-24 15:11 ` [PATCH v2 01/20] malloc: rework heap lock handling David Marchand
2023-02-24 15:11 ` [PATCH v2 02/20] mem: rework malloc heap init David Marchand
2023-02-24 15:11 ` [PATCH v2 03/20] mem: annotate shared memory config locks David Marchand
2023-02-24 15:11 ` [PATCH v2 04/20] hash: annotate cuckoo hash lock David Marchand
2023-02-24 15:11 ` [PATCH v2 05/20] graph: annotate graph lock David Marchand
2023-02-24 15:11 ` [PATCH v2 06/20] drivers: inherit lock annotations for Intel drivers David Marchand
2023-02-24 15:11 ` [PATCH v2 07/20] net/cxgbe: inherit lock annotations David Marchand
2023-02-24 15:11 ` [PATCH v2 08/20] net/fm10k: annotate mailbox lock David Marchand
2023-02-24 15:11 ` [PATCH v2 09/20] net/sfc: rework locking in proxy code David Marchand
2023-02-24 15:11 ` [PATCH v2 10/20] net/sfc: inherit lock annotations David Marchand
2023-02-24 15:11 ` [PATCH v2 11/20] net/virtio: annotate lock for guest announce David Marchand
2023-02-27 2:05 ` Xia, Chenbo
2023-02-27 8:24 ` David Marchand
2023-02-27 16:28 ` Maxime Coquelin
2023-02-28 2:45 ` Xia, Chenbo
2023-03-02 9:26 ` David Marchand
2023-03-02 9:28 ` Maxime Coquelin
2023-03-02 12:35 ` David Marchand
2023-02-24 15:11 ` [PATCH v2 12/20] raw/ifpga: inherit lock annotations David Marchand
2023-02-27 6:29 ` Xu, Rosen
2023-02-27 7:15 ` Huang, Wei
2023-02-24 15:11 ` [PATCH v2 13/20] vdpa/sfc: " David Marchand
2023-02-24 15:11 ` [PATCH v2 14/20] ipc: annotate pthread mutex David Marchand
2023-02-24 15:11 ` [PATCH v2 15/20] ethdev: " David Marchand
2023-02-24 15:11 ` [PATCH v2 16/20] net/failsafe: fix mutex locking David Marchand
2023-02-24 15:35 ` Gaëtan Rivet
2023-02-24 15:11 ` [PATCH v2 17/20] net/failsafe: annotate pthread mutex David Marchand
2023-02-24 15:11 ` [PATCH v2 18/20] net/hinic: " David Marchand
2023-02-24 15:11 ` [PATCH v2 19/20] eal/windows: disable lock check on alarm code David Marchand
2023-02-24 15:11 ` [PATCH v2 20/20] enable lock check David Marchand
2023-02-27 2:32 ` Xia, Chenbo
2023-02-24 15:58 ` [PATCH v2 00/20] Enable lock annotations on most libraries and drivers Gaëtan Rivet
2023-02-25 10:16 ` David Marchand [this message]
2023-02-27 16:12 ` Gaëtan Rivet
2023-03-02 8:52 ` David Marchand
2023-04-03 10:52 ` David Marchand
2023-04-03 15:03 ` Tyler Retzlaff
2023-04-03 15:36 ` Tyler Retzlaff
2023-04-04 7:45 ` David Marchand
2023-04-04 12:48 ` [PATCH v3 00/16] " David Marchand
2023-04-04 12:48 ` [PATCH v3 01/16] malloc: rework heap destroy David Marchand
2023-04-04 12:48 ` [PATCH v3 02/16] mem: rework malloc heap init David Marchand
2023-04-04 12:48 ` [PATCH v3 03/16] mem: annotate shared memory config locks David Marchand
2023-04-04 12:48 ` [PATCH v3 04/16] hash: annotate cuckoo hash lock David Marchand
2023-04-04 12:48 ` [PATCH v3 05/16] graph: annotate graph lock David Marchand
2023-04-04 12:48 ` [PATCH v3 06/16] drivers: inherit lock annotations for Intel drivers David Marchand
2023-04-04 12:48 ` [PATCH v3 07/16] net/cxgbe: inherit lock annotations David Marchand
2023-04-04 12:48 ` [PATCH v3 08/16] net/fm10k: annotate mailbox lock David Marchand
2023-04-04 12:48 ` [PATCH v3 09/16] net/sfc: rework locking in proxy code David Marchand
2023-04-04 12:48 ` [PATCH v3 10/16] net/sfc: inherit lock annotations David Marchand
2023-04-04 12:48 ` [PATCH v3 11/16] net/virtio: rework guest announce notify helper David Marchand
2023-04-04 12:48 ` [PATCH v3 12/16] raw/ifpga: inherit lock annotations David Marchand
2023-04-04 12:48 ` [PATCH v3 13/16] vdpa/sfc: " David Marchand
2023-04-04 12:48 ` [PATCH v3 14/16] net/failsafe: fix mutex locking David Marchand
2023-04-04 12:48 ` [PATCH v3 15/16] eal/windows: disable lock check on alarm code David Marchand
2023-04-04 16:08 ` Tyler Retzlaff
2023-04-04 21:02 ` Dmitry Kozlyuk
2023-04-04 12:48 ` [PATCH v3 16/16] enable lock check David Marchand
2023-04-11 3:21 ` Sachin Saxena (OSS)
2023-04-23 20:09 ` [PATCH v3 00/16] Enable lock annotations on most libraries and drivers Thomas Monjalon
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='CAJFAV8w_aPsQr4eg1RNph+1umqa9SKXyvAGU-NP2gLF6=fM1yA@mail.gmail.com' \
--to=david.marchand@redhat.com \
--cc=dev@dpdk.org \
--cc=grive@u256.net \
--cc=thomas@monjalon.net \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).