From: Mark Rutland <mark.rutland@arm.com>
To: Jules Maselbas <jmaselbas@kalray.eu>
Cc: "Yann Sionneau" <ysionneau@kalray.eu>,
"Arnd Bergmann" <arnd@arndb.de>,
"Jonathan Corbet" <corbet@lwn.net>,
"Thomas Gleixner" <tglx@linutronix.de>,
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Subject: Re: [RFC PATCH v2 11/31] kvx: Add atomic/locking headers
Date: Thu, 26 Jan 2023 11:15:37 +0000 [thread overview]
Message-ID: <Y9Jg2QkbLUoYhimB@FVFF77S0Q05N> (raw)
In-Reply-To: <20230126095720.GF5952@tellis.lin.mbt.kalray.eu>
Hi Jules,
On Thu, Jan 26, 2023 at 10:57:20AM +0100, Jules Maselbas wrote:
> Hi Mark,
>
> On Fri, Jan 20, 2023 at 03:18:48PM +0000, Mark Rutland wrote:
> > On Fri, Jan 20, 2023 at 03:09:42PM +0100, Yann Sionneau wrote:
> > > +#define ATOMIC64_RETURN_OP(op, c_op) \
> > > +static inline long arch_atomic64_##op##_return(long i, atomic64_t *v) \
> > > +{ \
> > > + long new, old, ret; \
> > > + \
> > > + do { \
> > > + old = v->counter; \
> >
> > This should be arch_atomic64_read(v), in order to avoid the potential for the
> > compiler to replay the access and introduce ABA races and other such problems.
> Thanks for the suggestion, this will be into v3.
>
> > For details, see:
> >
> > https://lore.kernel.org/lkml/Y70SWXHDmOc3RhMd@osiris/
> > https://lore.kernel.org/lkml/Y71LoCIl+IFdy9D8@FVFF77S0Q05N/
> >
> > I see that the generic 32-bit atomic code suffers from that issue, and we
> > should fix it.
> I took a look at the generic 32-bit atomic, but I am unsure if this
> needs to be done for both the SMP and non-SMP implementations. But I
> can send a first patch and we can discuss from there.
Sounds good to me; thanks!
[...]
> > > +static inline int arch_atomic_add_return(int i, atomic_t *v)
> > > +{
> > > + int new, old, ret;
> > > +
> > > + do {
> > > + old = v->counter;
> >
> > Likewise, arch_atomic64_read(v) here.
> ack, this will bt arch_atomic_read(v) here since this is not atomic64_t
> here.
Ah, yes, my bad!
Thanks,
Mark.
next prev parent reply other threads:[~2023-01-26 11:15 UTC|newest]
Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-20 14:09 [RFC PATCH v2 00/31] Upstream kvx Linux port Yann Sionneau
2023-01-20 14:09 ` [RFC PATCH v2 01/31] Documentation: kvx: Add basic documentation Yann Sionneau
2023-01-22 9:02 ` Bagas Sanjaya
2023-01-25 18:28 ` Jules Maselbas
2023-01-26 2:23 ` Bagas Sanjaya
2023-01-22 15:02 ` Mike Rapoport
2023-01-20 14:09 ` [RFC PATCH v2 02/31] Documentation: Add binding for kalray,kv3-1-core-intc Yann Sionneau
2023-01-20 17:28 ` Rob Herring
2023-01-22 11:44 ` Krzysztof Kozlowski
2023-01-26 16:10 ` Jules Maselbas
2023-01-27 8:32 ` Krzysztof Kozlowski
2023-01-20 14:09 ` [RFC PATCH v2 03/31] Documentation: Add binding for kalray,kv3-1-apic-gic Yann Sionneau
2023-01-22 11:47 ` Krzysztof Kozlowski
2023-01-20 14:09 ` [RFC PATCH v2 04/31] Documentation: Add binding for kalray,kv3-1-apic-mailbox Yann Sionneau
2023-01-20 17:28 ` Rob Herring
2023-01-20 14:09 ` [RFC PATCH v2 05/31] Documentation: Add binding for kalray,coolidge-itgen Yann Sionneau
2023-01-22 11:49 ` Krzysztof Kozlowski
2023-01-20 14:09 ` [RFC PATCH v2 06/31] Documentation: Add binding for kalray,kv3-1-ipi-ctrl Yann Sionneau
2023-01-20 17:28 ` Rob Herring
2023-01-22 11:50 ` Krzysztof Kozlowski
2023-01-20 14:09 ` [RFC PATCH v2 07/31] Documentation: Add binding for kalray,kv3-1-pwr-ctrl Yann Sionneau
2023-01-20 17:28 ` Rob Herring
2023-01-22 11:51 ` Krzysztof Kozlowski
2023-01-20 14:09 ` [RFC PATCH v2 08/31] kvx: Add ELF-related definitions Yann Sionneau
2023-01-20 14:09 ` [RFC PATCH v2 09/31] kvx: Add build infrastructure Yann Sionneau
2023-01-20 14:39 ` Arnd Bergmann
2023-01-20 14:53 ` Jules Maselbas
2023-01-20 15:01 ` Arnd Bergmann
2023-01-20 15:03 ` Jules Maselbas
2023-01-20 14:09 ` [RFC PATCH v2 10/31] kvx: Add CPU definition headers Yann Sionneau
2023-01-20 14:09 ` [RFC PATCH v2 11/31] kvx: Add atomic/locking headers Yann Sionneau
2023-01-20 15:18 ` Mark Rutland
2023-01-26 9:57 ` Jules Maselbas
2023-01-26 11:15 ` Mark Rutland [this message]
2023-01-26 11:19 ` Jules Maselbas
2023-01-29 11:50 ` Guo Ren
2023-01-20 14:09 ` [RFC PATCH v2 12/31] kvx: Add other common headers Yann Sionneau
2023-01-20 14:29 ` Jason A. Donenfeld
2023-01-25 21:55 ` Jules Maselbas
2023-01-20 14:09 ` [RFC PATCH v2 13/31] kvx: Add boot and setup routines Yann Sionneau
2023-01-20 14:09 ` [RFC PATCH v2 14/31] kvx: Add exception/interrupt handling Yann Sionneau
2023-01-20 14:09 ` [RFC PATCH v2 15/31] irqchip: Add irq-kvx-apic-gic driver Yann Sionneau
2023-01-20 14:09 ` [RFC PATCH v2 16/31] irqchip: Add irq-kvx-itgen driver Yann Sionneau
2023-01-20 14:09 ` [RFC PATCH v2 17/31] irqchip: Add irq-kvx-apic-mailbox driver Yann Sionneau
2023-01-20 14:09 ` [RFC PATCH v2 18/31] irqchip: Add kvx-core-intc core interupt controller driver Yann Sionneau
2023-01-20 14:09 ` [RFC PATCH v2 19/31] kvx: Add process management Yann Sionneau
2023-01-20 14:09 ` [RFC PATCH v2 20/31] kvx: Add memory management Yann Sionneau
2023-01-22 16:09 ` Mike Rapoport
2023-01-20 14:09 ` [RFC PATCH v2 21/31] kvx: Add system call support Yann Sionneau
2023-01-20 14:09 ` [RFC PATCH v2 22/31] kvx: Add signal handling support Yann Sionneau
2023-01-20 14:09 ` [RFC PATCH v2 23/31] kvx: Add ELF relocations and module support Yann Sionneau
2023-01-20 14:09 ` [RFC PATCH v2 24/31] kvx: Add misc common routines Yann Sionneau
2023-01-20 14:09 ` [RFC PATCH v2 25/31] kvx: Add some library functions Yann Sionneau
2023-01-20 14:09 ` [RFC PATCH v2 26/31] kvx: Add multi-processor (SMP) support Yann Sionneau
2023-01-20 14:09 ` [RFC PATCH v2 27/31] kvx: Add kvx default config file Yann Sionneau
2023-01-22 11:58 ` Krzysztof Kozlowski
2023-01-20 14:09 ` [RFC PATCH v2 28/31] kvx: Add debugging related support Yann Sionneau
2023-01-20 14:10 ` [RFC PATCH v2 29/31] kvx: Add support for cpuinfo Yann Sionneau
2023-01-22 11:57 ` Krzysztof Kozlowski
2023-01-20 14:10 ` [RFC PATCH v2 30/31] kvx: Add power controller driver Yann Sionneau
2023-01-22 11:54 ` Krzysztof Kozlowski
2024-04-15 14:08 ` Yann Sionneau
2024-04-15 15:30 ` Arnd Bergmann
2024-04-17 19:20 ` Krzysztof Kozlowski
2023-01-20 14:10 ` [RFC PATCH v2 31/31] kvx: Add IPI driver Yann Sionneau
2023-01-22 11:54 ` Krzysztof Kozlowski
2024-01-31 9:52 ` Yann Sionneau
2024-01-31 10:12 ` Krzysztof Kozlowski
2024-01-31 10:28 ` Arnd Bergmann
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