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From: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
To: Ard Biesheuvel <ardb@kernel.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Will Deacon <will@kernel.org>, Hanjun Guo <guohanjun@huawei.com>,
	Sudeep Holla <sudeep.holla@arm.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>,
	Veronika kabatova <vkabatov@redhat.com>,
	Robin Murphy <robin.murphy@arm.com>
Subject: Re: [PATCH] ACPI: Add memory semantics to acpi_os_map_memory()
Date: Tue, 27 Jul 2021 17:38:45 +0100	[thread overview]
Message-ID: <20210727163845.GA16478@lpieralisi> (raw)
In-Reply-To: <CAMj1kXHwPXX9MxuF_cw1bq9v+qzH-M4-_ssES8WQq-YP3APthg@mail.gmail.com>

On Tue, Jul 27, 2021 at 12:09:47PM +0200, Ard Biesheuvel wrote:

[...]

> > > > +void __iomem __ref
> > > > +*acpi_os_map_iomem(acpi_physical_address phys, acpi_size size)
> > >
> > > I am aware that this just duplicated the prototype above, but I think
> > > this should be
> > >
> > > void __iomem *__ref
> > >
> > > given that the __ref comes after the * in the prototype below.
> >
> > Yes I just moved/duplicated the prototype above but I believe this is
> > consistent with include/acpi/acpi_io.h unless I have not understood
> > what you meant ?
> >
> > It is probably worth changing it in both places to
> >
> > void __iomem *__ref
> >
> > ?
> >
> > I can do that with an additional patch.
> >
> 
> Yes, as long as they are all mutually consistent. The __ref is not
> part of the type at all, so it should not be between the void and the
> *, even if the compiler appears to allow it.

Updated into a small series, will repost next week when I am back.

Thanks,
Lorenzo

> > > > +{
> > > > +       return __acpi_os_map_iomem(phys, size, false);
> > > > +}
> > > >  EXPORT_SYMBOL_GPL(acpi_os_map_iomem);
> > > >
> > > >  void *__ref acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
> > > >  {
> > > > -       return (void *)acpi_os_map_iomem(phys, size);
> > > > +       return (void *)__acpi_os_map_iomem(phys, size, true);
> > >
> > > I think this should be (__force void *) to shut up sparse address
> > > space warnings.
> >
> > Yes I can add that attribute in an additional patch and rebase this one
> > on top of it.
> >
> > Thanks,
> > Lorenzo
> >
> > >
> > > >  }
> > > >  EXPORT_SYMBOL_GPL(acpi_os_map_memory);
> > > >
> > > > diff --git a/include/acpi/acpi_io.h b/include/acpi/acpi_io.h
> > > > index 027faa8883aa..a0212e67d6f4 100644
> > > > --- a/include/acpi/acpi_io.h
> > > > +++ b/include/acpi/acpi_io.h
> > > > @@ -14,6 +14,14 @@ static inline void __iomem *acpi_os_ioremap(acpi_physical_address phys,
> > > >  }
> > > >  #endif
> > > >
> > > > +#ifndef acpi_os_memmap
> > > > +static inline void __iomem *acpi_os_memmap(acpi_physical_address phys,
> > > > +                                           acpi_size size)
> > > > +{
> > > > +       return ioremap_cache(phys, size);
> > > > +}
> > > > +#endif
> > > > +
> > > >  extern bool acpi_permanent_mmap;
> > > >
> > > >  void __iomem __ref
> > > > --
> > > > 2.31.0
> > > >

  reply	other threads:[~2021-07-27 16:38 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-26 10:00 Lorenzo Pieralisi
2021-07-26 15:55 ` Ard Biesheuvel
2021-07-27 10:06   ` Lorenzo Pieralisi
2021-07-27 10:09     ` Ard Biesheuvel
2021-07-27 16:38       ` Lorenzo Pieralisi [this message]
2021-07-27  4:21 ` Hanjun Guo
2021-08-02 15:23 ` [PATCH v2 0/3] ACPI: Fix acpi_os_map_memory() memory semantics Lorenzo Pieralisi
2021-08-02 15:37   ` Ard Biesheuvel
2021-08-23 10:35   ` [PATCH v3] ACPI: Add memory semantics to acpi_os_map_memory() Lorenzo Pieralisi
2021-08-23 10:46   ` [PATCH RESEND " Lorenzo Pieralisi
2021-08-23 12:30     ` Catalin Marinas
2021-08-25 17:46       ` Rafael J. Wysocki
2021-08-02 15:23 ` [PATCH v2 1/3] ACPI: osl: Add __force attribute in acpi_os_map_iomem() cast Lorenzo Pieralisi
2021-08-10 16:45   ` Christoph Hellwig
2021-08-11 10:40     ` Ard Biesheuvel
2021-08-11 14:01       ` Lorenzo Pieralisi
2021-08-11 14:08       ` Christoph Hellwig
2021-08-11 14:55         ` Lorenzo Pieralisi
2021-08-16  9:58           ` Lorenzo Pieralisi
2021-08-16 10:21             ` Ard Biesheuvel
2021-08-16 10:59               ` Robin Murphy
2021-08-16 13:57               ` Rafael J. Wysocki
2021-08-02 15:23 ` [PATCH v2 2/3] ACPI: osl: Reorder acpi_os_map_iomem() __ref annotation Lorenzo Pieralisi
2021-08-02 15:23 ` [PATCH v2 3/3] ACPI: Add memory semantics to acpi_os_map_memory() Lorenzo Pieralisi
2021-08-02 16:46   ` Catalin Marinas
2021-08-03  9:16     ` Lorenzo Pieralisi
2021-08-05 19:02       ` Rafael J. Wysocki

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