From: Christoph Hellwig <hch@infradead.org>
To: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 2/4] mm: ioremap: Add arch_ioremap/iounmap_check()
Date: Thu, 28 Apr 2022 08:46:01 -0700 [thread overview]
Message-ID: <Ymq2uX/Y15HlIpo7@infradead.org> (raw)
In-Reply-To: <8d5c41a6-0478-bd5c-a37b-06a37101fc31@huawei.com>
On Thu, Apr 28, 2022 at 02:16:39PM +0800, Kefeng Wang wrote:
> > Pet peeve. The word "check" is a poor one. I gives no sense of what
> > the function is checking and it gives no sense of how the function's
> > return value relates to the thing which it checks.
> >
> > Maybe it returns 0 on success and -EINVAL on failure. Don't know!
> >
> > Don't you think that better names would be io_remap_ok(),
> > io_remap_valid(), io_remap_allowed(), etc?
>
> Will use arch_ioremap/unmap_allowed(), and I'd like to keep return bool
>
> for now if there is no special requirements.
Actually, there are a few architectures that can successfully ioreamp
without setting up new ptes, e.g. mips.
So I think I'd name them just arch_ioremap and arch_iounmap, and
return a "void __іomem *" from arch_ioremap, where:
- IS_ERR means return an error
- NULL means continue to remap
- a non-NULL, non-IS_ERR pointer is directly returned.
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next prev parent reply other threads:[~2022-04-28 15:47 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-27 12:14 [PATCH 0/4] arm64: Cleanup ioremap() and support ioremap_prot() Kefeng Wang
2022-04-27 12:14 ` [PATCH 1/4] mm: ioremap: Setup phys_addr of struct vm_struct Kefeng Wang
2022-04-27 17:10 ` Andrew Morton
2022-04-28 1:40 ` Kefeng Wang
2022-04-28 15:41 ` Christoph Hellwig
2022-04-27 12:14 ` [PATCH 2/4] mm: ioremap: Add arch_ioremap/iounmap_check() Kefeng Wang
2022-04-27 17:04 ` Andrew Morton
2022-04-28 6:16 ` Kefeng Wang
2022-04-28 15:46 ` Christoph Hellwig [this message]
2022-04-27 18:20 ` Arnd Bergmann
2022-04-27 18:25 ` Andrew Morton
2022-04-27 20:46 ` Arnd Bergmann
2022-04-28 6:20 ` Kefeng Wang
2022-04-28 6:47 ` Arnd Bergmann
2022-04-27 12:14 ` [PATCH 3/4] arm64: mm: Convert to GENERIC_IOREMAP Kefeng Wang
2022-04-27 17:11 ` Andrew Morton
2022-04-27 12:14 ` [PATCH 4/4] arm64: Add HAVE_IOREMAP_PROT support Kefeng Wang
2022-04-28 10:46 ` [PATCH 0/4] arm64: Cleanup ioremap() and support ioremap_prot() Will Deacon
2022-04-28 11:48 ` Kefeng Wang
2022-04-28 15:48 ` Christoph Hellwig
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