From: Arnd Bergmann <arnd@arndb.de>
To: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux-MM <linux-mm@kvack.org>,
Christoph Hellwig <hch@infradead.org>,
Arnd Bergmann <arnd@arndb.de>,
Anshuman Khandual <anshuman.khandual@arm.com>
Subject: Re: [PATCH v3 4/6] mm: ioremap: Add arch_ioremap/iounmap()
Date: Tue, 24 May 2022 14:37:40 +0200 [thread overview]
Message-ID: <CAK8P3a1DbNY6NzcwzjVFvd9yw6L3YBHQos_hmE=nG=6cuv1DAg@mail.gmail.com> (raw)
In-Reply-To: <20220519082552.117736-5-wangkefeng.wang@huawei.com>
On Thu, May 19, 2022 at 10:25 AM Kefeng Wang <wangkefeng.wang@huawei.com> wrote:
>
> Add special hook for architecture to verify or setup addr, size
> or prot when ioremap() or iounmap(), which will make the generic
> ioremap more useful.
>
> arch_ioremap() return a pointer,
> - IS_ERR means return an error
> - NULL means continue to remap
> - a non-NULL, non-IS_ERR pointer is directly returned
> arch_iounmap() return a int value,
> - 0 means continue to vunmap
> - error code means skip vunmap and return directly
>
> Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
I don't really like interfaces that mix error pointers and NULL pointer
returns.
Would it be possible to have a special error code other than NULL
for the fallback case?
arnd
WARNING: multiple messages have this Message-ID (diff)
From: Arnd Bergmann <arnd@arndb.de>
To: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux-MM <linux-mm@kvack.org>,
Christoph Hellwig <hch@infradead.org>,
Arnd Bergmann <arnd@arndb.de>,
Anshuman Khandual <anshuman.khandual@arm.com>
Subject: Re: [PATCH v3 4/6] mm: ioremap: Add arch_ioremap/iounmap()
Date: Tue, 24 May 2022 14:37:40 +0200 [thread overview]
Message-ID: <CAK8P3a1DbNY6NzcwzjVFvd9yw6L3YBHQos_hmE=nG=6cuv1DAg@mail.gmail.com> (raw)
In-Reply-To: <20220519082552.117736-5-wangkefeng.wang@huawei.com>
On Thu, May 19, 2022 at 10:25 AM Kefeng Wang <wangkefeng.wang@huawei.com> wrote:
>
> Add special hook for architecture to verify or setup addr, size
> or prot when ioremap() or iounmap(), which will make the generic
> ioremap more useful.
>
> arch_ioremap() return a pointer,
> - IS_ERR means return an error
> - NULL means continue to remap
> - a non-NULL, non-IS_ERR pointer is directly returned
> arch_iounmap() return a int value,
> - 0 means continue to vunmap
> - error code means skip vunmap and return directly
>
> Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
I don't really like interfaces that mix error pointers and NULL pointer
returns.
Would it be possible to have a special error code other than NULL
for the fallback case?
arnd
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http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2022-05-24 12:38 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-19 8:25 [PATCH v3 0/6] arm64: Cleanup ioremap() and support ioremap_prot() Kefeng Wang
2022-05-19 8:25 ` Kefeng Wang
2022-05-19 8:25 ` [PATCH v3 1/6] ARM: mm: kill unused runtime hook arch_iounmap() Kefeng Wang
2022-05-19 8:25 ` Kefeng Wang
2022-05-19 8:51 ` Anshuman Khandual
2022-05-19 8:51 ` Anshuman Khandual
2022-05-20 15:28 ` Catalin Marinas
2022-05-20 15:28 ` Catalin Marinas
2022-05-24 2:03 ` Kefeng Wang
2022-05-24 2:03 ` Kefeng Wang
2022-05-21 20:30 ` Arnd Bergmann
2022-05-21 20:30 ` Arnd Bergmann
2022-05-19 8:25 ` [PATCH v3 2/6] mm: ioremap: Use more sensibly name in ioremap_prot() Kefeng Wang
2022-05-19 8:25 ` Kefeng Wang
2022-05-19 8:25 ` [PATCH v3 3/6] mm: ioremap: Setup phys_addr of struct vm_struct Kefeng Wang
2022-05-19 8:25 ` Kefeng Wang
2022-05-19 8:25 ` [PATCH v3 4/6] mm: ioremap: Add arch_ioremap/iounmap() Kefeng Wang
2022-05-19 8:25 ` Kefeng Wang
2022-05-19 18:52 ` Andrew Morton
2022-05-19 18:52 ` Andrew Morton
2022-05-20 1:22 ` Kefeng Wang
2022-05-20 1:22 ` Kefeng Wang
2022-05-23 3:57 ` Anshuman Khandual
2022-05-23 3:57 ` Anshuman Khandual
2022-05-23 22:17 ` kernel test robot
2022-05-23 22:17 ` kernel test robot
2022-05-24 9:48 ` Kefeng Wang
2022-05-24 9:48 ` Kefeng Wang
2022-05-24 9:48 ` Kefeng Wang
2022-05-24 12:35 ` Arnd Bergmann
2022-05-24 12:35 ` Arnd Bergmann
2022-05-24 12:35 ` Arnd Bergmann
2022-05-24 14:31 ` Kefeng Wang
2022-05-24 14:31 ` Kefeng Wang
2022-05-24 14:31 ` Kefeng Wang
2022-05-24 12:37 ` Arnd Bergmann [this message]
2022-05-24 12:37 ` Arnd Bergmann
2022-05-24 14:32 ` Kefeng Wang
2022-05-24 14:32 ` Kefeng Wang
2022-05-24 14:47 ` Arnd Bergmann
2022-05-24 14:47 ` Arnd Bergmann
2022-05-24 14:53 ` Kefeng Wang
2022-05-24 14:53 ` Kefeng Wang
2022-05-31 6:13 ` Christoph Hellwig
2022-05-31 6:13 ` Christoph Hellwig
2022-06-01 1:05 ` Kefeng Wang
2022-06-01 1:05 ` Kefeng Wang
2022-05-19 8:25 ` [PATCH v3 5/6] arm64: mm: Convert to GENERIC_IOREMAP Kefeng Wang
2022-05-19 8:25 ` Kefeng Wang
2022-05-19 8:25 ` [PATCH v3 6/6] arm64: Add HAVE_IOREMAP_PROT support Kefeng Wang
2022-05-19 8:25 ` Kefeng Wang
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