linux-kernel - Re: [PATCH v5 00/44] treewide: Remove I/O port accessors for HAS

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Date:   Wed,  7 Jun 2023 21:42:21 -0400
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     Arnd Bergmann <arnd@...db.de>,
        Richard Cochran <richardcochran@...il.com>,
        Niklas Schnelle <schnelle@...ux.ibm.com>
Cc:     "Martin K . Petersen" <martin.petersen@...cle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Alan Stern <stern@...land.harvard.edu>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-pci@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v5 00/44] treewide: Remove I/O port accessors for HAS_IOPORT=n

On Mon, 22 May 2023 12:50:05 +0200, Niklas Schnelle wrote:

> Some platforms such as s390 do not support PCI I/O spaces. On such platforms
> I/O space accessors like inb()/outb() are stubs that can never actually work.
> The way these stubs are implemented in asm-generic/io.h leads to compiler
> warnings because any use will be a NULL pointer access on these platforms. In
> a previous patch we tried handling this with a run-time warning on access. This
> approach however was rejected by Linus[0] with the argument that this really
> should be a compile-time check and, though a much more invasive change, we
> believe that is indeed the right approach.
> 
> [...]

Applied to 6.5/scsi-queue, thanks!

[21/44] mpt fusion: add HAS_IOPORT dependencies
        https://git.kernel.org/mkp/scsi/c/c3f903472ffa
[31/44] scsi: add HAS_IOPORT dependencies
        https://git.kernel.org/mkp/scsi/c/b58b2ba351b0

-- 
Martin K. Petersen	Oracle Linux Engineering