linux-kernel - RE: [PATCH] asm-generic/io.h: Silence -Wnull-pointer-arithmetic warning on PCI

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Message-ID: <11ead5c2c73c42cbbeef32966bc7e5c2@AcuMS.aculab.com>
Date:   Tue, 13 Apr 2021 13:06:49 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Arnd Bergmann' <arnd@...db.de>,
        Niklas Schnelle <schnelle@...ux.ibm.com>
CC:     Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        linux-arch <linux-arch@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-s390 <linux-s390@...r.kernel.org>
Subject: RE: [PATCH] asm-generic/io.h: Silence -Wnull-pointer-arithmetic
 warning on PCI_IOBASE

From: Arnd Bergmann
> Sent: 13 April 2021 13:58
...
> The remaining ones (csky, m68k, sparc32) need to be inspected
> manually to see if they currently support PCI I/O space but in
> fact use address zero as the base (with large resources) or they
> should also turn the operations into a NOP.

I'd expect sparc32 to use an ASI to access PCI IO space.
I can't quite remember whether IO space was supported at all.

	David

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