linux-kernel - Re: [PATCH 5/6] mips: drop GENERIC

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Message-ID: <20250319173010.GA84652@ax162>
Date: Wed, 19 Mar 2025 10:30:10 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: Arnd Bergmann <arnd@...db.de>
Cc: Arnd Bergmann <arnd@...nel.org>,
	Linux-Arch <linux-arch@...r.kernel.org>,
	Richard Henderson <richard.henderson@...aro.org>,
	Matt Turner <mattst88@...il.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Greg Ungerer <gerg@...ux-m68k.org>,
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	"James E . J . Bottomley" <James.Bottomley@...senpartnership.com>,
	Helge Deller <deller@....de>,
	Madhavan Srinivasan <maddy@...ux.ibm.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Nicholas Piggin <npiggin@...il.com>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Naveen N Rao <naveen@...nel.org>,
	Yoshinori Sato <ysato@...rs.sourceforge.jp>,
	Rich Felker <dalias@...c.org>,
	John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
	Julian Vetter <julian@...er-limits.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>, linux-alpha@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
	linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, linux-sh@...r.kernel.org
Subject: Re: [PATCH 5/6] mips: drop GENERIC_IOMAP wrapper

On Tue, Mar 18, 2025 at 10:13:35PM +0100, Arnd Bergmann wrote:
> Thanks for the report, I missed that the generic ioport_map() function
> is missing the PCI_IOBASE macro, we should probably remove that from
> the asm-generic/io.h header and require architectures to define it
> themselves, since the NULL fallback is pretty much always wrong.
> 
> There is also a type mismatch between the MIPS
> PCI_IOBASE/mips_io_port_base and the one that asm-generic/io.h
> expects, so I had to add a couple of extra typecasts, which
> makes it rather ugly, but the change below seems to work.

Thanks, that does make the -Wnull-pointer-arithmetic warnings disappear.
That build still fails in next-20250319 (which includes that change) at
the end with:

  $ make -skj"$(nproc)" ARCH=mips CROSS_COMPILE=mips-linux- mrproper malta_defconfig all
  ERROR: modpost: "pci_iounmap" [drivers/net/wireless/intel/ipw2x00/ipw2100.ko] undefined!

which appears related to this original change.

Cheers,
Nathan