linux-kernel - Re: [PATCH v5 37/44] usb: uhci: handle HAS

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Message-ID: <aa12b46b-22da-41c5-9748-0eea801dd423@rowland.harvard.edu>
Date:   Mon, 22 May 2023 09:57:36 -0400
From:   Alan Stern <stern@...land.harvard.edu>
To:     Niklas Schnelle <schnelle@...ux.ibm.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...nel.org>,
        linux-usb@...r.kernel.org
Subject: Re: [PATCH v5 37/44] usb: uhci: handle HAS_IOPORT dependencies

On Mon, May 22, 2023 at 12:50:42PM +0200, Niklas Schnelle wrote:
> In a future patch HAS_IOPORT=n will result in inb()/outb() and friends
> not being declared. We thus need to guard sections of code calling them
> as alternative access methods with CONFIG_HAS_IOPORT checks. For
> uhci-hcd there are a lot of I/O port uses that do have MMIO alternatives
> all selected by uhci_has_pci_registers() so this can be handled by
> UHCI_IN/OUT macros and making uhci_has_pci_registers() constant 0 if
> CONFIG_HAS_IOPORT is unset.
> 
> Co-developed-by: Arnd Bergmann <arnd@...nel.org>
> Signed-off-by: Arnd Bergmann <arnd@...nel.org>
> Signed-off-by: Niklas Schnelle <schnelle@...ux.ibm.com>
> ---

Reviewed-by: Alan Stern <stern@...land.harvard.edu>