linux-kernel - Re: [PATCH v3 1/7] swiotlb: make io_tlb_default

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Message-ID: <2023062745-routing-palace-d0b4@gregkh>
Date:   Tue, 27 Jun 2023 12:24:24 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Petr Tesarik <petrtesarik@...weicloud.com>
Cc:     Stefano Stabellini <sstabellini@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Juergen Gross <jgross@...e.com>,
        Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
        Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Kees Cook <keescook@...omium.org>,
        Saravana Kannan <saravanak@...gle.com>,
        "moderated list:XEN HYPERVISOR ARM" <xen-devel@...ts.xenproject.org>,
        "moderated list:ARM PORT" <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:MIPS" <linux-mips@...r.kernel.org>,
        "open list:XEN SWIOTLB SUBSYSTEM" <iommu@...ts.linux.dev>,
        Roberto Sassu <roberto.sassu@...weicloud.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>, petr@...arici.cz
Subject: Re: [PATCH v3 1/7] swiotlb: make io_tlb_default_mem local to
 swiotlb.c

On Tue, Jun 27, 2023 at 11:54:23AM +0200, Petr Tesarik wrote:
> +/**
> + * is_swiotlb_active() - check if the software IO TLB is initialized
> + * @dev:	Device to check, or %NULL for the default IO TLB.
> + */
>  bool is_swiotlb_active(struct device *dev)
>  {
> -	struct io_tlb_mem *mem = dev->dma_io_tlb_mem;
> +	struct io_tlb_mem *mem = dev
> +		? dev->dma_io_tlb_mem
> +		: &io_tlb_default_mem;

That's impossible to read and maintain over time, sorry.

Please use real "if () else" lines, so that it can be maintained over
time.

thanks,

greg k-h