linux-kernel - Re: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared

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Message-ID: <CAPcyv4g8VjbMaVnXXyWVh8tXNakO9FmDXfANJmPmgvDfZX-OBA@mail.gmail.com>
Date:   Tue, 12 Oct 2021 12:13:13 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     "Reshetova, Elena" <elena.reshetova@...el.com>
Cc:     Andi Kleen <ak@...ux.intel.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Peter Zijlstra <peterz@...radead.org>,
        "Lutomirski, Andy" <luto@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Richard Henderson <rth@...ddle.net>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        James E J Bottomley <James.Bottomley@...senpartnership.com>,
        Helge Deller <deller@....de>,
        "David S . Miller" <davem@...emloft.net>,
        Arnd Bergmann <arnd@...db.de>,
        Jonathan Corbet <corbet@....net>,
        Paolo Bonzini <pbonzini@...hat.com>,
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        Josh Poimboeuf <jpoimboe@...hat.com>,
        Peter H Anvin <hpa@...or.com>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        "Luck, Tony" <tony.luck@...el.com>,
        Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Kuppuswamy Sathyanarayanan <knsathya@...nel.org>,
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        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
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        Linux Doc Mailing List <linux-doc@...r.kernel.org>,
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Subject: Re: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(), pci_iomap_host_shared_range()

On Tue, Oct 12, 2021 at 11:57 AM Reshetova, Elena
<elena.reshetova@...el.com> wrote:
>
>
> > I suspect the true number is even higher because that doesn't include IO
> > inside calls to other modules and indirect pointers, correct?
>
> Actually everything should be included. Smatch has cross-function db and
> I am using it for getting the call chains and it follows function pointers.
> Also since I am starting from a list of individual read IOs, every single
> base read IO in drivers/* should be covered as far as I can see. But if it uses
> some weird IO wrappers then the actual list might be higher.

Why analyze individual IO calls? I thought the goal here was to
disable entire classes of ioremap() users?