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Date:   Tue, 26 Apr 2022 20:40:07 +0200
From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     Jung Daehwan <dh10.jung@samsung.com>
Cc:     Mathias Nyman <mathias.nyman@intel.com>,
        "open list:USB XHCI DRIVER" <linux-usb@vger.kernel.org>,
        open list <linux-kernel@vger.kernel.org>,
        Howard Yen <howardyen@google.com>,
        Jack Pham <jackp@codeaurora.org>,
        Puma Hsu <pumahsu@google.com>,
        "J . Avila" <elavila@google.com>, sc.suh@samsung.com,
        Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Subject: Re: [PATCH v4 1/5] usb: host: export symbols for xhci-exynos to use
 xhci hooks
Message-ID: <Ymg8h6TiH4RpL93t@kroah.com>
References: <1650964728-175347-1-git-send-email-dh10.jung@samsung.com>
 <CGME20220426092021epcas2p4071f2b7621558a015579131990486a3c@epcas2p4.samsung.com>
 <1650964728-175347-2-git-send-email-dh10.jung@samsung.com>
 <YmfBSLDiZGkvu3sG@kroah.com>
 <20220426102709.GA175152@ubuntu>
 <YmfKBX2m+vOznq5h@kroah.com>
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On Tue, Apr 26, 2022 at 12:31:33PM +0200, Greg Kroah-Hartman wrote:
> On Tue, Apr 26, 2022 at 07:27:09PM +0900, Jung Daehwan wrote:
> > On Tue, Apr 26, 2022 at 11:54:16AM +0200, Greg Kroah-Hartman wrote:
> > > On Tue, Apr 26, 2022 at 06:18:44PM +0900, Daehwan Jung wrote:
> > > > Export symbols for xhci hooks usage:
> > > >     xhci_get_slot_ctx
> > > >     xhci_get_endpoint_address
> > > >     - Allow xhci hook to get ep_ctx from the xhci_container_ctx for
> > > >       getting the ep_ctx information to know which ep is offloading and
> > > >       comparing the context in remote subsystem memory if needed.
> > > > 
> > > >     xhci_ring_alloc
> > > >     - Allow xhci hook to allocate vendor specific ring. Vendors could
> > > >       alloc additional event ring.
> > > > 
> > > >     xhci_trb_virt_to_dma
> > > >     - Used to retrieve the DMA address of vendor specific ring. Vendors
> > > >       could get dequeue address of event ring.
> > > > 
> > > >     xhci_segment_free
> > > >     xhci_link_segments
> > > >     - Allow xhci hook to handle vendor specific segment. Vendors could
> > > >       directly free or link segments of vendor specific ring.
> > > > 
> > > >     xhci_initialize_ring_info
> > > >     - Allow xhci hook to initialize vendor specific ring.
> > > > 
> > > >     xhci_check_trb_in_td_math
> > > >     - Allow xhci hook to Check TRB math for validation. Vendors could
> > > >       check trb when allocating vendor specific ring.
> > > > 
> > > >     xhci_address_device
> > > >     - Allow override to give configuration info to Co-processor.
> > > > 
> > > >     xhci_bus_suspend
> > > >     xhci_bus_resume
> > > >     - Allow override of suspend and resume for power scenario.
> > > > 
> > > >     xhci_remove_stream_mapping
> > > >     - Allow to xhci hook to remove stream mapping. Vendors need to do it
> > > >       when free-ing vendor specific ring if it's stream type.
> > > > 
> > > 
> > > For the static functions that you are now exporting, they need to have
> > > their functions declared in a .h file.  If not, you now get warnings
> > > when you run sparse after applying this commit, right?
> > > 
> > > thanks,
> > > 
> > > greg k-h
> > > 
> > 
> > I didn't get warnings in my environment. I tested to build default config +
> > xhci_exynos by make command. Is there compile option to check it?
> 
> make "C=1"

And now 0-day reported it as well:
	https://lore.kernel.org/r/202204262306.mzMIKFKO-lkp@intel.com