linux-kernel - Re: [PATCH -next] PCI: endpoint: Fix Kconfig dependency

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Date:   Wed, 29 Jun 2022 11:51:19 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Bjorn Helgaas <helgaas@...nel.org>,
        Ren Zhijie <renzhijie2@...wei.com>,
        Jon Mason <jdmason@...zu.us>
Cc:     kishon@...com, lpieralisi@...nel.org, kw@...ux.com,
        bhelgaas@...gle.com, Frank.Li@....com, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] PCI: endpoint: Fix Kconfig dependency



On 6/27/22 13:25, Bjorn Helgaas wrote:
> On Mon, Jun 27, 2022 at 03:07:50PM -0500, Bjorn Helgaas wrote:
>> On Mon, Jun 27, 2022 at 02:57:14PM -0500, Bjorn Helgaas wrote:
>>> On Fri, Jun 24, 2022 at 09:19:11AM +0800, Ren Zhijie wrote:
>>>> If CONFIG_NTB is not set and CONFIG_PCI_EPF_VNTB is y.
>>>>
>>>> make ARCH=x86_64 CROSS_COMPILE=x86_64-linux-gnu-, will be failed, like this:
>>>>
>>>> drivers/pci/endpoint/functions/pci-epf-vntb.o: In function `epf_ntb_cmd_handler':
>>>> pci-epf-vntb.c:(.text+0x95e): undefined reference to `ntb_db_event'
>>>> pci-epf-vntb.c:(.text+0xa1f): undefined reference to `ntb_link_event'
>>>> pci-epf-vntb.c:(.text+0xa42): undefined reference to `ntb_link_event'
>>>> drivers/pci/endpoint/functions/pci-epf-vntb.o: In function `pci_vntb_probe':
>>>> pci-epf-vntb.c:(.text+0x1250): undefined reference to `ntb_register_device'
>>>>
>>>> The functions ntb_*() are defined in drivers/ntb/core.c, which need CONFIG_NTB setting y to be build-in.
>>>> To fix this build error, add depends on NTB.
>>>>
>>>> Reported-by: Hulk Robot <hulkci@...wei.com>
>>>> Fixes: ff32fac00d97("NTB: EPF: support NTB transfer between PCI RC and EP connection")
>>>> Signed-off-by: Ren Zhijie <renzhijie2@...wei.com>
>>>> Acked-by: Frank Li <frank.li@....com>
>>>
>>> Am I missing something? 
>>>
>>>   02:54:01 ~/linux (next)$ git checkout -b wip/ren-endpoint-ntb v5.19-rc1
>>>   Switched to a new branch 'wip/ren-endpoint-ntb'
>>>   02:54:23 ~/linux (wip/ren-endpoint-ntb)$ b4 am -om/ https://lore.kernel.org/r/20220624011911.164146-1-renzhijie2@huawei.com
>>>   02:54:47 ~/linux (wip/ren-endpoint-ntb)$ git am m/20220624_renzhijie2_pci_endpoint_fix_kconfig_dependency.mbx
>>>   Applying: PCI: endpoint: Fix Kconfig dependency
>>>   error: patch failed: drivers/pci/endpoint/functions/Kconfig:29
>>>
>>> Obviously I could fix this manually, but if there's something wrong
>>> with your patch posting process, we should fix it.
>>
>> Oh, I see the problem.  This patch depends on some other VNTB patch
>> that hasn't been merged yet.  That means this fix should be squashed
>> into the VNTB patch that adds "config PCI_EPF_VNTB".
> 
> Well, I saw *part* of the problem.  This fixes something that is in
> -next, added by ff32fac00d97 ("NTB: EPF: support NTB transfer between
> PCI RC and EP connection") [1], which was merged by Jon.
> 
> So I guess Jon will squash and update his branch or merge the
> fixup(s).
> 
> (Jon, if you squash, note there are several typos in the commit log:
> s/Virtual NTB/virtual NTB/, s/include/includes/, s/3 part/3 parts/,
> s/virutal/virtual, s/pci/PCI/, s/BUS/Bus/)
> 
> [1] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=ff32fac00d97
> 
>>>> ---
>>>> v2: Fix some commit message errors
>>>> ---
>>>>  drivers/pci/endpoint/functions/Kconfig | 1 +
>>>>  1 file changed, 1 insertion(+)
>>>>
>>>> diff --git a/drivers/pci/endpoint/functions/Kconfig b/drivers/pci/endpoint/functions/Kconfig
>>>> index 362555b024e8..9beee4f0f4ee 100644
>>>> --- a/drivers/pci/endpoint/functions/Kconfig
>>>> +++ b/drivers/pci/endpoint/functions/Kconfig
>>>> @@ -29,6 +29,7 @@ config PCI_EPF_NTB
>>>>  config PCI_EPF_VNTB
>>>>          tristate "PCI Endpoint NTB driver"
>>>>          depends on PCI_ENDPOINT
>>>> +        depends on NTB
>>>>          select CONFIGFS_FS
>>>>          help
>>>>            Select this configuration option to enable the Non-Transparent
>>>> -- 

Works for me. Thanks.

Acked-by: Randy Dunlap <rdunlap@...radead.org>
Tested-by: Randy Dunlap <rdunlap@...radead.org> # build-tested

maybe even
Reported-by: Randy Dunlap <rdunlap@...radead.org>
(see https://lore.kernel.org/linux-next/835b844b-9d9d-615c-af11-44154c2a8102@infradead.org/)

-- 
~Randy