Return-path: Received: from 9pmail.ess.barracuda.com ([64.235.154.210]:48222 "EHLO 9pmail.ess.barracuda.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750852AbeAOLST (ORCPT ); Mon, 15 Jan 2018 06:18:19 -0500 Subject: Re: [PATCH] bcma: Prevent build of PCI host features in module To: Kalle Valo CC: =?UTF-8?B?UmFmYcWCIE1pxYJlY2tp?= , , , "Guenter Roeck" , Linux MIPS Mailing List References: <1515767119-17117-1-git-send-email-matt.redfearn@mips.com> <87zi5f1lm0.fsf@purkki.adurom.net> From: Matt Redfearn Message-ID: <85b96369-ebd6-1f04-13c2-1757ac716723@mips.com> (sfid-20180115_121837_612925_09125BFA) Date: Mon, 15 Jan 2018 11:16:57 +0000 MIME-Version: 1.0 In-Reply-To: <87zi5f1lm0.fsf@purkki.adurom.net> Content-Type: text/plain; charset="utf-8"; format=flowed Sender: linux-wireless-owner@vger.kernel.org List-ID: Hi Kalle, On 15/01/18 10:07, Kalle Valo wrote: > Matt Redfearn writes: > >> Attempting to build bcma.ko with BCMA_DRIVER_PCI_HOSTMODE=y results in >> a build error due to use of symbols not exported from vmlinux: >> >> ERROR: "pcibios_enable_device" [drivers/bcma/bcma.ko] undefined! >> ERROR: "register_pci_controller" [drivers/bcma/bcma.ko] undefined! >> make[1]: *** [scripts/Makefile.modpost:92: __modpost] Error 1 >> >> To prevent this, don't allow the host mode feature to be built if >> CONFIG_BCMA=m >> >> Signed-off-by: Matt Redfearn >> >> --- >> >> drivers/bcma/Kconfig | 2 +- >> 1 file changed, 1 insertion(+), 1 deletion(-) >> >> diff --git a/drivers/bcma/Kconfig b/drivers/bcma/Kconfig >> index 02d78f6cecbb..4294784b9cf1 100644 >> --- a/drivers/bcma/Kconfig >> +++ b/drivers/bcma/Kconfig >> @@ -55,7 +55,7 @@ config BCMA_DRIVER_PCI >> >> config BCMA_DRIVER_PCI_HOSTMODE >> bool "Driver for PCI core working in hostmode" >> - depends on MIPS && BCMA_DRIVER_PCI >> + depends on MIPS && BCMA_DRIVER_PCI && BCMA = y > > Is this a new regression? Do you know the commit which broke this? As far as I can see, pcibios_enable_device and register_pci_controller have never being exported symbols from vmlinux, and an allmodconfig build with CONFIG_MIPS_COBALT=y (MIPS cobalt platform) which attempts to put this this functionality into a module would never have linked successfully. As such it can be traced back to when this functionality was added, 49dc9577155576b10ff79f0c1486c816b01f58bf ("bcma: add PCIe host controller"). > > Is it somehow related to this: > > bcma: Fix 'allmodconfig' and BCMA builds on MIPS targets > https://patchwork.kernel.org/patch/10162839/ > > Or are these two separate issues? > Separate issues - that one fixes allmodconfig when CONFIG_MIPS_GENERIC=y (MIPS generic platform) which does not define the struct pci_controller - that error was really introduced when that struct definition was removed for the generic platform by c5611df968047fb0b38156497b4242730ef66108 ("MIPS: PCI: Introduce CONFIG_PCI_DRIVERS_LEGACY"). I think both patches are valid since they fix errors building allmodconfig on 2 separate MIPS platforms. Thanks, Matt