linux-kernel - Re: build failure of next-20220718 due to 'imx6_pcie_host

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Message-ID: <20220718161439.GA1419930@bhelgaas>
Date:   Mon, 18 Jul 2022 11:14:39 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     "Sudip Mukherjee (Codethink)" <sudipm.mukherjee@...il.com>,
        Richard Zhu <hongxing.zhu@....com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        linux-pci <linux-pci@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: build failure of next-20220718 due to 'imx6_pcie_host_exit'
 defined but not used

On Mon, Jul 18, 2022 at 02:42:16PM +0200, Arnd Bergmann wrote:
> On Mon, Jul 18, 2022 at 1:58 PM Sudip Mukherjee (Codethink)
> <sudipm.mukherjee@...il.com> wrote:
> >
> > Hi All,
> >
> > Not sure if it has been reported, builds of alpha, csky, xtensa, riscv, s390 allmodsconfig
> > have failed to build next-20220718 with the error:
> >
> >
> > drivers/pci/controller/dwc/pci-imx6.c:973:13: error: 'imx6_pcie_host_exit' defined but not used [-Werror=unused-function]
> >   973 | static void imx6_pcie_host_exit(struct dw_pcie_rp *pp)
> >       |             ^~~~~~~~~~~~~~~~~~~
> > drivers/pci/controller/dwc/pci-imx6.c:904:13: error: 'imx6_pcie_stop_link' defined but not used [-Werror=unused-function]
> >   904 | static void imx6_pcie_stop_link(struct dw_pcie *pci)
> >       |             ^~~~~~~~~~~~~~~~~~~
> >
> 
> These are called from inside an "#ifdef CONFIG_PM_SLEEP" section. The best
> fix is to remove the #ifdef and replace SET_NOIRQ_SYSTEM_SLEEP_PM_OPS()
> with the new simpler NOIRQ_SYSTEM_SLEEP_PM_OPS().

Might be simpler, but wow, it's hard to keep up with all the
permutations of sleep ops ;)

Unfortunately 1a3c7bb08826 ("PM: core: Add new *_PM_OPS macros,
deprecate old ones"), which added NOIRQ_SYSTEM_SLEEP_PM_OPS, didn't
add any hints near SET_NOIRQ_SYSTEM_SLEEP_PM_OPS.

We have several PCI controller drivers that use the "#ifdef
CONFIG_PM_SLEEP" and SET_NOIRQ_SYSTEM_SLEEP_PM_OPS pattern or the
"__maybe_unused" + SET_NOIRQ_SYSTEM_SLEEP_PM_OPS pattern.  I guess we
need to look at all of them and figure out the best practice.

Bjorn