linux-kernel - Re: [PATCH v2] PCI: rcar-host: Add OF Kconfig dependency to avoid objtool no-cfi warning

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Message-ID: <20251226234651.GA4148926@bhelgaas>
Date: Fri, 26 Dec 2025 17:46:51 -0600
From: Bjorn Helgaas <helgaas@...nel.org>
To: Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>
Cc: Marek Vasut <marek.vasut+renesas@...il.com>,
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kwilczynski@...nel.org>,
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Nathan Chancellor <nathan@...nel.org>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Magnus Damm <magnus.damm@...il.com>, Kees Cook <kees@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>, linux-pci@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	llvm@...ts.linux.dev, kernel test robot <lkp@...el.com>
Subject: Re: [PATCH v2] PCI: rcar-host: Add OF Kconfig dependency to avoid
 objtool no-cfi warning

On Thu, Dec 18, 2025 at 10:53:00AM +0530, Manivannan Sadhasivam wrote:
> On Tue, 14 Oct 2025 11:20:27 -0700, Nathan Chancellor wrote:
> > After commit 894af4a1cde6 ("objtool: Validate kCFI calls"), compile
> > testing pcie-rcar-host.c with CONFIG_FINEIBT=y and CONFIG_OF=n results
> > in a no-cfi objtool warning in rcar_pcie_probe():
> > 
> >   $ cat allno.config
> >   CONFIG_CFI=y
> >   CONFIG_COMPILE_TEST=y
> >   CONFIG_CPU_MITIGATIONS=y
> >   CONFIG_GENERIC_PHY=y
> >   CONFIG_MITIGATION_RETPOLINE=y
> >   CONFIG_MODULES=y
> >   CONFIG_PCI=y
> >   CONFIG_PCI_MSI=y
> >   CONFIG_PCIE_RCAR_HOST=y
> >   CONFIG_X86_KERNEL_IBT=y
> > 
> > [...]
> 
> Applied, thanks!
> 
> [1/1] PCI: rcar-host: Add OF Kconfig dependency to avoid objtool no-cfi warning
>       commit: 57833f84f6f5967134c9c1119289f7acdd1c93e9

Is this v6.19 material?  The patch is old, 894af4a1cde6 appeared in
v6.18, and it's not really a regression, but it only affects
PCIE_RCAR_HOST and it looks like it papers over a headache for static
analysis.

Bjorn