linux-kernel - [PATCH v2 2/4] PCI: only build xen-pcifront in PV-enabled environments

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Date:   Fri, 17 Sep 2021 12:48:03 +0200
From:   Jan Beulich <jbeulich@...e.com>
To:     "bhelgaas@...gle.com" <bhelgaas@...gle.com>
Cc:     Stefano Stabellini <sstabellini@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        "xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>,
        "hch@....de" <hch@....de>, Konrad Wilk <konrad.wilk@...cle.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Subject: [PATCH v2 2/4] PCI: only build xen-pcifront in PV-enabled
 environments

The driver's module init function, pcifront_init(), invokes
xen_pv_domain() first thing. That construct produces constant "false"
when !CONFIG_XEN_PV. Hence there's no point building the driver in
non-PV configurations.

Drop the (now implicit and generally wrong) X86 dependency: At present,
XEN_PV con only be set when X86 is also enabled. In general an
architecture supporting Xen PV (and PCI) would want to have this driver
built.

Signed-off-by: Jan Beulich <jbeulich@...e.com>
Reviewed-by: Stefano Stabellini <sstabellini@...nel.org>
---
v2: Title and description redone.

--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -110,7 +110,7 @@ config PCI_PF_STUB
 
 config XEN_PCIDEV_FRONTEND
 	tristate "Xen PCI Frontend"
-	depends on X86 && XEN
+	depends on XEN_PV
 	select PCI_XEN
 	select XEN_XENBUS_FRONTEND
 	default y