linux-kernel - [PATCH v4 03/16] PCI/ATS: Restore EXPORT_SYMBOL_GPL() for pci_{enable,disable}

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Date:   Thu, 19 Dec 2019 12:03:39 +0000
From:   Will Deacon <will@...nel.org>
To:     linux-kernel@...r.kernel.org, iommu@...ts.linuxfoundation.org
Cc:     kernel-team@...roid.com, Will Deacon <will@...nel.org>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Jordan Crouse <jcrouse@...eaurora.org>,
        John Garry <john.garry@...wei.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Saravana Kannan <saravanak@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Isaac J. Manjarres" <isaacm@...eaurora.org>,
        Robin Murphy <robin.murphy@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Joerg Roedel <joro@...tes.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        Greg Kroah-Hartman <gregkh@...gle.com>,
        Joerg Roedel <jroedel@...e.de>
Subject: [PATCH v4 03/16] PCI/ATS: Restore EXPORT_SYMBOL_GPL() for pci_{enable,disable}_ats()

From: Greg Kroah-Hartman <gregkh@...gle.com>

Commit d355bb209783 ("PCI/ATS: Remove unnecessary EXPORT_SYMBOL_GPL()")
unexported a bunch of symbols from the PCI core since the only external
users were non-modular IOMMU drivers. Although most of those symbols
can remain private for now, 'pci_{enable,disable_ats()' is required for
the ARM SMMUv3 driver to build as a module, otherwise we get a build
failure as follows:

  | ERROR: "pci_enable_ats" [drivers/iommu/arm-smmu-v3.ko] undefined!
  | ERROR: "pci_disable_ats" [drivers/iommu/arm-smmu-v3.ko] undefined!

Re-export these two functions so that the ARM SMMUv3 driver can be build
as a module.

Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: Joerg Roedel <jroedel@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...gle.com>
[will: rewrote commit message]
Signed-off-by: Will Deacon <will@...nel.org>
---
 drivers/pci/ats.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/pci/ats.c b/drivers/pci/ats.c
index 982b46f0a54d..dcbcf1331bb2 100644
--- a/drivers/pci/ats.c
+++ b/drivers/pci/ats.c
@@ -69,6 +69,7 @@ int pci_enable_ats(struct pci_dev *dev, int ps)
 	dev->ats_enabled = 1;
 	return 0;
 }
+EXPORT_SYMBOL_GPL(pci_enable_ats);
 
 /**
  * pci_disable_ats - disable the ATS capability
@@ -87,6 +88,7 @@ void pci_disable_ats(struct pci_dev *dev)
 
 	dev->ats_enabled = 0;
 }
+EXPORT_SYMBOL_GPL(pci_disable_ats);
 
 void pci_restore_ats_state(struct pci_dev *dev)
 {
-- 
2.24.1.735.g03f4e72817-goog