linux-kernel - [PATCH] asm-generic: Support NO_IOPORT_MAP in pci

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Message-Id: <20220722212248.802500-1-shorne@gmail.com>
Date:   Sat, 23 Jul 2022 06:22:48 +0900
From:   Stafford Horne <shorne@...il.com>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Stafford Horne <shorne@...il.com>, Arnd Bergmann <arnd@...db.de>,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        linux-arch@...r.kernel.org
Subject: [PATCH] asm-generic: Support NO_IOPORT_MAP in pci_iomap.h

When building OpenRISC PCI which has no ioport_map we get the following build
error.

    lib/pci_iomap.c: In function 'pci_iomap_range':
      CC      drivers/i2c/i2c-core-base.o
    ./include/asm-generic/pci_iomap.h:29:41: error: implicit declaration of function 'ioport_map'; did you mean 'ioremap'? [-Werror=implicit-function-declaration]
       29 | #define __pci_ioport_map(dev, port, nr) ioport_map((port), (nr))
          |                                         ^~~~~~~~~~
    lib/pci_iomap.c:44:24: note: in expansion of macro '__pci_ioport_map'
       44 |                 return __pci_ioport_map(dev, start, len);
          |                        ^~~~~~~~~~~~~~~~

This patch adds a NULL definition of __pci_ioport_map for architetures
which do not support ioport_map.

Suggested-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Stafford Horne <shorne@...il.com>
---
The Kconfig I am using to test this is here:
  https://github.com/stffrdhrn/linux/commits/or1k-virt-4

 include/asm-generic/pci_iomap.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/asm-generic/pci_iomap.h b/include/asm-generic/pci_iomap.h
index 5a2f9bf53384..8fbb0a55545d 100644
--- a/include/asm-generic/pci_iomap.h
+++ b/include/asm-generic/pci_iomap.h
@@ -25,6 +25,8 @@ extern void pci_iounmap(struct pci_dev *dev, void __iomem *);
 #ifdef CONFIG_NO_GENERIC_PCI_IOPORT_MAP
 extern void __iomem *__pci_ioport_map(struct pci_dev *dev, unsigned long port,
 				      unsigned int nr);
+#elif !defined(CONFIG_HAS_IOPORT_MAP)
+#define __pci_ioport_map(dev, port, nr) NULL
 #else
 #define __pci_ioport_map(dev, port, nr) ioport_map((port), (nr))
 #endif
-- 
2.36.1