linux-kernel - Re: Build failures in -next due to 'linux/io.h: Add pci_remap

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Date:   Mon, 24 Apr 2017 09:56:44 +0100
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>, Arnd Bergmann <arnd@...db.de>,
        Will Deacon <will.deacon@....com>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        linux-kernel@...r.kernel.org
Subject: Re: Build failures in -next due to 'linux/io.h: Add
 pci_remap_cfgspace() interface'

On Sun, Apr 23, 2017 at 05:10:55PM -0700, Guenter Roeck wrote:
> Hi,
> 
> -next fails to build for several architectures due to commit 'linux/io.h: Add
> pci_remap_cfgspace() interface'. Error message is
> 
> include/linux/io.h: In function ‘pci_remap_cfgspace’:
> include/linux/io.h:108:9: error: implicit declaration of function ‘ioremap_nocache’
> 
> Affected architectures (not necessarily a complete list):
> 
> um
> score
> s390
> 
> Bisect results for s390 and score are below. I did not bother to bisect
> the um build; the error message is the same.

Sorry about that, kbuild did not catch those. Patch below should fix it
(tested it on um/s390); either I do that or I will have to remove the
static inline and make it a:

#define pci_remap_cfgspace ioremap_nocache

It is nice to see how consistent the ioremap interface is across arches :)

Bjorn please let me know how you prefer fixing it, I will post a patch
accordingly.

Lorenzo

-- >8 --
diff --git a/include/linux/io.h b/include/linux/io.h
index 3934aba..2195d9e 100644
--- a/include/linux/io.h
+++ b/include/linux/io.h
@@ -90,6 +90,7 @@ void *devm_memremap(struct device *dev, resource_size_t offset,
 
 void *__devm_memremap_pages(struct device *dev, struct resource *res);
 
+#ifdef CONFIG_PCI
 /*
  * The PCI specifications (Rev 3.0, 3.2.5 "Transaction Ordering and
  * Posting") mandate non-posted configuration transactions. There is
@@ -108,6 +109,7 @@ static inline void __iomem *pci_remap_cfgspace(phys_addr_t offset,
 	return ioremap_nocache(offset, size);
 }
 #endif
+#endif
 
 /*
  * Some systems do not have legacy ISA devices.