On Thu, May 25, 2017 at 09:43:48AM -0600, Logan Gunthorpe wrote:
> Add a default ioremap function which was not provided in all
> circumstances. (Only when CONFIG_PCI was set).
>
> I have designs to use them in scatterlist.c where they'd likely never
> be called without CONFIG_PCI set, but it is needed to compile. Thus,
> if the function is ever hit it returns NULL.
>
> Signed-off-by: Logan Gunthorpe <logang@xxxxxxxxxxxx>
> Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
> Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
> Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
> ---
>
> Thanks to Al Viro for pointing out this corner case in s390.
>
> arch/s390/include/asm/io.h | 11 +++++++++++
> 1 file changed, 11 insertions(+)
>
> diff --git a/arch/s390/include/asm/io.h b/arch/s390/include/asm/io.h
> index 437e9af..f4140d4 100644
> --- a/arch/s390/include/asm/io.h
> +++ b/arch/s390/include/asm/io.h
> @@ -73,6 +73,17 @@ static inline void ioport_unmap(void __iomem *p)
> #define __raw_writel zpci_write_u32
> #define __raw_writeq zpci_write_u64
>
> +#else
> +
> +static inline void __iomem *ioremap(unsigned long offset, unsigned long size)
> +{
> + return NULL;
> +}
> +
> +static inline void iounmap(void __iomem *addr)
> +{
> +}
> +
> #endif /* CONFIG_PCI */
I'd rather move the #ifdef CONFIG_PCI than implementing this yet another
time (see patch below). But I'll leave that up to Sebastian.
diff --git a/arch/s390/include/asm/io.h b/arch/s390/include/asm/io.h
index 437e9af96688..904e4b3af95d 100644
--- a/arch/s390/include/asm/io.h
+++ b/arch/s390/include/asm/io.h
@@ -25,8 +25,6 @@ void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr);
#define IO_SPACE_LIMIT 0
-#ifdef CONFIG_PCI
-
#define ioremap_nocache(addr, size) ioremap(addr, size)
#define ioremap_wc ioremap_nocache
#define ioremap_wt ioremap_nocache
@@ -49,6 +47,8 @@ static inline void ioport_unmap(void __iomem *p)
{
}
+#ifdef CONFIG_PCI
+
/*
* s390 needs a private implementation of pci_iomap since ioremap with its
* offset parameter isn't sufficient. That's because BAR spaces are not
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