lkml.org 
[lkml]   [2017]   [May]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
SubjectRe: [PATCH] s390: provide default ioremap and iounmap declaration
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@deltatee.com>
> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
> Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
> Cc: Al Viro <viro@ZenIV.linux.org.uk>
> ---
>
> 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
\
 
 \ /
  Last update: 2017-05-26 14:38    [W:0.076 / U:0.768 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site