next-20091007 - comedi driver build breaks on S390x
schwidefsky at de.ibm.com
Wed Oct 7 08:34:15 PDT 2009
On Wed, 7 Oct 2009 06:07:44 -0700
Greg KH <gregkh at suse.de> wrote:
> On Wed, Oct 07, 2009 at 04:24:58PM +0530, Kamalesh Babulal wrote:
> > Hi Greg,
> > next-20091007 randconfig build breaks on s390x with build error
> > drivers/staging/comedi/comedi_fops.c: In function 'comedi_mmap':
> > drivers/staging/comedi/comedi_fops.c:1453: error: 'PAGE_SHARED' undeclared (first use in this function)
> > drivers/staging/comedi/comedi_fops.c:1453: error: (Each undeclared identifier is reported only once
> > drivers/staging/comedi/comedi_fops.c:1453: error: for each function it appears in.)
> > make: *** [drivers/staging/comedi/comedi_fops.o] Error 1
> Odd. What changed in the header files to cause this?
The problem has always been present, only now did randconfig find it.
The compile breaks because PAGE_SHARED is not defined for s390. The
equivalent define for s390 is PAGE_RW. The problem has not shown up so
far because all drivers who use the remap_pfn_range call with
PAGE_SHARED has dependencies not available on s390, e.g. CONFIG_PCI.
To fix this I see are two options: 1) add a PAGE_SHARED define to
arch/s390/include/asm/pgtable.h, 2) make comedi depend on !S390.
"Reality continues to ruin my life." - Calvin.
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