On Fri, 13 Jul 2007, Arnd Bergmann wrote:
> On Friday 13 July 2007, James Bottomley wrote:
> > > IC.
> > >
> > > � - flush_kernel_dcache_page() is a no-op on ppc64
> > > � � (ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE is defined on parisc only).
> > >
> > > � - For reference, drivers/scsi/ipr.c (another ppc64 driver) just uses a plain
> > > � � kmap/memcpy/kunmap sequence
> > >
> > > So what should I do?
> >
> > Ask someone who knows the architecture ... Anton, Paulus or Benh ... I'm
> > fairly certain PPC is VIPT and will need some kind of alias
> > resolution ... perhaps its associative enough not to let the aliases be
> > a problem.
>
> I'm pretty sure that no ppc64 machine needs alias resolution in the kernel,
> although some are VIPT. Last time we discussed this, Segher explained it
> to me, but I don't remember which way Cell does it. IIRC, it automatically
> flushes cache lines that are accessed through aliases.
Thanks for confirming!
> It's probably a good idea to have the flush_kernel_dcache_page() in there
> anyway, if only to serve as an example for people that copy it into
> architecture-independent drivers, same as what we do for the
> k{,un}map_atomic() that is also not required on ppc64.
Now my next question: why should I add it, if currently no single driver in
mainline calls flush_kernel_dcache_page()?
`git grep' finds it in the following files only:
Documentation/cachetlb.txt
arch/parisc/kernel/cache.c
arch/parisc/kernel/pacache.S
include/asm-parisc/cacheflush.h
include/linux/highmem.h
With kind regards,
Geert Uytterhoeven
Software Architect
Sony Network and Software Technology Center Europe
The Corporate Village · Da Vincilaan 7-D1 · B-1935 Zaventem · Belgium
Phone: +32 (0)2 700 8453
Fax: +32 (0)2 700 8622
E-mail: [email protected]
Internet: http://www.sony-europe.com/
Sony Network and Software Technology Center Europe
A division of Sony Service Centre (Europe) N.V.
Registered office: Technologielaan 7 · B-1840 Londerzeel · Belgium
VAT BE 0413.825.160 · RPR Brussels
Fortis Bank Zaventem · Swift GEBABEBB08A · IBAN BE39001382358619
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
