Messages in this thread | | | Date | Tue, 9 Mar 2010 12:37:48 -0800 | From | Andrew Morton <> | Subject | Re: [PATCH 2/2] memory hotplug/s390: set phys_device |
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On Tue, 9 Mar 2010 18:20:52 +0100 Heiko Carstens <heiko.carstens@de.ibm.com> wrote:
> From: Heiko Carstens <heiko.carstens@de.ibm.com> > > Implement arch specific arch_get_memory_phys_device function and initialize > phys_device for each memory section. That way we finally can tell which > piece of memory belongs to which physical device. > > Cc: Dave Hansen <haveblue@us.ibm.com> > Cc: Gerald Schaefer <gerald.schaefer@de.ibm.com> > Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> > Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> > --- > drivers/s390/char/sclp_cmd.c | 7 +++++++ > 1 file changed, 7 insertions(+) > > --- a/drivers/s390/char/sclp_cmd.c > +++ b/drivers/s390/char/sclp_cmd.c > @@ -704,6 +704,13 @@ int sclp_chp_deconfigure(struct chp_id c > return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8); > } > > +int arch_get_memory_phys_device(unsigned long start_pfn) > +{ > + if (!rzm) > + return 0; > + return PFN_PHYS(start_pfn) / rzm; > +} > + > struct chp_info_sccb { > struct sccb_header header; > u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
What is the utility of this patch? It makes s390's /sys/devices/system/memory/memoryX/phys_device display the correct thing?
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