linux/arch/s390/mm
David Hildenbrand 0f7f848915 s390/mm: fix races on gmap_shadow creation
Before any thread is allowed to use a gmap_shadow, it has to be fully
initialized. However, for invalidation to work properly, we have to
register the new gmap_shadow before we protect the parent gmap table.

Because locking is tricky, and we have to avoid duplicate gmaps, let's
introduce an initialized field, that signalizes other threads if that
gmap_shadow can already be used or if they have to retry.

Let's properly return errors using ERR_PTR() instead of simply returning
NULL, so a caller can properly react on the error.

Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2016-06-20 09:54:28 +02:00
..
cmm.c s390: convert use of typedef ctl_table to struct ctl_table 2013-10-28 08:36:25 +01:00
dump_pagetables.c s390: remove 31 bit support 2015-03-25 11:49:33 +01:00
extmem.c s390: Use pr_warn instead of pr_warning 2016-03-07 13:12:04 +01:00
fault.c s390/mm: add shadow gmap support 2016-06-20 09:54:04 +02:00
gmap.c s390/mm: fix races on gmap_shadow creation 2016-06-20 09:54:28 +02:00
gup.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2016-04-01 07:15:54 -05:00
hugetlbpage.c s390/mm: uninline pmdp_xxx functions from pgtable.h 2016-03-08 15:00:14 +01:00
init.c s390/mm: fix asce_bits handling with dynamic pagetable levels 2016-04-21 09:50:09 +02:00
maccess.c s390/maccess: reduce stnsm instructions 2016-02-17 09:05:04 +01:00
Makefile s390/extable: use generic search and sort routines 2016-03-22 15:36:02 -07:00
mem_detect.c s390/mem_detect: use unsigned longs 2016-01-11 12:27:11 +01:00
mmap.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2016-05-18 12:17:16 -07:00
page-states.c s390/cmma: remove "cmma disable" code in case of dump again 2014-05-20 08:58:42 +02:00
pageattr.c s390/pageattr: do a single TLB flush for change_page_attr 2016-02-23 08:56:17 +01:00
pgalloc.c s390/mm: add shadow gmap support 2016-06-20 09:54:04 +02:00
pgtable.c s390/mm: shadow pages with real guest requested protection 2016-06-20 09:54:19 +02:00
vmem.c s390/vmem: remove unused function parameter 2016-05-11 10:20:32 +02:00