linux/arch/s390
Christian Borntraeger f8b5ff2cff s390: fix gmap_ipte_notifier vs. software dirty pages
On heavy paging load some guest cpus started to loop in gmap_ipte_notify.
This was visible as stalled cpus inside the guest. The gmap_ipte_notifier
tries to map a user page and then made sure that the pte is valid and
writable. Turns out that with the software change bit tracking the pte
can become read-only (and only software writable) if the page is clean.
Since we loop in this code, the page would stay clean and, therefore,
be never writable again.
Let us just use fixup_user_fault, that guarantees to call handle_mm_fault.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
2013-05-21 11:55:38 +03:00
..
appldata s390/time: rename tod clock access functions 2013-02-14 15:55:10 +01:00
boot s390: fix linker script for 31 bit builds 2012-10-18 17:50:10 +02:00
crypto s390/crypto: Don't panic after crypto instruction failures 2012-11-23 11:14:27 +01:00
hypfs aio: don't include aio.h in sched.h 2013-05-07 20:16:25 -07:00
include s390/kvm: Kick guests out of sie if prefix page host pte is touched 2013-05-21 11:55:24 +03:00
kernel s390/kvm: avoid automatic sie reentry 2013-05-21 11:55:26 +03:00
kvm s390/kvm: avoid automatic sie reentry 2013-05-21 11:55:26 +03:00
lib s390/uaccess: add "fallthrough" comments 2013-05-02 15:50:19 +02:00
math-emu s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
mm s390: fix gmap_ipte_notifier vs. software dirty pages 2013-05-21 11:55:38 +03:00
net s390/bpf,jit: use kcalloc instead of kmalloc and memset 2013-04-17 14:07:27 +02:00
oprofile oprofile, s390: Add support for IBM zEnterprise EC12 2013-04-06 15:25:42 +02:00
pci s390/pci: use pci_scan_root_bus 2013-04-26 09:07:19 +02:00
defconfig s390: update defconfig 2012-09-26 15:45:29 +02:00
Kbuild s390/pci: base support 2012-11-30 15:40:45 +01:00
Kconfig Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal 2013-05-01 07:21:43 -07:00
Kconfig.debug Kconfig: consolidate CONFIG_DEBUG_STRICT_USER_COPY_CHECKS 2013-04-30 17:04:09 -07:00
Makefile s390: remove small stack config option 2013-04-26 09:07:08 +02:00