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linux/arch/s390/kernel
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Heiko Carstens d911e03d09 s390/timer: avoid overflow when programming clock comparator 
Since ed4f209 "s390/time: fix sched_clock() overflow" a new helper function
is used to avoid overflows when converting TOD format values to nanosecond
values.
The kvm interrupt code formerly however only worked by accident because of
an overflow. It tried to program a timer that would expire in more than ~29
years. Because of the old TOD-to-nanoseconds overflow bug the real expiry
value however was much smaller, but now it isn't anymore.
This however triggers yet another bug in the function that programs the clock
comparator s390_next_ktime(): if the absolute "expires" value is after 2042
this will result in an overflow and the programmed value is lower than the
current TOD value which immediatly triggers a clock comparator (= timer)
interrupt.
Since the timer isn't expired it will be programmed immediately again and so
on... the result is a dead system.
To fix this simply program the maximum possible value if an overflow is
detected.

Reported-by: Christian Borntraeger <borntraeger@de.ibm.com>
Tested-by: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: stable@vger.kernel.org # v3.3+
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
 		2013-01-31 14:01:52 +01:00
..
vdso32 s390: add various .gitignore files. 2012-05-16 14:42:41 +02:00
vdso64 s390: add various .gitignore files. 2012-05-16 14:42:41 +02:00
.gitignore s390: add various .gitignore files. 2012-05-16 14:42:41 +02:00
Makefile s390/traps: preinitialize program check table 2012-11-23 11:14:25 +01:00
asm-offsets.c s390: add support for transactional memory 2012-09-26 15:45:02 +02:00
audit.c [S390] Get rid of a bunch of sparse warnings again. 2007-10-12 16:13:06 +02:00
audit.h [S390] Get rid of a bunch of sparse warnings again. 2007-10-12 16:13:06 +02:00
base.S s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
bitmap.c s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
cache.c s390/cache: fix data/instruction cache output 2012-10-18 17:50:11 +02:00
compat_audit.c [S390] Get rid of a bunch of sparse warnings again. 2007-10-12 16:13:06 +02:00
compat_exec_domain.c s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
compat_linux.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal 2012-10-10 12:02:25 +09:00
compat_linux.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal 2012-10-10 12:02:25 +09:00
compat_ptrace.h [S390] ptrace cleanup 2011-01-05 12:47:31 +01:00
compat_signal.c s390/signal: set correct address space control 2012-11-12 16:24:38 +01:00
compat_wrapper.S s390/syscalls: wire up finit_module syscall 2013-01-08 10:57:05 +01:00
cpcmd.c s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
crash_dump.c s390/crashdump: move fill_cpu_elf_notes() prototype to header file 2012-09-26 15:45:22 +02:00
debug.c s390/debug: Fix s390dbf lockdep problem in debug_(un)register_view() 2013-01-08 10:57:03 +01:00
diag.c [S390] replace diag10() with diag10_range() function 2011-05-10 17:13:43 +02:00
dis.c s390/pci: base support 2012-11-30 15:40:45 +01:00
early.c s390/mm: use pfmf instruction to initialize storage keys 2012-10-09 14:16:55 +02:00
ebcdic.c s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
entry.S Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2012-12-13 14:20:19 -08:00
entry.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2012-12-13 14:20:19 -08:00
entry64.S Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2012-12-13 14:20:19 -08:00
ftrace.c [S390] cleanup ftrace backend functions 2011-01-05 12:47:31 +01:00
head.S s390: add zEC12 code generation support 2012-11-23 11:14:31 +01:00
head31.S s390/mm: let kernel text section always begin at 1MB 2012-10-09 14:16:59 +02:00
head64.S s390/mm: let kernel text section always begin at 1MB 2012-10-09 14:16:59 +02:00
head_kdump.S s390/kdump: Use 64 bit mode for 0x10000 entry point 2012-10-18 17:50:09 +02:00
ipl.c s390/ipl: Use diagnose 8 command separation 2012-07-26 10:07:26 +02:00
irq.c s390/irq: count cpu restart events 2013-01-08 10:57:07 +01:00
jump_label.c s390/jump-label: add arch_jump_label_transform_static() 2011-10-25 11:54:37 -07:00
kprobes.c s390/exceptions: switch to relative exception table entries 2012-09-26 15:45:10 +02:00
lgr.c s390/sysinfo,stsi: change return code handling 2012-09-26 15:45:12 +02:00
machine_kexec.c s390/crashdump: move fill_cpu_elf_notes() prototype to header file 2012-09-26 15:45:22 +02:00
mcount.S s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
mcount64.S s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
mem_detect.c [S390] Rework create_mem_hole() function 2011-12-27 11:27:09 +01:00
module.c s390/vmalloc: have separate modules area 2012-10-09 14:17:01 +02:00
nmi.c s390/irq: remove split irq fields from /proc/stat 2013-01-08 10:57:07 +01:00
os_info.c s390/smp: make absolute lowcore / cpu restart parameter accesses more robust 2012-06-14 09:09:02 +02:00
perf_cpum_cf.c s390/irq: remove split irq fields from /proc/stat 2013-01-08 10:57:07 +01:00
perf_event.c [S390] Fix build errors (fallout from system.h disintegration) 2012-03-30 09:41:12 +02:00
pgm_check.S s390/traps: preinitialize program check table 2012-11-23 11:14:25 +01:00
process.c flagday: don't pass regs to copy_thread() 2012-11-28 23:43:42 -05:00
processor.c s390/processor: use ARRAY_SIZE instead of hard coded value 2012-09-26 15:45:03 +02:00
ptrace.c s390/ptrace: add missing ifdef 2012-09-26 15:45:21 +02:00
reipl.S s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
reipl64.S s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
relocate_kernel.S s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
relocate_kernel64.S s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
runtime_instr.c s390/irq: remove split irq fields from /proc/stat 2013-01-08 10:57:07 +01:00
s390_ksyms.c s390/string: provide asm lib functions for memcpy and memcmp 2012-09-26 15:44:50 +02:00
sclp.S s390/sclp: fix addressing mode clobber 2012-11-06 22:39:51 +01:00
setup.c s390/pm: export pm_power_off 2013-01-08 10:57:09 +01:00
signal.c s390/ptrace: race of single stepping vs signal delivery 2012-11-23 11:14:33 +01:00
smp.c s390/irq: count cpu restart events 2013-01-08 10:57:07 +01:00
stacktrace.c s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
suspend.c Disintegrate asm/system.h for S390 2012-03-28 18:30:02 +01:00
swsusp_asm64.S s390/sigp: use sigp order code defines in assembly code 2012-06-05 13:23:36 +02:00
sys_s390.c s390: do not clobber personality flags in sys_32_personality() 2012-08-08 07:32:56 -07:00
syscalls.S s390/syscalls: wire up finit_module syscall 2013-01-08 10:57:05 +01:00
sysinfo.c s390/sysinfo,stsi: change return code handling 2012-09-26 15:45:12 +02:00
time.c s390/timer: avoid overflow when programming clock comparator 2013-01-31 14:01:52 +01:00
topology.c s390/topology: export cpu_topology 2013-01-08 10:57:10 +01:00
traps.c s390/traps: preinitialize program check table 2012-11-23 11:14:25 +01:00
vdso.c s390/mm: rename addressing_mode to s390_user_mode 2012-09-26 15:45:05 +02:00
vmlinux.lds.S s390: fix linker script for 31 bit builds 2012-10-18 17:50:10 +02:00
vtime.c vtime: Warn if irqs aren't disabled on system time accounting APIs 2012-11-20 15:42:51 +01:00