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linux/arch/s390/kernel
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Martin Schwidefsky 8c071b0f19 s390/time: correct use of store clock fast 
The result of the store-clock-fast (STCKF) instruction is a bit fuzzy.
It can happen that the value stored on one CPU is smaller than the value
stored on another CPU, although the order of the stores is the other
way around. This can cause deltas of get_tod_clock() values to become
negative when they should not be.

We need to be more careful with store-clock-fast, this patch partially
reverts git commit e4b7b4238e666682555461fa52eecd74652f36bb "time:
always use stckf instead of stck if available". The get_tod_clock()
function now uses the store-clock-extended (STCKE) instruction.
get_tod_clock_fast() can be used if the fuzziness of store-clock-fast
is acceptable e.g. for wait loops local to a CPU.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2013-10-22 09:16:40 +02:00
..
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
asm-offsets.c KVM fixes for 3.11 2013-07-03 13:21:40 -07:00
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: delete __cpuinit usage from all s390 files 2013-07-14 19:36:53 -04:00
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 s390/compat,uid16: use current_cred() 2013-09-07 11:58:21 +02:00
compat_linux.h merge compat sys_ipc instances 2013-03-03 23:00:27 -05:00
compat_ptrace.h [S390] ptrace cleanup 2011-01-05 12:47:31 +01:00
compat_signal.c s390/compat,signal: fix return value of copy_siginfo_(to|from)_user32() 2013-10-15 13:47:59 +02:00
compat_wrapper.S switch compat_sys_sysctl to COMPAT_SYSCALL_DEFINE 2013-05-09 14:53:20 -04:00
cpcmd.c s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
crash_dump.c s390: Allow vmalloc target buffers for copy_from_oldmem() 2013-09-30 13:04:40 +02:00
debug.c s390/time: correct use of store clock fast 2013-10-22 09:16:40 +02:00
diag.c [S390] replace diag10() with diag10_range() function 2011-05-10 17:13:43 +02:00
dis.c s390/disassembler: prevent endless loop in print_fn_code() 2013-05-07 14:11:55 +02:00
dumpstack.c s390/dumpstack: convert print_symbol to %pSR 2013-09-04 17:19:07 +02:00
early.c s390/mem_detect: limit memory detection loop to "mem=" parameter 2013-05-02 15:50:26 +02:00
ebcdic.c s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
entry64.S s390: fix system call restart after inferior call 2013-09-30 13:04:40 +02:00
entry.h s390: make various functions static, add declarations to header files 2013-09-07 11:58:03 +02:00
entry.S s390: fix system call restart after inferior call 2013-09-30 13:04:40 +02:00
ftrace.c s390/ftrace: avoid pointer arithmetics with function pointers 2013-09-07 11:58:07 +02:00
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
head.S s390: add zEC12 code generation support 2012-11-23 11:14:31 +01:00
ipl.c s390/ipl: Fix FCP WWPN and LUN format strings for read 2013-06-24 11:16:34 +02:00
irq.c s390/irq: reduce size of external interrupt handler hash array 2013-09-09 08:57:32 +02:00
jump_label.c s390/jump-label: add arch_jump_label_transform_static() 2011-10-25 11:54:37 -07:00
kprobes.c s390/kprobes: add exrl to list of prohibited opcodes 2013-09-30 13:04:38 +02:00
lgr.c s390/sysinfo,stsi: change return code handling 2012-09-26 15:45:12 +02:00
machine_kexec.c s390: make various functions static, add declarations to header files 2013-09-07 11:58:03 +02:00
Makefile s390/mem_detect: move memory detection code to mm folder 2013-05-02 15:50:22 +02:00
mcount64.S s390/ftrace: fix mcount adjustment 2013-05-15 13:09:09 +02:00
mcount.S s390/ftrace: fix mcount adjustment 2013-05-15 13:09:09 +02:00
module.c s390/module: fix compile warning 2013-02-28 09:37:13 +01:00
nmi.c s390/time: clock comparator revalidation 2013-08-22 12:20:08 +02:00
os_info.c Include missing linux/slab.h inclusions 2013-04-29 15:42:01 -04:00
perf_cpum_cf.c s390/irq: rework irq subclass handling 2013-09-04 17:19:13 +02:00
perf_event.c s390/perf: Remove print_hex_dump_bytes() debug output 2013-09-04 17:19:04 +02:00
pgm_check.S s390/traps: preinitialize program check table 2012-11-23 11:14:25 +01:00
process.c s390/time: return with irqs disabled from psw_idle 2013-08-28 09:19:23 +02:00
processor.c s390: delete __cpuinit usage from all s390 files 2013-07-14 19:36:53 -04:00
ptrace.c s390/tx: allow program interruption filtering in user space 2013-08-28 09:19:30 +02:00
reipl64.S s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
reipl.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
relocate_kernel.S s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
runtime_instr.c s390/irq: rework irq subclass handling 2013-09-04 17:19:13 +02:00
s390_ksyms.c KVM: s390,perf: Detect if perf samples belong to KVM host or guest 2013-06-17 17:10:23 +02:00
sclp.S s390/sclp: fix new line detection 2013-06-05 17:36:21 +02:00
setup.c s390: add support for IBM zBC12 machine 2013-07-26 13:25:21 +02:00
signal.c s390/uaccess: remove pointless access_ok() checks 2013-02-28 09:37:09 +01:00
smp.c s390: make various functions static, add declarations to header files 2013-09-07 11:58:03 +02:00
stacktrace.c s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
suspend.c s390: make various functions static, add declarations to header files 2013-09-07 11:58:03 +02:00
swsusp_asm64.S s390/hibernate: add early resume function 2013-08-30 08:57:15 +02:00
sys_s390.c teach SYSCALL_DEFINE<n> how to deal with long long/unsigned long long 2013-03-03 22:46:22 -05:00
syscalls.S switch compat_sys_sysctl to COMPAT_SYSCALL_DEFINE 2013-05-09 14:53:20 -04:00
sysinfo.c s390: delete __cpuinit usage from all s390 files 2013-07-14 19:36:53 -04:00
time.c s390/time: return with irqs disabled from psw_idle 2013-08-28 09:19:23 +02:00
topology.c s390/topology: export cpu_topology 2013-01-08 10:57:10 +01:00
traps.c s390/dumpstack: fix call chain walking 2013-04-17 14:07:28 +02:00
vdso.c s390/mm: cleanup page table definitions 2013-08-22 12:20:06 +02:00
vmlinux.lds.S s390/linker skript: discard exit.data at runtime 2013-02-14 15:55:21 +01:00
vtime.c vtime: Describe overriden functions in dedicated arch headers 2013-08-14 17:14:53 +02:00