- 26 Sep, 2012 40 commits
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Heiko Carstens authored
The generic variant has a local_irq_save/restore pair which is quite expensive. It is sufficient to disable preemption, which is a no-op with !CONFIG_PREEMPT and then use the regular xchg macro. Signed-off-by:
Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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Heiko Carstens authored
Since "Kconfig: split the s390 base menu" CONFIG_KEXEC gets always selected. Therefore there is no point in keeping CONFIG_KEXEC anywhere. Signed-off-by:
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Heiko Carstens authored
Use designated initializers for the irq class array in irq.c so it's always guaranteed that the order of elements is equal to their corresponding parts in irq.h. Signed-off-by:
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Heiko Carstens authored
Get rid of these: arch/s390/kernel/smp.c:134:19: warning: ‘status’ may be used uninitialized in this function [-Wuninitialized] arch/s390/mm/pgtable.c:641:10: warning: ‘table’ may be used uninitialized in this function [-Wuninitialized] arch/s390/mm/pgtable.c:644:12: warning: ‘page’ may be used uninitialized in this function [-Wuninitialized] drivers/s390/cio/cio.c:1037:14: warning: ‘schid’ may be used uninitialized in this function [-Wuninitialized] Signed-off-by:
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Heiko Carstens authored
Move fill_cpu_elf_notes() prototype to header file. This way we get compile errors if e.g. the number of function parameters get changed. Otherwise it's possible to change just the definition and everything else still compiles fine, but the result is broken code. Signed-off-by:
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Heiko Carstens authored
Add appropriate header file: arch/s390/kernel/process.c:327:15: warning: symbol 'arch_align_stack' was not declared. Signed-off-by:
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Heiko Carstens authored
if (MACHINE_HAS_TE) translates to if (0) on !CONFIG_64BIT however the compiler still warns about invalid shifts within non-reachable code. So add an explicit ifdef to get rid of this warning: arch/s390/kernel/ptrace.c: In function ‘update_per_regs’: arch/s390/kernel/ptrace.c:63:4: warning: left shift count >= width of type [enabled by default] arch/s390/kernel/ptrace.c:65:4: warning: left shift count >= width of type [enabled by default] Reported-by:
Fengguang Wu <fengguang.wu@intel.com> Signed-off-by:
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Heiko Carstens authored
The early kernel decrompressing code can't call into the kernel in order to profile branches. Fixes this link error: arch/s390/boot/compressed/misc.o: In function `decompress_kernel': misc.c:(.text+0x9a6): undefined reference to `ftrace_likely_update' Signed-off-by:
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Heiko Carstens authored
The whole hardware support is only available in zArch mode. Fixes also this compile warning: arch/s390/kernel/perf_cpum_cf.c: In function ‘cpumf_pmu_init’: arch/s390/kernel/perf_cpum_cf.c:670:2: warning: left shift count >= width of type [enabled by default] Signed-off-by:
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Heiko Carstens authored
Fix this compile error: In file included from drivers/s390/char/tape_core.c:29:0: drivers/s390/char/tape_std.h:103:66: warning: ‘struct request’ declared inside parameter list [enabled by default] Signed-off-by:
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Heiko Carstens authored
Get rid of this compile warning for CONFIG_32BIT: drivers/s390/crypto/ap_bus.c:168:12: warning: ‘ap_configuration_available’ defined but not used [-Wunused-function] Signed-off-by:
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Wei Yongjun authored
Use for_each_set_bit() to simplify the code. spatch with a semantic match is used to found this. (http://coccinelle.lip6.fr/) Signed-off-by:
Wei Yongjun <yongjun_wei@trendmicro.com.cn> Signed-off-by:
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Jan Glauber authored
Calling debug_event the s390 debug feature only logs up to buf_size bytes of the debug view. If debug_event is called with more bytes than buf_size the additional data is ignored and not logged in the debug view. Use multiple calls to debug_event if the length exceeds buf_size. Signed-off-by:
Jan Glauber <jang@linux.vnet.ibm.com> Signed-off-by:
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Heiko Carstens authored
Signed-off-by:
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Holger Dengler authored
Detect external AP bus configuration changes and request an AP device rescan. Signed-off-by:
Holger Dengler <hd@linux.vnet.ibm.com> Signed-off-by:
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Heiko Carstens authored
Changing the return value of vmlogrdr_open() to -EOPNOTSUPP if O_NONBLOCK is specified shouldn't have any negative side effects. Any existing user wouldn't specify that flag since it wouldn't work anyway. Signed-off-by:
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Heiko Carstens authored
Change return value of appldata_asm() to -EOPNOTSUPP in case of an error. The return value was only used internally and not passed to user space. Signed-off-by:
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Heiko Carstens authored
Returning -ENOSYS on kexec_load() is a bad idea since user space cannot tell if the system call is not implmented or if it failed. Use -EOPNOTSUPP in case somebody tries a kexec_load on a NSS image based kernel instead. Signed-off-by:
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Heiko Carstens authored
Change -ENOSYS to -EOPNOTSUPP. Return value is used only internally. Signed-off-by:
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Heiko Carstens authored
The return value was only internally used, so it's ok to change. Signed-off-by:
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Heiko Carstens authored
For non-existent ioctls -ENOTTY should be returned. Signed-off-by:
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Heiko Carstens authored
Change return code handling of the stsi() function: In case function code 0 was specified the return value is the current configuration level (already shifted). That way all the code that actually copied the stsi_0() function can go away. Otherwise the return value is 0 (success) or negative to indicate an error (currently only -EOPNOTSUPP). Also stsi() is no longer an inline function. The function is not performance critical, but every caller would generate an exception table entry for this function. Signed-off-by:
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Jean Delvare authored
I was checking why this spinlock was never initialized, but it turns out it's not used anywhere, so we can drop it. Signed-off-by:
Jean Delvare <khali@linux-fr.org> Signed-off-by:
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Heiko Carstens authored
This is the s390 port of 70627654 "x86, extable: Switch to relative exception table entries". Reduces the size of our exception tables by 50% on 64 bit builds. Signed-off-by:
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Sebastian Ott authored
Do not reset drvdata before the block device is cleaned up. With a non-empty block queue drvdata could be accessed. Signed-off-by:
Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by:
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Sebastian Ott authored
Remove the spinlock from struct scm_device. drvdata and attributes are guarded via device_lock. Signed-off-by:
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Heiko Carstens authored
The cpu polarization member is the only per cpu state that is not part of the pcpu structure. So add it there and have everything in one place. Signed-off-by:
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Heiko Carstens authored
The maximum nesting of the cpu topology is evaluated when /proc/sysinfo is the first time read. This happens without a lock and a concurrent reader on a different cpu can see and use an invalid intermediate value. Besides the fact that this race is quite unlikely the worst thing that could happen is that /proc/sysinfo would contain bogus information about the machine's cpu topology. Nevertheless this should be fixed. So move the detection code to the early machine detection code and since now the value is early available use it in the topology code as well. Signed-off-by:
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Gerald Schaefer authored
This patch introduces the __get_user_pages_fast() function on s390, which will be needed with CONFIG_TRANSPARENT_HUGEPAGE and futex. Signed-off-by:
Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by:
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Heiko Carstens authored
Add a couple of missing fields that were introduced with z196. Signed-off-by:
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Heiko Carstens authored
The current proc implementation of the /proc/sysinfo file writes all informations contained in all system information blocks to a single page. This is done by calling sprintf all the time in the expectation that everything will fit into a single page. This however is not necessarily true if the configuration of a machine is very large. So convert /proc/sysinfo to avoid writing into random memory regions. For readability reasons a couple of lines are longer than 80 characters. Signed-off-by:
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Heiko Carstens authored
Any change to sysinfo.h causes a whole kernel recompile since sysinfo.h is included by topology.h, which again is used nearly everywhere. So remove that include and add a forward declaration instead. Signed-off-by:
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Heiko Carstens authored
Shorten the code for addressing mode initialization. Also add missing __init annotations, since this code is only used during kernel initialization. Signed-off-by:
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Heiko Carstens authored
Renaming the globally visible variable "user_mode" to "addressing_mode" in order to fix a name clash was not a good idea. (Commit 37fe1d73 "s390/mm: rename user_mode variable to addressing_mode") Looking at the code after a couple of weeks one thinks: addressing mode of what? So rename the variable again. This time to s390_user_mode. Which hopefully makes more sense. Signed-off-by:
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Stefan Weinhuber authored
In some usage scenarios it is desireable to work with disk images or virtualized DASD devices. One problem that prevents such applications is the partition detection in ibm.c. Currently it works only for devices that support the BIODASDINFO2 ioctl, in other words, it only works for devices that belong to the DASD device driver. The information gained from the BIODASDINFO2 ioctl is only for a small set of legacy cases abolutely necessary. All current VOL1, LNX1 and CMS1 type of disk labels can be interpreted correctly without this information, as long as the generic HDIO_GETGEO ioctl works and provides a correct disk geometry. This patch makes the ibm.c partition detection as independent as possible from the BIODASDINFO2 ioctl. Only the following two cases are still restricted to real DASDs: - An FBA DASD, or LDL formatted ECKD DASD without any disk label. - An old style LNX1 label (without large volume support) on a disk with inconsistent device geometry. Signed-off-by:
Stefan Weinhuber <wein@de.ibm.com> Signed-off-by:
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Heiko Carstens authored
Change the default addressing mode so that user space runs in primary space and the kernel runs in home space. In addition remove the "switch_amode" kernel parameter so all users who already specified they want the new default behaviour will stay in the "switched" mode instead of in the opposite they intended. If there is a need to switch addressing modes, this can be done with the "user_mode" kernel parameter: user_mode=home Signed-off-by:
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Heiko Carstens authored
When a sigp instruction is issued it may store a status. This status is currently stored in a per cpu field of the target cpu. If multiple cpus issue a sigp instruction with the same target cpu and a status is stored the result is not necessarily as expected. Currently this is not an issue: - on cpu hotplug no sigps, except "restart" and "sense" are sent to the target cpu. - on external call we don't look at the status if it is stored - on sense running the condition code "status stored" is sufficient to tell if a cpu is running or not Signed-off-by:
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Heiko Carstens authored
Signed-off-by:
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Heiko Carstens authored
Add a line for each cpu cache to /proc/cpuinfo. Since we only have information of private cpu caches in sysfs we add a line for each cpu cache in /proc/cpuinfo which will also contain information about shared caches. For a z196 machine /proc/cpuinfo now looks like: vendor_id : IBM/S390 bogomips per cpu: 14367.00 features : esan3 zarch stfle msa ldisp eimm dfp etf3eh highgprs cache0 : level=1 type=Data scope=Private size=64K line_size=256 associativity=4 cache1 : level=1 type=Instruction scope=Private size=128K line_size=256 associativity=8 cache2 : level=2 type=Unified scope=Private size=1536K line_size=256 associativity=12 cache3 : level=3 type=Unified scope=Shared size=24576K line_size=256 associativity=12 cache4 : level=4 type=Unified scope=Shared size=196608K line_size=256 associativity=24 processor 0: version = FF, identification = 000123, machine = 2817 processor 1: version = FF, identification = 100123, machine = 2817 processor 2: version = FF, identification = 200123, machine = 2817 processor 3: version = FF, identification = 200123, machine = 2817 Signed-off-by:
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Martin Schwidefsky authored
Allow user-space processes to use transactional execution (TX). If the TX facility is available user space programs can use transactions for fine-grained serialization based on the data objects that are referenced during a transaction. This is useful for lockless data structures and speculative compiler optimizations. Signed-off-by:
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