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| * s390/cpum_sf: Atomically reset trailer entry fields of sample-data-blocksHendrik Brueckner2013-12-16
| | | | | | | | | | | | | | | | | | Ensure to reset the sample-data-block full indicator and the overflow counter at the same time. This must be done atomically because the sampling hardware is still active while full sample-data-block is processed. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * s390/cpum_sf: Dynamically extend the sampling buffer if overflows occurHendrik Brueckner2013-12-16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Improve the sampling buffer allocation and add a function to reallocate and increase the sampling buffer structure. The number of allocated buffer elements (sample-data-blocks) are accounted. You can control the minimum and maximum number these sample-data-blocks through the cpum_sfb_size kernel parameter. The number hardware sample overflows (if any) are also accounted and stored per perf event. During the PMU disable/enable calls, the accumulated overflow counter is analyzed and, if necessary, the sampling buffer is dynamically increased. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * s390/perf: Add service level information for CPU-Measurement FacilitiesHendrik Brueckner2013-12-16
| | | | | | | | | | | | | | | | Register a service level handler to report information about available CPU-Measurement facilities. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * s390/perf,oprofile: Share sampling facilityHendrik Brueckner2013-12-16
| | | | | | | | | | | | | | | | | | Introduce reserve/release functions to share the sampling facility between perf and oprofile. Also improve error handling for the sampling facility support in perf. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * s390/perf: Improve PMU selection for PERF_COUNT_HW_CPU_CYCLES eventsHendrik Brueckner2013-12-16
| | | | | | | | | | | | | | | | | | | | | | | | The cpum_cf (counter facility) PMU does not support sampling events. With cpum_sf (sampling facility), a PMU for sampling CPU cycles is available. Make cpum_sf the "default" PMU for PERF_COUNT_HW_CPU_CYCLES sampling events but use the more precise cpum_cf PMU for non-sampling events. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * s390/perf: add support for the CPU-Measurement Sampling FacilityHendrik Brueckner2013-12-16
| | | | | | | | | | | | | | | | | | | | | | | | | | Introduce a perf PMU, "cpum_sf", to support the CPU-Measurement Sampling Facility. You can control the sampling facility through this perf PMU interfaces. Perf sampling events are created for hardware samples. For details about the CPU-Measurement Sampling Facility, see "The Load-Program-Parameter and the CPU-Measurement Facilities" (SA23-2260). Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * s390/cpum_cf: Export event names in sysfsHendrik Brueckner2013-12-16
| | | | | | | | | | | | | | | | | | | | | | Provide PMU event attributes for supported counters and export their symbolic names to the sysfs "events" directory. See the /sys/devices/cpum_cf/events/ directory for a list of available counters. Note that you might require counter set authorizations for the LPAR to use them. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * s390/compat: correct check for EFAULT in rt-signal frame creationMartin Schwidefsky2013-12-16
| | | | | | | | | | | | | | | | | | The return code of the __put_user call to store the rt_sigreturn system call to the user stack if not properly checked, the err variable is only checked before to the __put_user. Use an if statement instead. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * s390/smp: reduce memory consumption of pcpu_devices arrayHeiko Carstens2013-12-16
| | | | | | | | | | | | | | | | | | | | | | | | Remove the embedded struct cpu from struct pcpu and replace it with a pointer instead. The struct cpu now gets allocated when a new cpu gets detected. The size of the pcpu_devices array (NR_CPUS * sizeof(struct pcpu)) gets reduced by nearly 120KB. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * s390: optimize control register updateMartin Schwidefsky2013-12-16
| | | | | | | | | | | | | | | | It is less expensive to update control registers 0 and 2 with two individual stctg/lctlg instructions as with a single one that spans control register 0, 1 and 2. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * s390/ptrace: simplify enable/disable single stepMartin Schwidefsky2013-12-16
| | | | | | | | | | | | | | | | | | The user_enable_single_step() and user_disable_sindle_step() functions are always called on the inferior, never for the currently active process. Remove the unnecessary check for the current process and the update_cr_regs() call from the enable/disable functions. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * s390/smp: only send external call ipi if neededHeiko Carstens2013-12-16
| | | | | | | | | | | | | | | | | | If the per cpu ec_mask bit of the receiving cpu is already set there is no need to send an ipi, since a different cpu has already sent an ipi and the receiving cpu has not yet executed the external call ipi handler. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* | s390/smp: improve setup of possible cpu maskHeiko Carstens2013-12-18
|/ | | | | | | | | | Since under z/VM we cannot have more than 64 cpus, make sure the cpu_possible_mask does not contain more bits. This avoids wasting memory for dynamic per-cpu allocations if CONFIG_NR_CPUS is larger than 64. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/time,vdso: fix clock_gettime for CLOCK_MONOTONICMartin Schwidefsky2013-12-02
| | | | | | | | | | | With git commit 79c74ecbebf76732f91b82a62ce7fc8a88326962 "s390/time,vdso: convert to the new update_vsyscall interface" the new update_vsyscall function already does the sum of xtime and wall_to_monotonic. The old update_vsyscall function only copied the wall_to_monotonic offset. The vdso code needs to be modified to take this into consideration. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/vdso: ectg gettime support for CLOCK_THREAD_CPUTIME_IDMartin Schwidefsky2013-12-02
| | | | | | | | | | The code to use the ECTG instruction to calculate the cputime for the current thread is currently used only for the per-thread CPU-clock with the clockid -2 (PID=0, VIRT=1). Use the same code for the clockid CLOCK_THREAD_CPUTIME_ID to speed up the more common clockid as well. Reported-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/vdso: fix access-list entry initializationHeiko Carstens2013-12-02
| | | | | | | | | | | The access-list entry is supposed to have the fetch-only bit set, however a reserved bit got set instead. Userspace isn't able to write to the page anyway since the accessed page has the read-only bit set. So this saves us only for bad surprises in the future if the reserved bit gets used. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/mm: handle asce-type exceptions as normal page faultMartin Schwidefsky2013-11-25
| | | | | | | | | | | | | | | | Git commit 9e34f2686bb088b211b6cac8772e1f644c6180f8 "s390/mm,tlb: tlb flush on page table upgrade fixup" removed the exception handler for the asce-type exception. This is incorrect as the user-copy with MVCOS can cause asce-type exceptions in the kernel if a user pointer is too large. Those need to be handled with do_no_context to branch to the fixup in the user-copy code. The simplest fix for this problem is to call do_dat_exception for asce-type excpetions, as there is no vma for the address the code will handle the exception correctly. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390,time: revert direct ktime path for s390 clockevent deviceMartin Schwidefsky2013-11-25
| | | | | | | | | | | | | | | | | | Git commit 4f37a68cdaf6dea833cfdded2a3e0c47c0f006da "s390: Use direct ktime path for s390 clockevent device" makes use of the CLOCK_EVT_FEAT_KTIME clockevent option to avoid the delta calculation with ktime_get() in clockevents_program_event and the get_tod_clock() in s390_next_event. This is based on the assumption that the difference between the internal ktime and the hardware clock is reflected in the wall_to_monotonic delta. But this is not true, the ntp corrections are applied via changes to the tk->mult multiplier and this is not reflected in wall_to_monotonic. In theory this could be solved by using the raw monotonic clock but it is simpler to switch back to the standard clock delta calculation. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/time,vdso: convert to the new update_vsyscall interfaceMartin Schwidefsky2013-11-25
| | | | | | | Switch to the improved update_vsyscall interface that provides sub-nanosecond precision for gettimeofday and clock_gettime. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/signal: always restore saved runtime instrumentation psw bitHendrik Brueckner2013-11-20
| | | | | | | | | | | | | | | | Commit "s390: fix handling of runtime instrumentation psw bit" (5ebf250dab) changed the behavior of setting the runtime instrumentation psw bit. This commit restores the original logic: 1. When returning from the signal handler, the runtime instrumentation psw bit is restored to its saved state. 2. If the runtime instrumentation psw bit is enabled during the signal handler, it is always turned off when leaving the signal handler. The saved state is restored as described in 1. That also implies that turning on runtime instrumentation in the signal handler is only effective while running in the signal context. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
* Merge branch 'for-linus' of ↵Linus Torvalds2013-11-19
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux Pull second set of s390 patches from Martin Schwidefsky: "The handling of the PCI hotplug notifications has been improved, the zfcp dumper can now detect the HSA size dynamically and the default install kernel has been changed to the compressed bzImage. And two bug-fixes for scm and 3720" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: s390/pci: implement hotplug notifications s390/scm_block: do not hide eadm subchannel dependency s390/sclp: Consolidate early sclp init calls to sclp_early_detect() s390/sclp: Move early code from sclp_cmd.c to sclp_early.c s390/sclp: Determine HSA size dynamically for zfcpdump s390/sclp: Move declarations for sclp_sdias into separate header file s390/pci: implement pcibios_remove_bus s390/pci: improve handling of bus resources s390/3270: fix missing device_destroy() call s390/boot: Install bzImage as default kernel image
| * s390/sclp: Consolidate early sclp init calls to sclp_early_detect()Michael Holzheu2013-11-15
| | | | | | | | | | | | | | | | | | The new function calls the old ones. The sclp_event_mask_early() is removed and replaced by one invocation of sclp_set_event_mask(0, 0). Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * s390/sclp: Determine HSA size dynamically for zfcpdumpMichael Holzheu2013-11-15
| | | | | | | | | | | | | | | | | | Currently we have hardcoded the HSA size to 32 MiB. With this patch the HSA size is determined dynamically via SCLP in early.c. Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* | Merge branch 'for-linus' of ↵Linus Torvalds2013-11-15
|\ \ | |/ |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial Pull trivial tree updates from Jiri Kosina: "Usual earth-shaking, news-breaking, rocket science pile from trivial.git" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (23 commits) doc: usb: Fix typo in Documentation/usb/gadget_configs.txt doc: add missing files to timers/00-INDEX timekeeping: Fix some trivial typos in comments mm: Fix some trivial typos in comments irq: Fix some trivial typos in comments NUMA: fix typos in Kconfig help text mm: update 00-INDEX doc: Documentation/DMA-attributes.txt fix typo DRM: comment: `halve' -> `half' Docs: Kconfig: `devlopers' -> `developers' doc: typo on word accounting in kprobes.c in mutliple architectures treewide: fix "usefull" typo treewide: fix "distingush" typo mm/Kconfig: Grammar s/an/a/ kexec: Typo s/the/then/ Documentation/kvm: Update cpuid documentation for steal time and pv eoi treewide: Fix common typo in "identify" __page_to_pfn: Fix typo in comment Correct some typos for word frequency clk: fixed-factor: Fix a trivial typo ...
| * doc: typo on word accounting in kprobes.c in mutliple architecturesAnoop Thomas Mathew2013-10-14
| | | | | | | | | | Signed-off-by: Anoop Thomas Mathew <atm@profoundis.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
* | Merge branch 'akpm' (patches from Andrew Morton)Linus Torvalds2013-11-13
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Merge first patch-bomb from Andrew Morton: "Quite a lot of other stuff is banked up awaiting further next->mainline merging, but this batch contains: - Lots of random misc patches - OCFS2 - Most of MM - backlight updates - lib/ updates - printk updates - checkpatch updates - epoll tweaking - rtc updates - hfs - hfsplus - documentation - procfs - update gcov to gcc-4.7 format - IPC" * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (269 commits) ipc, msg: fix message length check for negative values ipc/util.c: remove unnecessary work pending test devpts: plug the memory leak in kill_sb ./Makefile: export initial ramdisk compression config option init/Kconfig: add option to disable kernel compression drivers: w1: make w1_slave::flags long to avoid memory corruption drivers/w1/masters/ds1wm.cuse dev_get_platdata() drivers/memstick/core/ms_block.c: fix unreachable state in h_msb_read_page() drivers/memstick/core/mspro_block.c: fix attributes array allocation drivers/pps/clients/pps-gpio.c: remove redundant of_match_ptr kernel/panic.c: reduce 1 byte usage for print tainted buffer gcov: reuse kbasename helper kernel/gcov/fs.c: use pr_warn() kernel/module.c: use pr_foo() gcov: compile specific gcov implementation based on gcc version gcov: add support for gcc 4.7 gcov format gcov: move gcov structs definitions to a gcc version specific file kernel/taskstats.c: return -ENOMEM when alloc memory fails in add_del_listener() kernel/taskstats.c: add nla_nest_cancel() for failure processing between nla_nest_start() and nla_nest_end() kernel/sysctl_binary.c: use scnprintf() instead of snprintf() ...
| * | mm/arch: use NUMA_NO_NODEJianguo Wu2013-11-12
| | | | | | | | | | | | | | | | | | | | | | | | | | | Use more appropriate NUMA_NO_NODE instead of -1 in all archs' module_alloc() Signed-off-by: Jianguo Wu <wujianguo@huawei.com> Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | | Merge branch 'for-linus' of ↵Linus Torvalds2013-11-13
|\ \ \ | |/ / |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull vfs updates from Al Viro: "All kinds of stuff this time around; some more notable parts: - RCU'd vfsmounts handling - new primitives for coredump handling - files_lock is gone - Bruce's delegations handling series - exportfs fixes plus misc stuff all over the place" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (101 commits) ecryptfs: ->f_op is never NULL locks: break delegations on any attribute modification locks: break delegations on link locks: break delegations on rename locks: helper functions for delegation breaking locks: break delegations on unlink namei: minor vfs_unlink cleanup locks: implement delegations locks: introduce new FL_DELEG lock flag vfs: take i_mutex on renamed file vfs: rename I_MUTEX_QUOTA now that it's not used for quotas vfs: don't use PARENT/CHILD lock classes for non-directories vfs: pull ext4's double-i_mutex-locking into common code exportfs: fix quadratic behavior in filehandle lookup exportfs: better variable name exportfs: move most of reconnect_path to helper function exportfs: eliminate unused "noprogress" counter exportfs: stop retrying once we race with rename/remove exportfs: clear DISCONNECTED on all parents sooner exportfs: more detailed comment for path_reconnect ...
| * | constify copy_siginfo_to_user{,32}()Al Viro2013-11-09
| | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | | Merge branch 'irq-core-for-linus' of ↵Linus Torvalds2013-11-11
|\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull IRQ changes from Ingo Molnar: "The biggest change this cycle are the softirq/hardirq stack interaction and nesting fixes, cleanups and reorganizations from Frederic. This is the longer followup story to the softirq nesting fix that is already upstream (commit ded797547548: "irq: Force hardirq exit's softirq processing on its own stack")" * 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: irqchip: bcm2835: Convert to use IRQCHIP_DECLARE macro powerpc: Tell about irq stack coverage x86: Tell about irq stack coverage irq: Optimize softirq stack selection in irq exit irq: Justify the various softirq stack choices irq: Improve a bit softirq debugging irq: Optimize call to softirq on hardirq exit irq: Consolidate do_softirq() arch overriden implementations x86/irq: Correct comment about i8259 initialization
| * | | irq: Consolidate do_softirq() arch overriden implementationsFrederic Weisbecker2013-10-01
| |/ / | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | All arch overriden implementations of do_softirq() share the following common code: disable irqs (to avoid races with the pending check), check if there are softirqs pending, then execute __do_softirq() on a specific stack. Consolidate the common parts such that archs only worry about the stack switch. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@au1.ibm.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul Mackerras <paulus@au1.ibm.com> Cc: James Hogan <james.hogan@imgtec.com> Cc: James E.J. Bottomley <jejb@parisc-linux.org> Cc: Helge Deller <deller@gmx.de> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: David S. Miller <davem@davemloft.net> Cc: Andrew Morton <akpm@linux-foundation.org>
* | | s390/mm,tlb: correct tlb flush on page table upgradeMartin Schwidefsky2013-11-04
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The IDTE instruction used to flush TLB entries for a specific address space uses the address-space-control element (ASCE) to identify affected TLB entries. The upgrade of a page table adds a new top level page table which changes the ASCE. The TLB entries associated with the old ASCE need to be flushed and the ASCE for the address space needs to be replaced synchronously on all CPUs which currently use it. The concept of a lazy ASCE update with an exception handler is broken. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* | | s390/vtime: correct idle time calculationMartin Schwidefsky2013-10-31
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Use the ACCESS_ONCE macro for both accesses to idle->sequence in the loops to calculate the idle time. If only one access uses the macro, the compiler is free to cache the value for the second access which can cause endless loops. Cc: stable@vger.kernel.org # 3.6+ Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* | | s390: convert use of typedef ctl_table to struct ctl_tableJoe Perches2013-10-28
| | | | | | | | | | | | | | | | | | | | | | | | This typedef is unnecessary and should just be removed. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* | | s390/compat: make psw32_user_bits a constant value againHeiko Carstens2013-10-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Make psw32_user_bits a constant value again. This is a leftover of the code which allowed to run the kernel either in primary or home space which got removed with 9a905662 "s390/uaccess: always run the kernel in home space". Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* | | s390: fix handling of runtime instrumentation psw bitHeiko Carstens2013-10-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Fix the following bugs: - When returning from a signal the signal handler copies the saved psw mask from user space and uses parts of it. Especially it restores the RI bit unconditionally. If however the machine doesn't support RI, or RI is disabled for the task, the last lpswe instruction which returns to user space will generate a specification exception. To fix this check if the RI bit is allowed to be set and kill the task if not. - In the compat mode signal handler code the RI bit of the psw mask gets propagated to the mask of the return psw: if user space enables RI in the signal handler, RI will also be enabled after the signal handler is finished. This is a different behaviour than with 64 bit tasks. So change this to match the 64 bit semantics, which restores the original RI bit value. - Fix similar oddities within the ptrace code as well. Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* | | s390: fix save and restore of the floating-point-control registerMartin Schwidefsky2013-10-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The FPC_VALID_MASK has been used to check the validity of the value to be loaded into the floating-point-control register. With the introduction of the floating-point extension facility and the decimal-floating-point additional bits have been defined which need to be checked in a non straight forward way. So far these bits have been ignored which can cause an incorrect results for decimal- floating-point operations, e.g. an incorrect rounding mode to be set after signal return. The static check with the FPC_VALID_MASK is replaced with a trial load of the floating-point-control value, see test_fp_ctl. In addition an information leak with the padding word between the floating-point-control word and the floating-point registers in the s390_fp_regs is fixed. Reported-by: Heiko Carstens <heiko.carstens@de.ibm.com> Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* | | s390/cache: get rid of compile warningHeiko Carstens2013-10-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Get rid of this one: arch/s390/kernel/cache.c: In function 'cache_build_info': arch/s390/kernel/cache.c:144: warning: 'private' may be used uninitialized in this function Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* | | s390/compat,signal: change return values to -EFAULTHeiko Carstens2013-10-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Instead of returnin the number of bytes not copied and/or -EFAULT let the signal handler helper functions always return -EFAULT if a user space access failed. This doesn't fix a bug in the current code, but makes is harder to get it wrong in the future. Also "smatch" won't complain anymore about the fact that the number of remaining bytes gets returned instead of -EFAULT. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* | | s390: Remove zfcpdump NR_CPUS dependencyMichael Holzheu2013-10-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently zfpcdump can only collect registers for up to CONFIG_NR_CPUS CPUss. This dependency is not necessary. So remove it by dynamically allocating the save area array. Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* | | s390/ftrace: prepare_ftrace_return() function call orderHeiko Carstens2013-10-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Steven Rostedt noted that s390 is the only architecture which calls ftrace_push_return_trace() before ftrace_graph_entry() and therefore has the small advantage that trace.depth gets initialized automatically. However this small advantage isn't worth the difference and possible subtle breakage that may result from this. So change s390 to have the same function call order like all other architectures: first ftrace_graph_entry(), then ftrace_push_return_trace() Reported-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* | | s390/crashdump: remove unused variableHeiko Carstens2013-10-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Get rid of this compile warning: arch/s390/kernel/crash_dump.c: In function 'copy_from_realmem': arch/s390/kernel/crash_dump.c:48:6: warning: unused variable 'rc' [-Wunused-variable] int rc; ^ Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* | | s390/mm: do not initialize storage keysMartin Schwidefsky2013-10-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | With dirty and referenced bits implemented in software it is unnecessary to initialize the storage key for every page. With this patch not a single storage key operation is done for a system that does not use KVM. For KVM set_pte_at/pgste_set_key will do the initialization for the guest view of the storage key when the mapping for the page is established in the host. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* | | s390/uaccess: always run the kernel in home spaceMartin Schwidefsky2013-10-24
| | | | | | | | | | | | | | | | | | | | | Simplify the uaccess code by removing the user_mode=home option. The kernel will now always run in the home space mode. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* | | s390/bitops: use generic find bit functions / reimplement _left variantHeiko Carstens2013-10-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Just like all other architectures we should use out-of-line find bit operations, since the inline variant bloat the size of the kernel image. And also like all other architecures we should only supply optimized variants of the __ffs, ffs, etc. primitives. Therefore this patch removes the inlined s390 find bit functions and uses the generic out-of-line variants instead. The optimization of the primitives follows with the next patch. With this patch also the functions find_first_bit_left() and find_next_bit_left() have been reimplemented, since logically, they are nothing else but a find_first_bit()/find_next_bit() implementation that use an inverted __fls() instead of __ffs(). Also the restriction that these functions only work on machines which support the "flogr" instruction is gone now. This reduces the size of the kernel image (defconfig, -march=z9-109) by 144,482 bytes. Alone the size of the function build_sched_domains() gets reduced from 7 KB to 3,5 KB. We also git rid of unused functions like find_first_bit_le()... Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* | | s390/bitops: optimize set_bit() for constant valuesHeiko Carstens2013-10-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Since zEC12 we have the interlocked-access facility 2 which allows to use the instructions ni/oi/xi to update a single byte in storage with compare-and-swap semantics. So change set_bit(), clear_bit() and change_bit() to generate such code instead of a compare-and-swap loop (or using the load-and-* instruction family), if possible. This reduces the text segment by yet another 8KB (defconfig). Alternatively the long displacement variants niy/oiy/xiy could have been used, but the extended displacement field is usually not needed and therefore would only increase the size of the text segment again. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* | | s390/bitops: remove CONFIG_SMP / simplify non-atomic bitopsHeiko Carstens2013-10-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Remove CONFIG_SMP from bitops code. This reduces the C code significantly but also generates better code for the SMP case. This means that for !CONFIG_SMP set_bit() and friends now also have compare and swap semantics (read: more code). However nobody really cares for !CONFIG_SMP and this is the trade-off to simplify the SMP code which we do care about. The non-atomic bitops like __set_bit() now generate also better code because the old code did not have a __builtin_contant_p() check for the CONFIG_SMP case and therefore always generated the inline assembly variant. However the inline assemblies for the non-atomic case now got completely removed since gcc can produce better code, which accesses less memory operands. test_bit() got also a bit simplified since it did have a __builtin_constant_p() check, however two identical code pathes for each case (written differently). In result this mainly reduces the to be maintained code but is not very relevant for code generation, since there are not many non-atomic bitops usages that we care about. (code reduction defconfig kernel image before/after: 560 bytes). Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* | | s390/kprobes: allow kprobes only on known instructionsHeiko Carstens2013-10-24
| | | | | | | | | | | | | | | | | | | | | | | | Since we have an in-kernel disassembler we can make sure that there won't be any kprobes set on random data. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* | | s390/kprobes: use insn_length helper functionHeiko Carstens2013-10-24
| | | | | | | | | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* | | s390/dis: move disassembler function prototypes to proper header fileHeiko Carstens2013-10-24
| | | | | | | | | | | | | | | | | | | | | | | | Now that the in-kernel disassembler has an own header file move the disassembler related function prototypes to that header file. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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