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* Merge branch 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6Linus Torvalds2008-10-11
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6: (27 commits) [S390] Fix checkstack for s390 [S390] fix initialization of stp [S390] 3215: Remove tasklet. [S390] console flush on panic / reboot [S390] introduce dirty bit for kvm live migration [S390] Add ioctl support for EMC Symmetrix Subsystem Control I/O [S390] xpram: per device block request queues. [S390] dasd: fix message flood for unsolicited interrupts [S390] Move private simple udelay function to arch/s390/lib/delay.c. [S390] dcssblk: add >2G DCSSs support and stacked contiguous DCSSs support. [S390] ptrace changes [S390] s390: use sys_pause for 31bit pause entry point [S390] qdio enhanced SIGA (iqdio) support. [S390] cio: fix cio_tpi. [S390] cio: Correct use of ! and & [S390] cio: inline assembly cleanup [S390] bus_id -> dev_set_name() for css and ccw busses [S390] bus_id ->dev_name() conversions in qdio [S390] Use s390_root_dev_* in kvm_virtio. [S390] more bus_id -> dev_name conversions ...
| * [S390] Fix checkstack for s390Christian Borntraeger2008-10-10
| | | | | | | | | | | | | | | | | | With -march=z990 and later gcc can use the long displacement facility insruction lay for stack register handling. This patch adopts checkstack to catch lay in addition to ahi and aghi. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * [S390] fix initialization of stpMartin Schwidefsky2008-10-10
| | | | | | | | | | | | | | | | chsc_sstpc returns -EIO on error and 0 on success but stp_reset checks against 1 instead of 0. chsc_sstpc used to return 1 on success, one call location has not been updated .. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * [S390] 3215: Remove tasklet.Heiko Carstens2008-10-10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The 3215 console irq handler used to schedule a tasklet. However the console irq handler also gets called from the infamous cio_tpi() function. Which in turn does something like local_bh_disable() [call console irq handler] _local_bh_enable() _local_bh_enable() prevents execution of softirqs, which is intended within cio_tpi(). However there might be a new softirq pending because irq handler scheduled a tasklet. In order to prevent this behaviour we just get rid of the tasklet. It's not doing much anyway. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * [S390] console flush on panic / rebootHolger Smolinski2008-10-10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | The s390 console drivers use the unblank callback of the console structure to flush the console buffer. In case of a panic or a reboot the CPU doing the callback can block on the console i/o. The other CPUs in the system continue to work. For panic this is not a good idea. Replace the unblank callback with proper panic/reboot notifier. These get called after all but one CPU have been stopped. Signed-off-by: Holger Smolinski <Holger.Smolinski@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * [S390] introduce dirty bit for kvm live migrationFlorian Funke2008-10-10
| | | | | | | | | | | | | | | | | | | | | | | | This patch defines a dirty bit in the PGSTE that can be used to implement dirty pages logging for KVM's live migration. The bit is set in the ptep_rcp_copy function, which is called to save dirty and referenced information from the storage key in the PGSTE. The bit can be tested and reset by KVM using the kvm_s390_test_and_clear_page_dirty function that is introduced by this patch. Acked-by: Carsten Otte <cotte@de.ibm.com> Signed-off-by: Florian Funke <ffunke@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * [S390] Add ioctl support for EMC Symmetrix Subsystem Control I/ONigel Hislop2008-10-10
| | | | | | | | | | | | | | | | | | | | | | EMC Symmetrix Subsystem Control I/O through CKD dasd requires a specific parameter list sent to the array via a Perform Subsystem Function CCW. The Symmetrix response is retrieved from the array via a Read Subsystem Data CCW. Signed-off-by: Nigel Hislop <hislop_nigel@emc.com> Signed-off-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * [S390] xpram: per device block request queues.Martin Schwidefsky2008-10-10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The xpram driver uses a single block device queue for all of its devices so far. With recent kernels removing xpram module fails to clean up all sysfs files. The next time the xpram module is loaded you'll get warnings: WARNING: at fs/sysfs/dir.c:463 sysfs_add_one+0x5e/0x64() sysfs: duplicate filename '35:0' can not be created Modules linked in: xpram(+) [last unloaded: xpram] Followed by the usual WARN_ON output, followed by an error message from kobject_add_internal, followed by a badness in genhd. Allocating a block queue per device fixes this. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * [S390] dasd: fix message flood for unsolicited interruptsStefan Haberland2008-10-10
| | | | | | | | | | | | | | | | | | | | In the unsolicited interupt handler fake IRBs from CIO have to be ignored because there is nothing to do. The function dump_sense should not be called if there is no sense data available. Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * [S390] Move private simple udelay function to arch/s390/lib/delay.c.Heiko Carstens2008-10-10
| | | | | | | | | | | | | | | | | | Move cio's private simple udelay function to lib/delay.c and turn it into something much more readable. So we have all implementations at one place. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * [S390] dcssblk: add >2G DCSSs support and stacked contiguous DCSSs support.Hongjie Yang2008-10-10
| | | | | | | | | | | | | | | | | | | | The DCSS block device driver is modified to add >2G DCSSs support and allow a DCSS block device to map to a set of contiguous DCSSs. The extmem code is also modified to use new Diagnose x'64' subcodes for >2G DCSSs. Signed-off-by: Hongjie Yang <hongjie@us.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * [S390] ptrace changesMartin Schwidefsky2008-10-10
| | | | | | | | | | | | | | | | | | * System call parameter and result access functions * Add tracehook calls * Split syscall_trace into two functions do_syscall_trace_enter and do_syscall_trace_exit Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * [S390] s390: use sys_pause for 31bit pause entry pointChristoph Hellwig2008-10-10
| | | | | | | | | | | | | | | | sys32_pause is a useless copy of the generic sys_pause. (and it's certainly not there for old sparc32 binaries..) Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * [S390] qdio enhanced SIGA (iqdio) support.Klaus-Dieter Wacker2008-10-10
| | | | | | | | | | | | | | | | Add support for z10 HiperSockets multiwrite SBALs on output queues. This is used on LPAR with EDDP enabled devices. Signed-off-by: Klaus-Dieter Wacker <kdwacker@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * [S390] cio: fix cio_tpi.Heiko Carstens2008-10-10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In cio_tpi only disable bottom halves when not in interrupt context. Otherwise a WARN_ON gets triggered. Besides that, when we are in interrupt context bottom halves are disabled anyway. Fixes this one: Badness at kernel/softirq.c:77 Modules linked in: CPU: 2 Not tainted 2.6.26 #4 Process swapper (pid: 0, task: 000000003fe83db0, ksp: 000000003fea7d28) Krnl PSW : 0404c00180000000 0000000000053f4e (__local_bh_disable+0xbe/0xcc) R:0 T:1 IO:0 EX:0 Key:0 M:1 W:0 P:0 AS:3 CC:0 PM:0 EA:3 Krnl GPRS: 0000000000008ee0 00000000005f95e0 0000000000000000 0000000000000001 000000000020be92 0000000000000000 0000000000000210 00000000005d36c0 000000003fb5f4d8 0000000000000000 000000000020bed0 000000003fb5f3c8 00000000009be920 0000000000364898 000000003fb5f408 000000003fb5f3c8 Krnl Code: 0000000000053f42: bf2f1000 icm %r2,15,0(%r1) 0000000000053f46: a774ffc5 brc 7,53ed0 0000000000053f4a: a7f40001 brc 15,53f4c >0000000000053f4e: a7280001 lhi %r2,1 0000000000053f52: 50201000 st %r2,0(%r1) 0000000000053f56: a7f4ffbd brc 15,53ed0 0000000000053f5a: 0707 bcr 0,%r7 0000000000053f5c: a7f13fc0 tmll %r15,16320 Call Trace: ([<0000000000000210>] 0x210) [<0000000000053f86>] local_bh_disable+0x2a/0x38 [<000000000020bed0>] wait_cons_dev+0xd4/0x154 [<0000000000247cb2>] raw3215_make_room+0x6a/0x1a8 [<000000000024861a>] raw3215_write+0x86/0x28c [<00000000002488a0>] con3215_write+0x80/0x110 [<000000000004c3e0>] __call_console_drivers+0xc8/0xe4 [<000000000004c47e>] _call_console_drivers+0x82/0xc4 [<000000000004c744>] release_console_sem+0x218/0x2c0 [<000000000004cf64>] vprintk+0x3c0/0x504 [<0000000000354a4a>] printk+0x52/0x64 [<0000000000088004>] __print_symbol+0x40/0x50 [<0000000000071dbc>] print_stack_trace+0x78/0xac [<0000000000079e78>] print_lock_dependencies+0x148/0x208 [<000000000007a050>] print_irq_inversion_bug+0x118/0x15c [<000000000007a106>] check_usage_forwards+0x72/0x84 [<000000000007a36e>] mark_lock+0x1d2/0x594 [<000000000007baca>] __lock_acquire+0x886/0xf48 [<000000000007c234>] lock_acquire+0xa8/0xe0 [<0000000000350316>] _write_lock+0x56/0x98 [<000000000026cd92>] zfcp_erp_adapter_reopen+0x4e/0x8c [<000000000026f1e8>] zfcp_qdio_int_resp+0x2e4/0x2f4 [<00000000002210f4>] qdio_int_handler+0x274/0x888 [<00000000002177b6>] ccw_device_call_handler+0x6e/0xd8 [<0000000000215336>] ccw_device_irq+0xd6/0x160 [<0000000000212f88>] io_subchannel_irq+0x8c/0x118 [<000000000020c120>] do_IRQ+0x1d0/0x1fc [<00000000000270b2>] io_return+0x0/0x8 [<000000000001c8a4>] cpu_idle+0x178/0x21c ([<000000000001c884>] cpu_idle+0x158/0x21c) [<00000000003483a2>] start_secondary+0xb6/0xc8 INFO: lockdep is turned off. Last Breaking-Event-Address: [<0000000000053f4a>] __local_bh_disable+0xba/0xcc Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * [S390] cio: Correct use of ! and &Julia Lawall2008-10-10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In commit e6bafba5b4765a5a252f1b8d31cbf6d2459da337, a bug was fixed that involved converting !x & y to !(x & y). The code below shows the same pattern, and thus should perhaps be fixed in the same way. In particular, the result of !scsw_stctl(&request->irb.scsw) & SCSW_STCTL_STATUS_PEND is always just !scsw_stctl(&request->irb.scsw). The semantic patch that makes this change is as follows: (http://www.emn.fr/x-info/coccinelle/) // <smpl> @@ expression E; constant C; @@ ( !E & !C | - !E & C + !(E & C) ) // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * [S390] cio: inline assembly cleanupPeter Oberparleiter2008-10-10
| | | | | | | | | | | | | | | | | | Fix incorrect in- and output constraints, remove volatile declaration of inline assembly parameters and reformat constraint declarations to be more consistent. Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * [S390] bus_id -> dev_set_name() for css and ccw bussesCornelia Huck2008-10-10
| | | | | | | | | | | | | | | | | | Convert remaining s390 users setting bus_id to dev_set_name() or init_name. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * [S390] bus_id ->dev_name() conversions in qdioMartin Schwidefsky2008-10-10
| | | | | | | | | | | | | | Use dev_name() in the new qdio driver. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * [S390] Use s390_root_dev_* in kvm_virtio.Cornelia Huck2008-10-10
| | | | | | | | | | | | | | | | | | | | | | | | | | No need to define a static device for the kvm_s390 root device, just use s390_root_dev_register(). This is needed for the bus_id rework Acked-by: Carsten Otte <cotte@de.ibm.com> Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * [S390] more bus_id -> dev_name conversionsCornelia Huck2008-10-10
| | | | | | | | | | | | | | | | | | Some further bus_id -> dev_name() conversions in s390 code. Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * [S390] bus_id -> dev_set_name() changesCornelia Huck2008-10-10
| | | | | | | | | | | | | | | | | | | | Convert most s390 users setting bus_id to dev_set_name(). css and ccw busses are deferred since they need some special treatment. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * [S390] bus_id -> dev_name conversionsKay Sievers2008-10-10
| | | | | | | | | | | | | | | | | | | | bus_id -> dev_name() conversions in s390 code. [cornelia.huck@de.ibm.com: minor adaptions] Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Cc: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * [S390] cio: Exorcise cio_msg= from documentation.Cornelia Huck2008-10-10
| | | | | | | | | | Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * [S390] cio: Update cio_ignore documentation.Cornelia Huck2008-10-10
| | | | | | | | | | | | | | Add documentation for the new "purge" cio_ignore parameter. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * [S390] cio: introduce purge function for /proc/cio_ignorePeter Oberparleiter2008-10-10
| | | | | | | | | | | | | | | | | | | | | | | | Allow users to remove blacklisted ccw devices by using the /proc/cio_ignore interface: echo purge > /proc/cio_ignore will remove all devices which are offline and blacklisted. Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * [S390] cio: move device unregistration to dedicated work queuePeter Oberparleiter2008-10-10
| | | | | | | | | | | | | | | | | | Use dedicated slow path work queue when unregistering a device due to a user action. This ensures serialialization of other register/ unregister requests. Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * [S390] qdio: speed up multicast traffic on full HiperSocket queueUrsula Braun2008-10-10
| | | | | | | | | | | | | | | | | | | | | | | | | | If an asynchronous HiperSockets queue runs full, no further packet can be sent. In this case the next initiative to give transmitted skbs back to the stack is triggered only by a 10-seconds qdio timer. This timer has been introduced for low multicast traffic scenarios to guarantee freeing of skbs in a limited amount of time. For high HiperSocket multicast traffic scenarios progress checking on the outbound queue should be enforced by tasklet rescheduling. Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* | Merge branch 'next' of ↵Linus Torvalds2008-10-11
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq * 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq: [CPUFREQ] Fix BUG: using smp_processor_id() in preemptible code [CPUFREQ] Don't export governors for default governor [CPUFREQ][6/6] cpufreq: Add idle microaccounting in ondemand governor [CPUFREQ][5/6] cpufreq: Changes to get_cpu_idle_time_us(), used by ondemand governor [CPUFREQ][4/6] cpufreq_ondemand: Parameterize down differential [CPUFREQ][3/6] cpufreq: get_cpu_idle_time() changes in ondemand for idle-microaccounting [CPUFREQ][2/6] cpufreq: Change load calculation in ondemand for software coordination [CPUFREQ][1/6] cpufreq: Add cpu number parameter to __cpufreq_driver_getavg() [CPUFREQ] use deferrable delayed work init in conservative governor [CPUFREQ] drivers/cpufreq/cpufreq.c: Adjust error handling code involving cpufreq_cpu_put [CPUFREQ] add error handling for cpufreq_register_governor() error [CPUFREQ] acpi-cpufreq: add error handling for cpufreq_register_driver() error [CPUFREQ] Coding style fixes to arch/x86/kernel/cpu/cpufreq/powernow-k6.c [CPUFREQ] Coding style fixes to arch/x86/kernel/cpu/cpufreq/elanfreq.c
| * | [CPUFREQ] Fix BUG: using smp_processor_id() in preemptible codeAndrea Righi2008-10-09
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Use get_cpu()/put_cpu() in cpufreq_ondemand init routine, instead of smp_processor_id() to avoid the following BUG: [ 35.313118] BUG: using smp_processor_id() in preemptible [00000000] code=: modprobe/4952 [ 35.313132] caller is cpufreq_gov_dbs_init+0xa/0x8f [cpufreq_ondemand] [ 35.313140] Pid: 4952, comm: modprobe Not tainted 2.6.27-rc5-mm1 #23 [ 35.313145] Call Trace: [ 35.313158] [<ffffffff80361ff7>] debug_smp_processor_id+0xd7/0xe0 [ 35.313167] [<ffffffffa010800a>] cpufreq_gov_dbs_init+0xa/0x8f [cpufreq_ondemand] [ 35.313176] [<ffffffff8020903b>] _stext+0x3b/0x160 [ 35.313185] [<ffffffff804768c5>] __mutex_unlock_slowpath+0xe5/0x190 [ 35.313195] [<ffffffff8026236a>] trace_hardirqs_on_caller+0xca/0x140 [ 35.313205] [<ffffffff8026ef4c>] sys_init_module+0xdc/0x210 [ 35.313212] [<ffffffff8020b7cb>] system_call_fastpath+0x16/0x1b Signed-off-by: Andrea Righi <righi.andrea@gmail.com> Signed-off-by: Dave Jones <davej@redhat.com>
| * | [CPUFREQ] Don't export governors for default governorSven Wegener2008-10-09
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We don't need to export the governors for use as the default governor, because the default governor will be built-in anyway and we can access the symbol directly. This also fixes the following sparse warnings: drivers/cpufreq/cpufreq_conservative.c:578:25: warning: symbol 'cpufreq_gov_conservative' was not declared. Should it be static? drivers/cpufreq/cpufreq_ondemand.c:582:25: warning: symbol 'cpufreq_gov_ondemand' was not declared. Should it be static? drivers/cpufreq/cpufreq_performance.c:39:25: warning: symbol 'cpufreq_gov_performance' was not declared. Should it be static? drivers/cpufreq/cpufreq_powersave.c:38:25: warning: symbol 'cpufreq_gov_powersave' was not declared. Should it be static? drivers/cpufreq/cpufreq_userspace.c:190:25: warning: symbol 'cpufreq_gov_userspace' was not declared. Should it be static? Signed-off-by: Sven Wegener <sven.wegener@stealer.net> Signed-off-by: Dave Jones <davej@redhat.com>
| * | [CPUFREQ][6/6] cpufreq: Add idle microaccounting in ondemand governorvenkatesh.pallipadi@intel.com2008-10-09
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Use get_cpu_idle_time_us() to get micro-accounted idle information. This enables ondemand to get more accurate idle and busy timings than the jiffy based calculation. As a result, we can decrease the ondemand safety gaurd band from 80-10 to 95-3. Results in more aggressive power savings. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Dave Jones <davej@redhat.com>
| * | [CPUFREQ][5/6] cpufreq: Changes to get_cpu_idle_time_us(), used by ondemand ↵venkatesh.pallipadi@intel.com2008-10-09
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | governor export get_cpu_idle_time_us() for it to be used in ondemand governor. Last update time can be current time when the CPU is currently non-idle, accounting for the busy time since last idle. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Dave Jones <davej@redhat.com>
| * | [CPUFREQ][4/6] cpufreq_ondemand: Parameterize down differentialvenkatesh.pallipadi@intel.com2008-10-09
| | | | | | | | | | | | | | | | | | | | | | | | | | | Use a parameter for down differential, instead of hardcoded 10%. Follow-on patch changes the down-differential dynamically, based on whether we are using idle micro-accounting or not. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Dave Jones <davej@redhat.com>
| * | [CPUFREQ][3/6] cpufreq: get_cpu_idle_time() changes in ondemand for ↵venkatesh.pallipadi@intel.com2008-10-09
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | idle-microaccounting Preparatory changes for doing idle micro-accounting in ondemand governor. get_cpu_idle_time() gets extra parameter and returns idle time and also the wall time that corresponds to the idle time measurement. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Dave Jones <davej@redhat.com>
| * | [CPUFREQ][2/6] cpufreq: Change load calculation in ondemand for software ↵venkatesh.pallipadi@intel.com2008-10-09
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | coordination Change the load calculation algorithm in ondemand to work well with software coordination of frequency across the dependent cpus. Multiply individual CPU utilization with the average freq of that logical CPU during the measurement interval (using getavg call). And find the max CPU utilization number in terms of CPU freq. That number is then used to get to the target freq for next sampling interval. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Dave Jones <davej@redhat.com>
| * | [CPUFREQ][1/6] cpufreq: Add cpu number parameter to __cpufreq_driver_getavg()venkatesh.pallipadi@intel.com2008-10-09
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add a cpu parameter to __cpufreq_driver_getavg(). This is needed for software cpufreq coordination where policy->cpu may not be same as the CPU on which we want to getavg frequency. A follow-on patch will use this parameter to getavg freq from all cpus in policy->cpus. Change since last patch. Fix the offline/online and suspend/resume oops reported by Youquan Song <youquan.song@intel.com> Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Dave Jones <davej@redhat.com>
| * | [CPUFREQ] use deferrable delayed work init in conservative governorBen Slusky2008-10-09
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Venki Pallipadi made a similar change to the ondemand governor a while back (in commit 28287033e12463c8ff89f1ea8038783d0360391c). It seems to work just as well in the conservative governor, leading to fewer wakeups as reported by powertop. Signed-off-by: Ben Slusky <sluskyb@paranoiacs.org> Signed-off-by: Dave Jones <davej@redhat.com>
| * | [CPUFREQ] drivers/cpufreq/cpufreq.c: Adjust error handling code involving ↵Julia Lawall2008-10-09
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | cpufreq_cpu_put After calling cpufreq_cpu_get, error handling code should call cpufreq_cpu_put. The semantic match that finds this problem is as follows: (http://www.emn.fr/x-info/coccinelle/) // <smpl> @r@ expression x,E; statement S; position p1,p2,p3; @@ ( if ((x = cpufreq_cpu_get@p1(...)) == NULL || ...) S | x = cpufreq_cpu_get@p1(...) ... when != x if (x == NULL || ...) S ) <... if@p3 (...) { ... when != cpufreq_cpu_put(x) when != if (x) { ... cpufreq_cpu_put(x); ...} return@p2 ...; } ...> ( return x; | return 0; | x = E | E = x | cpufreq_cpu_put(x) ) @exists@ position r.p1,r.p2,r.p3; expression x; int ret != 0; statement S; @@ * x = cpufreq_cpu_get@p1(...) <... * if@p3 (...) S ...> * return@p2 \(NULL\|ret\); // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: Dave Jones <davej@redhat.com>
| * | [CPUFREQ] add error handling for cpufreq_register_governor() errorAkinobu Mita2008-10-09
| | | | | | | | | | | | | | | | | | | | | | | | Add error handling for cpufreq_register_governor() error Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Cc: cpufreq@lists.linux.org.uk Signed-off-by: Dave Jones <davej@redhat.com>
| * | [CPUFREQ] acpi-cpufreq: add error handling for cpufreq_register_driver() errorAkinobu Mita2008-10-09
| | | | | | | | | | | | | | | | | | | | | | | | add error handling for cpufreq_register_driver() error Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Cc: cpufreq@lists.linux.org.uk Signed-off-by: Dave Jones <davej@redhat.com>
| * | [CPUFREQ] Coding style fixes to arch/x86/kernel/cpu/cpufreq/powernow-k6.cPaolo Ciarrocchi2008-10-09
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Before: total: 11 errors, 15 warnings, 255 lines checked After: total: 0 errors, 6 warnings, 254 lines checked paolo@paolo-desktop:~/linux.trees.git$ md5sum /tmp/powernow-k6.o.* 476932f5e1ffe365db9d1dfb3f860369 /tmp/powernow-k6.o.after 476932f5e1ffe365db9d1dfb3f860369 /tmp/powernow-k6.o.before Signed-off-by: Paolo Ciarrocchi <paolo.ciarrocchi@gmail.com> Signed-off-by: Dave Jones <davej@redhat.com>
| * | [CPUFREQ] Coding style fixes to arch/x86/kernel/cpu/cpufreq/elanfreq.cPaolo Ciarrocchi2008-10-09
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Before: total: 15 errors, 10 warnings, 308 lines checked After: total: 0 errors, 4 warnings, 308 lines checked paolo@paolo-desktop:~/linux.trees.git$ md5sum /tmp/elafreq.o.* add1d36c2f077c5aab7682e8642a9f34 /tmp/elafreq.o.after add1d36c2f077c5aab7682e8642a9f34 /tmp/elafreq.o.before paolo@paolo-desktop:~/linux.trees.git$ size /tmp/elafreq.o.* text data bss dec hex filename 934 270 4 1208 4b8 /tmp/elafreq.o.after 934 270 4 1208 4b8 /tmp/elafreq.o.before Signed-off-by: Paolo Ciarrocchi <paolo.ciarrocchi@gmail.com> Signed-off-by: Dave Jones <davej@redhat.com>
* | | Merge branch 'rcu-v28-for-linus' of ↵Linus Torvalds2008-10-10
|\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'rcu-v28-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (21 commits) rcu: RCU-based detection of stalled CPUs for Classic RCU, fix rcu: RCU-based detection of stalled CPUs for Classic RCU rcu: add rcu_read_lock_sched() / rcu_read_unlock_sched() rcu: fix sparse shadowed variable warning doc/RCU: fix pseudocode in rcuref.txt rcuclassic: fix compiler warning rcu: use irq-safe locks rcuclassic: fix compilation NG rcu: fix locking cleanup fallout rcu: remove redundant ACCESS_ONCE definition from rcupreempt.c rcu: fix classic RCU locking cleanup lockdep problem rcu: trace fix possible mem-leak rcu: just rename call_rcu_bh instead of making it a macro rcu: remove list_for_each_rcu() rcu: fixes to include/linux/rcupreempt.h rcu: classic RCU locking and memory-barrier cleanups rcu: prevent console flood when one CPU sees another AWOL via RCU rcu, debug: detect stalled grace periods, cleanups rcu, debug: detect stalled grace periods rcu classic: new algorithm for callbacks-processing(v2) ...
| * | | Merge branch 'linus' into core/rcuIngo Molnar2008-10-08
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| * | | rcu: RCU-based detection of stalled CPUs for Classic RCU, fixIngo Molnar2008-10-03
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | fix the !CONFIG_RCU_CPU_STALL_DETECTOR path: kernel/rcuclassic.c: In function '__rcu_pending': kernel/rcuclassic.c:609: error: too few arguments to function 'check_cpu_stall' Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | | rcu: RCU-based detection of stalled CPUs for Classic RCUPaul E. McKenney2008-10-03
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds stalled-CPU detection to Classic RCU. This capability is enabled by a new config variable CONFIG_RCU_CPU_STALL_DETECTOR, which defaults disabled. This is a debugging feature to detect infinite loops in kernel code, not something that non-kernel-hackers would be expected to care about. This feature can detect looping CPUs in !PREEMPT builds and looping CPUs with preemption disabled in PREEMPT builds. This is essentially a port of this functionality from the treercu patch, replacing the stall debug patch that is already in tip/core/rcu (commit 67182ae1c4). The changes from the patch in tip/core/rcu include making the config variable name match that in treercu, changing from seconds to jiffies to avoid spurious warnings, and printing a boot message when this feature is enabled. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | | Merge commit 'v2.6.27-rc8' into core/rcuIngo Molnar2008-10-03
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| * | | | rcu: add rcu_read_lock_sched() / rcu_read_unlock_sched()Mathieu Desnoyers2008-09-30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add rcu_read_lock_sched() and rcu_read_unlock_sched() to rcupdate.h to match the recently added write-side call_rcu_sched() and rcu_barrier_sched(). They also match the no-so-recently-added synchronize_sched(). It will help following matching use of the update/read lock primitives. Those new read lock will replace preempt_disable()/enable() used in pair with RCU-classic synchronization. Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Acked-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | | | rcu: fix sparse shadowed variable warningHarvey Harrison2008-09-23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | kernel/rcuclassic.c:564:18: warning: symbol 'flags' shadows an earlier one kernel/rcuclassic.c:527:16: originally declared here Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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