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* powerpc: Fix find_next_bit on 32-bitPaul Mackerras2005-11-101-1/+1
| | | | | | | We had a "64" that didn't get changed to BITS_PER_LONG, resulting in find_next_bit not working correctly. Signed-off-by: Paul Mackerras <paulus@samba.org>
* ppc/powerpc: workarounds for old Open Firmware versionsPaul Mackerras2005-11-108-83/+295
| | | | | | | | | | | | | | This adds code to work around some problems with old versions of Open Firmware, such as on the early powermacs (7500 etc.) and the "Longtrail" CHRP machine. On these machines we have to claim the physical and virtual address ranges explicitly when claiming memory and then set up a V->P mapping. The Longtrail has more problems: setprop doesn't work, and we have to set an "allow-reclaim" variable to 0 in order to get claim on physical memory ranges to fail if the memory is already claimed. Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] ppc64: Save & restore of PCI device BARSLinas Vepstas2005-11-101-1/+114
| | | | | | | | | | | | | | | | | 14-eeh-device-bar-save.patch After a PCI device has been resest, the device BAR's and other config space info must be restored to the same state as they were in when the firmware first handed us this device. This will allow the PCI device driver, when restarted, to correctly recognize and set up the device. Tis patch saves the device config space as early as reasonable after the firmware has handed over the device. Te state resore funcion is inteded for use by the EEH recovery routines. Signed-off-by: Linas Vepstas <linas@austin.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] ppc64: PCI reset support routinesLinas Vepstas2005-11-101-0/+99
| | | | | | | | | | | | | | 13-eeh-recovery-support-routines.patch EEH Recovery support routines This patch adds routines required to help drive the recovery of EEH-frozen slots. The main function is to drive the PCI #RST signal line high for a qurter of a second, and then allow for a second & a half of settle time. Signed-off-by: Linas Vepstas <linas@austin.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] ppc64: PCI error event dispatcherLinas Vepstas2005-11-103-124/+171
| | | | | | | | | | | | | | | | | | | | | | | 12-eeh-event-dispatcher.patch ppc64: EEH Recovery dispatcher thread This patch adds a mechanism to create recovery threads when an EEH event is received. Since an EEH freeze state may be detected within an interrupt context, we need to get out of the interrupt context before starting recovery. This dispatcher does this in two steps: first, it uses a workqueue to get out, and then lanuches a kernel thread, so that the recovery routine can sleep for exteded periods without upseting the keventd. A kernel thread is created with each EEH event, rather than having one long-running daemon started at boot time. This is because it is anticipated that EEH events will be very rare (very very rare, ideally) and so its pointless to cluter the process tables with a daemon that will almost never run. Signed-off-by: Linas Vepstas <linas@austin.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] ppc64: move eeh.c to powerpc directory from ppc64Linas Vepstas2005-11-103-1/+1
| | | | | | | | | | 11-eeh-move-to-powerpc.patch Move arch/ppc64/kernel/eeh.c to arch//powerpc/platforms/pseries/eeh.c No other changes (except for Makefile to build it) Signed-off-by: Linas Vepstas <linas@austin.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] ppc64: bugfix: don't silently ignore PCI errorsLinas Vepstas2005-11-101-2/+3
| | | | | | | | | | | 10-EEH-enable-bugfix.patch Bugfix: With the curent linux-2.6.14-rc2-git6, EEH errors are ignored because thier detection requires an unused, uninitialized flag to be set. This patch removes the unused flag. Signed-off-by: Linas Vepstas <linas@austin.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] ppc64: bugfix: crash on PCI hotplugLinas Vepstas2005-11-101-4/+17
| | | | | | | | | | | | | | | | | | | | | | | 09-hotplug-bugfix.patch In the current 2.6.14-rc2-git6 kernel, performing a Dynamic LPAR Add of a hotplug slot will crash the system, with the following (abbreviated) stack trace: cpu 0x3: Vector: 700 (Program Check) at [c000000053dff7f0] pc: c0000000004f5974: .__alloc_bootmem+0x0/0xb0 lr: c0000000000258a0: .update_dn_pci_info+0x108/0x118 c0000000000257c8 .update_dn_pci_info+0x30/0x118 (unreliable) c0000000000258fc .pci_dn_reconfig_notifier+0x4c/0x64 c000000000060754 .notifier_call_chain+0x68/0x9c The root cause was that __init __alloc_bootmem() was called long after boot had finished, resulting in a crash because this routine is undefined after boot time. The patch below fixes this crash, and adds some docs to clarify the code. Signed-off-by: Linas Vepstas <linas@austin.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] ppc64: escape hatch for spinning interrupt deadlocksLinas Vepstas2005-11-101-8/+13
| | | | | | | | | | | | | 08-eeh-spin-counter.patch One an EEH event is triggers, all further I/O to a device is blocked (until reset). Bad device drivers may end up spinning in their interrupt handlers, trying to read an interrupt status register that will never change state. This patch moves that spin counter to a per-device structure, and adds some diagnostic prints to help locate the bad driver. Signed-off-by: Linas Vepstas <linas@linas.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] ppc64: serialize reports of PCI errorsLinas Vepstas2005-11-101-13/+85
| | | | | | | | | | | | | | 07-eeh-report-race.patch When a PCI slot is isolated, all PCI functions under that slot are affected. If hese functions have separate device drivers, the EEH isolation event might be reported multiple times. This patch adds a lock to prevent the racing of such multiple reports. It also marks every device under the slot as having experienced an EEH event, so that multiple reports may be recognized more easily. Signed-off-by: Linas Vepstas <linas@linas.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] ppc64: avoid PCI error reporting for empty slotsLinas Vepstas2005-11-101-2/+27
| | | | | | | | | | 06-eeh-empty-slot-error.patch Performing PCI config-space reads to empty PCI slots can lead to reports of "permanent failure" from the firmware. Ignore permanent failures on empty slots. Signed-off-by: Linas Vepstas <linas@linas.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] ppc64: RTAS error reporting restructuringLinas Vepstas2005-11-101-16/+30
| | | | | | | | | | 05-eeh-slot-error-detail.patch This patch encapsulates a section of code that reports the EEH event. The new subroutine can be used in several places to report the error. Signed-off-by: Linas Vepstas <linas@linas.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] ppc64: PCI error rate statisticsLinas Vepstas2005-11-101-11/+32
| | | | | | | | | | | | 04-eeh-statistics.patch This minor patch adds some statistics-gathering counters that allow the behaviour of the EEH subsystem o be monitored. While far from perfect, it does provide a rudimentary device that makes understanding of the current state of the system a bit easier. Signed-off-by: Linas Vepstas <linas@linas.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] ppc64: PCI address cache minor fixesLinas Vepstas2005-11-101-7/+26
| | | | | | | | | | | | | | | 03-eeh-addr-cache-cleanup.patch This is a minor patch to clean up a buglet related to the PCI address cache. (The buglet doesn't manifes itself unless there are also bugs elsewhere, which is why its minor.). Also: -- Improved debug printing. -- Declare some private routines as static -- Adds reference counting to struct pci_dn->pcidev structure Signed-off-by: Linas Vepstas <linas@linas.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] ppc64: misc minor cleanupLinas Vepstas2005-11-101-28/+25
| | | | | | | | | | | | | | 02-eeh-minor-cleanup.patch This patch performs some minor cleanup of the eeh.c file, including: -- trim some trailing whitespace -- remove extraneous #includes -- use the macro PCI_DN uniformly, instead of the void pointer chase. -- typos in comments -- improved debug printk's Signed-off-by: Linas Vepstas <linas@linas.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] ppc64: uniform usage of bus unit id interfaceslinas2005-11-102-27/+24
| | | | | | | | | | | | | 01-pci-dn-uniformization.patch This patch changes the rtas_pci interface to use the new struct pci_dn structure for two routines that work with pci device nodes. This patch also does some minor janitorial work: it uses some handy macros and cleans up some trailing whitespace in the affected file. Signed-off-by: Linas Vepstas <linas@austin.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] ppc64: Don't panic when early __ioremap failsBenjamin Herrenschmidt2005-11-101-2/+5
| | | | | | | | | | | Early calls to __ioremap() will panic if the hash insertion fails. This patch makes them return NULL instead. It happens with some pSeries users who enabled CONFIG_BOOTX_TEXT. The later is getting an incorrect address for the fame buffer and the hash insertion fails. With this patch, it will display an error instead of crashing at boot. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] ppc64 boot: fix compile warningsOlaf Hering2005-11-101-4/+4
| | | | | | | | | | | | Fix a few compile warnings arch/ppc64/boot/addRamDisk.c:166: warning: int format, long unsigned int arg (arg 2) arch/ppc64/boot/addRamDisk.c:170: warning: int format, long unsigned int arg (arg 2) arch/ppc64/boot/addRamDisk.c:265: warning: unsigned int format, long unsigned int arg (arg 2) arch/ppc64/boot/addRamDisk.c:302: warning: unsigned int format, long unsigned int arg (arg 3) Signed-off-by: Olaf Hering <olh@suse.de> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] ppc64 boot: remove sysmap from required filenamesOlaf Hering2005-11-101-62/+69
| | | | | | | | | | | | | | | A stripped vmlinux does not contain enough symbols to recreate the System.map. The System.map file is only used to determine the end of the runtime memory size. This is the same value (rounded up to PAGE_SIZE) as ->memsiz in the ELF program header. Also, the target vmlinux.initrd doesnt work in 2.6.14: arch/ppc64/boot/addRamDisk arch/ppc64/boot/ramdisk.image.gz vmlinux.strip arch/ppc64/boot/vmlinux.initrd Name of vmlinux output file missing. Signed-off-by: Olaf Hering <olh@suse.de> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] ppc64 boot: remove argv usageOlaf Hering2005-11-101-14/+18
| | | | | | | Use a local variable for the input filenames. Signed-off-by: Olaf Hering <olh@suse.de> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] ppc64 boot: remove local initializersOlaf Hering2005-11-101-28/+28
| | | | | | | | Remove initialization of local variables. They get all values assigned before use. Signed-off-by: Olaf Hering <olh@suse.de> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] ppc32: fix ppc44x fpu buildMatt Porter2005-11-101-1/+1
| | | | | | | | | Fixes ppc44x fpu support that broke from a bad arch/powerpc merge. Instead of adding KernelFP back in (which duplicates code) we use the same kernel fpu unavailable handler as classic PPC processors. Signed-off-by: Matt Porter <mporter@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] powerpc: Move various ppc64 files with no ppc32 equivalent to powerpcDavid Gibson2005-11-106-16/+14
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch moves a bunch of files from arch/ppc64 and include/asm-ppc64 which have no equivalents in ppc32 code into arch/powerpc and include/asm-powerpc. The file affected are: abs_addr.h compat.h lppaca.h paca.h tce.h cpu_setup_power4.S ioctl32.c firmware.c pacaData.c The only changes apart from the move and corresponding Makefile changes are: - #ifndef/#define in includes updated to _ASM_POWERPC_ form - trailing whitespace removed - comments giving full paths removed - pacaData.c renamed paca.c to remove studlyCaps - Misplaced { moved in lppaca.h Built and booted on POWER5 LPAR (ARCH=powerpc and ARCH=ppc64), built for 32-bit powermac (ARCH=powerpc). Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
* [PATCH] powerpc: Merge signal.hDavid Gibson2005-11-103-2/+3
| | | | | | | | | | | | | | | | | | | Having already merged the ppc and ppc64 versions of signal.c, this patch finishes the job by merging signal.h. The two versions were almost identical already. Notable changes: - We use BITS_PER_LONG to correctly size sigset_t - Remove some uneeded #includes and struct forward declarations. This does mean adding an include to signal_32.c which relied on the indirect inclusion of sigcontext.h - As the ppc64 version, the merged signal.h has prototypes for do_signal() and do_signal32(). Thus remove extra prototypes from ppc_ksyms.c which had them directly. Built and booted on POWER5 LPAR (ARCH=ppc64 and ARCH=powerpc). Built for 32-bit powermac (ARCH=ppc and ARCH=powerpc) and Walnut (ARCH=ppc). Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
* Merge ../linux-2.6Paul Mackerras2005-11-10130-1230/+2078
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| * [SPARC] sbus rtc: implement ->compat_ioctlChristoph Hellwig2005-11-091-2/+0
| | | | | | | | | | Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: David S. Miller <davem@davemloft.net>
| * [SPARC64]: Use ARRAY_SIZE macroTobias Klauser2005-11-093-5/+3
| | | | | | | | | | | | | | | | Use ARRAY_SIZE macro instead of sizeof(x)/sizeof(x[0]) and remove a duplicate of ARRAY_SIZE which is never used anyways. Signed-off-by: Tobias Klauser <tklauser@nuerscht.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
| * [SPARC]: Use ARRAY_SIZE macroTobias Klauser2005-11-093-5/+3
| | | | | | | | | | | | | | | | Use ARRAY_SIZE macro instead of sizeof(x)/sizeof(x[0]) and remove a duplicate of ARRAY_SIZE which is never used anyways. Signed-off-by: Tobias Klauser <tklauser@nuerscht.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
| * Merge master.kernel.org:/home/rmk/linux-2.6-armLinus Torvalds2005-11-0911-18/+354
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| | * [ARM] Clean up save_and_disable_irqs macro and allow use of ARMv6 CPSIDRussell King2005-11-091-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | save_and_disable_irqs does not need to use mov + msr (which was introduced to work around a documentation bug which was propagated into binutils.) Use msr with an immediate constant, and if we're building for ARMv6 or later, use the new CPSID instruction. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| | * Merge with ARM SMP treeRussell King2005-11-096-2/+277
| | |\
| | | * [ARM SMP] Add CPU hotplug support for Realview MPcoreRussell King2005-11-092-0/+139
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Add platform specific parts for hotplug CPU support for the Realview board. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| | | * [ARM SMP] Add local timer support for Realview MPcoreRussell King2005-11-095-2/+138
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Add platform specific parts for local timer support for the Realview board. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| | * | [ARM] 3100/1: simplify a pointer computationNicolas Pitre2005-11-091-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Patch from Nicolas Pitre Looks clearer this way. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| | * | [ARM] 3138/1: SMDK2440 - fix map_desc initialisation (and ISA memory space)Ben Dooks2005-11-091-2/+21
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Patch from Ben Dooks Fix the map_desc initialisers for the SMDK2440 machine to use the new .pfn method, and at the same time making the differntiation between ISA IO and Memory space accesses Signed-off-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| | * | [ARM] 3137/1: RX3715 - fix map_desc initialiserBen Dooks2005-11-091-2/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Patch from Ben Dooks Change the initialiser for the map_desc for the iPAQ RX3715 to use the new pfn initialiser, and also reduce the amount of ISA space mapped (we only need to stop any ISA IO writes OOPsing the system, so do not need >1Mbyte of space) Signed-off-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| | * | [ARM] 3136/1: Anubis - fix map_desc initialisersBen Dooks2005-11-091-9/+42
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Patch from Ben Dooks Fix the map_desc initialisers for the Simtec Anubis board to match the new initialiser scheme. Signed-off-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| * | | Merge branch 'upstream-linus' of ↵Linus Torvalds2005-11-092-60/+11
| |\ \ \ | | | | | | | | | | | | | | | master.kernel.org:/pub/scm/linux/kernel/git/jgarzik/netdev-2.6
| | * | | [PATCH] uml_net: use ethtool_opsChristoph Hellwig2005-11-091-27/+11
| | | | | | | | | | | | | | | | | | | | | | | | | Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
| | * | | [PATCH] xtensa platform-iss network: remove no-op ioctl handlerChristoph Hellwig2005-11-091-33/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If the driver ever wants to add ethtool support it should use ethtool_ops. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
| * | | | Merge branch 'release' of ↵Linus Torvalds2005-11-093-4/+5
| |\ \ \ \ | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6
| | * | | | [IA64] altix: misc pci interrupt related fixesMark Maule2005-11-082-3/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Fix a couple of altix interrupt related bugs. Signed-off-by: Mark Maule <maule@sgi.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
| | * | | | [IA64] MCA recovery: Bump reference count on bad pagesRuss Anderson2005-11-081-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When a page has a memory uncorrectable ECC error, the recovery code wants to prevent the page from being reused. This change bumps the reference count to prevent the page from getting back on the free list. Signed-off-by: Russ Anderson (rja@sgi.com) Signed-off-by: Tony Luck <tony.luck@intel.com>
| | * | | | [IA64] MCA recovery: pfn_valid() needs a pfnRuss Anderson2005-11-081-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | paddr needs to be shifted by PAGE_SHIFT to be valid input for pfn_valid(). Signed-off-by: Russ Anderson <rja@sgi.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
| * | | | | [PATCH] i386: EXPORT_SYMBOL(screen_info) even #ifndef CONFIG_VTAdrian Bunk2005-11-091-2/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The folllowing modules require screen_info but don't depend on CONFIG_VT: - vga16fb.ko - intelfb.ko Signed-off-by: Adrian Bunk <bunk@stusta.de> Acked-by: "Antonino A. Daplas" <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| * | | | | [PATCH] fbdev: Remove remains of epson1356fbRalf Baechle2005-11-096-16/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Delete leftovers of the FB_E1356 and anything that did depend on it. Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| * | | | | [PATCH] sched: resched and cpu_idle reworkNick Piggin2005-11-0917-199/+170
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Make some changes to the NEED_RESCHED and POLLING_NRFLAG to reduce confusion, and make their semantics rigid. Improves efficiency of resched_task and some cpu_idle routines. * In resched_task: - TIF_NEED_RESCHED is only cleared with the task's runqueue lock held, and as we hold it during resched_task, then there is no need for an atomic test and set there. The only other time this should be set is when the task's quantum expires, in the timer interrupt - this is protected against because the rq lock is irq-safe. - If TIF_NEED_RESCHED is set, then we don't need to do anything. It won't get unset until the task get's schedule()d off. - If we are running on the same CPU as the task we resched, then set TIF_NEED_RESCHED and no further action is required. - If we are running on another CPU, and TIF_POLLING_NRFLAG is *not* set after TIF_NEED_RESCHED has been set, then we need to send an IPI. Using these rules, we are able to remove the test and set operation in resched_task, and make clear the previously vague semantics of POLLING_NRFLAG. * In idle routines: - Enter cpu_idle with preempt disabled. When the need_resched() condition becomes true, explicitly call schedule(). This makes things a bit clearer (IMO), but haven't updated all architectures yet. - Many do a test and clear of TIF_NEED_RESCHED for some reason. According to the resched_task rules, this isn't needed (and actually breaks the assumption that TIF_NEED_RESCHED is only cleared with the runqueue lock held). So remove that. Generally one less locked memory op when switching to the idle thread. - Many idle routines clear TIF_POLLING_NRFLAG, and only set it in the inner most polling idle loops. The above resched_task semantics allow it to be set until before the last time need_resched() is checked before going into a halt requiring interrupt wakeup. Many idle routines simply never enter such a halt, and so POLLING_NRFLAG can be always left set, completely eliminating resched IPIs when rescheduling the idle task. POLLING_NRFLAG width can be increased, to reduce the chance of resched IPIs. Signed-off-by: Nick Piggin <npiggin@suse.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: Con Kolivas <kernel@kolivas.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| * | | | | [PATCH] sched: disable preempt in idle tasksNick Piggin2005-11-0935-42/+122
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Run idle threads with preempt disabled. Also corrected a bugs in arm26's cpu_idle (make it actually call schedule()). How did it ever work before? Might fix the CPU hotplugging hang which Nigel Cunningham noted. We think the bug hits if the idle thread is preempted after checking need_resched() and before going to sleep, then the CPU offlined. After calling stop_machine_run, the CPU eventually returns from preemption and into the idle thread and goes to sleep. The CPU will continue executing previous idle and have no chance to call play_dead. By disabling preemption until we are ready to explicitly schedule, this bug is fixed and the idle threads generally become more robust. From: alexs <ashepard@u.washington.edu> PPC build fix From: Yoichi Yuasa <yuasa@hh.iij4u.or.jp> MIPS build fix Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Yoichi Yuasa <yuasa@hh.iij4u.or.jp> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| * | | | | [PATCH] move some COMPATIBLE_IOCTL entries from x86_64 to common codeChristoph Hellwig2005-11-091-6/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Signed-off-by: Christoph Hellwig <hch@lst.de> Cc: Andi Kleen <ak@muc.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| * | | | | [PATCH] remove ioctl32_handler_tChristoph Hellwig2005-11-093-9/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Some architectures define and use this type in their compat_ioctl code, but all of them can easily use the identical ioctl_trans_handler_t type that is defined in common code. Signed-off-by: Christoph Hellwig <hch@lst.de> Cc: Andi Kleen <ak@muc.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
generated by cgit v1.1 at 2024-12-27 11:10:27 +0000