- 25 Jun, 2005 40 commits
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Ashok Raj authored
This patch provides an option to switch broadcast or use mask version for sending IPI's. If CONFIG_HOTPLUG_CPU is defined, we choose not to use broadcast shortcuts by default, otherwise we choose broadcast mode as default. both cases, one can change this via startup cmd line option, to choose no-broadcast mode. no_ipi_broadcast=1 This is provided on request from Andi Kleen, since he doesnt agree with replacing IPI shortcuts as a solution for CPU hotplug. Without removing broadcast IPI's, it would mean lots of new code for __cpu_up() path, which would acheive the same results. Signed-off-by:
Ashok Raj <ashok.raj@intel.com> Acked-by:
Andi Kleen <ak@muc.de> Acked-by:
Zwane Mwaikambo <zwane@arm.linux.org.uk> Signed-off-by:
Andrew Morton <akpm@osdl.org> Signed-off-by:
Linus Torvalds <torvalds@osdl.org>
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Ashok Raj authored
Broadcast IPI's provide un-expected behaviour for cpu hotplug. CPU's in offline state also end up receiving the IPI. Once the cpus become online they receive these stale IPI's which are bad and introduce unexpected behaviour. This is easily avoided by not sending a broadcast and addressing just the CPU's in online map. Doing prelim cycle counts it appears there is no big overhead and numbers seem around 0x3000-0x3900 on an average on x86 and x86_64 systems with CPUS running 3G, both for broadcast and mask version of the API's. The shortcuts are useful only for flat mode (where the perf shows no degradation), and in cluster mode, its unicast anyway. Its simpler to just not use broadcast anymore. Signed-off-by:
Shaohua Li <shaohua.li@intel.com> Signed-off-by:
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Ashok Raj authored
This patch is a minor cleanup to the cpu sibling/core map. It is required that this setup happens on a per-cpu bringup time. Signed-off-by:
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Ashok Raj authored
Experimental CPU hotplug patch for x86_64 ----------------------------------------- This supports logical CPU online and offline. - Test with maxcpus=1, and then kick other cpu's off to test if init code is all cleaned up. CONFIG_SCHED_SMT works as well. - idle threads are forked on demand from keventd threads for clean startup TBD: 1. Not tested on a real NUMA machine (tested with numa=fake=2) 2. Handle ACPI pieces for physical hotplug support. Signed-off-by:
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Ashok Raj authored
This patch adds __cpuinit and __cpuinitdata sections that need to exist past boot to support cpu hotplug. Caveat: This is done *only* for EM64T CPU Hotplug support, on request from Andi Kleen. Much of the generic hotplug code in kernel, and none of the other archs that support CPU hotplug today, i386, ia64, ppc64, s390 and parisc dont mark sections with __cpuinit, but only mark them as __devinit, and __devinitdata. If someone is motivated to change generic code, we need to make sure all existing hotplug code does not break, on other arch's that dont use __cpuinit, and __cpudevinit. Signed-off-by:
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Ashok Raj authored
I really wish smp_prepare_cpu() would disappear eventually. In the interim this is ideally a weak function, so we dont end up changing several places to define this dummy in headers. Today since the dummy declaration is done only in drivers/base/cpu.c but the function is called in kernel/power/smp.c i get undefined reference in my cpu hotplug code for x86_64 under development. Signed-off-by:
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Li Shaohua authored
Clean CPU states in order to reuse smp boot code for CPU hotplug. Signed-off-by: Li Shaohua<shaohua.li@intel.com> Signed-off-by:
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Li Shaohua authored
Trival patch for CPU hotplug. In CPU identify part, only did cleaup for intel CPUs. Need do for other CPUs if they support S3 SMP. Signed-off-by: Li Shaohua<shaohua.li@intel.com> Signed-off-by:
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Li Shaohua authored
Make sibling map init per-cpu. Hotplug CPU may change the map at runtime. Signed-off-by: Li Shaohua<shaohua.li@intel.com> Signed-off-by:
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Li Shaohua authored
Make SEP init per-cpu, so it is hotplug safe. Signed-off-by: Li Shaohua<shaohua.li@intel.com> Signed-off-by:
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Ashok Raj authored
This patch introduces a startup parameter no_broadcast. When we enable CONFIG_HOTPLUG_CPU, we dont want to use broadcast shortcut as it has ill effects on a offline cpu. If we issue broadcast, the IPI is also delivered to offline cpus, or partially up cpu causing stale IPI's to be handled, which is a problem and can cause undesirable effects. Introduces a new startup cmdline option no_ipi_broadcast, that can be switched at cmdline if necessary. Signed-off-by:
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Zwane Mwaikambo authored
(The i386 CPU hotplug patch provides infrastructure for some work which Pavel is doing as well as for ACPI S3 (suspend-to-RAM) work which Li Shaohua <shaohua.li@intel.com> is doing) The following provides i386 architecture support for safely unregistering and registering processors during runtime, updated for the current -mm tree. In order to avoid dumping cpu hotplug code into kernel/irq/* i dropped the cpu_online check in do_IRQ() by modifying fixup_irqs(). The difference being that on cpu offline, fixup_irqs() is called before we clear the cpu from cpu_online_map and a long delay in order to ensure that we never have any queued external interrupts on the APICs. There are additional changes to s390 and ppc64 to account for this change. 1) Add CONFIG_HOTPLUG_CPU 2) disable local APIC timer on dead cpus. 3) Disable preempt around irq balancing to prevent CPUs going down. 4) Print irq stats for all possible cpus. 5) Debugging check for interrupts on offline cpus. 6) Hacky fixup_irqs() to redirect irqs when cpus go off/online. 7) play_dead() for offline cpus to spin inside. 8) Handle offline cpus set in flush_tlb_others(). 9) Grab lock earlier in smp_call_function() to prevent CPUs going down. 10) Implement __cpu_disable() and __cpu_die(). 11) Enable local interrupts in cpu_enable() after fixup_irqs() 12) Don't fiddle with NMI on dead cpu, but leave intact on other cpus. 13) Program IRQ affinity whilst cpu is still in cpu_online_map on offline. Signed-off-by:
Zwane Mwaikambo <zwane@linuxpower.ca> Signed-off-by:
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Shaohua Li authored
I'm doing the cpu hotplug stress test and found a variable ('ready') is overflow after several hundreds rounds of cpu hotplug. Here is a fix. Signed-off-by: Shaohua Li<shaohua.li@intel.com> Signed-off-by: -
Shaohua Li authored
With hpet enabled, cpu hotplug uses some routines marked with __init. Signed-off-by: Shaohua Li<shaohua.li@intel.com> Signed-off-by:
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Andrey Panin authored
Whitespace and CodingStyle cleanup. No functionality changes. Signed-off-by:
Andrey Panin <pazke@donpac.ru> Signed-off-by:
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Andrey Panin authored
Since last dmi quirk looks useless (it just prints 404 compliant url) we can finally remove central dmi blacklist. Signed-off-by:
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Andrey Panin authored
This patch moves ACPI sleep quirk out of dmi_scan.c Signed-off-by:
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Andrey Panin authored
This patch moves ACPI boot quirks out of dmi_scan.c Signed-off-by:
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Michael Ellerman authored
Stephen's patch to remove LparData.h missed an include in lparcfg.c This fixes a few compile warnings. Signed-off-by:
Michael Ellerman <michael@ellerman.id.au> Signed-off-by:
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Kumar Gala authored
Continue the Good Fight: Limit bootmem.h include creep. Signed-off-by:
Jon Loeliger <jdl@freescale.com> Signed-off-by:
Kumar Gala <kumar.gala@freescale.com> Signed-off-by:
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Kumar Gala authored
All consumers of the driver MPC10x, MPC52xx, MPC824x, MPC83xx, and MPC85xx are all using platform devices. We can get ride of the dead code to support using this driver with the old OCP based model Signed-off-by:
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Kumar Gala authored
Support for the OCP device model on Freescale (FSL) PPC's is no longer used. All FSL PPC's that were using OCP have be converted to using the platform device model. Signed-off-by:
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Kumar Gala authored
The e200 core is a Book-E core (similar to e500) that has a unified L1 cache and is not cache coherent on the bus. The e200 core also adds a separate exception level for debug exceptions. Part of this patch helps to cleanup a few cases that are true for all Freescale Book-E parts, not just e500. Signed-off-by:
Kim Phillips <kim.phillips@freescale.com> Signed-off-by:
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Kumar Gala authored
Ensure that the returned pointer from ppc_sys_get_pdata is not NULL before we start using it. This handles any cases where we have variants of processors on the same board with different functionality. Signed-off-by:
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Lorenzo Hernndez Garca-Hierro authored
This patch,based on sample code by Roland McGrath, adds an execheap permission check that controls the ability to make the heap executable so that this can be prevented in almost all cases (the X server is presently an exception, but this will hopefully be resolved in the future) so that even programs with execmem permission will need to have the anonymous memory mapped in order to make it executable. The only reason that we use a permission check for such restriction (vs. making it unconditional) is that the X module loader presently needs it; it could possibly be made unconditional in the future when X is changed. The policy patch for the execheap permission is available at: http://pearls.tuxedo-es.org/patches/selinux/policy-execheap.patchSigned-off-by:
Lorenzo Hernandez Garcia-Hierro <lorenzo@gnu.org> Acked-by:
James Morris <jmorris@redhat.com> Acked-by:
Stephen Smalley <sds@tycho.nsa.gov> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by:
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Lorenzo Hernandez Garca-Hierro authored
This patch adds an execstack permission check that controls the ability to make the main process stack executable so that attempts to make the stack executable can still be prevented even if the process is allowed the existing execmem permission in order to e.g. perform runtime code generation. Note that this does not yet address thread stacks. Note also that unlike the execmem check, the execstack check is only applied on mprotect calls, not mmap calls, as the current security_file_mmap hook is not passed the necessary information presently. The original author of the code that makes the distinction of the stack region, is Ingo Molnar, who wrote it within his patch for /proc/<pid>/maps markers. (http://marc.theaimsgroup.com/?l=linux-kernel&m=110719881508591&w=2) The patches also can be found at: http://pearls.tuxedo-es.org/patches/selinux/policy-execstack.patch http://pearls.tuxedo-es.org/patches/selinux/kernel-execstack.patch policy-execstack.patch is the patch that needs to be applied to the policy in order to support the execstack permission and exclude it from general_domain_access within macros/core_macros.te. kernel-execstack.patch adds such permission to the SELinux code within the kernel and adds the proper permission check to the selinux_file_mprotect() hook. Signed-off-by:
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Hugh Dickins authored
Out-of-tree user of remap_pfn_range hit kernel BUG at mm/memory.c:1112! It passes an unrounded size to remap_pfn_range, which was okay before 2.6.12, but misses remap_pte_range's new end condition. An audit of all the other ptwalks confirms that this is the only one so exposed. Signed-off-by:
Hugh Dickins <hugh@veritas.com> Signed-off-by:
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Hifumi Hisashi authored
Fix a bug on error handling in the direct I/O function. Currently, if a file is opened with the O_DIRECT|O_SYNC flag, the write() syscall cannot receive the EIO error after an I/O error (SCSI cable is disconnected etc.). Return values of other points that call generic_osync_inode() are treated appropriately. Signed-off-by:
Hisashi Hifumi <hifumi.hisashi@lab.ntt.co.jp> Signed-off-by:
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Yoichi Yuasa authored
2.6.12-git6 doesn't boot on some MIPS machines. They need the support of flat memory and discontig memory. Signed-off-by:
Yoichi Yuasa <yuasa@hh.iij4u.or.jp> Signed-off-by:
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Russell King authored
A couple of drivers declare register_serial/unregister_serial prototypes but don't use them. FRV contains a commented out call to register_serial. Since these are deprecated, remove these unnecessary references. Signed-off-by:
Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by:
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Dave Jones authored
Gcc4 doesn't like volatile casts as lvalues. Make the structure members volatile instead. Signed-off-by:
Dave Jones <davej@redhat.com> Cc: "Luck, Tony" <tony.luck@intel.com> Signed-off-by:
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Dmitry Torokhov authored
I8K: add BIOS signatures of a newer Dell laptops, also there can be more than one temperature sensor reported by BIOS. Lifted from driver 1.25 on Massimo Dal Zotto's site. Signed-off-by:Dmitry Torokhov <dtor@mail.ru> Signed-off-by:
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Dmitry Torokhov authored
I8K: use module_{init|exit} instead of old style #ifdef MODULE code, some formatting changes. Signed-off-by: -
Dmitry Torokhov authored
I8K: Change proc code to use seq_file. Signed-off-by:
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Dmitry Torokhov authored
I8K: Change to use stock dmi infrastructure instead of homegrown parsing code. The driver now requires box's DMI data to match list of supported models so driver can be safely compiled-in by default without fear of it poking into random SMM BIOS code. DMI checks can be ignored with i8k.ignore_dmi option. Signed-off-by: -
Dmitry Torokhov authored
I8K: pass through Lindent to change 4 spaces identation to TABs Signed-off-by:
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Dmitry Torokhov authored
Toshiba legacy driver cleanup: - use module_init/module_exit for initialization instead of using #ifdef MODULE and calling tosh_init manually from drivers/char/misc.c - do not explicitly initialize static variables - some whitespace and formatting cleanups Signed-off-by:
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Mauro Carvalho Chehab authored
static declaration of cx88_pci_irqs follows non-static. Signed-off-by:
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Uwe Bugla authored
Signed-off-by:
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Linus Torvalds authored
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