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net/sunrpc/rpc_pipe.c
This patch is against 2.6.10, but still applies cleanly. It's just
s/driverfs/sysfs/ in these two files.
Signed-off-by: Rolf Eike Beer <eike-kernel@sf-tec.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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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: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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Extend support for dynamic registration and unregistration of the cpu,
by implementing and exporting arch_register_cpu()/arch_unregister_cpu().
Also combine multiple implementation of topology_init() functions to
single topology_init() in case of ia64 architecture.
Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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This means we won't get any warnings about unused
variables - they _are_ used in some configurations.
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This file provides ability for caller of register_cpu() to either create a
control file, or not. This can be handy if a particular platform decides
that certain CPU's are not removable. Hence would like to not create a
control file.
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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From: Nathan Lynch <nathanl@austin.ibm.com>
The hotcpu_notifier macro does not properly record the given priority in
the notifier block. This causes trouble only for callers which specify a
non-zero priority, of which there are none (yet).
Signed-off-by: Nathan Lynch <nathanl@austin.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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Implement cpu_down(): uses stop_machine to freeze the machine, then
uses (arch-specific) __cpu_disable() and migrate_all_tasks().
Whole thing under CONFIG_HOTPLUG_CPU, so doesn't break archs which
don't define that.
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Note that without CONFIG_HOTPLUG_CPU, online cpus == possible cpus, so
substitutions are a noop.
- Changes show_stat to print out stats for every possible cpu, not
just online CPUs.
- Allocate mem in stat_open on possible, not online_cpus.
- Add conventient macros to cpu.h: especially cpu_is_offline() for
testing if a cpu is still online.
- Add a num_possible_cpus() similar to num_online_cpus(), and define
cpu_possible_mask for UP.
- Allow printk on down cpus once system is running.
- Mask cpumask with possible, not online cpus, for sys_getaffinity().
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From: Rusty Russell <rusty@rustcorp.com.au>
The cpucontrol mutex is not required when no cpus can go up and down.
Andrew wrote a wrapper for it to avoid #ifdefs, this expands that to only
be defined for CONFIG_HOTPLUG_CPU, and uses it everywhere.
The only downside is that the cpucontrol lock was overloaded by my recent
patch to net/core/flow.c to protect it from reentrance, so this
reintroduces the local flow_flush_sem. This code isn't speed critical, so
taking two locks when CONFIG_HOTPLUG_CPU=y is not really an issue.
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The code directly accessed the "cpucontrol" semaphore used
for CPU hotplug. That doesn't work all that well, since the
semaphore doesn't even exist on UP.
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Trivial patch: when these were introduced cpu.h didn't exist.
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This is an implementation of the in-kernel module loader extending
the try_inc_mod_count() primitive and making its use compulsory.
This has the benifit of simplicity, and similarity to the existing
scheme. To reduce the cost of the constant increments and
decrements, reference counters are lockless and per-cpu.
Eliminated (coming in following patches):
o Modversions
o Module parameters
o kallsyms
o EXPORT_SYMBOL_GPL and MODULE_LICENCE checks
o DEVICE_TABLE support.
New features:
o Typesafe symbol_get/symbol_put
o Single "insert this module" syscall interface allows trivial userspace.
o Raceless loading and unloading
You will need the trivial replacement module utilities from:
http://ozlabs.org/~rusty/module-init-tools-0.6.tar.gz
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From Matthew Dobson.
This final patch from Matthew cleans up a few leftovers which were noted
after the code had been reviewed and tested a bit in the -mm patchsets.
1) Update register_XXX and arch_register_XXX functions to return int
instead of void. Functions calling these functions should know if
they completed successfully to take appropriate further registration
action, or not bother.
2) Drop some pointless error checking in the arch_register_XXX
functions.
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From Matthew Dobson.
Update/Create core files for DriverFS Topology.
This patch creates the generic structures that are (will be) embedded in
the per-arch structures. Also creates calls to register these generic
structures (CPUs, MemBlks, & Nodes).
Note that without arch-specific structures in which to embed these
structures, and an arch-specific initialization routine, these
functions/structures remain unused.
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- Create struct cpu to generically describe cpus (it simply contains
a struct sys_device in it).
- Define an array of size NR_CPUS in arch/i386/kernel/cpu/common.c
and register each on bootup. This gives us something like:
# tree -d /sys/root/sys/
/sys/root/sys/
|-- cpu0
|-- pic0
`-- rtc0
and:
# tree -d /sys/bus/system/devices/
/sys/bus/system/devices/
|-- cpu0 -> ../../../root/sys/cpu0
- Define arch-specific CPU driver that's also registered on boot.
That gives us:
# tree -d /sys/bus/system/drivers/
/sys/bus/system/drivers/
|-- cpu
- Create a CPU device class that's registered very early. That
gives us all the CPUs in the system in one place:
# tree -d /sys/class/cpu/
/sys/class/cpu/
|-- devices
| `-- 0 -> ../../../root/sys/cpu0
`-- drivers
Other archs are encouraged to do the same.
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