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Resend of earlier patch (no changes) from Catalin used to provide
device feature change notification.
Signed-off-by: Catalin BOIE <catab at umbrella.ro>
Acked-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Introduce CPU_DOWN_FAILED notifier, so we can cope with a failure after a
CPU_DOWN_PREPARE notice.
This fixes 3/8 "add CPU_DOWN_PREPARE notifier" to be useful
Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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Add a CPU_DOWN_PREPARE hotplug CPU notifier. This is needed so we can dettach
all sched-domains before a CPU goes down, thus we can build domains from
online cpumasks, and not have to check for the possibility of a CPU coming up
or going down.
Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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This patch modifies the return value of kprobes exceptions notify handler.
The kprobes exception notifier returns NOTIFY_STOP on handling
notification. This patch helps other debuggers to co-exists with the
Kprobes. Other debuggers registered for exceptions notification must
return NOTIFY_STOP on handling the notification.
Signed-off-by: Prasanna S Panchamukhi <prasanna@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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We no longer have a CPU_OFFLINE notifier: we freeze the machine and
kill the CPU atomically. Remove it.
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Patch from Dipankar Sarma <dipankar@in.ibm.com>
This is Manfred's patch which provides a CPU_UP_PREPARE cpu notifier to
allow initialization of per_cpu data just before the cpu becomes fully
functional.
It also provides a facility for the CPU_UP_PREPARE handler to return
NOTIFY_BAD to signify that the CPU is not permitted to come up. If
that happens, a CPU_UP_CANCELLED message is passed to all the handlers.
The patch also fixes a bogus NOFITY_BAD return from the softirq setup
code.
Patch has been acked by Rusty.
We need this mechanism in slab for starting per-cpu timers and for
allocating the per-cpu slab hgead arrays *before* the CPU has come up
and started using slab.
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This patch alters the boot sequence to "plug in" each CPU, one at a
time. You need the patch for each architecture, as well. The
interface used to be "smp_boot_cpus()", "smp_commence()", and each
arch implemented the "maxcpus" boot arg itself. With this patch,
it is:
smp_prepare_cpus(maxcpus): probe for cpus and set up cpu_possible(cpu).
__cpu_up(cpu): called *after* initcalls, for each cpu where
cpu_possible(cpu) is true.
smp_cpus_done(maxcpus): called after every cpu has been brought up
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