08 Feb, 2006
6 commits
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If the namespace structure is being shared, allocate a new one and copy
information from the current, shared, structure.Signed-off-by: Janak Desai
Cc: Al Viro
Cc: Christoph Hellwig
Cc: Michael Kerrisk
Cc: Andi Kleen
Cc: Paul Mackerras
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
If filesystem structure is being shared, allocate a new one and copy
information from the current, shared, structure.Signed-off-by: Janak Desai
Cc: Al Viro
Cc: Christoph Hellwig
Cc: Michael Kerrisk
Cc: Andi Kleen
Cc: Paul Mackerras
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
sys_unshare system call handler function accepts the same flags as clone
system call, checks constraints on each of the flags and invokes corresponding
unshare functions to disassociate respective process context if it was being
shared with another task.Here is the link to a program for testing unshare system call.
http://prdownloads.sourceforge.net/audit/unshare_test.c?download
Please note that because of a problem in rmdir associated with bind mounts and
clone with CLONE_NEWNS, the test fails while trying to remove temporary test
directory. You can remove that temporary directory by doing rmdir, twice,
from the command line. The first will fail with EBUSY, but the second will
succeed. I have reported the problem to Ram Pai and Al Viro with a small
program which reproduces the problem. Al told us yesterday that he will be
looking at the problem soon. I have tried multiple rmdirs from the
unshare_test program itself, but for some reason that is not working. Doing
two rmdirs from command line does seem to remove the directory.Signed-off-by: Janak Desai
Cc: Al Viro
Cc: Christoph Hellwig
Cc: Michael Kerrisk
Cc: Andi Kleen
Cc: Paul Mackerras
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Fix compilation problem in PM headers.
Signed-off-by: Rafael J. Wysocki
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
- Remove unneeded bio_get() which would cause a bio leak
- Writing doesn't dirty pages. Reading dirties pages.
- We should dirty the pages after the IO completion, not before
(Busy-waiting for disk I/O completion isn't very polite.)
Signed-off-by: Pavel Machek
Cc: "Rafael J. Wysocki"
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
06 Feb, 2006
3 commits
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It may suck something awful, but it shouldn't taint the kernel.
Signed-off-by: Dave Jones
Signed-off-by: Adrian Bunk
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
migration_cost prints after every CPU hotplug event. Make it print only
once at boot.Signed-off-by: Chuck Ebbert
Acked-by: Ingo Molnar
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
percpu_data blindly allocates bootmem memory to store NR_CPUS instances of
cpudata, instead of allocating memory only for possible cpus.As a preparation for changing that, we need to convert various 0 -> NR_CPUS
loops to use for_each_cpu().(The above only applies to users of asm-generic/percpu.h. powerpc has gone it
alone and is presently only allocating memory for present CPUs, so it's
currently corrupting memory).Signed-off-by: Eric Dumazet
Cc: "David S. Miller"
Cc: James Bottomley
Acked-by: Ingo Molnar
Cc: Jens Axboe
Cc: Anton Blanchard
Acked-by: William Irwin
Cc: Andi Kleen
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
04 Feb, 2006
6 commits
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Five callsites. I dunno how all this crap got back in there :(
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
kernel/cpuset.c:644:38: warning: non-ANSI function declaration of function 'cpuset_update_task_memory_state'
Signed-off-by: Randy Dunlap
Acked-by: Paul Jackson
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
- In case of a negative nsec value the result of the division must be
normalized.- Remove inline from an exported function.
Signed-off-by: George Anzinger
Signed-off-by: Thomas Gleixner
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
When one module exports a function symbol and another module uses that
symbol then kallsyms shows the symbol twice. Once from the consumer with a
type of 'U' and once from the provider with a type of 't' or 'T'. On most
architectures, both entries have the same address so it does not matter
which one is returned by kallsyms_lookup_name(). But on architectures with
function descriptors, the 'U' entry points to the descriptor, not to the
code body, which is not what we want.IA64 # grep -w qla2x00_remove_one /proc/kallsyms
a000000208c25ef8 U qla2x00_remove_one [qla2300]
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
When two function-return probes are inserted on kfree()[1] and the second
on say, sys_link()[2], and later [2] is unregistered, we have a deadlock as
kfree is called with the kretprobe_lock held and the function-return probe
on kfree will also try to grab the same lock.However, we can move the kfree() during unregistration to outside the
spinlock as we are sure that no instances from the free list will be used
after synchronized_sched() returns during the unregistration process.
Thanks to Masami Hiramatsu for spotting this.Signed-off-by: Ananth N Mavinakayanahalli
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
kernel/kprobes.c:353: warning: 'pre_handler_kretprobe' defined but not used
Signed-off-by: Adrian Bunk
Acked-by: Ananth N Mavinakayanahalli
Acked-by: "Keshavamurthy, Anil S"
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
02 Feb, 2006
14 commits
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Currently the zone_reclaim code has a fixed window of 30 seconds of off node
allocations should a local zone have no unused pagecache pages left. Reclaim
will be attempted again after this timeout period to avoid repeated useless
scans for memory. This is also useful to established sufficiently large off
node allocation chunks to relieve the local node.It may be beneficial to adjust that time period for some special situations.
For example if memory use was exceeding node capacity one may want to give up
for longer periods of time. If memory spikes intermittendly then one may want
to shorten the time period to reduce the number of off node allocations.This patch allows just that....
Signed-off-by: Christoph Lameter
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
- If we only reclaim nr_pages then its okay to stay on node.
Switch from > to >= for the comparison.- vm_table[] entry for zone_reclaim_mode is a bit screwed up.
- Add empty lines around shrink_zone to show that this is the
central function to be called.Signed-off-by: Christoph Lameter
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Prevent the kernel from setting the log level to 10 unconditionally during
suspend/resume which was needed in the past for debugging, but generally is
undesirable.Signed-off-by: Rafael J. Wysocki
Acked-by: Pavel Machek
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Change sched_getaffinity() so that it returns a bitmap that indicates the
legally schedulable cpus that a task is allowed to run on.Without this patch, if CONFIG_HOTPLUG_CPU is enabled, sched_getaffinity()
unconditionally returns (at least on IA64) a mask with NR_CPUS bits set.
This conveys no useful infornmation except for a kernel compile option.This fixes a breakage we obseved running recent kernels. We have MPI jobs
that use sched_getaffinity() to determine where to place their threads.
Placing them on non-existant cpus is problematic :-)Signed-off-by: Jack Steiner
Acked-by: Ingo Molnar
Cc: Nathan Lynch
Cc: Paul Jackson
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This function is neither used nor has any real contents.
Signed-off-by: Adrian Bunk
Acked-by: Thomas Gleixner
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The expiry time for relative timers with SIGEV_NONE set was never
updated to the correct value.Pointed out by George Anzinger.
Signed-off-by: Thomas Gleixner
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
At some point we added credits to people who actively helped to bring
k/hr-timers along. This was lost in the big code revamp. Add it back.Signed-off-by: Thomas Gleixner
Signed-off-by: Ingo Molnar
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Clean up the interface to hrtimers by changing the init code to pass the mode
as well as the clock. This allow the init code to select the correct base and
eliminates extra timer re-init code in posix-timers. We also simplify the
restart interface nanosleep use.Signed-off-by: George Anzinger
Signed-off-by: Thomas Gleixner
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
From: Steven Rostedtrostedt@goodmis.org
CPU0 expires a posix-timer and runs the callback function. The signal is
queued.After releasing the posix-timer lock and before returning to hrtimer_run_queue
CPU0 gets interrupted. CPU1 delivers the queued signal and rearms the timer.
CPU0 comes back to hrtimer_run_queue and sets the timer state to expired.The next modification of the timer can result in an oops, because the state
information is wrong.Keep track of state = RUNNING and check if the state has been in the return
path of hrtimer_run_queue. In case the state has been changed, ignore a
restart request and do not touch the state variable.Signed-off-by: Steven Rostedt
Signed-off-by: Thomas Gleixner
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This resolves bugzilla bug#5617. The oldvalue of the timer was read after the
timer was cancelled, so the remaining time was always zero.Signed-off-by: Thomas Gleixner
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Fixup the conversion of posix-timers to hrtimers.
Signed-off-by: Thomas Gleixner
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The itimer conversion removed the locking which protects the timer and
variables in the shared signal structure. Steven Rostedt found the problem in
the latest -rt patches.Signed-off-by: Thomas Gleixner
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Make swsusp use bytes as the image size units, which is needed for future
compatibility.Signed-off-by: Rafael J. Wysocki
Acked-by: Pavel Machek
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
01 Feb, 2006
5 commits
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I get storms of warnings from local_bh_enable(). Better-tested patches,
please.Cc: Ingo Molnar
Cc: "Paul E. McKenney"
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
rcu_torture_lock is used in a softirq-unsafe manner, but it is also
taken by rcu_torture_cb(), which may execute in softirq-context,
resulting in potential deadlocks.The fix is to acquire rcu_torture_lock in a softirq-safe manner. With
this fix applied, the rcu-torture code passes validation.Signed-off-by: Ingo Molnar
Acked-by: Paul E. McKenney
Signed-off-by: Linus Torvalds -
RCU task-struct freeing can call free_uid(), which is taking
uidhash_lock - while other users of uidhash_lock are softirq-unsafe.The fix is to always take the uidhash_spinlock in a softirq-safe manner.
Signed-off-by: Ingo Molnar
Acked-by: Paul E. McKenney
Signed-off-by: Linus Torvalds -
This reduces the amount of time the migration cost calculations cost
during bootup. Based on numbers by Tony Luck .Signed-off-by: Ingo Molnar
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settime() with a NULL timeval is silly but legal.
Noticed by Dave Jones
Signed-off-by: Linus Torvalds
25 Jan, 2006
1 commit
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Signed-off-by: Len Brown
19 Jan, 2006
4 commits
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EDAC requires a way to scrub memory if an ECC error is found and the chipset
does not do the work automatically. That means rewriting memory locations
atomically with respect to all CPUs _and_ bus masters. That means we can't
use atomic_add(foo, 0) as it gets optimised for non-SMPThis adds a function to include/asm-foo/atomic.h for the platforms currently
supported which implements a scrub of a mapped block.It also adjusts a few other files include order where atomic.h is included
before types.h as this now causes an error as atomic_scrub uses u32.Signed-off-by: Alan Cox
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The TIF_RESTORE_SIGMASK flag allows us to have a generic implementation of
sys_rt_sigsuspend() instead of duplicating it for each architecture. This
provides such an implementation and makes arch/powerpc use it.It also tidies up the ppc32 sys_sigsuspend() to use TIF_RESTORE_SIGMASK.
Signed-off-by: David Woodhouse
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Currently, a negative policy argument passed into the
'sys_sched_setscheduler()' system call, will return with success. However,
the manpage for 'sys_sched_setscheduler' says:EINVAL The scheduling policy is not one of the recognized policies, or the
parameter p does not make sense for the policy.Signed-off-by: Jason Baron
Acked-by: Ingo Molnar
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
proc support for zone reclaim
This patch creates a proc entry /proc/sys/vm/zone_reclaim_mode that may be
used to override the automatic determination of the zone reclaim made on
bootup.Signed-off-by: Christoph Lameter
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
17 Jan, 2006
1 commit
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fix the following sparse warning:
kernel/hrtimer.c:665:34: warning: incorrect type in argument 2 (different address spaces)
kernel/hrtimer.c:665:34: expected void const *from
kernel/hrtimer.c:665:34: got struct timespec [noderef] *
kernel/hrtimer.c:664:2: warning: dereference of noderef expressionSigned-off-by: Ingo Molnar
Signed-off-by: Linus Torvalds