29 Dec, 2005
1 commit
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Signed-off-by: David S. Miller
23 Dec, 2005
2 commits
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It's definition is wrong (-1 means "no limit" not 999),
only the Sparc SunOS/Solaris compat code uses it, so
let's just kill it off completely from limits.h and
all referencing code.Noticed by Ulrich Drepper.
Signed-off-by: David S. Miller
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Introduce a Kconfig symbol SPARC that is defined on both the sparc and
sparc64 architectures.This symbol makes some dependencies more readable.
Signed-off-by: Adrian Bunk
Signed-off-by: David S. Miller
21 Dec, 2005
1 commit
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It was a stupid workaround for the "static inline" vs.
"extern inline" issues of long ago, and it is what causes
schedule() to be inlined like crazy into kernel/sched.c
when -Os is specified.MIPS and S390 should probably do the same.
Now CC_OPTIMIZE_FOR_SIZE can be safely used on sparc64
once more.Signed-off-by: David S. Miller
13 Dec, 2005
1 commit
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When multiple probes are registered at the same address and if due to some
recursion (probe getting triggered within a probe handler), we skip calling
pre_handlers and just increment nmissed field.The below patch make sure it walks the list for multiple probes case.
Without the below patch we get incorrect results of nmissed count for
multiple probe case.Signed-off-by: Anil S Keshavamurthy
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
30 Nov, 2005
1 commit
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Increment the PFN field of the PTE so that the tests
on vm_pfn in mm/memory.c match up. The TLB ignores these
lower bits for larger page sizes, so it's OK to set things
like this.Signed-off-by: David S. Miller
29 Nov, 2005
1 commit
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Here are the Sparc bits.
Signed-off-by: Linus Torvalds
23 Nov, 2005
2 commits
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Earlier I unifdefed PageCompound, so that snd_pcm_mmap_control_nopage and
others can give out a 0-order component of a higher-order page, which won't
be mistakenly freed when zap_pte_range unmaps it. But many Bad page states
reported a PG_reserved was freed after all: I had missed that we need to
say __GFP_COMP to get compound page behaviour.Some of these higher-order pages are allocated by snd_malloc_pages, some by
snd_malloc_dev_pages; or if SBUS, by sbus_alloc_consistent - but that has
no gfp arg, so add __GFP_COMP into its sparc32/64 implementations.I'm still rather puzzled that DRM seems not to need a similar change.
Signed-off-by: Hugh Dickins
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Although we tend to associate VM_RESERVED with remap_pfn_range, quite a few
drivers set VM_RESERVED on areas which are then populated by nopage. The
PageReserved removal in 2.6.15-rc1 changed VM_RESERVED not to free pages in
zap_pte_range, without changing those drivers not to set it: so their pages
just leak away.Let's not change miscellaneous drivers now: introduce VM_UNPAGED at the core,
to flag the special areas where the ptes may have no struct page, or if they
have then it's not to be touched. Replace most instances of VM_RESERVED in
core mm by VM_UNPAGED. Force it on in remap_pfn_range, and the sparc and
sparc64 io_remap_pfn_range.Revert addition of VM_RESERVED to powerpc vdso, it's not needed there. Is it
needed anywhere? It still governs the mm->reserved_vm statistic, and special
vmas not to be merged, and areas not to be core dumped; but could probably be
eliminated later (the drivers are probably specifying it because in 2.4 it
kept swapout off the vma, but in 2.6 we work from the LRU, which these pages
don't get on).Use the VM_SHM slot for VM_UNPAGED, and define VM_SHM to 0: it serves no
purpose whatsoever, and should be removed from drivers when we clean up.Signed-off-by: Hugh Dickins
Acked-by: William Irwin
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
13 Nov, 2005
1 commit
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This patch adds a new function, sbusfb_compat_ioctl() to
drivers/video/sbuslib.c and uses it as compat_ioctl in all sbus fb
driversThis remove the last per-arch compat ioctl bits in
arch/sparc64/kernel/ioctl32.c so it would be nice if people could test
if this actually copiles and works and if yes apply it :)Signed-off-by: Christoph Hellwig
Signed-off-by: David S. Miller
12 Nov, 2005
1 commit
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Noticed by Tom 'spot' Callaway.
Even on uniprocessor we always reported the number of physical
cpus in the system via /proc/cpuinfo. But when this got changed
to use num_possible_cpus() it always reads as "1" on uniprocessor.
This change was unintentional.So scan the firmware device tree and count the number of cpu
nodes, and report that, as we always did.Signed-off-by: David S. Miller
10 Nov, 2005
2 commits
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Signed-off-by: Christoph Hellwig
Signed-off-by: David S. Miller -
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
Signed-off-by: David S. Miller
09 Nov, 2005
4 commits
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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
Cc: Ingo Molnar
Cc: Con Kolivas
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
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
PPC build fix
From: Yoichi Yuasa
MIPS build fix
Signed-off-by: Nick Piggin
Signed-off-by: Yoichi Yuasa
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
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
Cc: Andi Kleen
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Update comment on get_user_insn to the more general "pte lock", which may
or may not be the page_table_lock. Note vmtruncate handled like kswapd.Signed-off-by: Hugh Dickins
Signed-off-by: David S. Miller
08 Nov, 2005
16 commits
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Signed-off-by: David S. Miller
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drivers/drm/ now implements proper ->compat_ioctl methods, so this isn't
needed anymore.Signed-off-by: Christoph Hellwig
Signed-off-by: David S. Miller -
Signed-off-by: Christoph Hellwig
Signed-off-by: David S. Miller -
all ioctls are 32bit compat clean, so the driver can use ->compat_ioctl
and ->unlocked_ioctl easily.Signed-off-by: Christoph Hellwig
Signed-off-by: David S. Miller -
implement a compat_ioctl handle in the driver instead of having table
entries in sparc64 ioctl32.c (I plan to get rid of the arch ioctl32.c
file eventually)Signed-off-by: Christoph Hellwig
Signed-off-by: David S. Miller -
all the ioctls in the driver are 32bit compat clean and don't need BKL,
so we can switch it to ->unlocked_ioctl and ->compat_ioctl trivially.Signed-off-by: Christoph Hellwig
Signed-off-by: David S. Miller -
Would you mind applying the following patch that kills those two + the
m68k and Documentation/ references?Signed-off-by: Christoph Hellwig
Signed-off-by: David S. Miller -
all these are handled by fs/compat_ioctls.c already.
Signed-off-by: Christoph Hellwig
Signed-off-by: David S. Miller -
I don't know if we ever implemented this, but the only user in any 2.6
tree are the compat ioctls.Signed-off-by: Christoph Hellwig
Signed-off-by: David S. Miller -
The old keyboard driver is gone in 2.6, so the only user left are the
compat ioctls.Signed-off-by: Christoph Hellwig
Signed-off-by: David S. Miller -
The old sound drivers are gone in 2.6, so the only user left are the
compat ioctls.Signed-off-by: Christoph Hellwig
Signed-off-by: David S. Miller -
this inline routine in arch/sparc64/kernel/ioctl32.c is completely
unused and superceeded by compat_alloc_user_space()Signed-off-by: Christoph Hellwig
Signed-off-by: David S. Miller -
It only serves to generate false-positive buildcheck warnings.
Just set it initially to tick_operations which uses the v9
%tick register which every sparc64 processor has.Signed-off-by: David S. Miller
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It isn't needed any longer, as noted by Hugh Dickins.
We still need the flush routines, due to the one remaining
call site in hugetlb_prefault_arch_hook(). That can be
eliminated at some later point, however.Signed-off-by: David S. Miller
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sparc64 is unique among architectures in taking the page_table_lock in
its context switch (well, cris does too, but erroneously, and it's not
yet SMP anyway).This seems to be a private affair between switch_mm and activate_mm,
using page_table_lock as a per-mm lock, without any relation to its uses
elsewhere. That's fine, but comment it as such; and unlock sooner in
switch_mm, more like in activate_mm (preemption is disabled here).There is a block of "if (0)"ed code in smp_flush_tlb_pending which would
have liked to rely on the page_table_lock, in switch_mm and elsewhere;
but its comment explains how dup_mmap's flush_tlb_mm defeated it. And
though that could have been changed at any time over the past few years,
now the chance vanishes as we push the page_table_lock downwards, and
perhaps split it per page table page. Just delete that block of code.Which leaves the mysterious spin_unlock_wait(&oldmm->page_table_lock)
in kernel/fork.c copy_mm. Textual analysis (supported by Nick Piggin)
suggests that the comment was written by DaveM, and that it relates to
the defeated approach in the sparc64 smp_flush_tlb_pending. Just delete
this block too.Signed-off-by: Hugh Dickins
Signed-off-by: David S. Miller -
sparc64 prom_callback and new_setup_frame32 each operates on a user page
table without holding lock, and no doubt they've good reason. But I'd
feel more confident if they were to do a "pte = *ptep" and then operate
on pte, rather than re-evaluating *ptep.Signed-off-by: Hugh Dickins
Signed-off-by: David S. Miller
07 Nov, 2005
6 commits
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This is the arch/ part of the big kfree cleanup patch.
Remove pointless checks for NULL prior to calling kfree() in arch/.
Signed-off-by: Jesper Juhl
Acked-by: Grant Grundler
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Reorganize the preempt_disable/enable calls to eliminate the extra preempt
depth. Changes based on Paul McKenney's review suggestions for the kprobes
RCU changeset.Signed-off-by: Ananth N Mavinakayanahalli
Signed-off-by: Anil S Keshavamurthy
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Changes to the arch kprobes infrastructure to take advantage of the locking
changes introduced by usage of RCU for synchronization. All handlers are now
run without any locks held, so they have to be re-entrant or provide their own
synchronization.Signed-off-by: Ananth N Mavinakayanahalli
Signed-off-by: Anil S Keshavamurthy
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Sparc64 changes to track kprobe execution on a per-cpu basis. We now track
the kprobe state machine independently on each cpu using an arch specific
kprobe control block.Signed-off-by: Ananth N Mavinakayanahalli
Signed-off-by: Anil S Keshavamurthy
Cc: "David S. Miller"
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The following set of patches are aimed at improving kprobes scalability. We
currently serialize kprobe registration, unregistration and handler execution
using a single spinlock - kprobe_lock.With these changes, kprobe handlers can run without any locks held. It also
allows for simultaneous kprobe handler executions on different processors as
we now track kprobe execution on a per processor basis. It is now necessary
that the handlers be re-entrant since handlers can run concurrently on
multiple processors.All changes have been tested on i386, ia64, ppc64 and x86_64, while sparc64
has been compile tested only.The patches can be viewed as 3 logical chunks:
patch 1: Reorder preempt_(dis/en)able calls
patches 2-7: Introduce per_cpu data areas to track kprobe execution
patches 8-9: Use RCU to synchronize kprobe (un)registration and handler
execution.Thanks to Maneesh Soni, James Keniston and Anil Keshavamurthy for their
review and suggestions. Thanks again to Anil, Hien Nguyen and Kevin Stafford
for testing the patches.This patch:
Reorder preempt_disable/enable() calls in arch kprobes files in preparation to
introduce locking changes. No functional changes introduced by this patch.Signed-off-by: Ananth N Mavinakayahanalli
Signed-off-by: Anil S Keshavamurthy
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Andrew Morton suggested to move kprobes from kernel hacking menu, since
kernel hacking menu is in-appropriate for the Kprobes. This patch moves
Kprobes and Oprofile under instrumentation menu.(akpm: it's not a natural fit, but things like djprobes and the s390 guys'
statistics library need a home)Signed-of-by: Prasanna S Panchamukhi
Cc: Philippe Elie
Cc: John Levon
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
31 Oct, 2005
1 commit
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Define jiffies_64 in kernel/timer.c rather than having 24 duplicated
defines in each architecture.Signed-off-by: Thomas Gleixner
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
