On Mon, Jul 09, 2018 at 05:52:04PM +0200, Daniel Vetter wrote:
> for_each_something(foo)
> if (foo->bla)
> call_bla(foo);
> else
> call_default(foo);
Note that the kernel coding style 'discourages' this style and would
like you to write:
for_each_so
On Thu, Mar 15, 2018 at 11:31:57AM +0100, Daniel Vetter wrote:
> Is there any progress on getting cross-release enabled again?
Not yet, I'm still fighting the meltdown/spectre induced backlog.
We'll get to it eventually.
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On Wed, Apr 11, 2018 at 09:26:11AM -0700, Francisco Jerez wrote:
> "just like" here is possibly somewhat unfair to the schedutil governor,
> admittedly its progressive IOWAIT boosting behavior seems somewhat less
> wasteful than the intel_pstate non-HWP governor's IOWAIT boosting
> behavior, but it
deadlock discovery to the first action when taking the ww_mutex.
> >
> > Testcase: igt/kms_cursor_legacy
I've no idea what this tag is or where to find the actual testcase, so
I've killed it.
> > Suggested-by: Maarten Lankhorst
> > Signed-off-by: Chris Wilson
On Mon, May 30, 2016 at 11:43:31AM +0200, Maarten Lankhorst wrote:
> Patch not applied, SCHED_RR:
ww_mutex isn't RT aware at all; its one of the things I still have on a
todo list. Should I look harder at finding time for this?
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On Tue, Nov 08, 2016 at 11:44:03AM +0100, Daniel Vetter wrote:
> On Tue, Nov 08, 2016 at 03:25:41PM +1100, Stephen Rothwell wrote:
> > Hi all,
> >
> > FIXME: Add owner of second tree to To:
> >Add author(s)/SOB of conflicting commits.
> >
> > Today's linux-next merge of the tip tree got a
On Tue, Nov 08, 2016 at 05:09:16PM +0100, Daniel Vetter wrote:
> > You're talking about:
> >
> > lkml.kernel.org/r/20161007154351.gl3...@twins.programming.kicks-ass.net
> >
> > ? I got no feedback from you DRM guys on that so I kinda forgot about
> > that in the hope we'd not have to do this at
On Tue, Nov 08, 2016 at 05:09:16PM +0100, Daniel Vetter wrote:
> > Now, I know you're working on getting rid of this entirely for i915, but
> > what about that MSM driver? Will we continue to need it there, is
> > anybody actually maintaining that thing?
>
> Rob Clark is, and since he's a one-man
On Mon, Feb 15, 2016 at 02:36:43PM +0200, Joonas Lahtinen wrote:
> Instead of implementing a custom locked reference counting, use lockref.
>
> Current implementation leads to a deadlock splat on Intel SKL platforms
> when lockdep debugging is enabled.
>
> This is due to few of CPUfreq drivers (i
On Mon, Feb 15, 2016 at 03:17:55PM +0100, Peter Zijlstra wrote:
> On Mon, Feb 15, 2016 at 02:36:43PM +0200, Joonas Lahtinen wrote:
> > Instead of implementing a custom locked reference counting, use lockref.
> >
> > Current implementation leads to a deadlock splat on Intel S
On Tue, Feb 16, 2016 at 10:49:36AM +0200, Joonas Lahtinen wrote:
> I originally thought of implementing this more similar to what you
> specify, but then I came across a discussion in the mailing list where
> it was NAKed adding more members to task_struct;
>
> http://comments.gmane.org/gmane.linu
On Tue, Feb 16, 2016 at 12:51:03PM +0200, Joonas Lahtinen wrote:
> Quoting my original patch;
>
> "See the Bugzilla link for more details.
If its not in the Changelog it doesn't exist. Patches should be self
contained and not refer to external sources for critical information.
___
On Wed, Feb 17, 2016 at 02:47:31PM +0200, Joonas Lahtinen wrote:
> On ti, 2016-02-16 at 12:07 +0100, Peter Zijlstra wrote:
> > On Tue, Feb 16, 2016 at 12:51:03PM +0200, Joonas Lahtinen wrote:
> > > Quoting my original patch;
> > >
> > > "See the Bugzilla l
On Wed, Feb 17, 2016 at 05:13:21PM +0100, Daniel Vetter wrote:
> And for context we're hitting this on CI in a bunch of our machines, which
What's CI ?
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On Wed, Feb 17, 2016 at 05:33:51PM +0100, Daniel Vetter wrote:
> On Wed, Feb 17, 2016 at 05:14:57PM +0100, Peter Zijlstra wrote:
> > On Wed, Feb 17, 2016 at 05:13:21PM +0100, Daniel Vetter wrote:
> > > And for context we're hitting this on CI in a bunch of our machines, w
On Tue, Sep 29, 2015 at 03:39:03PM +0100, Robert Bragg wrote:
> - We're bridging two complex architectures
>
> To review this work I think it will be relevant to have a good
> general familiarity with Gen graphics (e.g. thinking about the OA
> unit's interaction with the command stream
On Fri, Oct 16, 2015 at 12:02:28PM +0200, Ingo Molnar wrote:
>
> * Peter Zijlstra wrote:
>
> > > - We may be making some technical compromises a.t.m for the sake of
> > > using perf.
> > >
> > > perf_event_open() requires events to either rel
On Tue, Jan 05, 2016 at 03:59:51PM +0100, Daniel Vetter wrote:
> On Wed, Dec 23, 2015 at 01:35:54PM +, Chris Wilson wrote:
> > If we enable RCU for the requests (providing a grace period where we can
> > inspect a "dead" request before it is freed), we can allow callers to
> > carefully perform
On Tue, Jan 05, 2016 at 04:02:13PM +0100, Peter Zijlstra wrote:
> > Shouldn't the slab subsystem do this for us if we request it delays the
> > actual kfree? Seems like a core bug to me ... Adding more folks.
>
> note that sync_rcu() can take a terribly long time.. but ye
On Wed, Jan 06, 2016 at 09:06:58AM +0100, Daniel Vetter wrote:
> This pretty much went over my head ;-) What I naively hoped for is that
> kfree() on an rcu-freeing slab could be tought to magically stall a bit
> (or at least expedite the delayed freeing) if we're piling up too many
> freed objects
On Tue, Jun 06, 2017 at 02:14:18PM +0200, Michal Hocko wrote:
> That is certainly desirable. Peter has proposed a generic pin_page (or
> similar) API. What happened with it?
I got stuck on converting IB ... and I think someone thereafter made an
ever bigger mess of the pinning stuff. I don't know,
On Sat, Jul 15, 2017 at 11:53:28AM +0200, Daniel Vetter wrote:
> A more complete solution would be to do the mutex_init in the drm core
> only for legacy drivers, plus add it to each modern driver that still
> needs it, which would also give each its own lockdep key. Trying to do
> that dynamically
On Mon, Jul 17, 2017 at 05:06:42PM +0200, Daniel Vetter wrote:
> On Mon, Jul 17, 2017 at 11:35 AM, Peter Zijlstra wrote:
> > On Sat, Jul 15, 2017 at 11:53:28AM +0200, Daniel Vetter wrote:
> >> A more complete solution would be to do the mutex_init in the drm core
> >&
On Fri, Oct 06, 2017 at 11:06:37AM +0200, Daniel Vetter wrote:
> I pondered whether we should annotate engine->submit_request as __rcu
> and use rcu_assign_pointer and rcu_dereference on it. But the reason
> behind those is to make sure the compiler/cpu barriers are there for
> when you have an ac
On Fri, Oct 06, 2017 at 12:12:41PM +0200, Thomas Gleixner wrote:
> So if you don't have a compelling technical reason to
> use it, then it _is_ the wrong tool.
This. stop_machine() effectively takes down _all_ CPUs for the duration
of your callback. That is something you really should avoid at pre
On Mon, Aug 21, 2017 at 04:03:31PM +0100, Chris Wilson wrote:
> My googlefu says "[RFC][PATCH 1/5] mm: Introduce VM_PINNED and
> interfaces" is the series, and it certainly targets the very same
> problem.
>
> Peter, is that the latest version?
Probably, I ran into the Infiniband code and couldn'
On Sat, Aug 12, 2017 at 02:15:13AM +, Rogozhkin, Dmitry V wrote:
> $ perf stat -e instructions,i915/rcs0-busy/ workload.sh
> <... wrokload.sh output...>
>
> Performance counter stats for 'workload.sh':
> 1,204,616,268 instructions
> 0 i915/rcs0-busy/
>
>
On Wed, Aug 23, 2017 at 05:51:38PM +, Rogozhkin, Dmitry V wrote:
> https://patchwork.freedesktop.org/patch/171953/. This patch makes 'perf
> stat -e i915/rcs0-busy/' to error out and supports 'perf stat -e
> i915/rcs0-busy/ -a -C0'. I still think I miss something since 'perf stat
> -e i915/rcs
On Wed, Aug 23, 2017 at 05:51:38PM +, Rogozhkin, Dmitry V wrote:
> > The above command tries to add an event 'i915/rcs0-busy/' to a task. How
> > are i915 resource associated to any one particular task?
>
> Currently in no way, they are global.
Right. So no per DRM context things. Can you ha
On Wed, Aug 23, 2017 at 05:51:38PM +, Rogozhkin, Dmitry V wrote:
> And there is another problem associated with the "perf stat -e
> -a": since 8 events are initialized, I get metric values multiplied by
> 8. How I am supposed to fix that? I suspect that this is somehow related
> to cpumask att
On Wed, Aug 23, 2017 at 05:51:38PM +, Rogozhkin, Dmitry V wrote:
> Anyhow, returning to the metrics i915 exposes. Some metrics are just
> exposure of some counters supported already inside i915 PMU which do not
> require any special sampling: at any given moment you can request the
> counter v
On Wed, Aug 23, 2017 at 06:38:05PM +, Rogozhkin, Dmitry V wrote:
> On Wed, 2017-08-23 at 20:04 +0200, Peter Zijlstra wrote:
> > On Wed, Aug 23, 2017 at 05:51:38PM +, Rogozhkin, Dmitry V wrote:
> >
> > > > The above command tries to add an event 'i915/rcs0-b
On Wed, Aug 23, 2017 at 07:00:33PM +, Rogozhkin, Dmitry V wrote:
> On Wed, 2017-08-23 at 20:22 +0200, Peter Zijlstra wrote:
> > On Wed, Aug 23, 2017 at 05:51:38PM +, Rogozhkin, Dmitry V wrote:
> >
> > > Anyhow, returning to the metrics i915 exposes. Some metrics ar
On Wed, Aug 23, 2017 at 11:38:43PM +, Rogozhkin, Dmitry V wrote:
> On Wed, 2017-08-23 at 08:26 -0700, Dmitry Rogozhkin wrote:
> > +static cpumask_t i915_pmu_cpumask = CPU_MASK_CPU0;
>
> Peter, this hardcoding of cpumask to use CPU0 works, but should I
> implement something smarter or this will
On Mon, Aug 28, 2017 at 10:43:17PM +, Rogozhkin, Dmitry V wrote:
> Hi Peter,
>
> I have updated my fixes to Tvrtko's PMU, they are here:
> https://patchwork.freedesktop.org/series/28842/, and I started to check
> whether we will be able to cover all the use cases for this PMU which we
> had in
On Tue, Aug 29, 2017 at 07:16:31PM +, Rogozhkin, Dmitry V wrote:
> > Pretty strict, people tend to get fairly upset every time we leak stuff.
> > In fact Debian and Android carry a perf_event_paranoid patch that
> > default disables _everything_ :-(
>
> Can you say more on that for Debian and
On Wed, Aug 23, 2017 at 11:43:13PM +, Rogozhkin, Dmitry V wrote:
> Hi Chris,
>
> Why we had event->hw->hrtimer in i915 PMU? Was there any particular
> reason? You had some use case which did not work?
Some uncore drivers have a hrtimer to poll the counter to deal with
counter overflow. This i
On Wed, Aug 30, 2017 at 05:24:30PM +, Rogozhkin, Dmitry V wrote:
> I figured out how to track cpus online/offline status in PMU. Here is a
> question however. What is the reason for uncore PMUs (cstate.c for
> example) to register for cpus other than cpu0? I see it registers for
> first thread
On Wed, Aug 30, 2017 at 05:24:30PM +, Rogozhkin, Dmitry V wrote:
> Ok... but they could register for just cpu0. Besides, it looks like on
> Linux cpu0 can't go offline at all at least of x86 architecture. Peter,
> could you, please, clarify the reasoning to register designated readers
> of unco
On Thu, Jan 18, 2018 at 06:40:07PM +, Tvrtko Ursulin wrote:
> From: Tvrtko Ursulin
>
> For situations where sysadmins might want to allow different level of
> of access control for different PMUs, we start creating per-PMU
> perf_event_paranoid controls in sysfs.
You've completely and utterl
On Sun, Mar 12, 2017 at 09:53:40PM +0100, Daniel Vetter wrote:
> Peter/Ingo,
>
> We want this to validate the i915 shrinker locking in our fast tests
> without thrashing badly (that takes too long, we can only thrash in
> the extended runs). Can you pls take a look and if it's ok ack for
> mergin
On Mon, Mar 13, 2017 at 09:15:17AM +0100, Daniel Vetter wrote:
> On Mon, Mar 13, 2017 at 09:01:57AM +0100, Peter Zijlstra wrote:
> > On Sun, Mar 12, 2017 at 09:53:40PM +0100, Daniel Vetter wrote:
> >
> > > Peter/Ingo,
> > >
> > > We want this to vali
On Wed, Jan 18, 2023 at 04:35:22PM +0100, Andrzej Hajda wrote:
> Andrzej Hajda (7):
> arch: rename all internal names __xchg to __arch_xchg
> linux/include: add non-atomic version of xchg
> arch/*/uprobes: simplify arch_uretprobe_hijack_return_addr
> llist: simplify __llist_del_all
> io_
On Thu, Feb 23, 2023 at 10:24:19PM +0100, Andrzej Hajda wrote:
> On 22.02.2023 18:04, Peter Zijlstra wrote:
> > On Wed, Jan 18, 2023 at 04:35:22PM +0100, Andrzej Hajda wrote:
> >
> > > Andrzej Hajda (7):
> > >arch: rename all internal names __xchg to __arch
On Tue, Oct 25, 2022 at 07:52:07AM +0300, Ville Syrjälä wrote:
> On Fri, Oct 21, 2022 at 08:22:41PM +0300, Ville Syrjälä wrote:
> > On Mon, Aug 22, 2022 at 01:18:22PM +0200, Peter Zijlstra wrote:
> > > +#ifdef CONFIG_LOCKDEP
> > > + /*
> > > + * It's dang
On Wed, Oct 26, 2022 at 01:32:31PM +0300, Ville Syrjälä wrote:
> Short form looks to be this:
> <4>[ 355.437846] 1 lock held by rs:main Q:Reg/359:
> <4>[ 355.438418] #0: 88844693b758 (&rq->__lock){-.-.}-{2:2}, at:
> raw_spin_rq_lock_nested+0x1b/0x30
> <4>[ 355.438432] rs:main Q:Reg/359 hol
On Wed, Oct 26, 2022 at 01:43:00PM +0200, Peter Zijlstra wrote:
> On Wed, Oct 26, 2022 at 01:32:31PM +0300, Ville Syrjälä wrote:
> > Short form looks to be this:
> > <4>[ 355.437846] 1 lock held by rs:main Q:Reg/359:
> > <4>[ 355.438418] #0: 88844693b
On Wed, Oct 26, 2022 at 02:12:02PM +0200, Peter Zijlstra wrote:
> On Wed, Oct 26, 2022 at 01:43:00PM +0200, Peter Zijlstra wrote:
> > On Wed, Oct 26, 2022 at 01:32:31PM +0300, Ville Syrjälä wrote:
> > > Short form looks to be this:
> > > <4>[ 355.437846] 1 lock he
On Thu, Oct 27, 2022 at 01:58:09PM +0800, Chen Yu wrote:
> > It's a very narrow race between schedule() and task_call_func().
> >
> > CPU0 CPU1
> >
> > __schedule()
> > rq_lock();
> > prev_state = READ_ONCE(prev->__state);
> > if (...
On Thu, Oct 27, 2022 at 04:09:01PM +0300, Ville Syrjälä wrote:
> On Wed, Oct 26, 2022 at 01:43:00PM +0200, Peter Zijlstra wrote:
> > Could you please give the below a spin?
>
> Thanks. I've added this to our CI branch. I'll try to keep and eye
> on it in the com
On Wed, Nov 02, 2022 at 06:57:51PM +0200, Ville Syrjälä wrote:
> On Thu, Oct 27, 2022 at 06:53:23PM +0200, Peter Zijlstra wrote:
> > On Thu, Oct 27, 2022 at 04:09:01PM +0300, Ville Syrjälä wrote:
> > > On Wed, Oct 26, 2022 at 01:43:00PM +0200, Peter Zijlstra wrote:
> >
On Fri, Jan 13, 2023 at 12:30:16PM -0700, Jim Cromie wrote:
> __jump_label_patch currently will "crash the box" if it finds a
> jump_entry not as expected. ISTM this overly harsh; it doesn't
> distinguish between "alternate/opposite" state, and truly
> "insane/corrupted".
>
> The "opposite" (but
On Wed, Jan 25, 2023 at 12:38:46AM -0800, Suren Baghdasaryan wrote:
> diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
> index 2d6d790d9bed..6c7c70bf50dd 100644
> --- a/include/linux/mm_types.h
> +++ b/include/linux/mm_types.h
> @@ -491,7 +491,13 @@ struct vm_area_struct {
>
On Tue, Jul 23, 2024 at 10:30:08AM -0500, Lucas De Marchi wrote:
> On Tue, Jul 23, 2024 at 09:03:25AM GMT, Tvrtko Ursulin wrote:
> >
> > On 22/07/2024 22:06, Lucas De Marchi wrote:
> > > Instead of calling perf_pmu_unregister() when unbinding, defer that to
> > > the destruction of i915 object. Si
On Fri, May 03, 2024 at 11:37:25AM +0200, Christian Brauner wrote:
> On Thu, May 02, 2024 at 05:41:23PM -0700, Kees Cook wrote:
> > On Fri, May 03, 2024 at 01:14:45AM +0100, Al Viro wrote:
> > > On Thu, May 02, 2024 at 05:10:18PM -0700, Kees Cook wrote:
> > >
> > > > But anyway, there needs to be
On Wed, Feb 26, 2014 at 02:57:16PM +0100, Rafael J. Wysocki wrote:
> On Monday, February 24, 2014 05:24:00 PM Borislav Petkov wrote:
> > This started happening this morning after booting -rc4+tip, let's
> > add *everybody* to CC :-)
>
> What about -rc4 without tip?
The driver causing this is new
On Thu, Feb 27, 2014 at 11:12:32AM +0100, Stephane Eranian wrote:
> As a asides, my SNB and HSW desktops with 3.14-rc4 are totally unstable.
> They hang if I type make in my kernel tree. Whereas 3.14-rc3 is stable. I am
> not so sure this is all related to the uncore IMC support, though.
Unstable
On Thu, Feb 27, 2014 at 11:32:58AM +0100, Stephane Eranian wrote:
> On Thu, Feb 27, 2014 at 11:30 AM, Peter Zijlstra wrote:
> > On Thu, Feb 27, 2014 at 11:12:32AM +0100, Stephane Eranian wrote:
> >> As a asides, my SNB and HSW desktops with 3.14-rc4 are totally unstable.
> &g
On Thu, Sep 12, 2013 at 05:36:43PM +0200, Daniel Vetter wrote:
> The set_need_resched in i915_gem.c:i915_gem_fault can actually be
> removed. It was there to give the error handler a chance to sneak in
> and reset the hw/sw tracking when the gpu is dead. That hack goes back
> to the days when the l
On Thu, Sep 12, 2013 at 05:58:49PM +0200, Daniel Vetter wrote:
> On Thu, Sep 12, 2013 at 5:43 PM, Peter Zijlstra wrote:
> >> The one in ttm is just bonghits to shut up lockdep: ttm can recurse
> >> into it's own pagefault handler and then deadlock, the trylock just
>
Hi Dave,
So I'm poking around the preemption code and stumbled upon:
drivers/gpu/drm/i915/i915_gem.c:set_need_resched();
drivers/gpu/drm/ttm/ttm_bo_vm.c:set_need_resched();
drivers/gpu/drm/ttm/ttm_bo_vm.c:set_need_resched();
drivers/
no other
> reason for this just drop it.
>
> Reported-by: Peter Zijlstra
Thanks!
Acked-by: Peter Zijlstra
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> rip the reschedule-point out.
>
> Reported-by: Peter Zijlstra
Thanks!
Acked-by: Peter Zijlstra
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On Thu, Sep 12, 2013 at 05:11:25PM +0200, Maarten Lankhorst wrote:
> Op 12-09-13 17:06, Peter Zijlstra schreef:
> > Hi Dave,
> >
> > So I'm poking around the preemption code and stumbled upon:
> >
> > drivers/gpu/drm/i915/i915_gem.c:set_n
On Thu, Sep 12, 2013 at 05:35:43PM +0100, Chris Wilson wrote:
> Not quite, as it would be possible for the evil userspace to trigger a
> GPU hang that would cause the sane userspace to spin indefinitely
> waiting for the error recovery to kick in.
So with FIFOn+1 preempting FIFOn its a live-lock
On Fri, Sep 13, 2013 at 09:46:03AM +0200, Thomas Hellstrom wrote:
> >>if (!bo_tryreserve()) {
> >> up_read mmap_sem(); // Release the mmap_sem to avoid deadlocks.
> >> bo_reserve(); // Wait for the BO to become available
> >> (interruptible)
> >> bo_unreserve();
On Fri, Sep 13, 2013 at 10:41:54AM +0200, Daniel Vetter wrote:
> On Fri, Sep 13, 2013 at 10:29 AM, Peter Zijlstra wrote:
> > On Fri, Sep 13, 2013 at 09:46:03AM +0200, Thomas Hellstrom wrote:
> >> >>if (!bo_tryreserve()) {
> >> >> up_read mmap_sem(); //
On Tue, Apr 07, 2015 at 01:27:21PM -0700, Andrew Morton wrote:
> On Tue, 7 Apr 2015 17:31:36 +0100 Chris Wilson
> wrote:
>
> > In preparation for exporting very similar functionality through another
> > interface, gut the current remap_pfn_range(). The motivating factor here
> > is to reuse the
On Tue, Sep 29, 2015 at 10:55:39PM +0800, kbuild test robot wrote:
> Hi Robert,
>
> [auto build test results on v4.3-rc3 -- if it's inappropriate base, please
> ignore]
>
> config: i386-defconfig (attached as .config)
> reproduce:
> git checkout a1d59679ae8f3e7e7659e9723ae3fc69af2532e6
> # s
So I've not yet went through the entire series; but I'm wondering if its
at all possible to re-use some of this work:
lkml.kernel.org/r/1428453299-19121-1-git-send-email-suka...@linux.vnet.ibm.com
That's for a Power8 HV call that can basically return an array of
values; which on a superficial le
On Thu, May 07, 2015 at 03:15:43PM +0100, Robert Bragg wrote:
> I've changed the uapi for configuring the i915_oa specific attributes
> when calling perf_event_open(2) whereby instead of cramming lots of
> bitfields into the perf_event_attr config members, I'm now
> daisy-chaining a drm_i915_oa_ev
On Fri, May 15, 2015 at 02:07:29AM +0100, Robert Bragg wrote:
> On Fri, May 8, 2015 at 5:24 PM, Peter Zijlstra wrote:
> > On Thu, May 07, 2015 at 03:15:43PM +0100, Robert Bragg wrote:
> >
> >> I've changed the uapi for configuring the i915_oa specific attributes
>
On Thu, May 21, 2015 at 12:17:48AM +0100, Robert Bragg wrote:
> >
> > So for me the 'natural' way to represent this in perf would be through
> > event groups. Create a perf event for every single event -- yes this is
> > 53 events.
>
> So when I was first looking at this work I had considered the
On Tue, Dec 10, 2024 at 06:00:33PM -0600, Lucas De Marchi wrote:
> raw_spin_lock_init(&guc->timestamp.lock);
> raw_spin_lock_init(&pmu->lock);
> raw_spin_lock_init(&i915->mmio_debug.lock);
> raw_spin_lock_init(&uncore->lock);
>
> And it's still not sufficient, because inte
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