for the pointer! :)
It needs not a CPP macro but an assembly macro.
OK, I'll try that.
Thanks again,
--
Masami HIRAMATSU
IT Management Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu...@hitachi.com
(2013/11/27 22:30), Ingo Molnar wrote:
* Masami Hiramatsu masami.hiramatsu...@hitachi.com wrote:
(2013/11/22 11:35), Masami Hiramatsu wrote:
(2013/11/21 16:29), Ingo Molnar wrote:
* Masami Hiramatsu masami.hiramatsu...@hitachi.com wrote:
(2013/11/21 2:36), Frank Ch. Eigler wrote
(2013/11/27 22:32), Ingo Molnar wrote:
* Masami Hiramatsu masami.hiramatsu...@hitachi.com wrote:
+#ifdef CONFIG_KPROBES
+/*
+ * Blacklist ganerating macro. Specify functions which is not probed
+ * by using this macro.
+ */
+#define __NOKPROBE_SYMBOL(fname
(2013/11/23 6:21), Andi Kleen wrote:
On Wed, Nov 20, 2013 at 04:22:21AM +, Masami Hiramatsu wrote:
Use NOKPROBE_SYMBOL macro to protect functions from kprobes
instead of __kprobes annotation in trap.c.
This also applies __always_inline annotation for some cases,
because NOKPROBE_SYMBOL
(2013/11/23 6:21), Andi Kleen wrote:
On Wed, Nov 20, 2013 at 04:22:21AM +, Masami Hiramatsu wrote:
Use NOKPROBE_SYMBOL macro to protect functions from kprobes
instead of __kprobes annotation in trap.c.
This also applies __always_inline annotation for some cases,
because NOKPROBE_SYMBOL
(2013/11/22 11:35), Masami Hiramatsu wrote:
(2013/11/21 16:29), Ingo Molnar wrote:
* Masami Hiramatsu masami.hiramatsu...@hitachi.com wrote:
(2013/11/21 2:36), Frank Ch. Eigler wrote:
[ ... ]
one needs to resort to something like:
# cat /proc/kallsyms | grep ' [tT] ' | while read addr
(2013/11/21 20:30), Ingo Molnar wrote:
* Masami Hiramatsu masami.hiramatsu...@hitachi.com wrote:
Use NOKPROBE_SYMBOL macro for protecting functions
from kprobes instead of __kprobes annotation in
dumpstack.c.
Signed-off-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Cc: Thomas
(2013/11/21 16:29), Ingo Molnar wrote:
* Masami Hiramatsu masami.hiramatsu...@hitachi.com wrote:
(2013/11/21 2:36), Frank Ch. Eigler wrote:
[ ... ]
one needs to resort to something like:
# cat /proc/kallsyms | grep ' [tT] ' | while read addr type symbol; do
perf probe $symbol
done
it is good to fix all such bugs
in this series.
This is just the first step to do it. :)
Thank you,
--
Masami HIRAMATSU
IT Management Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu...@hitachi.com
.
- Add blacklist on modules support.
- Add debugfs interface for blacklist.
- Fix indent of the NOKPROBE_SYMBOL() by using tabs.
- Fix NOKPROBE_SYMBOL() for expanding nested macro.
- Update Documentations/kprobes.txt about blacklist.
---
Masami Hiramatsu (23):
kprobes: Prohibit probing
events/kprobes/foo/enable
# echo -:foo kprobe_events
# head -n 20 trace
# echo 0 events/kprobes/enable
# echo kprobe_events
# echo trace
Signed-off-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Cc: Thomas Gleixner t...@linutronix.de
Cc: Ingo Molnar mi...@redhat.com
Cc: H. Peter Anvin h
()
Signed-off-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Cc: Ananth N Mavinakayanahalli ana...@in.ibm.com
Cc: David S. Miller da...@davemloft.net
Cc: Rob Landley r...@landley.net
Cc: Rusty Russell ru...@rustcorp.com.au
---
Documentation/kprobes.txt |8
include/linux/module.h
Show blacklist entries (function names with the address
range) via /sys/kernel/debug/kprobes/blacklist.
Signed-off-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Cc: Ananth N Mavinakayanahalli ana...@in.ibm.com
Cc: David S. Miller da...@davemloft.net
---
kernel/kprobes.c | 61
Use NOKPROBE_SYMBOL() to protect handlers from kprobes
in sample modules.
Signed-off-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Ananth N Mavinakayanahalli ana...@in.ibm.com
---
samples/kprobes/jprobe_example.c|1 +
samples/kprobes/kprobe_example.c|3 +++
samples/kprobes
the blacklist.
Changes from previous:
- Introduce arch_within_kprobe_blacklist() which checks
the address is within the .kprobes.text (generic,x86) or
.entry.text (x86), for fixing build issue on !x86.
Signed-off-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Cc: Thomas Gleixner t
.
Changes from previous version:
- Rename in_nokprobes_functions to within_kprobe_blacklist
and it returns a bool value istead of an error.
Signed-off-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Cc: Ananth N Mavinakayanahalli ana...@in.ibm.com
Cc: David S. Miller da...@davemloft.net
Cc
Use NOKPROBE_SYMBOL macro for protecting functions
from kprobes instead of __kprobes annotation in x86
kprobes code.
This applies __always_inline annotation for some cases,
because NOKPROBE_SYMBOL() will inhibit inlining by
referring the symbol address.
Signed-off-by: Masami Hiramatsu
unregister_kprobe
__unregister_kprobe_bottom
unregister_kprobes
__unregister_kprobe_top
unregister_kretprobe
unregister_kretprobe
unregister_kretprobes
unregister_kretprobes
wait_for_kprobe_optimizer
Signed-off-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Cc: Ananth N Mavinakayanahalli ana
Use NOKPROBE_SYMBOL macro to protect functions from
kprobes instead of __kprobes annotation in ftrace.
This applies __always_inline annotation for some cases,
because NOKPROBE_SYMBOL() will inhibit inlining by
referring the symbol address.
Signed-off-by: Masami Hiramatsu masami.hiramatsu
.
update_bitfield_fetch_param
free_bitfield_fetch_param
kprobe_register
Signed-off-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Cc: Steven Rostedt rost...@goodmis.org
Cc: Frederic Weisbecker fweis...@gmail.com
Cc: Ingo Molnar mi...@redhat.com
---
kernel/trace/trace_kprobe.c |2 +-
kernel/trace
Use NOKPROBE_SYMBOL macro to protect functions from kprobes
instead of __kprobe annotation in hw_breakpoint.
Signed-off-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Cc: Thomas Gleixner t...@linutronix.de
Cc: Ingo Molnar mi...@redhat.com
Cc: H. Peter Anvin h...@zytor.com
Cc: Andrew Morton
Use NOKPROBE_SYMBOL macro to protect functions from kprobes
instead of __kprobes annotation in fault.c.
This applies __always_inline annotation for some cases,
because NOKPROBE_SYMBOL() will inhibit inlining by
referring the symbol address.
Signed-off-by: Masami Hiramatsu masami.hiramatsu
Use NOKPROBE_SYMBOL macro to protect functions from kprobes
instead of __kprobes annotation in alternative.c.
Signed-off-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Cc: Thomas Gleixner t...@linutronix.de
Cc: Ingo Molnar mi...@redhat.com
Cc: H. Peter Anvin h...@zytor.com
Cc: Jiri Kosina
Use NOKPROBE_SYMBOL macro to protect functions from kprobes
instead of __kprobes annotation in trap.c.
This also applies __always_inline annotation for some cases,
because NOKPROBE_SYMBOL() will inhibit inlining by referring
the symbol address.
Signed-off-by: Masami Hiramatsu masami.hiramatsu
Use NOKPROBE_SYMBOL macro for protecting functions
from kprobes instead of __kprobes annotation in kvm.c.
This also adds kvm_read_and_reset_pf_reason in
the blacklist because it can be called before
do_page_fault.
Signed-off-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Cc: Thomas Gleixner
Use NOKPROBE_SYMBOL macro to protect functions from
kprobes instead of __kprobes annotation for nmi handlers.
Signed-off-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Cc: Thomas Gleixner t...@linutronix.de
Cc: Ingo Molnar mi...@redhat.com
Cc: H. Peter Anvin h...@zytor.com
Cc: Peter
Use NOKPROBE_SYMBOL macro for protecting functions
from kprobes instead of __kprobes annotation in
dumpstack.c.
Signed-off-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Cc: Thomas Gleixner t...@linutronix.de
Cc: Ingo Molnar mi...@redhat.com
Cc: H. Peter Anvin h...@zytor.com
Cc: Andrew
with CONFIG_DEBUG_NOTIFIERS=y.
Signed-off-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Cc: Andrew Morton a...@linux-foundation.org
Cc: Uwe Kleine-König u.kleine-koe...@pengutronix.de
Cc: Borislav Petkov b...@suse.de
Cc: Ingo Molnar mi...@kernel.org
---
kernel/extable.c |2 ++
1 file changed
Use NOKPROBE_SYMBOL macro to protect functions from
kprobes instead of __kprobes annotation in sched/core.c.
Signed-off-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Cc: Ingo Molnar mi...@redhat.com
Cc: Peter Zijlstra pet...@infradead.org
---
kernel/sched/core.c |6 --
1 file
Use NOKPROBE_SYMBOL macro to protect functions from
kprobes instead of __kprobes annotation in notifier.
Signed-off-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
---
kernel/notifier.c | 22 +-
1 file changed, 13 insertions(+), 9 deletions(-)
diff --git a/kernel
Use kprobe_blackpoint for blacklisting .entry.text and .kprobes.text
instead of arch_within_kprobe_blacklist. This also makes them visible
via (debugfs)/kprobes/blacklist.
Signed-off-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Cc: Thomas Gleixner t...@linutronix.de
Cc: Ingo Molnar mi
(2013/11/16 2:46), Geert Uytterhoeven wrote:
On Fri, Nov 15, 2013 at 5:43 PM, Steven Rostedt rost...@goodmis.org wrote:
On Fri, 15 Nov 2013 04:53:18 +
Masami Hiramatsu masami.hiramatsu...@hitachi.com wrote:
.entry.text is a code area which is used for interrupt/syscall
entries
the blacklist.
Signed-off-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Cc: Thomas Gleixner t...@linutronix.de
Cc: Ingo Molnar mi...@redhat.com
Cc: H. Peter Anvin h...@zytor.com
Cc: Ananth N Mavinakayanahalli ana...@in.ibm.com
Cc: Al Viro v...@zeniv.linux.org.uk
Cc: Seiji Aguchi seiji.agu...@hds.com
Cc
.
Changes from previous version:
- fix indent of the macro by using tabs.
- fix macro for expanding nested macro.
- update Documentations/kprobes.txt
Signed-off-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Cc: Ananth N Mavinakayanahalli ana...@in.ibm.com
Cc: David S. Miller da
nested macro.
- Update Documentations/kprobes.txt about blacklist.
---
Masami Hiramatsu (22):
kprobes: Prohibit probing on .entry.text code
kprobes: Introduce NOKPROBE_SYMBOL() macro for blacklist
kprobes: Show blacklist entries via debugfs
kprobes: Support blacklist functions
To blacklist the functions in a module (e.g. user-defined
kprobe handler and the functions invoked from it), expand
blacklist support for modules.
With this change, users can use NOKPROBE_SYMBOL() macro in
their own modules.
Signed-off-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Cc
Show blacklist entries (function names with the address
range) via /sys/kernel/debug/kprobes/blacklist.
Signed-off-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Cc: Ananth N Mavinakayanahalli ana...@in.ibm.com
Cc: David S. Miller da...@davemloft.net
---
kernel/kprobes.c | 61
Use NOKPROBE_SYMBOL() to protect handlers from kprobes
in sample modules.
Signed-off-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Ananth N Mavinakayanahalli ana...@in.ibm.com
---
samples/kprobes/jprobe_example.c|1 +
samples/kprobes/kprobe_example.c|3 +++
samples/kprobes
.
update_bitfield_fetch_param
free_bitfield_fetch_param
kprobe_register
Signed-off-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Cc: Steven Rostedt rost...@goodmis.org
Cc: Frederic Weisbecker fweis...@gmail.com
Cc: Ingo Molnar mi...@redhat.com
---
kernel/trace/trace_kprobe.c |2 +-
kernel/trace
events/kprobes/foo/enable
# echo -:foo kprobe_events
# head -n 20 trace
# echo 0 events/kprobes/enable
# echo kprobe_events
# echo trace
Signed-off-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Cc: Thomas Gleixner t...@linutronix.de
Cc: Ingo Molnar mi...@redhat.com
Cc: H. Peter Anvin h
Use NOKPROBE_SYMBOL macro to protect functions from
kprobes instead of __kprobes annotation.
Signed-off-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Cc: Ananth N Mavinakayanahalli ana...@in.ibm.com
Cc: David S. Miller da...@davemloft.net
---
kernel/kprobes.c | 67
Use NOKPROBE_SYMBOL macro to protect functions from
kprobes instead of __kprobes annotation in ftrace.
This applies __always_inline annotation for some cases,
because NOKPROBE_SYMBOL() will inhibit inlining by
referring the symbol address.
Signed-off-by: Masami Hiramatsu masami.hiramatsu
unregister_kprobe
__unregister_kprobe_bottom
unregister_kprobes
__unregister_kprobe_top
unregister_kretprobe
unregister_kretprobe
unregister_kretprobes
unregister_kretprobes
wait_for_kprobe_optimizer
Signed-off-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Cc: Ananth N Mavinakayanahalli ana
Use NOKPROBE_SYMBOL macro for protecting functions
from kprobes instead of __kprobes annotation in x86
kprobes code.
This applies __always_inline annotation for some cases,
because NOKPROBE_SYMBOL() will inhibit inlining by
referring the symbol address.
Signed-off-by: Masami Hiramatsu
Use NOKPROBE_SYMBOL macro to protect functions from kprobes
instead of __kprobe annotation in hw_breakpoint.
Signed-off-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Cc: Thomas Gleixner t...@linutronix.de
Cc: Ingo Molnar mi...@redhat.com
Cc: H. Peter Anvin h...@zytor.com
Cc: Andrew Morton
Use NOKPROBE_SYMBOL macro to protect functions from kprobes
instead of __kprobes annotation in fault.c.
This applies __always_inline annotation for some cases,
because NOKPROBE_SYMBOL() will inhibit inlining by
referring the symbol address.
Signed-off-by: Masami Hiramatsu masami.hiramatsu
Use NOKPROBE_SYMBOL macro to protect functions from
kprobes instead of __kprobes annotation for nmi handlers.
Signed-off-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Cc: Thomas Gleixner t...@linutronix.de
Cc: Ingo Molnar mi...@redhat.com
Cc: H. Peter Anvin h...@zytor.com
Cc: Peter
Use NOKPROBE_SYMBOL macro to protect functions from kprobes
instead of __kprobes annotation in alternative.c.
Signed-off-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Cc: Thomas Gleixner t...@linutronix.de
Cc: Ingo Molnar mi...@redhat.com
Cc: H. Peter Anvin h...@zytor.com
Cc: Jiri Kosina
Use NOKPROBE_SYMBOL macro to protect functions from kprobes
instead of __kprobes annotation in trap.c.
This also applies __always_inline annotation for some cases,
because NOKPROBE_SYMBOL() will inhibit inlining by referring
the symbol address.
Signed-off-by: Masami Hiramatsu masami.hiramatsu
Use NOKPROBE_SYMBOL macro for protecting functions
from kprobes instead of __kprobes annotation in kvm.c.
This also adds kvm_read_and_reset_pf_reason in
the blacklist because it can be called before
do_page_fault.
Signed-off-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Cc: Thomas Gleixner
Use NOKPROBE_SYMBOL macro to protect functions from
kprobes instead of __kprobes annotation in sched/core.c.
Signed-off-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Cc: Ingo Molnar mi...@redhat.com
Cc: Peter Zijlstra pet...@infradead.org
---
kernel/sched/core.c |6 --
1 file
with CONFIG_DEBUG_NOTIFIERS=y.
Signed-off-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Cc: Andrew Morton a...@linux-foundation.org
Cc: Uwe Kleine-König u.kleine-koe...@pengutronix.de
Cc: Borislav Petkov b...@suse.de
Cc: Ingo Molnar mi...@kernel.org
---
kernel/extable.c |2 ++
1 file changed
Use NOKPROBE_SYMBOL macro to protect functions from
kprobes instead of __kprobes annotation in notifier.
Signed-off-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
---
kernel/notifier.c | 22 +-
1 file changed, 13 insertions(+), 9 deletions(-)
diff --git a/kernel
.
Signed-off-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Cc: Thomas Gleixner t...@linutronix.de
Cc: Ingo Molnar mi...@redhat.com
Cc: H. Peter Anvin h...@zytor.com
Cc: Borislav Petkov b...@suse.de
Cc: Fenghua Yu fenghua...@intel.com
Cc: Seiji Aguchi seiji.agu...@hds.com
---
arch/x86/kernel/cpu
(2013/11/11 20:16), Ingo Molnar wrote:
* Masami Hiramatsu masami.hiramatsu...@hitachi.com wrote:
Currently the blacklist is maintained by hand in kprobes.c
which is separated from the function definition and is hard
to catch up the kernel update.
To solve this issue, I've tried
the blacklist.
Signed-off-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
---
arch/x86/kernel/entry_32.S | 33 -
arch/x86/kernel/entry_64.S | 20
kernel/kprobes.c | 10 +-
3 files changed, 5 insertions(+), 58 deletions(-)
diff
.
Signed-off-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
---
arch/x86/kernel/paravirt.c|4 ++
include/asm-generic/vmlinux.lds.h |9
include/linux/kprobes.h | 19
kernel/kprobes.c | 88 ++---
kernel
to ask again with actual implementation and plan.
Thank you,
---
Masami Hiramatsu (2):
kprobes: Prohibit probing on .entry.text code
kprobes: Introduce NOKPROBE_SYMBOL() macro for blacklist
arch/x86/kernel/entry_32.S| 33
arch/x86/kernel/entry_64.S
(), but the region is out of bound.
To avoid the case, a kernel should check whether pipe-nrbufs is empty or not
when splice_write is executed in the virtio-console driver.
Thank you for fixing it :)
Reviewed-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Signed-off-by: Yoshihiro YUNOMAE
a locking problem for error
Thanks, this looks good for me.
Reviewed-by: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Signed-off-by: Yoshihiro YUNOMAE yoshihiro.yunomae...@hitachi.com
Cc: Amit Shah amit.s...@redhat.com
Cc: Arnd Bergmann a...@arndb.de
Cc: Greg Kroah-Hartman gre
, but I can
change this to something like:
alloc_size = sizeof(*buf) + sizeof(buf-sg) * max(nrbufs - 1, 1);
You wouldn't need to change that. I think current code is enough simple
and reasonable. :)
Thanks!
--
Masami HIRAMATSU
Software Platform Research Dept. Linux Technology Center
Hitachi
amit.s...@redhat.com
cc: Linus Walleij linus.wall...@linaro.org
cc: Masami Hiramatsu masami.hiramatsu...@hitachi.com
---
drivers/char/virtio_console.c | 141
++---
1 files changed, 62 insertions(+), 79 deletions(-)
diff --git a/drivers/char/virtio_console.c
(2012/08/23 18:08), Steven Rostedt wrote:
On Thu, 2012-08-23 at 12:00 +0900, Masami Hiramatsu wrote:
(2012/08/23 11:01), Masami Hiramatsu wrote:
(2012/08/22 22:41), Steven Rostedt wrote:
On Wed, 2012-08-22 at 17:43 +0900, Yoshihiro YUNOMAE wrote:
From: Masami Hiramatsu masami.hiramatsu
(2012/08/22 22:41), Steven Rostedt wrote:
On Wed, 2012-08-22 at 17:43 +0900, Yoshihiro YUNOMAE wrote:
From: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Count debugfs/tracing/per_cpu/cpu* to determine the
number of CPUs.
I'm curious, do you find that sysconf doesn't return
(2012/08/23 11:01), Masami Hiramatsu wrote:
(2012/08/22 22:41), Steven Rostedt wrote:
On Wed, 2012-08-22 at 17:43 +0900, Yoshihiro YUNOMAE wrote:
From: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Count debugfs/tracing/per_cpu/cpu* to determine the
number of CPUs.
I'm curious, do you
,
--
Masami HIRAMATSU
Software Platform Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu...@hitachi.com
___
Virtualization mailing list
Virtualization@lists.linux-foundation.org
https
(2012/08/09 18:00), Amit Shah wrote:
On (Tue) 24 Jul 2012 [11:37:07], Yoshihiro YUNOMAE wrote:
From: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Enable to use splice_write from pipe to virtio-console port.
This steals pages from pipe and directly send it to host.
Note that this may
.
Perhaps, in the analyzing phase (after tracing), we have to mix events
again. At that time, we'll add some guest-ID for each event-ID, but
it can be done offline.
Best Regards,
--
Masami HIRAMATSU
Software Platform Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E
removing physical pages of the guest is hard to track and may
involve a TLB flush per page, even if it is done in background.
Thank you,
--
Masami HIRAMATSU
Software Platform Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu...@hitachi.com
options like guest-debugfs mount point, guest's serial
channel pipe (or unix socket?), etc. However, it will be a small
change.
Thank you,
--
Masami HIRAMATSU
Software Platform Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu
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