On 7/17/24 11:43 PM, Masami Hiramatsu (Google) wrote:
On Wed, 17 Jul 2024 13:58:35 +1000
Michael Ellerman wrote:
Masami Hiramatsu (Google) writes:
On Sun, 14 Jul 2024 14:04:23 +0530
Naveen N Rao wrote:
I have switched to using my @kernel.org id for my contributions. Update
MAINTAINERS and
On 10/13/23 7:31 AM, Muhammad Muzammil wrote:
Fixed 'instead' typo
Signed-off-by: Muhammad Muzammil
Michael, I presume you'll pick it up?
Thanks,
Daniel
---
arch/powerpc/net/bpf_jit_comp32.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/powerpc/net/bpf_jit_com
On 10/12/23 10:03 PM, Hari Bathini wrote:
Most BPF programs are small, but they consume a page each. For systems
with busy traffic and many BPF programs, this may also add significant
pressure on instruction TLB. High iTLB pressure usually slows down the
whole system causing visible performance d
then image/insn is valid. BTW, we can use the "bpftool prog dump" JITed
instructions.
* clean up the doc
* remove bpf_jit_disasm tool
* set bpf_jit_enable only 0 or 1.
Signed-off-by: Tonghao Zhang
Suggested-by: Alexei Starovoitov
Cc: Alexei Starovoitov
Cc: Daniel Borkmann
Cc: Andr
On 5/12/22 9:45 AM, Hari Bathini wrote:
This patchset adds atomic operations to the eBPF instruction set on
powerpc. The instructions that are added here can be summarised with
this list of kernel operations for ppc64:
* atomic[64]_[fetch_]add
* atomic[64]_[fetch_]and
* atomic[64]_[fetch_]or
* a
.
Fixes: fa28dcb82a38f8 ("bpf: Introduce helper bpf_get_task_stack()")
Cc: sta...@vger.kernel.org # v5.9+
Signed-off-by: Naveen N. Rao
Acked-by: Daniel Borkmann
On 10/25/21 8:15 AM, Naveen N. Rao wrote:
Hari Bathini wrote:
Running program with bpf-to-bpf function calls results in data access
exception (0x300) with the below call trace:
[c0113f28] bpf_int_jit_compile+0x238/0x750 (unreliable)
[c037d2f8] bpf_check+0x2008/0x2710
On 10/4/21 12:49 AM, Michael Ellerman wrote:
Daniel Borkmann writes:
On 9/29/21 1:18 PM, Hari Bathini wrote:
Patch #1 & #2 are simple cleanup patches. Patch #3 refactors JIT
compiler code with the aim to simplify adding BPF_PROBE_MEM support.
Patch #4 introduces PPC_RAW_BRANCH() macro ins
On 9/29/21 1:18 PM, Hari Bathini wrote:
Patch #1 & #2 are simple cleanup patches. Patch #3 refactors JIT
compiler code with the aim to simplify adding BPF_PROBE_MEM support.
Patch #4 introduces PPC_RAW_BRANCH() macro instead of open coding
branch instruction. Patch #5 & #7 add BPF_PROBE_MEM suppo
On 9/11/21 3:56 AM, Tiezhu Yang wrote:
In the current code, the actual max tail call count is 33 which is greater
than MAX_TAIL_CALL_CNT (defined as 32), the actual limit is not consistent
with the meaning of MAX_TAIL_CALL_CNT, there is some confusion and need to
spend some time to think about th
On 9/9/21 7:50 AM, Andrii Nakryiko wrote:
On Wed, Sep 8, 2021 at 8:33 PM Tiezhu Yang wrote:
In the current code, the actual max tail call count is 33 which is greater
than MAX_TAIL_CALL_CNT (defined as 32), the actual limit is not consistent
with the meaning of MAX_TAIL_CALL_CNT, there is some
On 6/4/21 6:50 AM, Paul Moore wrote:
On Thu, Jun 3, 2021 at 2:53 PM Daniel Borkmann wrote:
[...]
I did run this entire discussion by both of the other BPF co-maintainers
(Alexei, Andrii, CC'ed) and together we did further brainstorming on the
matter on how we could solve this, but cou
_trace_sched_switch+0x142/0x180
[ 730.891485] ? __schedule+0x6d8/0xb20
[ 730.892209] __schedule+0x6d8/0xb20
[ 730.892899] schedule+0x5b/0xc0
[ 730.893522] exit_to_user_mode_prepare+0x11d/0x240
[ 730.894457] syscall_exit_to_user_mode+0x27/0x70
[ 730.895361] entry_SYSCALL_64_after_hwframe+0x44/0xae
[
On 6/1/21 10:47 PM, Paul Moore wrote:
On Mon, May 31, 2021 at 4:24 AM Daniel Borkmann wrote:
On 5/29/21 8:48 PM, Paul Moore wrote:
[...]
Daniel's patch side steps that worry by just doing the lockdown
permission check when the BPF program is loaded, but that isn't a
great solut
On 5/29/21 8:48 PM, Paul Moore wrote:
[...]
Daniel's patch side steps that worry by just doing the lockdown
permission check when the BPF program is loaded, but that isn't a
great solution if the policy changes afterward. I was hoping there
might be some way to perform the permission check as ne
On 5/28/21 5:47 PM, Paul Moore wrote:
On Fri, May 28, 2021 at 3:10 AM Daniel Borkmann wrote:
On 5/28/21 3:37 AM, Paul Moore wrote:
On Mon, May 17, 2021 at 5:22 AM Ondrej Mosnacek wrote:
Commit 59438b46471a ("security,lockdown,selinux: implement SELinux
lockdown") added an impleme
On 5/28/21 3:42 PM, Ondrej Mosnacek wrote:
(I'm off work today and plan to reply also to Paul's comments next
week, but for now let me at least share a couple quick thoughts on
Daniel's patch.)
On Fri, May 28, 2021 at 11:56 AM Daniel Borkmann wrote:
On 5/28/21 9:09 AM, Daniel
On 5/28/21 1:47 PM, Jiri Olsa wrote:
On Fri, May 28, 2021 at 11:56:02AM +0200, Daniel Borkmann wrote:
Ondrej / Paul / Jiri: at least for the BPF tracing case specifically (I haven't
looked
at the rest but it's also kind of independent), the attached fix should address
both
repor
On 5/28/21 9:09 AM, Daniel Borkmann wrote:
On 5/28/21 3:37 AM, Paul Moore wrote:
On Mon, May 17, 2021 at 5:22 AM Ondrej Mosnacek wrote:
Commit 59438b46471a ("security,lockdown,selinux: implement SELinux
lockdown") added an implementation of the locked_down LSM hook to
SELinux, wi
On 5/28/21 3:37 AM, Paul Moore wrote:
On Mon, May 17, 2021 at 5:22 AM Ondrej Mosnacek wrote:
Commit 59438b46471a ("security,lockdown,selinux: implement SELinux
lockdown") added an implementation of the locked_down LSM hook to
SELinux, with the aim to restrict which domains are allowed to perfo
On 4/15/21 11:32 AM, Jianlin Lv wrote:
For debugging JITs, dumping the JITed image to kernel log is discouraged,
"bpftool prog dump jited" is much better way to examine JITed dumps.
This patch get rid of the code related to bpf_jit_enable=2 mode and
update the proc handler of bpf_jit_enable, also
On 9/28/20 11:00 AM, zhe...@windriver.com wrote:
From: He Zhe
The user defined label following "fallthrough" is not considered by GCC
and causes build failure.
kernel-source/include/linux/compiler_attributes.h:208:41: error: attribute
'fallthrough' not preceding a case label or default label [
On 5/28/20 2:23 PM, Michael Ellerman wrote:
Petr Mladek writes:
On Thu 2020-05-28 11:03:43, Michael Ellerman wrote:
Petr Mladek writes:
The commit 0ebeea8ca8a4d1d453a ("bpf: Restrict bpf_probe_read{, str}() only
to archs where they work") caused that bpf_probe_read{, str}() functions
were no
Hey Nicholas,
On 4/7/20 6:01 AM, Nicholas Piggin wrote:
Nicholas Piggin's on April 3, 2020 9:05 pm:
Christophe Leroy's on April 3, 2020 8:31 pm:
Le 03/04/2020 à 11:35, Nicholas Piggin a écrit :
There is no need to allow user accesses when probing kernel addresses.
I just discovered the foll
On Mon, Dec 02, 2019 at 04:53:26PM +1100, Michael Ellerman wrote:
> Aurelien Jarno writes:
> > On powerpc with recent versions of binutils, readelf outputs an extra
> > field when dumping the symbols of an object file. For example:
> >
> > 35: 083896 FUNCLOCAL DEFAULT [: 8
On 8/21/19 9:23 PM, Naveen N. Rao wrote:
Since BPF constant blinding is performed after the verifier pass, the
ALU32 instructions inserted for doubleword immediate loads don't have a
corresponding zext instruction. This is causing a kernel oops on powerpc
and can be reproduced by running 'test_cg
On 06/12/2019 08:51 PM, Naveen N. Rao wrote:
> The first patch updates DIV64 overflow tests to properly detect error
> conditions. The second patch fixes powerpc64 JIT to generate the proper
> unsigned division instruction for BPF_ALU64.
>
> - Naveen
>
> Naveen N. Rao (2):
> bpf: fix div64 ov
On 03/15/2019 03:51 PM, Naveen N. Rao wrote:
> Yauheni Kaliuta pointed out that PTR_TO_STACK store/load verifier test
> was failing on powerpc64 BE, and rightfully indicated that the PPC_LD()
> macro is not masking away the last two bits of the offset per the ISA,
> resulting in the generation of '
On 12/10/2018 06:27 PM, Michael Roth wrote:
> Quoting Daniel Borkmann (2018-12-10 08:26:31)
>> On 12/07/2018 04:36 PM, Michael Roth wrote:
>>> Quoting Michael Ellerman (2018-12-07 06:31:13)
>>>> Michael Roth writes:
>>>>
>>>>> Commit ed
needed to add BPF_MIN(), I assume because the
>> kernel version of min() has gotten too complicated to work here?
>
> I wasn't sure if it was safe here or not, so I tried looking at other
> users and came across:
>
> mm/vmalloc.c:777:#define VMAP_MIN(x, y)
On 12/03/2018 02:26 PM, Sandipan Das wrote:
> Hi Daniel,
>
> On 03/12/18 6:18 PM, Daniel Borkmann wrote:
>>
>> Thanks for the patch, just to clarify, it's targeted at bpf-next and
>> not bpf, correct?
>
> This patch is targeted at the bpf tree.
Ok, thanks for clarifying, applied to bpf!
Hi Sandipan,
On 12/03/2018 01:21 PM, Sandipan Das wrote:
> Once the JITed images for each function in a multi-function program
> are generated after the first three JIT passes, we only need to fix
> the target address for the branch instruction corresponding to each
> bpf-to-bpf function call.
>
On 11/10/2018 07:58 PM, Michał Mirosław wrote:
> Signed-off-by: Michał Mirosław
Why you have empty commit messages for non-trivial changes like this in
4 out of 6 of your patches ...
How was it tested on the JITs you were changing? Did you test on both,
big and little endian machines?
> ---
>
On 11/10/2018 10:47 PM, David Miller wrote:
> From: Michał Mirosław
> Date: Sat, 10 Nov 2018 19:58:29 +0100
>
>> Fix BPF code/JITs to allow for separate VLAN_PRESENT flag
>> storage and finally move the flag to separate storage in skbuff.
>>
>> This is final step to make CLAN.CFI transparent to c
On 11/17/2018 07:57 PM, Ard Biesheuvel wrote:
> Commit ede95a63b5e84 ("bpf: add bpf_jit_limit knob to restrict unpriv
> allocations") added a call to bpf_jit_uncharge_modmem() to the routine
> bpf_jit_binary_free() which is called from the __weak bpf_jit_free().
> This function is overridden by arc
On 05/24/2018 10:25 AM, Sandipan Das wrote:
> On 05/24/2018 01:04 PM, Daniel Borkmann wrote:
>> On 05/24/2018 08:56 AM, Sandipan Das wrote:
>>> For multi-function programs, loading the address of a callee
>>> function to a register requires emitting instructions whose
&
On 05/24/2018 08:56 AM, Sandipan Das wrote:
> For multi-function programs, loading the address of a callee
> function to a register requires emitting instructions whose
> count varies from one to five depending on the nature of the
> address.
>
> Since we come to know of the callee's address only
On 05/24/2018 08:56 AM, Sandipan Das wrote:
> [1] Support for bpf-to-bpf function calls in the powerpc64 JIT compiler.
>
> [2] Provide a way for resolving function calls because of the way JITed
> images are allocated in powerpc64.
>
> [3] Fix to get JITed instruction dumps for multi-function
On 05/23/2018 12:37 PM, Sandipan Das wrote:
[...]
> Other than that, for powerpc64, there is a problem with the way the
> binutils disassembler code (in "opcodes/ppc-dis.c") passes arguments
> to the callback fprintf_json().
>
> In fprintf_json(), we always expect the va_list elements to resolve
>
On 05/22/2018 09:55 PM, Jakub Kicinski wrote:
> On Tue, 22 May 2018 22:46:13 +0530, Sandipan Das wrote:
>> +if (info.nr_jited_func_lens && info.jited_func_lens) {
>> +struct kernel_sym *sym = NULL;
>> +unsigned char *img = buf;
>> +
On 05/21/2018 09:42 PM, Sandipan Das wrote:
> On 05/18/2018 09:21 PM, Daniel Borkmann wrote:
>> On 05/18/2018 02:50 PM, Sandipan Das wrote:
>>> Currently, for multi-function programs, we cannot get the JITed
>>> instructions using the bpf system call's BPF_OBJ_GET
On 05/18/2018 06:05 PM, Naveen N. Rao wrote:
> Daniel Borkmann wrote:
>> On 05/18/2018 02:50 PM, Sandipan Das wrote:
>>> This adds support for bpf-to-bpf function calls in the powerpc64
>>> JIT compiler. The JIT compiler converts the bpf call instructions
>>> to
On 05/18/2018 02:50 PM, Sandipan Das wrote:
> Currently, for multi-function programs, we cannot get the JITed
> instructions using the bpf system call's BPF_OBJ_GET_INFO_BY_FD
> command. Because of this, userspace tools such as bpftool fail
> to identify a multi-function program as being JITed or n
f a call
> instruction in the verifier instead of the offset of
> the callee's symbol's address from __bpf_call_base.
>
> [2] Determining the address of a callee's corresponding
> symbol by using the imm field as an index for the
> list of kernel symb
On 05/18/2018 02:50 PM, Sandipan Das wrote:
> The imm field of a bpf instruction is a signed 32-bit integer.
> For JIT bpf-to-bpf function calls, it stores the offset of the
> start address of the callee's JITed image from __bpf_call_base.
>
> For some architectures, such as powerpc64, this offset
On 05/18/2018 02:50 PM, Sandipan Das wrote:
> This adds support for bpf-to-bpf function calls in the powerpc64
> JIT compiler. The JIT compiler converts the bpf call instructions
> to native branch instructions. After a round of the usual passes,
> the start addresses of the JITed images for the ca
consider?
>
> Since each subprog does not get a separate id, we cannot fetch
> the fd and therefore the tag of a subprog. Instead we can use
> the tag of the complete program as shown below.
>
> "Daniel Borkmann" wrote:
>> I think one limitation that would s
On 02/21/2018 01:33 AM, Michael Ellerman wrote:
> Mark Lord writes:
>
>> I am using SECCOMP to filter syscalls on a ppc32 platform,
>> and noticed that the JIT compiler was failing on the BPF
>> even though the interpreter was working fine.
>>
>> The issue was that the compiler was missing one of
On 02/15/2018 05:25 PM, Daniel Borkmann wrote:
> On 02/13/2018 05:05 AM, Sandipan Das wrote:
>> The imm field of a bpf_insn is a signed 32-bit integer. For
>> JIT-ed bpf-to-bpf function calls, it stores the offset from
>> __bpf_call_base to the start of the callee fun
On 02/13/2018 05:05 AM, Sandipan Das wrote:
> The imm field of a bpf_insn is a signed 32-bit integer. For
> JIT-ed bpf-to-bpf function calls, it stores the offset from
> __bpf_call_base to the start of the callee function.
>
> For some architectures, such as powerpc64, it was found that
> this off
On 09/01/2017 08:53 PM, Sandipan Das wrote:
Take advantage of stack_depth tracking, originally introduced for
x64, in powerpc JIT as well. Round up allocated stack by 16 bytes
to make sure it stays aligned for functions called from JITed bpf
program.
Signed-off-by: Sandipan Das
Awesome, thank
. Rao
Acked-by: Daniel Borkmann
On 09/26/2016 10:56 AM, Naveen N. Rao wrote:
On 2016/09/24 03:30AM, Alexei Starovoitov wrote:
On Sat, Sep 24, 2016 at 12:33:54AM +0200, Daniel Borkmann wrote:
On 09/23/2016 10:35 PM, Naveen N. Rao wrote:
Tail calls allow JIT'ed eBPF programs to call into other JIT'ed eBPF
programs
On 09/23/2016 10:35 PM, Naveen N. Rao wrote:
Tail calls allow JIT'ed eBPF programs to call into other JIT'ed eBPF
programs. This can be achieved either by:
(1) retaining the stack setup by the first eBPF program and having all
subsequent eBPF programs re-using it, or,
(2) by unwinding/tearing dow
On 09/23/2016 10:35 PM, Naveen N. Rao wrote:
In line with similar support for other architectures by Daniel Borkmann.
'MOD Default X' from test_bpf without constant blinding:
84 bytes emitted from JIT compiler (pass:3, flen:7)
d58a4688 + :
0: nop
4: nop
8: std
: Alexei Starovoitov
Cc: Daniel Borkmann
Cc: "David S. Miller"
Cc: Ananth N Mavinakayanahalli
Cc: Michael Ellerman
Cc: Paul Mackerras
Signed-off-by: Naveen N. Rao
Thanks for adding these!
Acked-by: Daniel Borkmann
___
Linuxppc-dev ma
On 04/05/2016 12:02 PM, Naveen N. Rao wrote:
BPF_ALU32 and BPF_ALU64 tests for adding two 32-bit values that results in
32-bit overflow.
Cc: Alexei Starovoitov
Cc: Daniel Borkmann
Cc: "David S. Miller"
Cc: Ananth N Mavinakayanahalli
Cc: Michael Ellerman
Cc: Paul Mackerras
Sig
On 04/05/2016 12:02 PM, Naveen N. Rao wrote:
Unsigned Jump-if-Greater-Than.
Cc: Alexei Starovoitov
Cc: Daniel Borkmann
Cc: "David S. Miller"
Cc: Ananth N Mavinakayanahalli
Cc: Michael Ellerman
Cc: Paul Mackerras
Signed-off-by: Naveen N. Rao
Acked-by: Danie
On 04/05/2016 12:02 PM, Naveen N. Rao wrote:
JMP_JSET tests incorrectly used BPF_JNE. Fix the same.
Cc: Alexei Starovoitov
Cc: Daniel Borkmann
Cc: "David S. Miller"
Cc: Ananth N Mavinakayanahalli
Cc: Michael Ellerman
Cc: Paul Mackerras
Signed-off-by: Naveen N. Rao
Acked-
On 04/01/2016 08:10 PM, Alexei Starovoitov wrote:
On 4/1/16 2:58 AM, Naveen N. Rao wrote:
PPC64 eBPF JIT compiler. Works for both ABIv1 and ABIv2.
Enable with:
echo 1 > /proc/sys/net/core/bpf_jit_enable
or
echo 2 > /proc/sys/net/core/bpf_jit_enable
... to see the generated JIT code. This can f
On 03/31/2016 07:46 PM, Alexei Starovoitov wrote:
On 3/31/16 4:25 AM, Naveen N. Rao wrote:
While at it, fix some typos in the comment.
Cc: Alexei Starovoitov
Cc: David S. Miller
Cc: Ananth N Mavinakayanahalli
Cc: Michael Ellerman
Signed-off-by: Naveen N. Rao
---
samples/bpf/Makefile | 11
-by: Rabin Vincent
Excellent catch, thanks a lot! The fix looks good to me and should
go to -net tree.
Acked-by: Daniel Borkmann
If you're interested, feel free to add a small test case for the
SKF_AD_ALU_XOR_X issue to lib/test_bpf.c for -net-ne
On 01/05/2016 05:03 PM, Rabin Vincent wrote:
On Tue, Jan 05, 2016 at 08:00:45AM -0800, Eric Dumazet wrote:
On Tue, 2016-01-05 at 16:23 +0100, Rabin Vincent wrote:
The SKF_AD_ALU_XOR_X ancillary is not like the other ancillary data
instructions since it XORs A with X while all the others replace
On 02/16/2015 08:13 AM, Denis Kirjanov wrote:
...
Well, I don't see significant challenges to enable eBPF on ppc64 in the future.
I'll start working on it after I get this merged
Cool, awesome!
___
Linuxppc-dev mailing list
Linuxppc-dev@lists.ozlabs.o
On 02/15/2015 07:06 PM, Denis Kirjanov wrote:
This patch series enables BPF JIT on ppc32. There are relatevily
few chnages in the code to make it work.
All test_bpf tests passed both on 7447a and P2041-based machines.
I'm just wondering, next to the feedback that has already been
provided, wou
: Daniel Borkmann [mailto:dbork...@redhat.com]
Sent: Thursday, December 04, 2014 5:42 AM
To: Yokoyama, Caz
Cc: b...@kernel.crashing.org; linuxppc-dev@lists.ozlabs.org
Subject: ppc64 and Documentation/mic/mpssd/mpssd.c issues
Hi Caz,
I think commit ...
commit 8d49751580db804a02caf6a5b7cebe2ff26c0d7e
Hi Caz,
I think commit ...
commit 8d49751580db804a02caf6a5b7cebe2ff26c0d7e
Author: Caz Yokoyama
Date: Thu Sep 5 16:42:39 2013 -0700
Sample Implementation of Intel MIC User Space Daemon.
... actually triggers a build error on my default config
ppc64 (I'm using net-next tree):
HOSTCC
On 10/31/2014 07:09 AM, Denis Kirjanov wrote:
On 10/30/14, Alexei Starovoitov wrote:
On Wed, Oct 29, 2014 at 11:12 PM, Denis Kirjanov
wrote:
Add BPF extension SKF_AD_PKTTYPE to ppc JIT to load
skb->pkt_type field.
Before:
[ 88.262622] test_bpf: #11 LD_IND_NET 86 97 99 PASS
[ 88.265740] t
On 11/01/2014 07:00 PM, David Miller wrote:
From: Denis Kirjanov
Date: Sat, 1 Nov 2014 21:49:27 +0400
David, you need a feedback from other guys to apply this patch, right?
Alexei wanted some output before/after the patch.
Michael Ellerman wanted the explanation what a BPF_ANC | SKF_AD_PKTTYP
On 06/27/2014 07:08 AM, Michael Ellerman wrote:
On Thu, 2014-06-26 at 10:36 +0200, Daniel Borkmann wrote:
On 06/26/2014 10:30 AM, Michael Ellerman wrote:
On Wed, 2014-06-25 at 21:34 +0400, Denis Kirjanov wrote:
We have to return the boolean here if the tag presents
or not, not just ANDing the
On 06/26/2014 10:30 AM, Michael Ellerman wrote:
On Wed, 2014-06-25 at 21:34 +0400, Denis Kirjanov wrote:
We have to return the boolean here if the tag presents
or not, not just ANDing the TCI with the mask which results to:
[ 709.412097] test_bpf: #18 LD_VLAN_TAG_PRESENT
[ 709.412245] ret 409
On 09/03/2013 10:52 PM, Daniel Borkmann wrote:
On 09/03/2013 09:58 PM, Vladimir Murzin wrote:
[...]
Do you have a test case/suite by any chance ?
Ben.
Hi Ben!
Thanks for your feedback.
This patch is only compile tested. I have no real hardware, but I'll
probably bring up qemu ppc64
On 09/03/2013 09:58 PM, Vladimir Murzin wrote:
On Tue, Sep 03, 2013 at 06:45:50AM +1000, Benjamin Herrenschmidt wrote:
On Mon, 2013-09-02 at 19:48 +0200, Vladimir Murzin wrote:
Ping
On Wed, Aug 28, 2013 at 02:49:52AM +0400, Vladimir Murzin wrote:
commit b6069a9570 (filter: add MOD operation)
.
Cc: Benjamin Herrenschmidt
Signed-off-by: Daniel Borkmann
---
Note: compile-tested only!
arch/powerpc/kernel/smp.c |2 +-
arch/powerpc/sysdev/xics/ics-rtas.c |2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
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