2021-02-09 20:50:48

by Song Liu

Subject: [PATCH v3] checkpatch: do not apply "initialise globals to 0" check to BPF progs

BPF programs explicitly initialise global variables to 0 to make sure
clang (v10 or older) do not put the variables in the common section.
Skip "initialise globals to 0" check for BPF programs to elimiate error
messages like:

ERROR: do not initialise globals to 0
#19: FILE: samples/bpf/tracex1_kern.c:21:

Cc: Andy Whitcroft <[email protected]>
Cc: Joe Perches <[email protected]>
Signed-off-by: Song Liu <[email protected]>

---
Changes v2 => v3:
1. Fix regex.
Changes v1 => v2:
1. Add function exclude_global_initialisers() to keep the code clean.
---
scripts/checkpatch.pl | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 1afe3af1cc097..967ff2a0b3899 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2428,6 +2428,15 @@ sub get_raw_comment {
return $comment;
}

+sub exclude_global_initialisers {
+ my ($realfile) = @_;
+
+ # Do not check for BPF programs (tools/testing/selftests/bpf/progs/*.c, samples/bpf/*_kern.c, *.bpf.c).
+ return $realfile =~ m@/^tools\/testing\/selftests\/bpf\/progs\/.*\.c@ ||
+ $realfile =~ m@^samples\/bpf\/.*_kern.c@ ||
+ $realfile =~ m@/bpf/.*\.bpf\.c$@;
+}
+
sub process {
my $filename = shift;

@@ -4323,7 +4332,8 @@ sub process {
}

# check for global initialisers.
- if ($line =~ /^\+$Type\s*$Ident(?:\s+$Modifier)*\s*=\s*($zero_initializer)\s*;/) {
+ if ($line =~ /^\+$Type\s*$Ident(?:\s+$Modifier)*\s*=\s*($zero_initializer)\s*;/ &&
+ !exclude_global_initialisers($realfile)) {
if (ERROR("GLOBAL_INITIALISERS",
"do not initialise globals to $1\n" . $herecurr) &&
$fix) {
--
2.24.1

2021-02-09 22:42:19

by Song Liu

Subject: Re: [PATCH v3] checkpatch: do not apply "initialise globals to 0" check to BPF progs

> On Feb 9, 2021, at 10:59 AM, Joe Perches <[email protected]> wrote:
>
> On Tue, 2021-02-09 at 10:33 -0800, Song Liu wrote:
>> BPF programs explicitly initialise global variables to 0 to make sure
>> clang (v10 or older) do not put the variables in the common section.
>> Skip "initialise globals to 0" check for BPF programs to elimiate error
>> messages like:
>>
>> ERROR: do not initialise globals to 0
>> #19: FILE: samples/bpf/tracex1_kern.c:21:
>>
>> Cc: Andy Whitcroft <[email protected]>
>> Cc: Joe Perches <[email protected]>
>> Signed-off-by: Song Liu <[email protected]>
>>
>> ---
>> Changes v2 => v3:
>> 1. Fix regex.
>
> Unfortunately, this has broken regexes...
>
>> Changes v1 => v2:
>> 1. Add function exclude_global_initialisers() to keep the code clean.
>> ---
>> scripts/checkpatch.pl | 12 +++++++++++-
>> 1 file changed, 11 insertions(+), 1 deletion(-)
>>
>> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> []
>> @@ -2428,6 +2428,15 @@ sub get_raw_comment {
>> return $comment;
>> }
>>
>> +sub exclude_global_initialisers {
>> + my ($realfile) = @_;
>> +
>> + # Do not check for BPF programs (tools/testing/selftests/bpf/progs/*.c, samples/bpf/*_kern.c, *.bpf.c).
>> + return $realfile =~ m@/^tools\/testing\/selftests\/bpf\/progs\/.*\.c@ ||
>
> You don't need to escape the / when using m@@, and this doesn't work
> given the leading / after @, and it should use a trailing $
>
> return $realfile =~ m@^tools/testing/selftests/bpf/progs/.*\.c$@ ||
>
>> + $realfile =~ m@^samples\/bpf\/.*_kern.c@ ||
>
> This is still missing an escape on the . before c@, and there's no
> trailing $ between c and @
>
> $realfile =~ m@^samples/bpf/.*_kern\.c$@ ||
>
>> + $realfile =~ m@/bpf/.*\.bpf\.c$@;
>
> I believe I showed the correct regexes in my earlier reply.

Just to be sure I got everything correct, does the follow look right?

return $realfile =~ m@^tools/testing/selftests/bpf/progs/.*\.c$@ ||
$realfile =~ m@^samples/bpf/.*_kern\.c$@ ||
$realfile =~ m@/bpf/.*\.bpf\.c$@;

Thanks,
Song

2021-02-10 00:48:00

by Joe Perches

Subject: Re: [PATCH v3] checkpatch: do not apply "initialise globals to 0" check to BPF progs

On Tue, 2021-02-09 at 10:33 -0800, Song Liu wrote:
> BPF programs explicitly initialise global variables to 0 to make sure
> clang (v10 or older) do not put the variables in the common section.
> Skip "initialise globals to 0" check for BPF programs to elimiate error
> messages like:
>
> ????ERROR: do not initialise globals to 0
> ????#19: FILE: samples/bpf/tracex1_kern.c:21:
>
> Cc: Andy Whitcroft <[email protected]>
> Cc: Joe Perches <[email protected]>
> Signed-off-by: Song Liu <[email protected]>
>
> ---
> Changes v2 => v3:
> ??1. Fix regex.

Unfortunately, this has broken regexes...

> Changes v1 => v2:
> ??1. Add function exclude_global_initialisers() to keep the code clean.
> ---
> ?scripts/checkpatch.pl | 12 +++++++++++-
> ?1 file changed, 11 insertions(+), 1 deletion(-)
>
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
[]
> @@ -2428,6 +2428,15 @@ sub get_raw_comment {
> ? return $comment;
> ?}
> ?
> +sub exclude_global_initialisers {
> + my ($realfile) = @_;
> +
> + # Do not check for BPF programs (tools/testing/selftests/bpf/progs/*.c, samples/bpf/*_kern.c, *.bpf.c).
> + return $realfile =~ m@/^tools\/testing\/selftests\/bpf\/progs\/.*\.c@ ||

You don't need to escape the / when using m@@, and this doesn't work
given the leading / after @, and it should use a trailing $

return $realfile =~ m@^tools/testing/selftests/bpf/progs/.*\.c$@ ||

> + $realfile =~ m@^samples\/bpf\/.*_kern.c@ ||

This is still missing an escape on the . before c@, and there's no
trailing $ between c and @

$realfile =~ m@^samples/bpf/.*_kern\.c$@ ||

> + $realfile =~ m@/bpf/.*\.bpf\.c$@;

I believe I showed the correct regexes in my earlier reply.

2021-02-10 01:09:38

by Song Liu

Subject: Re: [PATCH v3] checkpatch: do not apply "initialise globals to 0" check to BPF progs

> On Feb 9, 2021, at 11:57 AM, Joe Perches <[email protected]> wrote:
>
> On Tue, 2021-02-09 at 19:44 +0000, Song Liu wrote:
>>> On Feb 9, 2021, at 10:59 AM, Joe Perches <[email protected]> wrote:
>>> On Tue, 2021-02-09 at 10:33 -0800, Song Liu wrote:
>>>> BPF programs explicitly initialise global variables to 0 to make sure
>>>> clang (v10 or older) do not put the variables in the common section.
>>>> Skip "initialise globals to 0" check for BPF programs to elimiate error
>>>> messages like:
>>>>
>>>> ERROR: do not initialise globals to 0
>>>> #19: FILE: samples/bpf/tracex1_kern.c:21:
> []
>>>> ---
>>>> Changes v2 => v3:
>>>> 1. Fix regex.
>>>
>>> Unfortunately, this has broken regexes...
>>>
>>>> Changes v1 => v2:
>>>> 1. Add function exclude_global_initialisers() to keep the code clean.
>>>> ---
>>>> scripts/checkpatch.pl | 12 +++++++++++-
>>>> 1 file changed, 11 insertions(+), 1 deletion(-)
>>>>
>>>> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
>>> []
>>>> @@ -2428,6 +2428,15 @@ sub get_raw_comment {
>>>> return $comment;
>>>> }
>>>>
>>>> +sub exclude_global_initialisers {
>>>> + my ($realfile) = @_;
>>>> +
>>>> + # Do not check for BPF programs (tools/testing/selftests/bpf/progs/*.c, samples/bpf/*_kern.c, *.bpf.c).
>>>> + return $realfile =~ m@/^tools\/testing\/selftests\/bpf\/progs\/.*\.c@ ||
>>>
>>> You don't need to escape the / when using m@@, and this doesn't work
>>> given the leading / after @, and it should use a trailing $
>>>
>>> return $realfile =~ m@^tools/testing/selftests/bpf/progs/.*\.c$@ ||
>>>
>>>> + $realfile =~ m@^samples\/bpf\/.*_kern.c@ ||
>>>
>>> This is still missing an escape on the . before c@, and there's no
>>> trailing $ between c and @
>>>
>>> $realfile =~ m@^samples/bpf/.*_kern\.c$@ ||
>>>
>>>> + $realfile =~ m@/bpf/.*\.bpf\.c$@;
>>>
>>> I believe I showed the correct regexes in my earlier reply.
>>
>> Just to be sure I got everything correct, does the follow look right?
>>
>> return $realfile =~ m@^tools/testing/selftests/bpf/progs/.*\.c$@ ||
>> $realfile =~ m@^samples/bpf/.*_kern\.c$@ ||
>> $realfile =~ m@/bpf/.*\.bpf\.c$@;
>>
>> Thanks,
>> Song
>
> Looks right, you tell me though, this is the current -next file list
> for what is being suggested:
>
> $ git ls-files | \
> perl -n -e 'print $_ if ($_ =~ m@^tools/testing/selftests/bpf/progs/.*\.c$@ ||
> $_ =~ m@^samples/bpf/.*_kern\.c$@ ||
> $_ =~ m@/bpf/.*\.bpf\.c$@);'

Thanks! This looks great.

Song

[...]

2021-02-10 02:17:05

by Joe Perches

Subject: Re: [PATCH v3] checkpatch: do not apply "initialise globals to 0" check to BPF progs

On Tue, 2021-02-09 at 19:44 +0000, Song Liu wrote:
> > On Feb 9, 2021, at 10:59 AM, Joe Perches <[email protected]> wrote:
> > On Tue, 2021-02-09 at 10:33 -0800, Song Liu wrote:
> > > BPF programs explicitly initialise global variables to 0 to make sure
> > > clang (v10 or older) do not put the variables in the common section.
> > > Skip "initialise globals to 0" check for BPF programs to elimiate error
> > > messages like:
> > >
> > > ????ERROR: do not initialise globals to 0
> > > ????#19: FILE: samples/bpf/tracex1_kern.c:21:
[]
> > > ---
> > > Changes v2 => v3:
> > > ??1. Fix regex.
> >
> > Unfortunately, this has broken regexes...
> >
> > > Changes v1 => v2:
> > > ??1. Add function exclude_global_initialisers() to keep the code clean.
> > > ---
> > > ?scripts/checkpatch.pl | 12 +++++++++++-
> > > ?1 file changed, 11 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> > []
> > > @@ -2428,6 +2428,15 @@ sub get_raw_comment {
> > > ? return $comment;
> > > ?}
> > >
> > > +sub exclude_global_initialisers {
> > > + my ($realfile) = @_;
> > > +
> > > + # Do not check for BPF programs (tools/testing/selftests/bpf/progs/*.c, samples/bpf/*_kern.c, *.bpf.c).
> > > + return $realfile =~ m@/^tools\/testing\/selftests\/bpf\/progs\/.*\.c@ ||
> >
> > You don't need to escape the / when using m@@, and this doesn't work
> > given the leading / after @, and it should use a trailing $
> >
> > return $realfile =~ m@^tools/testing/selftests/bpf/progs/.*\.c$@ ||
> >
> > > + $realfile =~ m@^samples\/bpf\/.*_kern.c@ ||
> >
> > This is still missing an escape on the . before c@, and there's no
> > trailing $ between c and @
> >
> > $realfile =~ m@^samples/bpf/.*_kern\.c$@ ||
> >
> > > + $realfile =~ m@/bpf/.*\.bpf\.c$@;
> >
> > I believe I showed the correct regexes in my earlier reply.
>
> Just to be sure I got everything correct, does the follow look right?
>
> ????????return $realfile =~ m@^tools/testing/selftests/bpf/progs/.*\.c$@ ||
> ????????????????$realfile =~ m@^samples/bpf/.*_kern\.c$@ ||
> ????????????????$realfile =~ m@/bpf/.*\.bpf\.c$@;
>
> Thanks,
> Song

Looks right, you tell me though, this is the current -next file list
for what is being suggested:

$ git ls-files | \
perl -n -e 'print $_ if ($_ =~ m@^tools/testing/selftests/bpf/progs/.*\.c$@ ||
$_ =~ m@^samples/bpf/.*_kern\.c$@ ||
$_ =~ m@/bpf/.*\.bpf\.c$@);'
kernel/bpf/preload/iterators/iterators.bpf.c
samples/bpf/cpustat_kern.c
samples/bpf/hbm_edt_kern.c
samples/bpf/hbm_out_kern.c
samples/bpf/ibumad_kern.c
samples/bpf/lathist_kern.c
samples/bpf/lwt_len_hist_kern.c
samples/bpf/map_perf_test_kern.c
samples/bpf/offwaketime_kern.c
samples/bpf/sampleip_kern.c
samples/bpf/sock_flags_kern.c
samples/bpf/sockex1_kern.c
samples/bpf/sockex2_kern.c
samples/bpf/sockex3_kern.c
samples/bpf/spintest_kern.c
samples/bpf/syscall_tp_kern.c
samples/bpf/task_fd_query_kern.c
samples/bpf/tc_l2_redirect_kern.c
samples/bpf/tcbpf1_kern.c
samples/bpf/tcp_basertt_kern.c
samples/bpf/tcp_bufs_kern.c
samples/bpf/tcp_clamp_kern.c
samples/bpf/tcp_cong_kern.c
samples/bpf/tcp_dumpstats_kern.c
samples/bpf/tcp_iw_kern.c
samples/bpf/tcp_rwnd_kern.c
samples/bpf/tcp_synrto_kern.c
samples/bpf/tcp_tos_reflect_kern.c
samples/bpf/test_cgrp2_tc_kern.c
samples/bpf/test_current_task_under_cgroup_kern.c
samples/bpf/test_map_in_map_kern.c
samples/bpf/test_overhead_kprobe_kern.c
samples/bpf/test_overhead_raw_tp_kern.c
samples/bpf/test_overhead_tp_kern.c
samples/bpf/test_probe_write_user_kern.c
samples/bpf/trace_event_kern.c
samples/bpf/trace_output_kern.c
samples/bpf/tracex1_kern.c
samples/bpf/tracex2_kern.c
samples/bpf/tracex3_kern.c
samples/bpf/tracex4_kern.c
samples/bpf/tracex5_kern.c
samples/bpf/tracex6_kern.c
samples/bpf/tracex7_kern.c
samples/bpf/xdp1_kern.c
samples/bpf/xdp2_kern.c
samples/bpf/xdp2skb_meta_kern.c
samples/bpf/xdp_adjust_tail_kern.c
samples/bpf/xdp_fwd_kern.c
samples/bpf/xdp_monitor_kern.c
samples/bpf/xdp_redirect_cpu_kern.c
samples/bpf/xdp_redirect_kern.c
samples/bpf/xdp_redirect_map_kern.c
samples/bpf/xdp_router_ipv4_kern.c
samples/bpf/xdp_rxq_info_kern.c
samples/bpf/xdp_sample_pkts_kern.c
samples/bpf/xdp_tx_iptunnel_kern.c
samples/bpf/xdpsock_kern.c
tools/bpf/bpftool/skeleton/pid_iter.bpf.c
tools/bpf/bpftool/skeleton/profiler.bpf.c
tools/bpf/runqslower/runqslower.bpf.c
tools/testing/selftests/bpf/progs/atomic_bounds.c
tools/testing/selftests/bpf/progs/atomics.c
tools/testing/selftests/bpf/progs/bind4_prog.c
tools/testing/selftests/bpf/progs/bind6_prog.c
tools/testing/selftests/bpf/progs/bind_perm.c
tools/testing/selftests/bpf/progs/bpf_cubic.c
tools/testing/selftests/bpf/progs/bpf_dctcp.c
tools/testing/selftests/bpf/progs/bpf_flow.c
tools/testing/selftests/bpf/progs/bpf_iter_bpf_array_map.c
tools/testing/selftests/bpf/progs/bpf_iter_bpf_hash_map.c
tools/testing/selftests/bpf/progs/bpf_iter_bpf_map.c
tools/testing/selftests/bpf/progs/bpf_iter_bpf_percpu_array_map.c
tools/testing/selftests/bpf/progs/bpf_iter_bpf_percpu_hash_map.c
tools/testing/selftests/bpf/progs/bpf_iter_bpf_sk_storage_helpers.c
tools/testing/selftests/bpf/progs/bpf_iter_bpf_sk_storage_map.c
tools/testing/selftests/bpf/progs/bpf_iter_ipv6_route.c
tools/testing/selftests/bpf/progs/bpf_iter_netlink.c
tools/testing/selftests/bpf/progs/bpf_iter_sockmap.c
tools/testing/selftests/bpf/progs/bpf_iter_task.c
tools/testing/selftests/bpf/progs/bpf_iter_task_btf.c
tools/testing/selftests/bpf/progs/bpf_iter_task_file.c
tools/testing/selftests/bpf/progs/bpf_iter_task_stack.c
tools/testing/selftests/bpf/progs/bpf_iter_tcp4.c
tools/testing/selftests/bpf/progs/bpf_iter_tcp6.c
tools/testing/selftests/bpf/progs/bpf_iter_test_kern1.c
tools/testing/selftests/bpf/progs/bpf_iter_test_kern2.c
tools/testing/selftests/bpf/progs/bpf_iter_test_kern3.c
tools/testing/selftests/bpf/progs/bpf_iter_test_kern4.c
tools/testing/selftests/bpf/progs/bpf_iter_test_kern5.c
tools/testing/selftests/bpf/progs/bpf_iter_test_kern6.c
tools/testing/selftests/bpf/progs/bpf_iter_udp4.c
tools/testing/selftests/bpf/progs/bpf_iter_udp6.c
tools/testing/selftests/bpf/progs/bprm_opts.c
tools/testing/selftests/bpf/progs/btf__core_reloc_arrays.c
tools/testing/selftests/bpf/progs/btf__core_reloc_arrays___diff_arr_dim.c
tools/testing/selftests/bpf/progs/btf__core_reloc_arrays___diff_arr_val_sz.c
tools/testing/selftests/bpf/progs/btf__core_reloc_arrays___equiv_zero_sz_arr.c
tools/testing/selftests/bpf/progs/btf__core_reloc_arrays___err_bad_zero_sz_arr.c
tools/testing/selftests/bpf/progs/btf__core_reloc_arrays___err_non_array.c
tools/testing/selftests/bpf/progs/btf__core_reloc_arrays___err_too_shallow.c
tools/testing/selftests/bpf/progs/btf__core_reloc_arrays___err_too_small.c
tools/testing/selftests/bpf/progs/btf__core_reloc_arrays___err_wrong_val_type.c
tools/testing/selftests/bpf/progs/btf__core_reloc_arrays___fixed_arr.c
tools/testing/selftests/bpf/progs/btf__core_reloc_bitfields.c
tools/testing/selftests/bpf/progs/btf__core_reloc_bitfields___bit_sz_change.c
tools/testing/selftests/bpf/progs/btf__core_reloc_bitfields___bitfield_vs_int.c
tools/testing/selftests/bpf/progs/btf__core_reloc_bitfields___err_too_big_bitfield.c
tools/testing/selftests/bpf/progs/btf__core_reloc_bitfields___just_big_enough.c
tools/testing/selftests/bpf/progs/btf__core_reloc_enumval.c
tools/testing/selftests/bpf/progs/btf__core_reloc_enumval___diff.c
tools/testing/selftests/bpf/progs/btf__core_reloc_enumval___err_missing.c
tools/testing/selftests/bpf/progs/btf__core_reloc_enumval___val3_missing.c
tools/testing/selftests/bpf/progs/btf__core_reloc_existence.c
tools/testing/selftests/bpf/progs/btf__core_reloc_existence___err_wrong_arr_kind.c
tools/testing/selftests/bpf/progs/btf__core_reloc_existence___err_wrong_arr_value_type.c
tools/testing/selftests/bpf/progs/btf__core_reloc_existence___err_wrong_int_kind.c
tools/testing/selftests/bpf/progs/btf__core_reloc_existence___err_wrong_int_sz.c
tools/testing/selftests/bpf/progs/btf__core_reloc_existence___err_wrong_int_type.c
tools/testing/selftests/bpf/progs/btf__core_reloc_existence___err_wrong_struct_type.c
tools/testing/selftests/bpf/progs/btf__core_reloc_existence___minimal.c
tools/testing/selftests/bpf/progs/btf__core_reloc_flavors.c
tools/testing/selftests/bpf/progs/btf__core_reloc_flavors__err_wrong_name.c
tools/testing/selftests/bpf/progs/btf__core_reloc_ints.c
tools/testing/selftests/bpf/progs/btf__core_reloc_ints___bool.c
tools/testing/selftests/bpf/progs/btf__core_reloc_ints___reverse_sign.c
tools/testing/selftests/bpf/progs/btf__core_reloc_misc.c
tools/testing/selftests/bpf/progs/btf__core_reloc_mods.c
tools/testing/selftests/bpf/progs/btf__core_reloc_mods___mod_swap.c
tools/testing/selftests/bpf/progs/btf__core_reloc_mods___typedefs.c
tools/testing/selftests/bpf/progs/btf__core_reloc_nesting.c
tools/testing/selftests/bpf/progs/btf__core_reloc_nesting___anon_embed.c
tools/testing/selftests/bpf/progs/btf__core_reloc_nesting___dup_compat_types.c
tools/testing/selftests/bpf/progs/btf__core_reloc_nesting___err_array_container.c
tools/testing/selftests/bpf/progs/btf__core_reloc_nesting___err_array_field.c
tools/testing/selftests/bpf/progs/btf__core_reloc_nesting___err_dup_incompat_types.c
tools/testing/selftests/bpf/progs/btf__core_reloc_nesting___err_missing_container.c
tools/testing/selftests/bpf/progs/btf__core_reloc_nesting___err_missing_field.c
tools/testing/selftests/bpf/progs/btf__core_reloc_nesting___err_nonstruct_container.c
tools/testing/selftests/bpf/progs/btf__core_reloc_nesting___err_partial_match_dups.c
tools/testing/selftests/bpf/progs/btf__core_reloc_nesting___err_too_deep.c
tools/testing/selftests/bpf/progs/btf__core_reloc_nesting___extra_nesting.c
tools/testing/selftests/bpf/progs/btf__core_reloc_nesting___struct_union_mixup.c
tools/testing/selftests/bpf/progs/btf__core_reloc_primitives.c
tools/testing/selftests/bpf/progs/btf__core_reloc_primitives___diff_enum_def.c
tools/testing/selftests/bpf/progs/btf__core_reloc_primitives___diff_func_proto.c
tools/testing/selftests/bpf/progs/btf__core_reloc_primitives___diff_ptr_type.c
tools/testing/selftests/bpf/progs/btf__core_reloc_primitives___err_non_enum.c
tools/testing/selftests/bpf/progs/btf__core_reloc_primitives___err_non_int.c
tools/testing/selftests/bpf/progs/btf__core_reloc_primitives___err_non_ptr.c
tools/testing/selftests/bpf/progs/btf__core_reloc_ptr_as_arr.c
tools/testing/selftests/bpf/progs/btf__core_reloc_ptr_as_arr___diff_sz.c
tools/testing/selftests/bpf/progs/btf__core_reloc_size.c
tools/testing/selftests/bpf/progs/btf__core_reloc_size___diff_sz.c
tools/testing/selftests/bpf/progs/btf__core_reloc_size___err_ambiguous.c
tools/testing/selftests/bpf/progs/btf__core_reloc_type_based.c
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$