* [PATCH] selftests: kvm: remove reassignment of non-absolute variables
@ 2020-12-10 4:36 Bill Wendling
2020-12-11 0:50 ` Sean Christopherson
0 siblings, 1 reply; 10+ messages in thread
From: Bill Wendling @ 2020-12-10 4:36 UTC (permalink / raw)
To: Paolo Bonzini, linux-kselftest, kvm
Cc: Benjamin Herrenschmidt, Shuah Khan, Bill Wendling, Jian Cai
Clang's integrated assembler does not allow symbols with non-absolute
values to be reassigned. Modify the interrupt entry loop macro to be
compatible with IAS by using a label and an offset.
Cc: Jian Cai <caij2003@gmail.com>
Signed-off-by: Bill Wendling <morbo@google.com>
References: https://lore.kernel.org/lkml/20200714233024.1789985-1-caij2003@gmail.com/
---
tools/testing/selftests/kvm/lib/x86_64/handlers.S | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/tools/testing/selftests/kvm/lib/x86_64/handlers.S b/tools/testing/selftests/kvm/lib/x86_64/handlers.S
index aaf7bc7d2ce1..3f9181e9a0a7 100644
--- a/tools/testing/selftests/kvm/lib/x86_64/handlers.S
+++ b/tools/testing/selftests/kvm/lib/x86_64/handlers.S
@@ -54,9 +54,9 @@ idt_handlers:
.align 8
/* Fetch current address and append it to idt_handlers. */
- current_handler = .
+0 :
.pushsection .rodata
-.quad current_handler
+ .quad 0b
.popsection
.if ! \has_error
--
2.29.2.576.ga3fc446d84-goog
^ permalink raw reply related [flat|nested] 10+ messages in thread
* Re: [PATCH] selftests: kvm: remove reassignment of non-absolute variables
2020-12-10 4:36 [PATCH] selftests: kvm: remove reassignment of non-absolute variables Bill Wendling
@ 2020-12-11 0:50 ` Sean Christopherson
2020-12-11 1:04 ` Bill Wendling
0 siblings, 1 reply; 10+ messages in thread
From: Sean Christopherson @ 2020-12-11 0:50 UTC (permalink / raw)
To: Bill Wendling
Cc: Paolo Bonzini, linux-kselftest, kvm, Benjamin Herrenschmidt,
Shuah Khan, Jian Cai
On Wed, Dec 09, 2020, Bill Wendling wrote:
> Clang's integrated assembler does not allow symbols with non-absolute
> values to be reassigned. Modify the interrupt entry loop macro to be
> compatible with IAS by using a label and an offset.
>
> Cc: Jian Cai <caij2003@gmail.com>
> Signed-off-by: Bill Wendling <morbo@google.com>
> References: https://lore.kernel.org/lkml/20200714233024.1789985-1-caij2003@gmail.com/
> ---
> tools/testing/selftests/kvm/lib/x86_64/handlers.S | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/tools/testing/selftests/kvm/lib/x86_64/handlers.S b/tools/testing/selftests/kvm/lib/x86_64/handlers.S
> index aaf7bc7d2ce1..3f9181e9a0a7 100644
> --- a/tools/testing/selftests/kvm/lib/x86_64/handlers.S
> +++ b/tools/testing/selftests/kvm/lib/x86_64/handlers.S
> @@ -54,9 +54,9 @@ idt_handlers:
> .align 8
>
> /* Fetch current address and append it to idt_handlers. */
> - current_handler = .
> +0 :
> .pushsection .rodata
> -.quad current_handler
> + .quad 0b
Bit of a silly nit: can we use a named label, or at least a non-zero shorthand?
It's really easy to misread "0b" as zeroing out the value, at least for me.
> .popsection
>
> .if ! \has_error
> --
> 2.29.2.576.ga3fc446d84-goog
>
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH] selftests: kvm: remove reassignment of non-absolute variables
2020-12-11 0:50 ` Sean Christopherson
@ 2020-12-11 1:04 ` Bill Wendling
2020-12-11 1:07 ` Sean Christopherson
2020-12-11 1:36 ` [PATCH] " Jim Mattson
0 siblings, 2 replies; 10+ messages in thread
From: Bill Wendling @ 2020-12-11 1:04 UTC (permalink / raw)
To: Sean Christopherson
Cc: Paolo Bonzini, linux-kselftest, kvm list, Benjamin Herrenschmidt,
Shuah Khan, Jian Cai
On Thu, Dec 10, 2020 at 4:50 PM Sean Christopherson <seanjc@google.com> wrote:
>
> On Wed, Dec 09, 2020, Bill Wendling wrote:
> > Clang's integrated assembler does not allow symbols with non-absolute
> > values to be reassigned. Modify the interrupt entry loop macro to be
> > compatible with IAS by using a label and an offset.
> >
> > Cc: Jian Cai <caij2003@gmail.com>
> > Signed-off-by: Bill Wendling <morbo@google.com>
> > References: https://lore.kernel.org/lkml/20200714233024.1789985-1-caij2003@gmail.com/
> > ---
> > tools/testing/selftests/kvm/lib/x86_64/handlers.S | 4 ++--
> > 1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/tools/testing/selftests/kvm/lib/x86_64/handlers.S b/tools/testing/selftests/kvm/lib/x86_64/handlers.S
> > index aaf7bc7d2ce1..3f9181e9a0a7 100644
> > --- a/tools/testing/selftests/kvm/lib/x86_64/handlers.S
> > +++ b/tools/testing/selftests/kvm/lib/x86_64/handlers.S
> > @@ -54,9 +54,9 @@ idt_handlers:
> > .align 8
> >
> > /* Fetch current address and append it to idt_handlers. */
> > - current_handler = .
> > +0 :
> > .pushsection .rodata
> > -.quad current_handler
> > + .quad 0b
>
> Bit of a silly nit: can we use a named label, or at least a non-zero shorthand?
> It's really easy to misread "0b" as zeroing out the value, at least for me.
>
I don't believe that will work. If I rename "0 :" to something more
concrete, like ".Lcurrent :", then the label's redefined because of
the ".rept". If I assign the "0b" to something, we're back with the
unmodified code, which clang issues an error for:
<instantiation>:3500:6: error: invalid reassignment of non-absolute variable 'x'
x = 0b
^
<instantiation>:2:2: note: while in macro instantiation
.rept 255 - 18 + 1
^
> > .popsection
> >
> > .if ! \has_error
> > --
> > 2.29.2.576.ga3fc446d84-goog
> >
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH] selftests: kvm: remove reassignment of non-absolute variables
2020-12-11 1:04 ` Bill Wendling
@ 2020-12-11 1:07 ` Sean Christopherson
2020-12-11 1:10 ` Bill Wendling
2020-12-11 1:36 ` [PATCH] " Jim Mattson
1 sibling, 1 reply; 10+ messages in thread
From: Sean Christopherson @ 2020-12-11 1:07 UTC (permalink / raw)
To: Bill Wendling
Cc: Paolo Bonzini, linux-kselftest, kvm list, Benjamin Herrenschmidt,
Shuah Khan, Jian Cai
On Thu, Dec 10, 2020, Bill Wendling wrote:
> On Thu, Dec 10, 2020 at 4:50 PM Sean Christopherson <seanjc@google.com> wrote:
> >
> > On Wed, Dec 09, 2020, Bill Wendling wrote:
> > > Clang's integrated assembler does not allow symbols with non-absolute
> > > values to be reassigned. Modify the interrupt entry loop macro to be
> > > compatible with IAS by using a label and an offset.
> > >
> > > Cc: Jian Cai <caij2003@gmail.com>
> > > Signed-off-by: Bill Wendling <morbo@google.com>
> > > References: https://lore.kernel.org/lkml/20200714233024.1789985-1-caij2003@gmail.com/
> > > ---
> > > tools/testing/selftests/kvm/lib/x86_64/handlers.S | 4 ++--
> > > 1 file changed, 2 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/tools/testing/selftests/kvm/lib/x86_64/handlers.S b/tools/testing/selftests/kvm/lib/x86_64/handlers.S
> > > index aaf7bc7d2ce1..3f9181e9a0a7 100644
> > > --- a/tools/testing/selftests/kvm/lib/x86_64/handlers.S
> > > +++ b/tools/testing/selftests/kvm/lib/x86_64/handlers.S
> > > @@ -54,9 +54,9 @@ idt_handlers:
> > > .align 8
> > >
> > > /* Fetch current address and append it to idt_handlers. */
> > > - current_handler = .
> > > +0 :
> > > .pushsection .rodata
> > > -.quad current_handler
> > > + .quad 0b
> >
> > Bit of a silly nit: can we use a named label, or at least a non-zero shorthand?
> > It's really easy to misread "0b" as zeroing out the value, at least for me.
> >
> I don't believe that will work. If I rename "0 :" to something more
> concrete, like ".Lcurrent :", then the label's redefined because of
> the ".rept". If I assign the "0b" to something, we're back with the
> unmodified code, which clang issues an error for:
>
> <instantiation>:3500:6: error: invalid reassignment of non-absolute variable 'x'
> x = 0b
> ^
> <instantiation>:2:2: note: while in macro instantiation
> .rept 255 - 18 + 1
Boo. I assume 1: and 1b work? Or my KVM favorite "666:" :-) That's enough to
at least make me pause and actually read the code.
> ^
>
> > > .popsection
> > >
> > > .if ! \has_error
> > > --
> > > 2.29.2.576.ga3fc446d84-goog
> > >
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH] selftests: kvm: remove reassignment of non-absolute variables
2020-12-11 1:07 ` Sean Christopherson
@ 2020-12-11 1:10 ` Bill Wendling
2020-12-11 1:19 ` Sean Christopherson
0 siblings, 1 reply; 10+ messages in thread
From: Bill Wendling @ 2020-12-11 1:10 UTC (permalink / raw)
To: Sean Christopherson
Cc: Paolo Bonzini, linux-kselftest, kvm list, Benjamin Herrenschmidt,
Shuah Khan, Jian Cai
On Thu, Dec 10, 2020 at 5:07 PM Sean Christopherson <seanjc@google.com> wrote:
> On Thu, Dec 10, 2020, Bill Wendling wrote:
> > On Thu, Dec 10, 2020 at 4:50 PM Sean Christopherson <seanjc@google.com> wrote:
> > > On Wed, Dec 09, 2020, Bill Wendling wrote:
> > > > Clang's integrated assembler does not allow symbols with non-absolute
> > > > values to be reassigned. Modify the interrupt entry loop macro to be
> > > > compatible with IAS by using a label and an offset.
> > > >
> > > > Cc: Jian Cai <caij2003@gmail.com>
> > > > Signed-off-by: Bill Wendling <morbo@google.com>
> > > > References: https://lore.kernel.org/lkml/20200714233024.1789985-1-caij2003@gmail.com/
> > > > ---
> > > > tools/testing/selftests/kvm/lib/x86_64/handlers.S | 4 ++--
> > > > 1 file changed, 2 insertions(+), 2 deletions(-)
> > > >
> > > > diff --git a/tools/testing/selftests/kvm/lib/x86_64/handlers.S b/tools/testing/selftests/kvm/lib/x86_64/handlers.S
> > > > index aaf7bc7d2ce1..3f9181e9a0a7 100644
> > > > --- a/tools/testing/selftests/kvm/lib/x86_64/handlers.S
> > > > +++ b/tools/testing/selftests/kvm/lib/x86_64/handlers.S
> > > > @@ -54,9 +54,9 @@ idt_handlers:
> > > > .align 8
> > > >
> > > > /* Fetch current address and append it to idt_handlers. */
> > > > - current_handler = .
> > > > +0 :
> > > > .pushsection .rodata
> > > > -.quad current_handler
> > > > + .quad 0b
> > >
> > > Bit of a silly nit: can we use a named label, or at least a non-zero shorthand?
> > > It's really easy to misread "0b" as zeroing out the value, at least for me.
> > >
> > I don't believe that will work. If I rename "0 :" to something more
> > concrete, like ".Lcurrent :", then the label's redefined because of
> > the ".rept". If I assign the "0b" to something, we're back with the
> > unmodified code, which clang issues an error for:
> >
> > <instantiation>:3500:6: error: invalid reassignment of non-absolute variable 'x'
> > x = 0b
> > ^
> > <instantiation>:2:2: note: while in macro instantiation
> > .rept 255 - 18 + 1
>
> Boo. I assume 1: and 1b work? Or my KVM favorite "666:" :-) That's enough to
> at least make me pause and actually read the code.
>
Ah! I missed the second part of your message (about the non-zero
shorthand). That should work. Sorry about that. :-) Should I submit a
new version of this patch?
-bw
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH] selftests: kvm: remove reassignment of non-absolute variables
2020-12-11 1:10 ` Bill Wendling
@ 2020-12-11 1:19 ` Sean Christopherson
2020-12-11 1:23 ` [PATCH v2] " Bill Wendling
0 siblings, 1 reply; 10+ messages in thread
From: Sean Christopherson @ 2020-12-11 1:19 UTC (permalink / raw)
To: Bill Wendling
Cc: Paolo Bonzini, linux-kselftest, kvm list, Benjamin Herrenschmidt,
Shuah Khan, Jian Cai
On Thu, Dec 10, 2020, Bill Wendling wrote:
> On Thu, Dec 10, 2020 at 5:07 PM Sean Christopherson <seanjc@google.com> wrote:
> > On Thu, Dec 10, 2020, Bill Wendling wrote:
> > > On Thu, Dec 10, 2020 at 4:50 PM Sean Christopherson <seanjc@google.com> wrote:
> > > > On Wed, Dec 09, 2020, Bill Wendling wrote:
> > > > > Clang's integrated assembler does not allow symbols with non-absolute
> > > > > values to be reassigned. Modify the interrupt entry loop macro to be
> > > > > compatible with IAS by using a label and an offset.
> > > > >
> > > > > Cc: Jian Cai <caij2003@gmail.com>
> > > > > Signed-off-by: Bill Wendling <morbo@google.com>
> > > > > References: https://lore.kernel.org/lkml/20200714233024.1789985-1-caij2003@gmail.com/
> > > > > ---
> > > > > tools/testing/selftests/kvm/lib/x86_64/handlers.S | 4 ++--
> > > > > 1 file changed, 2 insertions(+), 2 deletions(-)
> > > > >
> > > > > diff --git a/tools/testing/selftests/kvm/lib/x86_64/handlers.S b/tools/testing/selftests/kvm/lib/x86_64/handlers.S
> > > > > index aaf7bc7d2ce1..3f9181e9a0a7 100644
> > > > > --- a/tools/testing/selftests/kvm/lib/x86_64/handlers.S
> > > > > +++ b/tools/testing/selftests/kvm/lib/x86_64/handlers.S
> > > > > @@ -54,9 +54,9 @@ idt_handlers:
> > > > > .align 8
> > > > >
> > > > > /* Fetch current address and append it to idt_handlers. */
> > > > > - current_handler = .
> > > > > +0 :
> > > > > .pushsection .rodata
> > > > > -.quad current_handler
> > > > > + .quad 0b
> > > >
> > > > Bit of a silly nit: can we use a named label, or at least a non-zero shorthand?
> > > > It's really easy to misread "0b" as zeroing out the value, at least for me.
> > > >
> > > I don't believe that will work. If I rename "0 :" to something more
> > > concrete, like ".Lcurrent :", then the label's redefined because of
> > > the ".rept". If I assign the "0b" to something, we're back with the
> > > unmodified code, which clang issues an error for:
> > >
> > > <instantiation>:3500:6: error: invalid reassignment of non-absolute variable 'x'
> > > x = 0b
> > > ^
> > > <instantiation>:2:2: note: while in macro instantiation
> > > .rept 255 - 18 + 1
> >
> > Boo. I assume 1: and 1b work? Or my KVM favorite "666:" :-) That's enough to
> > at least make me pause and actually read the code.
> >
> Ah! I missed the second part of your message (about the non-zero
> shorthand). That should work. Sorry about that. :-) Should I submit a
> new version of this patch?
That'd probably be easiest. This is trivial enought to fixup when applying, but
we might as well save a few of Paolo's cycles for other things.
Thanks!
^ permalink raw reply [flat|nested] 10+ messages in thread
* [PATCH v2] selftests: kvm: remove reassignment of non-absolute variables
2020-12-11 1:19 ` Sean Christopherson
@ 2020-12-11 1:23 ` Bill Wendling
2021-05-03 18:37 ` Jim Mattson
0 siblings, 1 reply; 10+ messages in thread
From: Bill Wendling @ 2020-12-11 1:23 UTC (permalink / raw)
To: Paolo Bonzini, linux-kselftest, kvm, Sean Christopherson
Cc: Benjamin Herrenschmidt, Shuah Khan, Bill Wendling, Jian Cai
Clang's integrated assembler does not allow symbols with non-absolute
values to be reassigned. Modify the interrupt entry loop macro to be
compatible with IAS by using a label and an offset.
Cc: Jian Cai <caij2003@gmail.com>
Signed-off-by: Bill Wendling <morbo@google.com>
References: https://lore.kernel.org/lkml/20200714233024.1789985-1-caij2003@gmail.com/
---
tools/testing/selftests/kvm/lib/x86_64/handlers.S | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/tools/testing/selftests/kvm/lib/x86_64/handlers.S b/tools/testing/selftests/kvm/lib/x86_64/handlers.S
index aaf7bc7d2ce1..7629819734af 100644
--- a/tools/testing/selftests/kvm/lib/x86_64/handlers.S
+++ b/tools/testing/selftests/kvm/lib/x86_64/handlers.S
@@ -54,9 +54,9 @@ idt_handlers:
.align 8
/* Fetch current address and append it to idt_handlers. */
- current_handler = .
+666 :
.pushsection .rodata
-.quad current_handler
+ .quad 666b
.popsection
.if ! \has_error
--
2.29.2.576.ga3fc446d84-goog
^ permalink raw reply related [flat|nested] 10+ messages in thread
* Re: [PATCH] selftests: kvm: remove reassignment of non-absolute variables
2020-12-11 1:04 ` Bill Wendling
2020-12-11 1:07 ` Sean Christopherson
@ 2020-12-11 1:36 ` Jim Mattson
1 sibling, 0 replies; 10+ messages in thread
From: Jim Mattson @ 2020-12-11 1:36 UTC (permalink / raw)
To: Bill Wendling
Cc: Sean Christopherson, Paolo Bonzini,
open list:KERNEL SELFTEST FRAMEWORK, kvm list,
Benjamin Herrenschmidt, Shuah Khan, Jian Cai
By non-zero, I think Sean means something like:
666:
.pushsection .rodata
.quad 666b
On Thu, Dec 10, 2020 at 5:34 PM Bill Wendling <morbo@google.com> wrote:
>
> On Thu, Dec 10, 2020 at 4:50 PM Sean Christopherson <seanjc@google.com> wrote:
> >
> > On Wed, Dec 09, 2020, Bill Wendling wrote:
> > > Clang's integrated assembler does not allow symbols with non-absolute
> > > values to be reassigned. Modify the interrupt entry loop macro to be
> > > compatible with IAS by using a label and an offset.
> > >
> > > Cc: Jian Cai <caij2003@gmail.com>
> > > Signed-off-by: Bill Wendling <morbo@google.com>
> > > References: https://lore.kernel.org/lkml/20200714233024.1789985-1-caij2003@gmail.com/
> > > ---
> > > tools/testing/selftests/kvm/lib/x86_64/handlers.S | 4 ++--
> > > 1 file changed, 2 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/tools/testing/selftests/kvm/lib/x86_64/handlers.S b/tools/testing/selftests/kvm/lib/x86_64/handlers.S
> > > index aaf7bc7d2ce1..3f9181e9a0a7 100644
> > > --- a/tools/testing/selftests/kvm/lib/x86_64/handlers.S
> > > +++ b/tools/testing/selftests/kvm/lib/x86_64/handlers.S
> > > @@ -54,9 +54,9 @@ idt_handlers:
> > > .align 8
> > >
> > > /* Fetch current address and append it to idt_handlers. */
> > > - current_handler = .
> > > +0 :
> > > .pushsection .rodata
> > > -.quad current_handler
> > > + .quad 0b
> >
> > Bit of a silly nit: can we use a named label, or at least a non-zero shorthand?
> > It's really easy to misread "0b" as zeroing out the value, at least for me.
> >
> I don't believe that will work. If I rename "0 :" to something more
> concrete, like ".Lcurrent :", then the label's redefined because of
> the ".rept". If I assign the "0b" to something, we're back with the
> unmodified code, which clang issues an error for:
>
> <instantiation>:3500:6: error: invalid reassignment of non-absolute variable 'x'
> x = 0b
> ^
> <instantiation>:2:2: note: while in macro instantiation
> .rept 255 - 18 + 1
> ^
>
> > > .popsection
> > >
> > > .if ! \has_error
> > > --
> > > 2.29.2.576.ga3fc446d84-goog
> > >
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH v2] selftests: kvm: remove reassignment of non-absolute variables
2020-12-11 1:23 ` [PATCH v2] " Bill Wendling
@ 2021-05-03 18:37 ` Jim Mattson
2021-05-04 7:22 ` Paolo Bonzini
0 siblings, 1 reply; 10+ messages in thread
From: Jim Mattson @ 2021-05-03 18:37 UTC (permalink / raw)
To: Bill Wendling
Cc: Paolo Bonzini, open list:KERNEL SELFTEST FRAMEWORK, kvm list,
Sean Christopherson, Benjamin Herrenschmidt, Shuah Khan,
Jian Cai
On Thu, Dec 10, 2020 at 7:58 PM Bill Wendling <morbo@google.com> wrote:
>
> Clang's integrated assembler does not allow symbols with non-absolute
> values to be reassigned. Modify the interrupt entry loop macro to be
> compatible with IAS by using a label and an offset.
>
> Cc: Jian Cai <caij2003@gmail.com>
> Signed-off-by: Bill Wendling <morbo@google.com>
> References: https://lore.kernel.org/lkml/20200714233024.1789985-1-caij2003@gmail.com/
Reviewed-by: Jim Mattson <jmattson@google.com>
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH v2] selftests: kvm: remove reassignment of non-absolute variables
2021-05-03 18:37 ` Jim Mattson
@ 2021-05-04 7:22 ` Paolo Bonzini
0 siblings, 0 replies; 10+ messages in thread
From: Paolo Bonzini @ 2021-05-04 7:22 UTC (permalink / raw)
To: Jim Mattson, Bill Wendling
Cc: open list:KERNEL SELFTEST FRAMEWORK, kvm list,
Sean Christopherson, Benjamin Herrenschmidt, Shuah Khan,
Jian Cai
On 03/05/21 20:37, Jim Mattson wrote:
> On Thu, Dec 10, 2020 at 7:58 PM Bill Wendling <morbo@google.com> wrote:
>>
>> Clang's integrated assembler does not allow symbols with non-absolute
>> values to be reassigned. Modify the interrupt entry loop macro to be
>> compatible with IAS by using a label and an offset.
>>
>> Cc: Jian Cai <caij2003@gmail.com>
>> Signed-off-by: Bill Wendling <morbo@google.com>
>> References: https://lore.kernel.org/lkml/20200714233024.1789985-1-caij2003@gmail.com/
> Reviewed-by: Jim Mattson <jmattson@google.com>
>
Queued, thanks.
Paolo
^ permalink raw reply [flat|nested] 10+ messages in thread
end of thread, other threads:[~2021-05-04 7:22 UTC | newest]
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2020-12-10 4:36 [PATCH] selftests: kvm: remove reassignment of non-absolute variables Bill Wendling
2020-12-11 0:50 ` Sean Christopherson
2020-12-11 1:04 ` Bill Wendling
2020-12-11 1:07 ` Sean Christopherson
2020-12-11 1:10 ` Bill Wendling
2020-12-11 1:19 ` Sean Christopherson
2020-12-11 1:23 ` [PATCH v2] " Bill Wendling
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2020-12-11 1:36 ` [PATCH] " Jim Mattson
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