git: 2e46d0c3d983 - main - linux(4): Implement futex_time64 system call.
Dmitry Chagin
dchagin at FreeBSD.org
Thu Jun 10 11:30:03 UTC 2021
The branch main has been updated by dchagin:
URL: https://cgit.FreeBSD.org/src/commit/?id=2e46d0c3d983ccd603b9bcfb318c37404b0dbc7f
commit 2e46d0c3d983ccd603b9bcfb318c37404b0dbc7f
Author: Dmitry Chagin <dchagin at FreeBSD.org>
AuthorDate: 2021-06-10 11:27:06 +0000
Commit: Dmitry Chagin <dchagin at FreeBSD.org>
CommitDate: 2021-06-10 11:27:06 +0000
linux(4): Implement futex_time64 system call.
MFC after: 2 weeks
---
sys/amd64/linux32/linux32_dummy_machdep.c | 1 -
sys/amd64/linux32/syscalls.master | 9 +-
sys/compat/linux/linux_futex.c | 218 ++++++++++++++++++------------
sys/compat/linux/linux_futex.h | 3 +
sys/i386/linux/linux_dummy_machdep.c | 1 -
sys/i386/linux/syscalls.master | 9 +-
6 files changed, 153 insertions(+), 88 deletions(-)
diff --git a/sys/amd64/linux32/linux32_dummy_machdep.c b/sys/amd64/linux32/linux32_dummy_machdep.c
index 041156bd514b..bfb4ff71e0b1 100644
--- a/sys/amd64/linux32/linux32_dummy_machdep.c
+++ b/sys/amd64/linux32/linux32_dummy_machdep.c
@@ -80,5 +80,4 @@ DUMMY(mq_timedsend_time64);
DUMMY(mq_timedreceive_time64);
DUMMY(semtimedop_time64);
DUMMY(rt_sigtimedwait_time64);
-DUMMY(futex_time64);
DUMMY(sched_rr_get_interval_time64);
diff --git a/sys/amd64/linux32/syscalls.master b/sys/amd64/linux32/syscalls.master
index 03523f45ced6..bf2778bb91fd 100644
--- a/sys/amd64/linux32/syscalls.master
+++ b/sys/amd64/linux32/syscalls.master
@@ -2415,7 +2415,14 @@
int linux_rt_sigtimedwait_time64(void);
}
422 AUE_NULL STD {
- int linux_futex_time64(void);
+ int linux_sys_futex_time64(
+ uint32_t *uaddr,
+ l_int op,
+ uint32_t val,
+ struct l_timespec64 *timeout,
+ uint32_t *uaddr2,
+ uint32_t val3
+ );
}
423 AUE_NULL STD {
int linux_sched_rr_get_interval_time64(void);
diff --git a/sys/compat/linux/linux_futex.c b/sys/compat/linux/linux_futex.c
index 11836e93d71c..6d4c31a8a6df 100644
--- a/sys/compat/linux/linux_futex.c
+++ b/sys/compat/linux/linux_futex.c
@@ -117,29 +117,29 @@ LIN_SDT_PROBE_DEFINE4(futex, futex_atomic_op, decoded_op, "int", "int", "int",
LIN_SDT_PROBE_DEFINE0(futex, futex_atomic_op, missing_access_check);
LIN_SDT_PROBE_DEFINE1(futex, futex_atomic_op, unimplemented_op, "int");
LIN_SDT_PROBE_DEFINE1(futex, futex_atomic_op, unimplemented_cmp, "int");
-LIN_SDT_PROBE_DEFINE0(futex, linux_sys_futex, unimplemented_clockswitch);
-LIN_SDT_PROBE_DEFINE1(futex, linux_sys_futex, copyin_error, "int");
-LIN_SDT_PROBE_DEFINE0(futex, linux_sys_futex, invalid_cmp_requeue_use);
-LIN_SDT_PROBE_DEFINE3(futex, linux_sys_futex, debug_wait, "uint32_t *",
+LIN_SDT_PROBE_DEFINE0(futex, linux_futex, unimplemented_clockswitch);
+LIN_SDT_PROBE_DEFINE1(futex, linux_futex, copyin_error, "int");
+LIN_SDT_PROBE_DEFINE0(futex, linux_futex, invalid_cmp_requeue_use);
+LIN_SDT_PROBE_DEFINE3(futex, linux_futex, debug_wait, "uint32_t *",
"uint32_t", "uint32_t");
-LIN_SDT_PROBE_DEFINE4(futex, linux_sys_futex, debug_wait_value_neq,
+LIN_SDT_PROBE_DEFINE4(futex, linux_futex, debug_wait_value_neq,
"uint32_t *", "uint32_t", "int", "uint32_t");
-LIN_SDT_PROBE_DEFINE3(futex, linux_sys_futex, debug_wake, "uint32_t *",
+LIN_SDT_PROBE_DEFINE3(futex, linux_futex, debug_wake, "uint32_t *",
"uint32_t", "uint32_t");
-LIN_SDT_PROBE_DEFINE5(futex, linux_sys_futex, debug_cmp_requeue, "uint32_t *",
+LIN_SDT_PROBE_DEFINE5(futex, linux_futex, debug_cmp_requeue, "uint32_t *",
"uint32_t", "uint32_t", "uint32_t *", "struct l_timespec *");
-LIN_SDT_PROBE_DEFINE2(futex, linux_sys_futex, debug_cmp_requeue_value_neq,
+LIN_SDT_PROBE_DEFINE2(futex, linux_futex, debug_cmp_requeue_value_neq,
"uint32_t", "int");
-LIN_SDT_PROBE_DEFINE5(futex, linux_sys_futex, debug_wake_op, "uint32_t *",
+LIN_SDT_PROBE_DEFINE5(futex, linux_futex, debug_wake_op, "uint32_t *",
"int", "uint32_t", "uint32_t *", "uint32_t");
-LIN_SDT_PROBE_DEFINE0(futex, linux_sys_futex, unhandled_efault);
-LIN_SDT_PROBE_DEFINE0(futex, linux_sys_futex, unimplemented_lock_pi);
-LIN_SDT_PROBE_DEFINE0(futex, linux_sys_futex, unimplemented_unlock_pi);
-LIN_SDT_PROBE_DEFINE0(futex, linux_sys_futex, unimplemented_trylock_pi);
-LIN_SDT_PROBE_DEFINE0(futex, linux_sys_futex, deprecated_requeue);
-LIN_SDT_PROBE_DEFINE0(futex, linux_sys_futex, unimplemented_wait_requeue_pi);
-LIN_SDT_PROBE_DEFINE0(futex, linux_sys_futex, unimplemented_cmp_requeue_pi);
-LIN_SDT_PROBE_DEFINE1(futex, linux_sys_futex, unknown_operation, "int");
+LIN_SDT_PROBE_DEFINE0(futex, linux_futex, unhandled_efault);
+LIN_SDT_PROBE_DEFINE0(futex, linux_futex, unimplemented_lock_pi);
+LIN_SDT_PROBE_DEFINE0(futex, linux_futex, unimplemented_unlock_pi);
+LIN_SDT_PROBE_DEFINE0(futex, linux_futex, unimplemented_trylock_pi);
+LIN_SDT_PROBE_DEFINE0(futex, linux_futex, deprecated_requeue);
+LIN_SDT_PROBE_DEFINE0(futex, linux_futex, unimplemented_wait_requeue_pi);
+LIN_SDT_PROBE_DEFINE0(futex, linux_futex, unimplemented_cmp_requeue_pi);
+LIN_SDT_PROBE_DEFINE1(futex, linux_futex, unknown_operation, "int");
LIN_SDT_PROBE_DEFINE0(futex, linux_set_robust_list, size_error);
LIN_SDT_PROBE_DEFINE1(futex, linux_get_robust_list, copyout_error, "int");
LIN_SDT_PROBE_DEFINE1(futex, handle_futex_death, copyin_error, "int");
@@ -215,8 +215,6 @@ static int futex_get(uint32_t *, struct waiting_proc **, struct futex **,
static int futex_sleep(struct futex *, struct waiting_proc *, struct timespec *);
static int futex_wake(struct futex *, int, uint32_t);
static int futex_requeue(struct futex *, int, struct futex *, int);
-static int futex_copyin_timeout(int, struct l_timespec *, int,
- struct timespec *);
static int futex_wait(struct futex *, struct waiting_proc *, struct timespec *,
uint32_t);
static void futex_lock(struct futex *);
@@ -227,30 +225,17 @@ static int handle_futex_death(struct linux_emuldata *, uint32_t *,
static int fetch_robust_entry(struct linux_robust_list **,
struct linux_robust_list **, unsigned int *);
-static int
-futex_copyin_timeout(int op, struct l_timespec *luts, int clockrt,
- struct timespec *ts)
-{
- struct l_timespec lts;
- struct timespec kts;
- int error;
-
- error = copyin(luts, <s, sizeof(lts));
- if (error)
- return (error);
+struct linux_futex_args {
+ uint32_t *uaddr;
+ int32_t op;
+ uint32_t val;
+ struct timespec *ts;
+ uint32_t *uaddr2;
+ uint32_t val3;
+ struct timespec kts;
+};
- error = linux_to_native_timespec(ts, <s);
- if (error)
- return (error);
- if (clockrt) {
- nanotime(&kts);
- timespecsub(ts, &kts, ts);
- } else if (op == LINUX_FUTEX_WAIT_BITSET) {
- nanouptime(&kts);
- timespecsub(ts, &kts, ts);
- }
- return (error);
-}
+static int linux_futex(struct thread *, struct linux_futex_args *);
static void
futex_put(struct futex *f, struct waiting_proc *wp)
@@ -430,19 +415,17 @@ futex_unlock(struct futex *f)
static int
futex_sleep(struct futex *f, struct waiting_proc *wp, struct timespec *ts)
{
- struct timespec uts;
sbintime_t sbt, prec, tmp;
time_t over;
int error;
FUTEX_ASSERT_LOCKED(f);
if (ts != NULL) {
- uts = *ts;
- if (uts.tv_sec > INT32_MAX / 2) {
- over = uts.tv_sec - INT32_MAX / 2;
- uts.tv_sec -= over;
+ if (ts->tv_sec > INT32_MAX / 2) {
+ over = ts->tv_sec - INT32_MAX / 2;
+ ts->tv_sec -= over;
}
- tmp = tstosbt(uts);
+ tmp = tstosbt(*ts);
if (TIMESEL(&sbt, tmp))
sbt += tc_tick_sbt;
sbt += tmp;
@@ -655,14 +638,14 @@ futex_atomic_op(struct thread *td, int encoded_op, uint32_t *uaddr)
return (ret);
}
-int
-linux_sys_futex(struct thread *td, struct linux_sys_futex_args *args)
+static int
+linux_futex(struct thread *td, struct linux_futex_args *args)
{
int clockrt, nrwake, nrrequeue, op_ret, ret;
struct linux_pemuldata *pem;
struct waiting_proc *wp;
struct futex *f, *f2;
- struct timespec uts, *ts;
+ struct timespec kts;
int error, save;
uint32_t flags, val;
@@ -682,7 +665,7 @@ linux_sys_futex(struct thread *td, struct linux_sys_futex_args *args)
args->op = args->op & ~LINUX_FUTEX_CLOCK_REALTIME;
if (clockrt && args->op != LINUX_FUTEX_WAIT_BITSET &&
args->op != LINUX_FUTEX_WAIT_REQUEUE_PI) {
- LIN_SDT_PROBE0(futex, linux_sys_futex,
+ LIN_SDT_PROBE0(futex, linux_futex,
unimplemented_clockswitch);
return (ENOSYS);
}
@@ -696,22 +679,20 @@ linux_sys_futex(struct thread *td, struct linux_sys_futex_args *args)
/* FALLTHROUGH */
case LINUX_FUTEX_WAIT_BITSET:
- LIN_SDT_PROBE3(futex, linux_sys_futex, debug_wait, args->uaddr,
+ LIN_SDT_PROBE3(futex, linux_futex, debug_wait, args->uaddr,
args->val, args->val3);
LINUX_CTR3(sys_futex, "WAIT uaddr %p val 0x%x bitset 0x%x",
args->uaddr, args->val, args->val3);
- if (args->timeout != NULL) {
- error = futex_copyin_timeout(args->op, args->timeout,
- clockrt, &uts);
- if (error) {
- LIN_SDT_PROBE1(futex, linux_sys_futex, copyin_error,
- error);
- return (error);
+ if (args->ts != NULL) {
+ if (clockrt) {
+ nanotime(&kts);
+ timespecsub(args->ts, &kts, args->ts);
+ } else if (args->op == LINUX_FUTEX_WAIT_BITSET) {
+ nanouptime(&kts);
+ timespecsub(args->ts, &kts, args->ts);
}
- ts = &uts;
- } else
- ts = NULL;
+ }
retry0:
error = futex_get(args->uaddr, &wp, &f,
@@ -725,14 +706,14 @@ retry0:
error = copyin(args->uaddr, &val, sizeof(val));
if (error == 0)
goto retry0;
- LIN_SDT_PROBE1(futex, linux_sys_futex, copyin_error,
+ LIN_SDT_PROBE1(futex, linux_futex, copyin_error,
error);
LINUX_CTR1(sys_futex, "WAIT copyin failed %d",
error);
return (error);
}
if (val != args->val) {
- LIN_SDT_PROBE4(futex, linux_sys_futex,
+ LIN_SDT_PROBE4(futex, linux_futex,
debug_wait_value_neq, args->uaddr, args->val, val,
args->val3);
LINUX_CTR3(sys_futex,
@@ -742,7 +723,7 @@ retry0:
return (EWOULDBLOCK);
}
- error = futex_wait(f, wp, ts, args->val3);
+ error = futex_wait(f, wp, args->ts, args->val3);
break;
case LINUX_FUTEX_WAKE:
@@ -750,7 +731,7 @@ retry0:
/* FALLTHROUGH */
case LINUX_FUTEX_WAKE_BITSET:
- LIN_SDT_PROBE3(futex, linux_sys_futex, debug_wake, args->uaddr,
+ LIN_SDT_PROBE3(futex, linux_futex, debug_wake, args->uaddr,
args->val, args->val3);
LINUX_CTR3(sys_futex, "WAKE uaddr %p nrwake 0x%x bitset 0x%x",
args->uaddr, args->val, args->val3);
@@ -769,25 +750,25 @@ retry0:
break;
case LINUX_FUTEX_CMP_REQUEUE:
- LIN_SDT_PROBE5(futex, linux_sys_futex, debug_cmp_requeue,
+ LIN_SDT_PROBE5(futex, linux_futex, debug_cmp_requeue,
args->uaddr, args->val, args->val3, args->uaddr2,
- args->timeout);
+ args->ts);
LINUX_CTR5(sys_futex, "CMP_REQUEUE uaddr %p "
"nrwake 0x%x uval 0x%x uaddr2 %p nrequeue 0x%x",
args->uaddr, args->val, args->val3, args->uaddr2,
- args->timeout);
+ args->ts);
/*
* Linux allows this, we would not, it is an incorrect
* usage of declared ABI, so return EINVAL.
*/
if (args->uaddr == args->uaddr2) {
- LIN_SDT_PROBE0(futex, linux_sys_futex,
+ LIN_SDT_PROBE0(futex, linux_futex,
invalid_cmp_requeue_use);
return (EINVAL);
}
- nrrequeue = (int)(unsigned long)args->timeout;
+ nrrequeue = (int)(unsigned long)args->ts;
nrwake = args->val;
/*
* Sanity check to prevent signed integer overflow,
@@ -823,14 +804,14 @@ retry1:
error = copyin(args->uaddr, &val, sizeof(val));
if (error == 0)
goto retry1;
- LIN_SDT_PROBE1(futex, linux_sys_futex, copyin_error,
+ LIN_SDT_PROBE1(futex, linux_futex, copyin_error,
error);
LINUX_CTR1(sys_futex, "CMP_REQUEUE copyin failed %d",
error);
return (error);
}
if (val != args->val3) {
- LIN_SDT_PROBE2(futex, linux_sys_futex,
+ LIN_SDT_PROBE2(futex, linux_futex,
debug_cmp_requeue_value_neq, args->val, val);
LINUX_CTR2(sys_futex, "CMP_REQUEUE val 0x%x != uval 0x%x",
args->val, val);
@@ -845,12 +826,12 @@ retry1:
break;
case LINUX_FUTEX_WAKE_OP:
- LIN_SDT_PROBE5(futex, linux_sys_futex, debug_wake_op,
+ LIN_SDT_PROBE5(futex, linux_futex, debug_wake_op,
args->uaddr, args->op, args->val, args->uaddr2, args->val3);
LINUX_CTR5(sys_futex, "WAKE_OP "
"uaddr %p nrwake 0x%x uaddr2 %p op 0x%x nrwake2 0x%x",
args->uaddr, args->val, args->uaddr2, args->val3,
- args->timeout);
+ args->ts);
if (args->uaddr == args->uaddr2)
return (EINVAL);
@@ -893,7 +874,7 @@ retry2:
if (op_ret > 0) {
op_ret = 0;
- nrwake = (int)(unsigned long)args->timeout;
+ nrwake = (int)(unsigned long)args->ts;
if (f2 != NULL)
op_ret += futex_wake(f2, nrwake, args->val3);
@@ -913,7 +894,7 @@ retry2:
if ((pem->flags & LINUX_XUNSUP_FUTEXPIOP) == 0) {
linux_msg(td, "unsupported FUTEX_LOCK_PI");
pem->flags |= LINUX_XUNSUP_FUTEXPIOP;
- LIN_SDT_PROBE0(futex, linux_sys_futex,
+ LIN_SDT_PROBE0(futex, linux_futex,
unimplemented_lock_pi);
}
return (ENOSYS);
@@ -924,7 +905,7 @@ retry2:
if ((pem->flags & LINUX_XUNSUP_FUTEXPIOP) == 0) {
linux_msg(td, "unsupported FUTEX_UNLOCK_PI");
pem->flags |= LINUX_XUNSUP_FUTEXPIOP;
- LIN_SDT_PROBE0(futex, linux_sys_futex,
+ LIN_SDT_PROBE0(futex, linux_futex,
unimplemented_unlock_pi);
}
return (ENOSYS);
@@ -935,7 +916,7 @@ retry2:
if ((pem->flags & LINUX_XUNSUP_FUTEXPIOP) == 0) {
linux_msg(td, "unsupported FUTEX_TRYLOCK_PI");
pem->flags |= LINUX_XUNSUP_FUTEXPIOP;
- LIN_SDT_PROBE0(futex, linux_sys_futex,
+ LIN_SDT_PROBE0(futex, linux_futex,
unimplemented_trylock_pi);
}
return (ENOSYS);
@@ -951,7 +932,7 @@ retry2:
if ((pem->flags & LINUX_XDEPR_REQUEUEOP) == 0) {
linux_msg(td, "unsupported FUTEX_REQUEUE");
pem->flags |= LINUX_XDEPR_REQUEUEOP;
- LIN_SDT_PROBE0(futex, linux_sys_futex,
+ LIN_SDT_PROBE0(futex, linux_futex,
deprecated_requeue);
}
return (EINVAL);
@@ -962,7 +943,7 @@ retry2:
if ((pem->flags & LINUX_XUNSUP_FUTEXPIOP) == 0) {
linux_msg(td, "unsupported FUTEX_WAIT_REQUEUE_PI");
pem->flags |= LINUX_XUNSUP_FUTEXPIOP;
- LIN_SDT_PROBE0(futex, linux_sys_futex,
+ LIN_SDT_PROBE0(futex, linux_futex,
unimplemented_wait_requeue_pi);
}
return (ENOSYS);
@@ -973,14 +954,14 @@ retry2:
if ((pem->flags & LINUX_XUNSUP_FUTEXPIOP) == 0) {
linux_msg(td, "unsupported FUTEX_CMP_REQUEUE_PI");
pem->flags |= LINUX_XUNSUP_FUTEXPIOP;
- LIN_SDT_PROBE0(futex, linux_sys_futex,
+ LIN_SDT_PROBE0(futex, linux_futex,
unimplemented_cmp_requeue_pi);
}
return (ENOSYS);
default:
linux_msg(td, "unsupported futex op %d", args->op);
- LIN_SDT_PROBE1(futex, linux_sys_futex, unknown_operation,
+ LIN_SDT_PROBE1(futex, linux_futex, unknown_operation,
args->op);
return (ENOSYS);
}
@@ -988,6 +969,75 @@ retry2:
return (error);
}
+int
+linux_sys_futex(struct thread *td, struct linux_sys_futex_args *args)
+{
+ struct linux_futex_args fargs = {
+ .uaddr = args->uaddr,
+ .op = args->op,
+ .val = args->val,
+ .ts = NULL,
+ .uaddr2 = args->uaddr2,
+ .val3 = args->val3,
+ };
+ struct l_timespec lts;
+ int error;
+
+ switch (args->op & LINUX_FUTEX_CMD_MASK) {
+ case LINUX_FUTEX_WAIT:
+ case LINUX_FUTEX_WAIT_BITSET:
+ if (args->timeout != NULL) {
+ error = copyin(args->timeout, <s, sizeof(lts));
+ if (error != 0)
+ return (error);
+ error = linux_to_native_timespec(&fargs.kts, <s);
+ if (error != 0)
+ return (error);
+ fargs.ts = &fargs.kts;
+ }
+ break;
+ default:
+ fargs.ts = PTRIN(args->timeout);
+ }
+ return (linux_futex(td, &fargs));
+}
+
+#if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
+int
+linux_sys_futex_time64(struct thread *td,
+ struct linux_sys_futex_time64_args *args)
+{
+ struct linux_futex_args fargs = {
+ .uaddr = args->uaddr,
+ .op = args->op,
+ .val = args->val,
+ .ts = NULL,
+ .uaddr2 = args->uaddr2,
+ .val3 = args->val3,
+ };
+ struct l_timespec64 lts;
+ int error;
+
+ switch (args->op & LINUX_FUTEX_CMD_MASK) {
+ case LINUX_FUTEX_WAIT:
+ case LINUX_FUTEX_WAIT_BITSET:
+ if (args->timeout != NULL) {
+ error = copyin(args->timeout, <s, sizeof(lts));
+ if (error != 0)
+ return (error);
+ error = linux_to_native_timespec64(&fargs.kts, <s);
+ if (error != 0)
+ return (error);
+ fargs.ts = &fargs.kts;
+ }
+ break;
+ default:
+ fargs.ts = PTRIN(args->timeout);
+ }
+ return (linux_futex(td, &fargs));
+}
+#endif
+
int
linux_set_robust_list(struct thread *td, struct linux_set_robust_list_args *args)
{
diff --git a/sys/compat/linux/linux_futex.h b/sys/compat/linux/linux_futex.h
index bf546538c981..6ea873d98411 100644
--- a/sys/compat/linux/linux_futex.h
+++ b/sys/compat/linux/linux_futex.h
@@ -55,6 +55,9 @@
#define LINUX_FUTEX_PRIVATE_FLAG 128
#define LINUX_FUTEX_CLOCK_REALTIME 256
+#define LINUX_FUTEX_CMD_MASK ~(LINUX_FUTEX_PRIVATE_FLAG | \
+ LINUX_FUTEX_CLOCK_REALTIME)
+
#define FUTEX_OP_SET 0 /* *(int *)UADDR2 = OPARG; */
#define FUTEX_OP_ADD 1 /* *(int *)UADDR2 += OPARG; */
#define FUTEX_OP_OR 2 /* *(int *)UADDR2 |= OPARG; */
diff --git a/sys/i386/linux/linux_dummy_machdep.c b/sys/i386/linux/linux_dummy_machdep.c
index f679e090c7c1..78503b9453ee 100644
--- a/sys/i386/linux/linux_dummy_machdep.c
+++ b/sys/i386/linux/linux_dummy_machdep.c
@@ -82,5 +82,4 @@ DUMMY(mq_timedsend_time64);
DUMMY(mq_timedreceive_time64);
DUMMY(semtimedop_time64);
DUMMY(rt_sigtimedwait_time64);
-DUMMY(futex_time64);
DUMMY(sched_rr_get_interval_time64);
diff --git a/sys/i386/linux/syscalls.master b/sys/i386/linux/syscalls.master
index a60129ccdaa9..d78f000530e3 100644
--- a/sys/i386/linux/syscalls.master
+++ b/sys/i386/linux/syscalls.master
@@ -2433,7 +2433,14 @@
int linux_rt_sigtimedwait_time64(void);
}
422 AUE_NULL STD {
- int linux_futex_time64(void);
+ int linux_sys_futex_time64(
+ uint32_t *uaddr,
+ l_int op,
+ uint32_t val,
+ struct l_timespec64 *timeout,
+ uint32_t *uaddr2,
+ uint32_t val3
+ );
}
423 AUE_NULL STD {
int linux_sched_rr_get_interval_time64(void);
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