git: a9bb1b1c1883 - main - linux(4): Handle FUTEX_LOCK_PI2 oeration.
Dmitry Chagin
dchagin at FreeBSD.org
Thu Jul 29 09:59:01 UTC 2021
The branch main has been updated by dchagin:
URL: https://cgit.FreeBSD.org/src/commit/?id=a9bb1b1c188339ed7658103ff5843c161df08799
commit a9bb1b1c188339ed7658103ff5843c161df08799
Author: Dmitry Chagin <dchagin at FreeBSD.org>
AuthorDate: 2021-07-29 09:55:02 +0000
Commit: Dmitry Chagin <dchagin at FreeBSD.org>
CommitDate: 2021-07-29 09:55:02 +0000
linux(4): Handle FUTEX_LOCK_PI2 oeration.
FUTEX_LOCK_PI2 was added to support clock selection as FUTEX_LOCK_PI uses a
CLOCK_REALTIME based absolute value since it was implemented, but it does not
require that the FUTEX_CLOCK_REALTIME bit is set, because that was introduced
later.
MFC after: 2 weeks
---
sys/compat/linux/linux_futex.c | 7 ++++++-
sys/compat/linux/linux_futex.h | 1 +
2 files changed, 7 insertions(+), 1 deletion(-)
diff --git a/sys/compat/linux/linux_futex.c b/sys/compat/linux/linux_futex.c
index cc3a685fb14e..fcac2eba4956 100644
--- a/sys/compat/linux/linux_futex.c
+++ b/sys/compat/linux/linux_futex.c
@@ -288,6 +288,9 @@ linux_futex(struct thread *td, struct linux_futex_args *args)
case LINUX_FUTEX_LOCK_PI:
args->clockrt = true;
+ /* FALLTHROUGH */
+
+ case LINUX_FUTEX_LOCK_PI2:
LINUX_CTR2(sys_futex, "LOCKPI uaddr %p val 0x%x",
args->uaddr, args->val);
@@ -789,7 +792,7 @@ linux_umtx_abs_timeout_init(struct umtx_abs_timeout *timo,
/*
* The FUTEX_CLOCK_REALTIME option bit can be employed only with the
- * FUTEX_WAIT_BITSET, FUTEX_WAIT_REQUEUE_PI.
+ * FUTEX_WAIT_BITSET, FUTEX_WAIT_REQUEUE_PI, FUTEX_LOCK_PI2.
* For FUTEX_WAIT, timeout is interpreted as a relative value, for other
* futex operations timeout is interpreted as an absolute value.
* If FUTEX_CLOCK_REALTIME option bit is set, the Linux kernel measures
@@ -820,6 +823,7 @@ linux_sys_futex(struct thread *td, struct linux_sys_futex_args *args)
case LINUX_FUTEX_WAIT:
case LINUX_FUTEX_WAIT_BITSET:
case LINUX_FUTEX_LOCK_PI:
+ case LINUX_FUTEX_LOCK_PI2:
if (args->timeout != NULL) {
error = copyin(args->timeout, <s, sizeof(lts));
if (error != 0)
@@ -857,6 +861,7 @@ linux_sys_futex_time64(struct thread *td,
case LINUX_FUTEX_WAIT:
case LINUX_FUTEX_WAIT_BITSET:
case LINUX_FUTEX_LOCK_PI:
+ case LINUX_FUTEX_LOCK_PI2:
if (args->timeout != NULL) {
error = copyin(args->timeout, <s, sizeof(lts));
if (error != 0)
diff --git a/sys/compat/linux/linux_futex.h b/sys/compat/linux/linux_futex.h
index 4255cbdc7363..189db4e17c4f 100644
--- a/sys/compat/linux/linux_futex.h
+++ b/sys/compat/linux/linux_futex.h
@@ -51,6 +51,7 @@
#define LINUX_FUTEX_WAKE_BITSET 10
#define LINUX_FUTEX_WAIT_REQUEUE_PI 11
#define LINUX_FUTEX_CMP_REQUEUE_PI 12
+#define LINUX_FUTEX_LOCK_PI2 13
#define LINUX_FUTEX_PRIVATE_FLAG 128
#define LINUX_FUTEX_CLOCK_REALTIME 256
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