git: 315b002b5304 - stable/13 - linux(4): Handle FUTEX_LOCK_PI2 oeration.

The branch stable/13 has been updated by dchagin:

URL: https://cgit.FreeBSD.org/src/commit/?id=315b002b530460b26f086ccdfb9b5f4205cd1808

commit 315b002b530460b26f086ccdfb9b5f4205cd1808
Author:     Dmitry Chagin <dchagin@FreeBSD.org>
AuthorDate: 2021-07-29 09:55:02 +0000
Commit:     Dmitry Chagin <dchagin@FreeBSD.org>
CommitDate: 2022-06-17 19:33:24 +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
    
    (cherry picked from commit a9bb1b1c188339ed7658103ff5843c161df08799)
---
 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, &lts, 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, &lts, 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