The branch main has been updated by kib:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=2bd0506c8d94a2c581dd16407f3a1c159a38769b

commit 2bd0506c8d94a2c581dd16407f3a1c159a38769b
Author:     Konstantin Belousov <[email protected]>
AuthorDate: 2021-04-30 21:14:26 +0000
Commit:     Konstantin Belousov <[email protected]>
CommitDate: 2021-05-03 16:13:48 +0000

    kern_ptrace: change type of proctree_locked to bool
    
    Tested by:      pho
    Sponsored by:   The FreeBSD Foundation
    MFC after:      1 week
    Differential revision:  https://reviews.freebsd.org/D29955
---
 sys/kern/sys_process.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/sys/kern/sys_process.c b/sys/kern/sys_process.c
index 27a690e65638..492ef287ca53 100644
--- a/sys/kern/sys_process.c
+++ b/sys/kern/sys_process.c
@@ -612,13 +612,14 @@ kern_ptrace(struct thread *td, int req, pid_t pid, void 
*addr, int data)
        struct ptrace_lwpinfo *pl;
        struct ptrace_sc_ret *psr;
        int error, num, tmp;
-       int proctree_locked = 0;
        lwpid_t tid = 0, *buf;
 #ifdef COMPAT_FREEBSD32
        int wrap32 = 0, safe = 0;
 #endif
+       bool proctree_locked;
 
        curp = td->td_proc;
+       proctree_locked = false;
 
        /* Lock proctree before locking the process. */
        switch (req) {
@@ -636,7 +637,7 @@ kern_ptrace(struct thread *td, int req, pid_t pid, void 
*addr, int data)
        case PT_DETACH:
        case PT_GET_SC_ARGS:
                sx_xlock(&proctree_lock);
-               proctree_locked = 1;
+               proctree_locked = true;
                break;
        default:
                break;
@@ -816,7 +817,7 @@ kern_ptrace(struct thread *td, int req, pid_t pid, void 
*addr, int data)
                    p->p_oppid);
 
                sx_xunlock(&proctree_lock);
-               proctree_locked = 0;
+               proctree_locked = false;
                MPASS(p->p_xthread == NULL);
                MPASS((p->p_flag & P_STOPPED_TRACE) == 0);
 
@@ -1053,10 +1054,10 @@ kern_ptrace(struct thread *td, int req, pid_t pid, void 
*addr, int data)
                }
 
                sx_xunlock(&proctree_lock);
-               proctree_locked = 0;
+               proctree_locked = false;
 
        sendsig:
-               MPASS(proctree_locked == 0);
+               MPASS(!proctree_locked);
 
                /*
                 * Clear the pending event for the thread that just
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