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Index: head/share/man/man4/linux.4
===================================================================
--- head/share/man/man4/linux.4
+++ head/share/man/man4/linux.4
@@ -24,7 +24,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd June 10, 2020
+.Dd June 12, 2020
.Dt LINUX 4
.Os
.Sh NAME
@@ -95,6 +95,10 @@
.Xr loader 8
tunables:
.Bl -tag -width indent
+.It Va compat.linux.debug
+Enable debugging messages.
+Set to 0 to silence them.
+Defaults to 1.
.It Va compat.linux.default_openfiles
Default soft openfiles resource limit for Linux applications.
Set to -1 to disable the limit.
Index: head/sys/compat/linux/linux_mib.h
===================================================================
--- head/sys/compat/linux/linux_mib.h
+++ head/sys/compat/linux/linux_mib.h
@@ -62,6 +62,7 @@
#define linux_use26(t) (linux_kernver(t) >= LINUX_KERNVER_2006000)
+extern int linux_debug;
extern int linux_default_openfiles;
extern int linux_ignore_ip_recverr;
extern int linux_preserve_vstatus;
Index: head/sys/compat/linux/linux_mib.c
===================================================================
--- head/sys/compat/linux/linux_mib.c
+++ head/sys/compat/linux/linux_mib.c
@@ -63,6 +63,10 @@
SYSCTL_NODE(_compat, OID_AUTO, linux, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"Linux mode");
+int linux_debug = 1;
+SYSCTL_INT(_compat_linux, OID_AUTO, debug, CTLFLAG_RWTUN,
+ &linux_debug, 0, "Log warnings from linux(4); or 0 to disable");
+
int linux_default_openfiles = 1024;
SYSCTL_INT(_compat_linux, OID_AUTO, default_openfiles, CTLFLAG_RWTUN,
&linux_default_openfiles, 0,
Index: head/sys/compat/linux/linux_util.c
===================================================================
--- head/sys/compat/linux/linux_util.c
+++ head/sys/compat/linux/linux_util.c
@@ -91,6 +91,9 @@
va_list ap;
struct proc *p;
+ if (linux_debug == 0)
+ return;
+
p = td->td_proc;
printf("linux: pid %d (%s): ", (int)p->p_pid, p->p_comm);
va_start(ap, fmt);

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