Author: kevans
Date: Wed Jun 20 19:23:56 2018
New Revision: 335458
URL: https://svnweb.freebsd.org/changeset/base/335458
Log:
Add debug.verbose_sysinit tunable for VERBOSE_SYSINIT
VERBOSE_SYSINIT is currently an all-or-nothing option. debug.verbose_sysinit
adds an option to have the code compiled in but quiet by default so that
getting this information from a device in the field doesn't necessarily
require distributing a recompiled kernel.
Its default is VERBOSE_SYSINIT's value as defined in the kernconf. As such,
the default behavior for simply omitting or including this option is
unchanged.
MFC after: 1 week
Modified:
head/sys/kern/init_main.c
Modified: head/sys/kern/init_main.c
==============================================================================
--- head/sys/kern/init_main.c Wed Jun 20 19:22:33 2018 (r335457)
+++ head/sys/kern/init_main.c Wed Jun 20 19:23:56 2018 (r335458)
@@ -119,6 +119,18 @@ int bootverbose = BOOTVERBOSE;
SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, &bootverbose, 0,
"Control the output of verbose kernel messages");
+#ifdef VERBOSE_SYSINIT
+/*
+ * We'll use the defined value of VERBOSE_SYSINIT from the kernel config to
+ * dictate the default VERBOSE_SYSINIT behavior. Significant values for this
+ * option and associated tunable are:
+ * - 0, 'compiled in but silent by default'
+ * - 1, 'compiled in but verbose by default' (default)
+ */
+int verbose_sysinit = VERBOSE_SYSINIT;
+TUNABLE_INT("debug.verbose_sysinit", &verbose_sysinit);
+#endif
+
#ifdef INVARIANTS
FEATURE(invariants, "Kernel compiled with INVARIANTS, may affect performance");
#endif
@@ -268,7 +280,7 @@ restart:
continue;
#if defined(VERBOSE_SYSINIT)
- if ((*sipp)->subsystem > last) {
+ if ((*sipp)->subsystem > last && verbose_sysinit != 0) {
verbose = 1;
last = (*sipp)->subsystem;
printf("subsystem %x\n", last);
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