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locking/csd_lock: Add Kconfig option for csd_debug default

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The csd_debug kernel parameter works well, but is inconvenient in cases
where it is more closely associated with boot loaders or automation than
with a particular kernel version or release.  Thererfore, provide a new
CSD_LOCK_WAIT_DEBUG_DEFAULT Kconfig option that defaults csd_debug to
1 when selected and 0 otherwise, with this latter being the default.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/20230321005516.50558-1-paulmck@kernel.org
This commit is contained in:
Paul E. McKenney 2023-03-20 17:55:13 -07:00 committed by Peter Zijlstra
parent e8d018dd02
commit c521986016
3 changed files with 14 additions and 3 deletions
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6
Documentation/admin-guide/kernel-parameters.txt
View file

@ -893,8 +893,10 @@
handling. When switched on, additional debug data is
printed to the console in case a hanging CPU is
detected, and that CPU is pinged again in order to try
to resolve the hang situation.
0: disable csdlock debugging (default)
to resolve the hang situation. The default value of
this option depends on the CSD_LOCK_WAIT_DEBUG_DEFAULT
Kconfig option.
0: disable csdlock debugging
1: enable basic csdlock debugging (minor impact)
ext: enable extended csdlock debugging (more impact,
but more data)

2
kernel/smp.c
View file

@ -158,7 +158,7 @@ void __init call_function_init(void)
#ifdef CONFIG_CSD_LOCK_WAIT_DEBUG
static DEFINE_STATIC_KEY_FALSE(csdlock_debug_enabled);
static DEFINE_STATIC_KEY_MAYBE(CONFIG_CSD_LOCK_WAIT_DEBUG_DEFAULT, csdlock_debug_enabled);
static DEFINE_STATIC_KEY_FALSE(csdlock_debug_extended);
static int __init csdlock_debug(char *str)

9
lib/Kconfig.debug
View file

@ -1480,6 +1480,15 @@ config CSD_LOCK_WAIT_DEBUG
include the IPI handler function currently executing (if any)
and relevant stack traces.
config CSD_LOCK_WAIT_DEBUG_DEFAULT
bool "Default csd_lock_wait() debugging on at boot time"
depends on CSD_LOCK_WAIT_DEBUG
depends on 64BIT
default n
help
This option causes the csdlock_debug= kernel boot parameter to
default to 1 (basic debugging) instead of 0 (no debugging).
endmenu # lock debugging
config TRACE_IRQFLAGS