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| author | Paul E. McKenney <paulmck@kernel.org> | 2023-03-21 03:55:13 +0300 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2023-03-24 13:01:25 +0300 |
| commit | c52198601695851622f361d3f16456e9fc857629 (patch) | |
| tree | 926d424fa43c6c4e0a24e003375791c291e96594 | |
| parent | e8d018dd0257f744ca50a729e3d042cf2ec9da65 (diff) | |
| download | linux-c52198601695851622f361d3f16456e9fc857629.tar.xz | |
locking/csd_lock: Add Kconfig option for csd_debug default
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
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 6 | ||||
| -rw-r--r-- | kernel/smp.c | 2 | ||||
| -rw-r--r-- | lib/Kconfig.debug | 9 |
3 files changed, 14 insertions, 3 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 6221a1d057dd..ce70777f5999 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -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) diff --git a/kernel/smp.c b/kernel/smp.c index 06a413987a14..e2d558f5cef8 100644 --- a/kernel/smp.c +++ b/kernel/smp.c @@ -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) diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index c8b379e2e9ad..e1b160a0474d 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -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 |