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Merge branch 'locking/nmi' into locking/core, to pick up completed topic branch

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Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar 2020-08-03 13:00:27 +02:00
commit 992414a18c
3 changed files with 16 additions and 1 deletions
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3
arch/x86/Kconfig.debug
View File

@ -3,6 +3,9 @@
config TRACE_IRQFLAGS_SUPPORT
def_bool y
config TRACE_IRQFLAGS_NMI_SUPPORT
def_bool y
config EARLY_PRINTK_USB
bool

8
kernel/locking/lockdep.c
View File

@ -3714,6 +3714,9 @@ void noinstr lockdep_hardirqs_on(unsigned long ip)
* and not rely on hardware state like normal interrupts.
*/
if (unlikely(in_nmi())) {
if (!IS_ENABLED(CONFIG_TRACE_IRQFLAGS_NMI))
return;
/*
* Skip:
* - recursion check, because NMI can hit lockdep;
@ -3773,7 +3776,10 @@ void noinstr lockdep_hardirqs_off(unsigned long ip)
* they will restore the software state. This ensures the software
* state is consistent inside NMIs as well.
*/
if (unlikely(!in_nmi() && (current->lockdep_recursion & LOCKDEP_RECURSION_MASK)))
if (in_nmi()) {
if (!IS_ENABLED(CONFIG_TRACE_IRQFLAGS_NMI))
return;
} else if (current->lockdep_recursion & LOCKDEP_RECURSION_MASK)
return;
/*

6
lib/Kconfig.debug
View File

@ -1326,11 +1326,17 @@ config WW_MUTEX_SELFTEST
endmenu # lock debugging
config TRACE_IRQFLAGS
depends on TRACE_IRQFLAGS_SUPPORT
bool
help
Enables hooks to interrupt enabling and disabling for
either tracing or lock debugging.
config TRACE_IRQFLAGS_NMI
def_bool y
depends on TRACE_IRQFLAGS
depends on TRACE_IRQFLAGS_NMI_SUPPORT
config STACKTRACE
bool "Stack backtrace support"
depends on STACKTRACE_SUPPORT