In my config with PROVE_LOCKING=n and FTRACE=y (which defaults
IRQSOFF_TRACER to y), I get the following warning from make oldconfig.
scripts/kconfig/conf --oldconfig arch/x86/Kconfig
warning: (IRQSOFF_TRACER && TRACING_SUPPORT && FTRACE &&
TRACE_IRQFLAGS_SUPPORT && !ARCH_USES_GETTIMEOFFSET) selects
TRACE_IRQFLAGS which has unmet direct dependencies (DEBUG_KERNEL &&
TRACE_IRQFLAGS_SUPPORT && PROVE_LOCKING)
The problem is that TRACE_IRQFLAGS depends on PROVE_LOCKING.
Should it select PROVE_LOCKING instead? or is there a better way to fix
The TRACE_IRQFLAGS was originally written for lockdep, but it is now
used by Ftrace's irqsoff tracer.
I just compiled and booted with TRACE_IRQFLAGS=y and PROVE_LOCKING not
set, and it worked fine.
I think the correct patch is to remove the dependency of TRACE_IRQFLAGS