arch: make TRACE_IRQFLAGS_NMI_SUPPORT generic
authorMark Rutland <mark.rutland@arm.com>
Wed, 11 May 2022 13:17:32 +0000 (14:17 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 17 Aug 2022 12:23:00 +0000 (14:23 +0200)
commitd1e812beae86ee9e8d3fc954374901d58dcd0b05
treee2cfd99077f4eb9739e37765c1504e52a473d3f5
parent932b5e65245c7ac33373fdddd9c369688d39d20c
arch: make TRACE_IRQFLAGS_NMI_SUPPORT generic

[ Upstream commit 4510bffb4d0246cdcc1f14c7367c026b807a862d ]

On most architectures, IRQ flag tracing is disabled in NMI context, and
architectures need to define and select TRACE_IRQFLAGS_NMI_SUPPORT in
order to enable this.

Commit:

  859d069ee1ddd878 ("lockdep: Prepare for NMI IRQ state tracking")

Permitted IRQ flag tracing in NMI context, allowing lockdep to work in
NMI context where an architecture had suitable entry logic. At the time,
most architectures did not have such suitable entry logic, and this broke
lockdep on such architectures. Thus, this was partially disabled in
commit:

  ed00495333ccc80f ("locking/lockdep: Fix TRACE_IRQFLAGS vs. NMIs")

... with architectures needing to select TRACE_IRQFLAGS_NMI_SUPPORT to
enable IRQ flag tracing in NMI context.

Currently TRACE_IRQFLAGS_NMI_SUPPORT is defined under
arch/x86/Kconfig.debug. Move it to arch/Kconfig so architectures can
select it without having to provide their own definition.

Since the regular TRACE_IRQFLAGS_SUPPORT is selected by
arch/x86/Kconfig, the select of TRACE_IRQFLAGS_NMI_SUPPORT is moved
there too.

There should be no functional change as a result of this patch.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20220511131733.4074499-2-mark.rutland@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
arch/Kconfig
arch/x86/Kconfig
arch/x86/Kconfig.debug