linux-kernel - [PATCH 5.15 112/779] arch: make TRACE_IRQFLAGS_NMI

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Message-Id: <20220815180342.129998677@linuxfoundation.org>
Date:   Mon, 15 Aug 2022 19:55:56 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Ingo Molnar <mingo@...nel.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will@...nel.org>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 112/779] arch: make TRACE_IRQFLAGS_NMI_SUPPORT generic

From: Mark Rutland <mark.rutland@....com>

[ 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@....com>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Will Deacon <will@...nel.org>
Link: https://lore.kernel.org/r/20220511131733.4074499-2-mark.rutland@arm.com
Signed-off-by: Will Deacon <will@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/Kconfig           | 3 +++
 arch/x86/Kconfig       | 1 +
 arch/x86/Kconfig.debug | 3 ---
 3 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/Kconfig b/arch/Kconfig
index 191589f26b1a..5987363b41c2 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -200,6 +200,9 @@ config HAVE_NMI
 config TRACE_IRQFLAGS_SUPPORT
 	bool
 
+config TRACE_IRQFLAGS_NMI_SUPPORT
+	bool
+
 #
 # An arch should select this if it provides all these things:
 #
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index fe6981a38795..57f5e881791a 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -260,6 +260,7 @@ config X86
 	select SYSCTL_EXCEPTION_TRACE
 	select THREAD_INFO_IN_TASK
 	select TRACE_IRQFLAGS_SUPPORT
+	select TRACE_IRQFLAGS_NMI_SUPPORT
 	select USER_STACKTRACE_SUPPORT
 	select VIRT_TO_BUS
 	select HAVE_ARCH_KCSAN			if X86_64
diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
index d3a6f74a94bd..d4d6db4dde22 100644
--- a/arch/x86/Kconfig.debug
+++ b/arch/x86/Kconfig.debug
@@ -1,8 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0
 
-config TRACE_IRQFLAGS_NMI_SUPPORT
-	def_bool y
-
 config EARLY_PRINTK_USB
 	bool
 
-- 
2.35.1