linux-kernel - [PATCH v4 6/9] entry: Make CONFIG_DEBUG

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Message-Id: <958da625d20756dc37935685e5afe45a1313286c.1616004689.git.luto@kernel.org>
Date:   Wed, 17 Mar 2021 11:12:45 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     x86@...nel.org
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        Brian Gerst <brgerst@...il.com>,
        Andy Lutomirski <luto@...nel.org>
Subject: [PATCH v4 6/9] entry: Make CONFIG_DEBUG_ENTRY available outside x86

In principle, the generic entry code is generic, and the goal is to use it
in many architectures once it settles down more.  Move CONFIG_DEBUG_ENTRY
to the generic config so that it can be used in the generic entry code and
not just in arch/x86.

This currently depends on GENERIC_ENTRY.  If an architecture wants to use
DEBUG_ENTRY without using GENERIC_ENTRY, this could be changed.

Signed-off-by: Andy Lutomirski <luto@...nel.org>
---
 arch/x86/Kconfig.debug | 10 ----------
 lib/Kconfig.debug      | 11 +++++++++++
 2 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
index 80b57e7f4947..a5a52133730c 100644
--- a/arch/x86/Kconfig.debug
+++ b/arch/x86/Kconfig.debug
@@ -170,16 +170,6 @@ config CPA_DEBUG
 	help
 	  Do change_page_attr() self-tests every 30 seconds.
 
-config DEBUG_ENTRY
-	bool "Debug low-level entry code"
-	depends on DEBUG_KERNEL
-	help
-	  This option enables sanity checks in x86's low-level entry code.
-	  Some of these sanity checks may slow down kernel entries and
-	  exits or otherwise impact performance.
-
-	  If unsure, say N.
-
 config DEBUG_NMI_SELFTEST
 	bool "NMI Selftest"
 	depends on DEBUG_KERNEL && X86_LOCAL_APIC
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 7937265ef879..927d913fd471 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1411,6 +1411,17 @@ config CSD_LOCK_WAIT_DEBUG
 
 endmenu # lock debugging
 
+config DEBUG_ENTRY
+	bool "Debug low-level entry code"
+	depends on DEBUG_KERNEL
+	depends on GENERIC_ENTRY
+	help
+	  This option enables sanity checks in the low-level entry code.
+	  Some of these sanity checks may slow down kernel entries and
+	  exits or otherwise impact performance.
+
+	  If unsure, say N.
+
 config TRACE_IRQFLAGS
 	depends on TRACE_IRQFLAGS_SUPPORT
 	bool
-- 
2.30.2