linux-kernel - [PATCH v2 2/3] list_debug: Introduce inline wrappers for debug checks

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Message-ID: <20230804090621.400-2-elver@google.com>
Date:   Fri,  4 Aug 2023 11:02:57 +0200
From:   Marco Elver <elver@...gle.com>
To:     elver@...gle.com, Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        Peter Zijlstra <peterz@...radead.org>,
        Mark Rutland <mark.rutland@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Marc Zyngier <maz@...nel.org>,
        Oliver Upton <oliver.upton@...ux.dev>,
        James Morse <james.morse@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Zenghui Yu <yuzenghui@...wei.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, Miguel Ojeda <ojeda@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        kasan-dev@...glegroups.com, linux-toolchains@...r.kernel.org
Subject: [PATCH v2 2/3] list_debug: Introduce inline wrappers for debug checks

Turn the list debug checking functions __list_*_valid() into inline
functions that wrap the out-of-line functions. Care is taken to ensure
the inline wrappers are always inlined, so that additional compiler
instrumentation (such as sanitizers) does not result in redundant
outlining.

This change is preparation for performing checks in the inline wrappers.

No functional change intended.

Signed-off-by: Marco Elver <elver@...gle.com>
---
 arch/arm64/kvm/hyp/nvhe/list_debug.c |  6 +++---
 include/linux/list.h                 | 15 +++++++++++++--
 lib/list_debug.c                     | 11 +++++------
 3 files changed, 21 insertions(+), 11 deletions(-)

diff --git a/arch/arm64/kvm/hyp/nvhe/list_debug.c b/arch/arm64/kvm/hyp/nvhe/list_debug.c
index d68abd7ea124..589284496ac5 100644
--- a/arch/arm64/kvm/hyp/nvhe/list_debug.c
+++ b/arch/arm64/kvm/hyp/nvhe/list_debug.c
@@ -26,8 +26,8 @@ static inline __must_check bool nvhe_check_data_corruption(bool v)
 
 /* The predicates checked here are taken from lib/list_debug.c. */
 
-bool __list_add_valid(struct list_head *new, struct list_head *prev,
-		      struct list_head *next)
+bool ___list_add_valid(struct list_head *new, struct list_head *prev,
+		       struct list_head *next)
 {
 	if (NVHE_CHECK_DATA_CORRUPTION(next->prev != prev) ||
 	    NVHE_CHECK_DATA_CORRUPTION(prev->next != next) ||
@@ -37,7 +37,7 @@ bool __list_add_valid(struct list_head *new, struct list_head *prev,
 	return true;
 }
 
-bool __list_del_entry_valid(struct list_head *entry)
+bool ___list_del_entry_valid(struct list_head *entry)
 {
 	struct list_head *prev, *next;
 
diff --git a/include/linux/list.h b/include/linux/list.h
index f10344dbad4d..e0b2cf904409 100644
--- a/include/linux/list.h
+++ b/include/linux/list.h
@@ -39,10 +39,21 @@ static inline void INIT_LIST_HEAD(struct list_head *list)
 }
 
 #ifdef CONFIG_DEBUG_LIST
-extern bool __list_add_valid(struct list_head *new,
+extern bool ___list_add_valid(struct list_head *new,
 			      struct list_head *prev,
 			      struct list_head *next);
-extern bool __list_del_entry_valid(struct list_head *entry);
+static __always_inline bool __list_add_valid(struct list_head *new,
+					     struct list_head *prev,
+					     struct list_head *next)
+{
+	return ___list_add_valid(new, prev, next);
+}
+
+extern bool ___list_del_entry_valid(struct list_head *entry);
+static __always_inline bool __list_del_entry_valid(struct list_head *entry)
+{
+	return ___list_del_entry_valid(entry);
+}
 #else
 static inline bool __list_add_valid(struct list_head *new,
 				struct list_head *prev,
diff --git a/lib/list_debug.c b/lib/list_debug.c
index d98d43f80958..fd69009cc696 100644
--- a/lib/list_debug.c
+++ b/lib/list_debug.c
@@ -17,8 +17,8 @@
  * attempt).
  */
 
-bool __list_add_valid(struct list_head *new, struct list_head *prev,
-		      struct list_head *next)
+bool ___list_add_valid(struct list_head *new, struct list_head *prev,
+		       struct list_head *next)
 {
 	if (CHECK_DATA_CORRUPTION(prev == NULL,
 			"list_add corruption. prev is NULL.\n") ||
@@ -37,9 +37,9 @@ bool __list_add_valid(struct list_head *new, struct list_head *prev,
 
 	return true;
 }
-EXPORT_SYMBOL(__list_add_valid);
+EXPORT_SYMBOL(___list_add_valid);
 
-bool __list_del_entry_valid(struct list_head *entry)
+bool ___list_del_entry_valid(struct list_head *entry)
 {
 	struct list_head *prev, *next;
 
@@ -65,6 +65,5 @@ bool __list_del_entry_valid(struct list_head *entry)
 		return false;
 
 	return true;
-
 }
-EXPORT_SYMBOL(__list_del_entry_valid);
+EXPORT_SYMBOL(___list_del_entry_valid);
-- 
2.41.0.640.ga95def55d0-goog