linux-kernel - [GIT PULL] locking fixes

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Message-ID: <ZQ1odhFD+Kz1Eutj@gmail.com>
Date:   Fri, 22 Sep 2023 12:12:06 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will@...nel.org>,
        Waiman Long <longman@...hat.com>,
        Boqun Feng <boqun.feng@...il.com>
Subject: [GIT PULL] locking fixes


Linus,

Please pull the latest locking/urgent git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git locking-urgent-2023-09-22

   # HEAD: 41b43b6c6e30a832c790b010a06772e793bca193 locking/seqlock: Do the lockdep annotation before locking in do_write_seqcount_begin_nested()

Fix a include/linux/atomic/atomic-arch-fallback.h breakage that generated
incorrect code, and fix a lockdep reporting race that may result in lockups.

 Thanks,

	Ingo

------------------>
Mark Rutland (1):
      locking/atomic: scripts: fix fallback ifdeffery

Sebastian Andrzej Siewior (1):
      locking/seqlock: Do the lockdep annotation before locking in do_write_seqcount_begin_nested()


 include/linux/atomic/atomic-arch-fallback.h | 10 +---------
 include/linux/seqlock.h                     |  2 +-
 scripts/atomic/gen-atomic-fallback.sh       |  2 +-
 3 files changed, 3 insertions(+), 11 deletions(-)

diff --git a/include/linux/atomic/atomic-arch-fallback.h b/include/linux/atomic/atomic-arch-fallback.h
index 18f5744dfb5d..b83ef19da13d 100644
--- a/include/linux/atomic/atomic-arch-fallback.h
+++ b/include/linux/atomic/atomic-arch-fallback.h
@@ -459,8 +459,6 @@ raw_atomic_read_acquire(const atomic_t *v)
 {
 #if defined(arch_atomic_read_acquire)
 	return arch_atomic_read_acquire(v);
-#elif defined(arch_atomic_read)
-	return arch_atomic_read(v);
 #else
 	int ret;
 
@@ -508,8 +506,6 @@ raw_atomic_set_release(atomic_t *v, int i)
 {
 #if defined(arch_atomic_set_release)
 	arch_atomic_set_release(v, i);
-#elif defined(arch_atomic_set)
-	arch_atomic_set(v, i);
 #else
 	if (__native_word(atomic_t)) {
 		smp_store_release(&(v)->counter, i);
@@ -2575,8 +2571,6 @@ raw_atomic64_read_acquire(const atomic64_t *v)
 {
 #if defined(arch_atomic64_read_acquire)
 	return arch_atomic64_read_acquire(v);
-#elif defined(arch_atomic64_read)
-	return arch_atomic64_read(v);
 #else
 	s64 ret;
 
@@ -2624,8 +2618,6 @@ raw_atomic64_set_release(atomic64_t *v, s64 i)
 {
 #if defined(arch_atomic64_set_release)
 	arch_atomic64_set_release(v, i);
-#elif defined(arch_atomic64_set)
-	arch_atomic64_set(v, i);
 #else
 	if (__native_word(atomic64_t)) {
 		smp_store_release(&(v)->counter, i);
@@ -4657,4 +4649,4 @@ raw_atomic64_dec_if_positive(atomic64_t *v)
 }
 
 #endif /* _LINUX_ATOMIC_FALLBACK_H */
-// 202b45c7db600ce36198eb1f1fc2c2d5268ace2d
+// 2fdd6702823fa842f9cea57a002e6e4476ae780c
diff --git a/include/linux/seqlock.h b/include/linux/seqlock.h
index 987a59d977c5..e9bd2f65d7f4 100644
--- a/include/linux/seqlock.h
+++ b/include/linux/seqlock.h
@@ -512,8 +512,8 @@ do {									\
 
 static inline void do_write_seqcount_begin_nested(seqcount_t *s, int subclass)
 {
-	do_raw_write_seqcount_begin(s);
 	seqcount_acquire(&s->dep_map, subclass, 0, _RET_IP_);
+	do_raw_write_seqcount_begin(s);
 }
 
 /**
diff --git a/scripts/atomic/gen-atomic-fallback.sh b/scripts/atomic/gen-atomic-fallback.sh
index c0c8a85d7c81..a45154cefa48 100755
--- a/scripts/atomic/gen-atomic-fallback.sh
+++ b/scripts/atomic/gen-atomic-fallback.sh
@@ -102,7 +102,7 @@ gen_proto_order_variant()
 	fi
 
 	# Allow ACQUIRE/RELEASE/RELAXED ops to be defined in terms of FULL ops
-	if [ ! -z "${order}" ]; then
+	if [ ! -z "${order}" ] && ! meta_is_implicitly_relaxed "${meta}"; then
 		printf "#elif defined(arch_${basename})\n"
 		printf "\t${retstmt}arch_${basename}(${args});\n"
 	fi