linux-kernel - [PATCH V3] locking/atomic: scripts: Exclude arch_atomic(64)

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Date:   Sat, 25 Nov 2023 20:39:21 -0500
From:   guoren@...nel.org
To:     mark.rutland@....com, peterz@...radead.org, keescook@...omium.org,
        paulmck@...nel.org, ubizjak@...il.com, tglx@...utronix.de
Cc:     linux-kernel@...r.kernel.org, Guo Ren <guoren@...ux.alibaba.com>,
        Guo Ren <guoren@...nel.org>
Subject: [PATCH V3] locking/atomic: scripts: Exclude arch_atomic(64)_read(set) mappings

From: Guo Ren <guoren@...ux.alibaba.com>

The definitions of atomic(64)_read(set) are relax version, and using
them for acquire and release is incorrect, so exclude these mappings.

Signed-off-by: Guo Ren <guoren@...ux.alibaba.com>
Signed-off-by: Guo Ren <guoren@...nel.org>
---
Changelog:
v3:
 - Minimize modification on atomic(64)_read(set)

v2:
 - Use gen-atomic-fallback.sh instead of header modification
---
 include/linux/atomic/atomic-arch-fallback.h | 10 +---------
 scripts/atomic/gen-atomic-fallback.sh       |  3 ++-
 2 files changed, 3 insertions(+), 10 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/scripts/atomic/gen-atomic-fallback.sh b/scripts/atomic/gen-atomic-fallback.sh
index c0c8a85d7c81..282a1d3c41d4 100755
--- a/scripts/atomic/gen-atomic-fallback.sh
+++ b/scripts/atomic/gen-atomic-fallback.sh
@@ -102,7 +102,8 @@ gen_proto_order_variant()
 	fi
 
 	# Allow ACQUIRE/RELEASE/RELAXED ops to be defined in terms of FULL ops
-	if [ ! -z "${order}" ]; then
+	# Exclude arch_atomic(64)_read(set) mappings because these are not FULL ops.
+	if [ ! -z "${order}" ] && [ "${name}" != "read" ] && [ "${name}" != "set" ]; then
 		printf "#elif defined(arch_${basename})\n"
 		printf "\t${retstmt}arch_${basename}(${args});\n"
 	fi
-- 
2.36.1