[PATCH v2 (RESEND) 1/2] locking/atomics: Fixup GENERIC_ATOMIC64 conflict with atomic-arch-fallback.h

From: guoren
Date: Sat Apr 17 2021 - 00:46:29 EST

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From: Guo Ren <guoren@xxxxxxxxxxxxxxxxx>

Current GENERIC_ATOMIC64 in atomic-arch-fallback.h is broken. When a 32-bit
arch use atomic-arch-fallback.h will cause compile error.

In file included from include/linux/atomic.h:81,
from include/linux/rcupdate.h:25,
from include/linux/rculist.h:11,
from include/linux/pid.h:5,
from include/linux/sched.h:14,
from arch/riscv/kernel/asm-offsets.c:10:
include/linux/atomic-arch-fallback.h: In function 'arch_atomic64_inc':
>> include/linux/atomic-arch-fallback.h:1447:2: error: implicit declaration of function 'arch_atomic64_add'; did you mean 'arch_atomic_add'? [-Werror=implicit-function-declaration]
1447 | arch_atomic64_add(1, v);
| ^~~~~~~~~~~~~~~~~
| arch_atomic_add

The atomic-arch-fallback.h & atomic-fallback.h &
atomic-instrumented.h are generated by gen-atomic-fallback.sh &
gen-atomic-instrumented.sh, so just take care the bash files.

Add atomic64_* wrapper into atomic64.h, then there is no dependency
of atomic-*-fallback.h in atomic64.h.

Change in v2:
- Fixup scripts/atomic/gen-atomic-instrumented.sh wih duplicated
definition export.

Signed-off-by: Guo Ren <guoren@xxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
---
include/asm-generic/atomic-instrumented.h | 264 +++++++++++++++---------------
include/asm-generic/atomic64.h | 89 ++++++++++
include/linux/atomic-arch-fallback.h | 5 +-
include/linux/atomic-fallback.h | 5 +-
scripts/atomic/gen-atomic-fallback.sh | 3 +-
scripts/atomic/gen-atomic-instrumented.sh | 23 ++-
6 files changed, 251 insertions(+), 138 deletions(-)

diff --git a/include/asm-generic/atomic-instrumented.h b/include/asm-generic/atomic-instrumented.h
index 888b6cf..c9e69c6 100644
--- a/include/asm-generic/atomic-instrumented.h
+++ b/include/asm-generic/atomic-instrumented.h
@@ -831,6 +831,137 @@ atomic_dec_if_positive(atomic_t *v)
#define atomic_dec_if_positive atomic_dec_if_positive
#endif

+#if !defined(arch_xchg_relaxed) || defined(arch_xchg)
+#define xchg(ptr, ...) \
+({ \
+ typeof(ptr) __ai_ptr = (ptr); \
+ instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
+ arch_xchg(__ai_ptr, __VA_ARGS__); \
+})
+#endif
+
+#if defined(arch_xchg_acquire)
+#define xchg_acquire(ptr, ...) \
+({ \
+ typeof(ptr) __ai_ptr = (ptr); \
+ instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
+ arch_xchg_acquire(__ai_ptr, __VA_ARGS__); \
+})
+#endif
+
+#if defined(arch_xchg_release)
+#define xchg_release(ptr, ...) \
+({ \
+ typeof(ptr) __ai_ptr = (ptr); \
+ instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
+ arch_xchg_release(__ai_ptr, __VA_ARGS__); \
+})
+#endif
+
+#if defined(arch_xchg_relaxed)
+#define xchg_relaxed(ptr, ...) \
+({ \
+ typeof(ptr) __ai_ptr = (ptr); \
+ instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
+ arch_xchg_relaxed(__ai_ptr, __VA_ARGS__); \
+})
+#endif
+
+#if !defined(arch_cmpxchg_relaxed) || defined(arch_cmpxchg)
+#define cmpxchg(ptr, ...) \
+({ \
+ typeof(ptr) __ai_ptr = (ptr); \
+ instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
+ arch_cmpxchg(__ai_ptr, __VA_ARGS__); \
+})
+#endif
+
+#if defined(arch_cmpxchg_acquire)
+#define cmpxchg_acquire(ptr, ...) \
+({ \
+ typeof(ptr) __ai_ptr = (ptr); \
+ instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
+ arch_cmpxchg_acquire(__ai_ptr, __VA_ARGS__); \
+})
+#endif
+
+#if defined(arch_cmpxchg_release)
+#define cmpxchg_release(ptr, ...) \
+({ \
+ typeof(ptr) __ai_ptr = (ptr); \
+ instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
+ arch_cmpxchg_release(__ai_ptr, __VA_ARGS__); \
+})
+#endif
+
+#if defined(arch_cmpxchg_relaxed)
+#define cmpxchg_relaxed(ptr, ...) \
+({ \
+ typeof(ptr) __ai_ptr = (ptr); \
+ instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
+ arch_cmpxchg_relaxed(__ai_ptr, __VA_ARGS__); \
+})
+#endif
+
+#if !defined(arch_try_cmpxchg_relaxed) || defined(arch_try_cmpxchg)
+#define try_cmpxchg(ptr, oldp, ...) \
+({ \
+ typeof(ptr) __ai_ptr = (ptr); \
+ typeof(oldp) __ai_oldp = (oldp); \
+ instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
+ instrument_atomic_write(__ai_oldp, sizeof(*__ai_oldp)); \
+ arch_try_cmpxchg(__ai_ptr, __ai_oldp, __VA_ARGS__); \
+})
+#endif
+
+#if defined(arch_try_cmpxchg_acquire)
+#define try_cmpxchg_acquire(ptr, oldp, ...) \
+({ \
+ typeof(ptr) __ai_ptr = (ptr); \
+ typeof(oldp) __ai_oldp = (oldp); \
+ instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
+ instrument_atomic_write(__ai_oldp, sizeof(*__ai_oldp)); \
+ arch_try_cmpxchg_acquire(__ai_ptr, __ai_oldp, __VA_ARGS__); \
+})
+#endif
+
+#if defined(arch_try_cmpxchg_release)
+#define try_cmpxchg_release(ptr, oldp, ...) \
+({ \
+ typeof(ptr) __ai_ptr = (ptr); \
+ typeof(oldp) __ai_oldp = (oldp); \
+ instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
+ instrument_atomic_write(__ai_oldp, sizeof(*__ai_oldp)); \
+ arch_try_cmpxchg_release(__ai_ptr, __ai_oldp, __VA_ARGS__); \
+})
+#endif
+
+#if defined(arch_try_cmpxchg_relaxed)
+#define try_cmpxchg_relaxed(ptr, oldp, ...) \
+({ \
+ typeof(ptr) __ai_ptr = (ptr); \
+ typeof(oldp) __ai_oldp = (oldp); \
+ instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
+ instrument_atomic_write(__ai_oldp, sizeof(*__ai_oldp)); \
+ arch_try_cmpxchg_relaxed(__ai_ptr, __ai_oldp, __VA_ARGS__); \
+})
+#endif
+
+#define cmpxchg_local(ptr, ...) \
+({ \
+ typeof(ptr) __ai_ptr = (ptr); \
+ instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
+ arch_cmpxchg_local(__ai_ptr, __VA_ARGS__); \
+})
+
+#define sync_cmpxchg(ptr, ...) \
+({ \
+ typeof(ptr) __ai_ptr = (ptr); \
+ instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
+ arch_sync_cmpxchg(__ai_ptr, __VA_ARGS__); \
+})
+
+#ifndef CONFIG_GENERIC_ATOMIC64
static __always_inline s64
atomic64_read(const atomic64_t *v)
{
@@ -1641,78 +1772,6 @@ atomic64_dec_if_positive(atomic64_t *v)
#define atomic64_dec_if_positive atomic64_dec_if_positive
#endif

-#if !defined(arch_xchg_relaxed) || defined(arch_xchg)
-#define xchg(ptr, ...) \
-({ \
- typeof(ptr) __ai_ptr = (ptr); \
- instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
- arch_xchg(__ai_ptr, __VA_ARGS__); \
-})
-#endif
-
-#if defined(arch_xchg_acquire)
-#define xchg_acquire(ptr, ...) \
-({ \
- typeof(ptr) __ai_ptr = (ptr); \
- instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
- arch_xchg_acquire(__ai_ptr, __VA_ARGS__); \
-})
-#endif
-
-#if defined(arch_xchg_release)
-#define xchg_release(ptr, ...) \
-({ \
- typeof(ptr) __ai_ptr = (ptr); \
- instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
- arch_xchg_release(__ai_ptr, __VA_ARGS__); \
-})
-#endif
-
-#if defined(arch_xchg_relaxed)
-#define xchg_relaxed(ptr, ...) \
-({ \
- typeof(ptr) __ai_ptr = (ptr); \
- instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
- arch_xchg_relaxed(__ai_ptr, __VA_ARGS__); \
-})
-#endif
-
-#if !defined(arch_cmpxchg_relaxed) || defined(arch_cmpxchg)
-#define cmpxchg(ptr, ...) \
-({ \
- typeof(ptr) __ai_ptr = (ptr); \
- instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
- arch_cmpxchg(__ai_ptr, __VA_ARGS__); \
-})
-#endif
-
-#if defined(arch_cmpxchg_acquire)
-#define cmpxchg_acquire(ptr, ...) \
-({ \
- typeof(ptr) __ai_ptr = (ptr); \
- instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
- arch_cmpxchg_acquire(__ai_ptr, __VA_ARGS__); \
-})
-#endif
-
-#if defined(arch_cmpxchg_release)
-#define cmpxchg_release(ptr, ...) \
-({ \
- typeof(ptr) __ai_ptr = (ptr); \
- instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
- arch_cmpxchg_release(__ai_ptr, __VA_ARGS__); \
-})
-#endif
-
-#if defined(arch_cmpxchg_relaxed)
-#define cmpxchg_relaxed(ptr, ...) \
-({ \
- typeof(ptr) __ai_ptr = (ptr); \
- instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
- arch_cmpxchg_relaxed(__ai_ptr, __VA_ARGS__); \
-})
-#endif
-
#if !defined(arch_cmpxchg64_relaxed) || defined(arch_cmpxchg64)
#define cmpxchg64(ptr, ...) \
({ \
@@ -1749,57 +1808,6 @@ atomic64_dec_if_positive(atomic64_t *v)
})
#endif

-#if !defined(arch_try_cmpxchg_relaxed) || defined(arch_try_cmpxchg)
-#define try_cmpxchg(ptr, oldp, ...) \
-({ \
- typeof(ptr) __ai_ptr = (ptr); \
- typeof(oldp) __ai_oldp = (oldp); \
- instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
- instrument_atomic_write(__ai_oldp, sizeof(*__ai_oldp)); \
- arch_try_cmpxchg(__ai_ptr, __ai_oldp, __VA_ARGS__); \
-})
-#endif
-
-#if defined(arch_try_cmpxchg_acquire)
-#define try_cmpxchg_acquire(ptr, oldp, ...) \
-({ \
- typeof(ptr) __ai_ptr = (ptr); \
- typeof(oldp) __ai_oldp = (oldp); \
- instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
- instrument_atomic_write(__ai_oldp, sizeof(*__ai_oldp)); \
- arch_try_cmpxchg_acquire(__ai_ptr, __ai_oldp, __VA_ARGS__); \
-})
-#endif
-
-#if defined(arch_try_cmpxchg_release)
-#define try_cmpxchg_release(ptr, oldp, ...) \
-({ \
- typeof(ptr) __ai_ptr = (ptr); \
- typeof(oldp) __ai_oldp = (oldp); \
- instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
- instrument_atomic_write(__ai_oldp, sizeof(*__ai_oldp)); \
- arch_try_cmpxchg_release(__ai_ptr, __ai_oldp, __VA_ARGS__); \
-})
-#endif
-
-#if defined(arch_try_cmpxchg_relaxed)
-#define try_cmpxchg_relaxed(ptr, oldp, ...) \
-({ \
- typeof(ptr) __ai_ptr = (ptr); \
- typeof(oldp) __ai_oldp = (oldp); \
- instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
- instrument_atomic_write(__ai_oldp, sizeof(*__ai_oldp)); \
- arch_try_cmpxchg_relaxed(__ai_ptr, __ai_oldp, __VA_ARGS__); \
-})
-#endif
-
-#define cmpxchg_local(ptr, ...) \
-({ \
- typeof(ptr) __ai_ptr = (ptr); \
- instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
- arch_cmpxchg_local(__ai_ptr, __VA_ARGS__); \
-})
-
#define cmpxchg64_local(ptr, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
@@ -1807,13 +1815,7 @@ atomic64_dec_if_positive(atomic64_t *v)
arch_cmpxchg64_local(__ai_ptr, __VA_ARGS__); \
})

-#define sync_cmpxchg(ptr, ...) \
-({ \
- typeof(ptr) __ai_ptr = (ptr); \
- instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
- arch_sync_cmpxchg(__ai_ptr, __VA_ARGS__); \
-})
-
+#endif
#define cmpxchg_double(ptr, ...) \
({ \
typeof(ptr) __ai_ptr = (ptr); \
@@ -1830,4 +1832,4 @@ atomic64_dec_if_positive(atomic64_t *v)
})

#endif /* _ASM_GENERIC_ATOMIC_INSTRUMENTED_H */
-// 4bec382e44520f4d8267e42620054db26a659ea3
+// 21c7f7e074cb2cb7e2f593fe7c8f6dec6ab9e7ea
diff --git a/include/asm-generic/atomic64.h b/include/asm-generic/atomic64.h
index 370f01d..bb5cf1e 100644
--- a/include/asm-generic/atomic64.h
+++ b/include/asm-generic/atomic64.h
@@ -34,6 +34,18 @@ extern s64 atomic64_fetch_##op(s64 a, atomic64_t *v);
ATOMIC64_OPS(add)
ATOMIC64_OPS(sub)

+#define atomic64_add_relaxed atomic64_add
+#define atomic64_add_acquire atomic64_add
+#define atomic64_add_release atomic64_add
+
+#define atomic64_add_return_relaxed atomic64_add_return
+#define atomic64_add_return_acquire atomic64_add_return
+#define atomic64_add_return_release atomic64_add_return
+
+#define atomic64_fetch_add_relaxed atomic64_fetch_add
+#define atomic64_fetch_add_acquire atomic64_fetch_add
+#define atomic64_fetch_add_release atomic64_fetch_add
+
#undef ATOMIC64_OPS
#define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_FETCH_OP(op)

@@ -49,8 +61,85 @@ ATOMIC64_OPS(xor)
extern s64 atomic64_dec_if_positive(atomic64_t *v);
#define atomic64_dec_if_positive atomic64_dec_if_positive
extern s64 atomic64_cmpxchg(atomic64_t *v, s64 o, s64 n);
+#define atomic64_cmpxchg_relaxed atomic64_cmpxchg
+#define atomic64_cmpxchg_acquire atomic64_cmpxchg
+#define atomic64_cmpxchg_release atomic64_cmpxchg
extern s64 atomic64_xchg(atomic64_t *v, s64 new);
+#define atomic64_xchg_relaxed atomic64_xchg
+#define atomic64_xchg_acquire atomic64_xchg
+#define atomic64_xchg_release atomic64_xchg
extern s64 atomic64_fetch_add_unless(atomic64_t *v, s64 a, s64 u);
#define atomic64_fetch_add_unless atomic64_fetch_add_unless

+static __always_inline void
+atomic64_inc(atomic64_t *v)
+{
+ atomic64_add(1, v);
+}
+
+static __always_inline s64
+atomic64_inc_return(atomic64_t *v)
+{
+ return atomic64_add_return(1, v);
+}
+
+static __always_inline s64
+atomic64_fetch_inc(atomic64_t *v)
+{
+ return atomic64_fetch_add(1, v);
+}
+
+static __always_inline void
+atomic64_dec(atomic64_t *v)
+{
+ atomic64_sub(1, v);
+}
+
+static __always_inline s64
+atomic64_dec_return(atomic64_t *v)
+{
+ return atomic64_sub_return(1, v);
+}
+
+static __always_inline s64
+atomic64_fetch_dec(atomic64_t *v)
+{
+ return atomic64_fetch_sub(1, v);
+}
+
+static __always_inline void
+atomic64_andnot(s64 i, atomic64_t *v)
+{
+ atomic64_and(~i, v);
+}
+
+static __always_inline s64
+atomic64_fetch_andnot(s64 i, atomic64_t *v)
+{
+ return atomic64_fetch_and(~i, v);
+}
+
+static __always_inline bool
+atomic64_sub_and_test(int i, atomic64_t *v)
+{
+ return atomic64_sub_return(i, v) == 0;
+}
+
+static __always_inline bool
+atomic64_dec_and_test(atomic64_t *v)
+{
+ return atomic64_dec_return(v) == 0;
+}
+
+static __always_inline bool
+atomic64_inc_and_test(atomic64_t *v)
+{
+ return atomic64_inc_return(v) == 0;
+}
+
+static __always_inline bool
+atomic64_add_negative(s64 i, atomic64_t *v)
+{
+ return atomic64_add_return(i, v) < 0;
+}
#endif /* _ASM_GENERIC_ATOMIC64_H */
diff --git a/include/linux/atomic-arch-fallback.h b/include/linux/atomic-arch-fallback.h
index a3dba31..2f1db6a 100644
--- a/include/linux/atomic-arch-fallback.h
+++ b/include/linux/atomic-arch-fallback.h
@@ -1252,7 +1252,7 @@ arch_atomic_dec_if_positive(atomic_t *v)

#ifdef CONFIG_GENERIC_ATOMIC64
#include <asm-generic/atomic64.h>
-#endif
+#else

#ifndef arch_atomic64_read_acquire
static __always_inline s64
@@ -2357,5 +2357,6 @@ arch_atomic64_dec_if_positive(atomic64_t *v)
#define arch_atomic64_dec_if_positive arch_atomic64_dec_if_positive
#endif

+#endif /* CONFIG_GENERIC_ATOMIC64 */
#endif /* _LINUX_ATOMIC_FALLBACK_H */
-// cca554917d7ea73d5e3e7397dd70c484cad9b2c4
+// ae31a21075855e67a9b2927f8241dedddafda046
diff --git a/include/linux/atomic-fallback.h b/include/linux/atomic-fallback.h
index 2a3f55d..7dda483 100644
--- a/include/linux/atomic-fallback.h
+++ b/include/linux/atomic-fallback.h
@@ -1369,7 +1369,7 @@ atomic_dec_if_positive(atomic_t *v)

#ifdef CONFIG_GENERIC_ATOMIC64
#include <asm-generic/atomic64.h>
-#endif
+#else

#define arch_atomic64_read atomic64_read
#define arch_atomic64_read_acquire atomic64_read_acquire
@@ -2591,5 +2591,6 @@ atomic64_dec_if_positive(atomic64_t *v)
#define atomic64_dec_if_positive atomic64_dec_if_positive
#endif

+#endif /* CONFIG_GENERIC_ATOMIC64 */
#endif /* _LINUX_ATOMIC_FALLBACK_H */
-// d78e6c293c661c15188f0ec05bce45188c8d5892
+// b809c8e3c88910826f765bdba4a74f21c527029d
diff --git a/scripts/atomic/gen-atomic-fallback.sh b/scripts/atomic/gen-atomic-fallback.sh
index 317a6ce..8b7a685 100755
--- a/scripts/atomic/gen-atomic-fallback.sh
+++ b/scripts/atomic/gen-atomic-fallback.sh
@@ -247,7 +247,7 @@ done
cat <<EOF
#ifdef CONFIG_GENERIC_ATOMIC64
#include <asm-generic/atomic64.h>
-#endif
+#else

EOF

@@ -256,5 +256,6 @@ grep '^[a-z]' "$1" | while read name meta args; do
done

cat <<EOF
+#endif /* CONFIG_GENERIC_ATOMIC64 */
#endif /* _LINUX_ATOMIC_FALLBACK_H */
EOF
diff --git a/scripts/atomic/gen-atomic-instrumented.sh b/scripts/atomic/gen-atomic-instrumented.sh
index 5766ffc..1f2a58b 100755
--- a/scripts/atomic/gen-atomic-instrumented.sh
+++ b/scripts/atomic/gen-atomic-instrumented.sh
@@ -182,21 +182,40 @@ grep '^[a-z]' "$1" | while read name meta args; do
gen_proto "${meta}" "${name}" "atomic" "int" ${args}
done

+for xchg in "xchg" "cmpxchg" "try_cmpxchg"; do
+ for order in "" "_acquire" "_release" "_relaxed"; do
+ gen_optional_xchg "${xchg}" "${order}"
+ done
+done
+
+for xchg in "cmpxchg_local" "sync_cmpxchg"; do
+ gen_xchg "${xchg}" ""
+ printf "\n"
+done
+
+cat <<EOF
+#ifndef CONFIG_GENERIC_ATOMIC64
+EOF
+
grep '^[a-z]' "$1" | while read name meta args; do
gen_proto "${meta}" "${name}" "atomic64" "s64" ${args}
done

-for xchg in "xchg" "cmpxchg" "cmpxchg64" "try_cmpxchg"; do
+for xchg in "cmpxchg64"; do
for order in "" "_acquire" "_release" "_relaxed"; do
gen_optional_xchg "${xchg}" "${order}"
done
done

-for xchg in "cmpxchg_local" "cmpxchg64_local" "sync_cmpxchg"; do
+for xchg in "cmpxchg64_local"; do
gen_xchg "${xchg}" ""
printf "\n"
done

+cat <<EOF
+#endif
+EOF
+
gen_xchg "cmpxchg_double" "2 * "

printf "\n\n"
--
2.7.4

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