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selftests/rseq: fix kselftest Clang build warnings

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When building with Clang, I am getting many warnings from the selftests/rseq tree.

Here's one such example from rseq tree:
|  param_test.c🔢10: error: address argument to atomic operation must be a pointer to _Atomic type ('intptr_t *' (aka 'long *') invalid)
|   1234 |         while (!atomic_load(&args->percpu_list_ptr)) {}
|        |                 ^           ~~~~~~~~~~~~~~~~~~~~~~
|  /usr/local/google/home/justinstitt/repos/tc-build/build/llvm/final/lib/clang/18/include/stdatomic.h:140:29: note: expanded from macro 'atomic_load'
|    140 | #define atomic_load(object) __c11_atomic_load(object, __ATOMIC_SEQ_CST)
|        |                             ^                 ~~~~~~

Use compiler builtins `__atomic_load_n()` and `__atomic_store_n()` with
accompanying __ATOMIC_ACQUIRE and __ATOMIC_RELEASE, respectively. This
will fix the warnings because the compiler builtins do not expect their
arguments to have _Atomic type. This should also make TSAN happier.

Link: https://github.com/ClangBuiltLinux/linux/issues/1698
Link: https://github.com/ClangBuiltLinux/continuous-integration2/issues/61
Suggested-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Justin Stitt <justinstitt@google.com>
Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
This commit is contained in:
Justin Stitt 2023-09-12 21:03:50 +00:00 committed by Shuah Khan
parent 18378b0e49
commit 078a2ead54
1 changed files with 10 additions and 10 deletions
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20
tools/testing/selftests/rseq/param_test.c
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@ -1231,7 +1231,7 @@ void *test_membarrier_worker_thread(void *arg)
}
/* Wait for initialization. */
while (!atomic_load(&args->percpu_list_ptr)) {}
while (!__atomic_load_n(&args->percpu_list_ptr, __ATOMIC_ACQUIRE)) {}
for (i = 0; i < iters; ++i) {
int ret;
@ -1299,22 +1299,22 @@ void *test_membarrier_manager_thread(void *arg)
test_membarrier_init_percpu_list(&list_a);
test_membarrier_init_percpu_list(&list_b);
atomic_store(&args->percpu_list_ptr, (intptr_t)&list_a);
__atomic_store_n(&args->percpu_list_ptr, (intptr_t)&list_a, __ATOMIC_RELEASE);
while (!atomic_load(&args->stop)) {
while (!__atomic_load_n(&args->stop, __ATOMIC_ACQUIRE)) {
/* list_a is "active". */
cpu_a = rand() % CPU_SETSIZE;
/*
* As list_b is "inactive", we should never see changes
* to list_b.
*/
if (expect_b != atomic_load(&list_b.c[cpu_b].head->data)) {
if (expect_b != __atomic_load_n(&list_b.c[cpu_b].head->data, __ATOMIC_ACQUIRE)) {
fprintf(stderr, "Membarrier test failed\n");
abort();
}
/* Make list_b "active". */
atomic_store(&args->percpu_list_ptr, (intptr_t)&list_b);
__atomic_store_n(&args->percpu_list_ptr, (intptr_t)&list_b, __ATOMIC_RELEASE);
if (rseq_membarrier_expedited(cpu_a) &&
errno != ENXIO /* missing CPU */) {
perror("sys_membarrier");
@ -1324,27 +1324,27 @@ void *test_membarrier_manager_thread(void *arg)
* Cpu A should now only modify list_b, so the values
* in list_a should be stable.
*/
expect_a = atomic_load(&list_a.c[cpu_a].head->data);
expect_a = __atomic_load_n(&list_a.c[cpu_a].head->data, __ATOMIC_ACQUIRE);
cpu_b = rand() % CPU_SETSIZE;
/*
* As list_a is "inactive", we should never see changes
* to list_a.
*/
if (expect_a != atomic_load(&list_a.c[cpu_a].head->data)) {
if (expect_a != __atomic_load_n(&list_a.c[cpu_a].head->data, __ATOMIC_ACQUIRE)) {
fprintf(stderr, "Membarrier test failed\n");
abort();
}
/* Make list_a "active". */
atomic_store(&args->percpu_list_ptr, (intptr_t)&list_a);
__atomic_store_n(&args->percpu_list_ptr, (intptr_t)&list_a, __ATOMIC_RELEASE);
if (rseq_membarrier_expedited(cpu_b) &&
errno != ENXIO /* missing CPU*/) {
perror("sys_membarrier");
abort();
}
/* Remember a value from list_b. */
expect_b = atomic_load(&list_b.c[cpu_b].head->data);
expect_b = __atomic_load_n(&list_b.c[cpu_b].head->data, __ATOMIC_ACQUIRE);
}
test_membarrier_free_percpu_list(&list_a);
@ -1401,7 +1401,7 @@ void test_membarrier(void)
}
}
atomic_store(&thread_args.stop, 1);
__atomic_store_n(&thread_args.stop, 1, __ATOMIC_RELEASE);
ret = pthread_join(manager_thread, NULL);
if (ret) {
errno = ret;