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selftests/rseq: Do not skip !allowed_cpus for mm_cid

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Indexing with mm_cid is incompatible with skipping disallowed cpumask,
because concurrency IDs are based on a virtual ID allocation which is
unrelated to the physical CPU mask.

These issues can be reproduced by running the rseq selftests under a
taskset which excludes CPU 0, e.g.

  taskset -c 10-20 ./run_param_test.sh

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: "Paul E. McKenney" <paulmck@kernel.org>
Cc: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
This commit is contained in:
Mathieu Desnoyers
2024-01-11 10:49:22 -05:00
committed by Shuah Khan
parent 6613476e22
commit d53271c059
2 changed files with 28 additions and 8 deletions
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14
tools/testing/selftests/rseq/basic_percpu_ops_test.c
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@@ -24,6 +24,11 @@ bool rseq_validate_cpu_id(void)
{
return rseq_mm_cid_available();
}
static
bool rseq_use_cpu_index(void)
{
return false; /* Use mm_cid */
}
#else
# define RSEQ_PERCPU RSEQ_PERCPU_CPU_ID
static
@@ -36,6 +41,11 @@ bool rseq_validate_cpu_id(void)
{
return rseq_current_cpu_raw() >= 0;
}
static
bool rseq_use_cpu_index(void)
{
return true; /* Use cpu_id as index. */
}
#endif
struct percpu_lock_entry {
@@ -274,7 +284,7 @@ void test_percpu_list(void)
/* Generate list entries for every usable cpu. */
sched_getaffinity(0, sizeof(allowed_cpus), &allowed_cpus);
for (i = 0; i < CPU_SETSIZE; i++) {
if (!CPU_ISSET(i, &allowed_cpus))
if (rseq_use_cpu_index() && !CPU_ISSET(i, &allowed_cpus))
continue;
for (j = 1; j <= 100; j++) {
struct percpu_list_node *node;
@@ -299,7 +309,7 @@ void test_percpu_list(void)
for (i = 0; i < CPU_SETSIZE; i++) {
struct percpu_list_node *node;
if (!CPU_ISSET(i, &allowed_cpus))
if (rseq_use_cpu_index() && !CPU_ISSET(i, &allowed_cpus))
continue;
while ((node = __percpu_list_pop(&list, i))) {