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| author | Arnd Bergmann <arnd@arndb.de> | 2025-06-20 13:12:12 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-08-15 12:05:02 +0200 |
| commit | 0425e67b95432f5bb575e7796a6f8420a425b35b (patch) | |
| tree | 27d975e94ca816f66861f5f29fb88fcf0807a1ad /kernel | |
| parent | 9deb3cceaf436155923ff2ae4c938132c0690bdf (diff) | |
| download | linux-0425e67b95432f5bb575e7796a6f8420a425b35b.tar.gz linux-0425e67b95432f5bb575e7796a6f8420a425b35b.tar.bz2 linux-0425e67b95432f5bb575e7796a6f8420a425b35b.zip | |
kernel: trace: preemptirq_delay_test: use offstack cpu mask
[ Upstream commit adc353c0bfb243ebfd29b6222fa3bf149169a6de ]
A CPU mask on the stack is broken for large values of CONFIG_NR_CPUS:
kernel/trace/preemptirq_delay_test.c: In function ‘preemptirq_delay_run’:
kernel/trace/preemptirq_delay_test.c:143:1: error: the frame size of 8512 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]
Fall back to dynamic allocation here.
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Song Chen <chensong_2000@189.cn>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Link: https://lore.kernel.org/20250620111215.3365305-1-arnd@kernel.org
Fixes: 4b9091e1c194 ("kernel: trace: preemptirq_delay_test: add cpu affinity")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/trace/preemptirq_delay_test.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/kernel/trace/preemptirq_delay_test.c b/kernel/trace/preemptirq_delay_test.c index cb0871fbdb07..8af92dbe98f0 100644 --- a/kernel/trace/preemptirq_delay_test.c +++ b/kernel/trace/preemptirq_delay_test.c @@ -119,12 +119,15 @@ static int preemptirq_delay_run(void *data) { int i; int s = MIN(burst_size, NR_TEST_FUNCS); - struct cpumask cpu_mask; + cpumask_var_t cpu_mask; + + if (!alloc_cpumask_var(&cpu_mask, GFP_KERNEL)) + return -ENOMEM; if (cpu_affinity > -1) { - cpumask_clear(&cpu_mask); - cpumask_set_cpu(cpu_affinity, &cpu_mask); - if (set_cpus_allowed_ptr(current, &cpu_mask)) + cpumask_clear(cpu_mask); + cpumask_set_cpu(cpu_affinity, cpu_mask); + if (set_cpus_allowed_ptr(current, cpu_mask)) pr_err("cpu_affinity:%d, failed\n", cpu_affinity); } @@ -141,6 +144,8 @@ static int preemptirq_delay_run(void *data) __set_current_state(TASK_RUNNING); + free_cpumask_var(cpu_mask); + return 0; } |