On Wed, Oct 09, 2024 at 05:26:18PM +0200, Alexander Lobakin wrote:

From: Alexander Lobakin aleksander.lobakin@intel.com Date: Mon, 30 Sep 2024 17:44:33 +0200

...

kthread_create_on_cpu() always requires format string to contain one '%u' at the end, as it automatically adds the CPU ID when passing it to kthread_create_on_node(). The former isn't marked as __printf() as it's not printf-like itself, which effectively hides this from the compiler. If you convert this function to printf-like, you'll see the following:

In file included from drivers/firmware/psci/psci_checker.c:15: drivers/firmware/psci/psci_checker.c: In function 'suspend_tests': drivers/firmware/psci/psci_checker.c:401:48: warning: too many arguments for format [-Wformat-extra-args] 401 | "psci_suspend_test"); | ^~~~~~~~~~~~~~~~~~~ drivers/firmware/psci/psci_checker.c:400:32: warning: data argument not used by format string [-Wformat-extra-args] 400 | (void *)(long)cpu, cpu, | ^ 401 | "psci_suspend_test"); | ~~~~~~~~~~~~~~~~~~~

Add the missing format literal to fix this. Now the corresponding kthread will be named as "psci_suspend_test-<cpuid>", as it's meant by kthread_create_on_cpu().

Reported-by: kernel test robot lkp@intel.com Closes: https://lore.kernel.org/oe-kbuild-all/202408141012.KhvKaxoh-lkp@intel.com Closes: https://lore.kernel.org/oe-kbuild-all/202408141243.eQiEOQQe-lkp@intel.com Fixes: ea8b1c4a6019 ("drivers: psci: PSCI checker module") Cc: stable@vger.kernel.org # 4.10+ Signed-off-by: Alexander Lobakin aleksander.lobakin@intel.com

Ping? Who's taking this?

I would expect this to go through the soc tree.

Arnd, are you happy to pick this up?

FWIW:

Acked-by: Mark Rutland mark.rutland@arm.com

Mark.

...

---

drivers/firmware/psci/psci_checker.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/firmware/psci/psci_checker.c b/drivers/firmware/psci/psci_checker.c index 116eb465cdb4..ecc511c745ce 100644 --- a/drivers/firmware/psci/psci_checker.c +++ b/drivers/firmware/psci/psci_checker.c @@ -398,7 +398,7 @@ static int suspend_tests(void) thread = kthread_create_on_cpu(suspend_test_thread, (void *)(long)cpu, cpu,

• 			       "psci_suspend_test");
  

• 			       "psci_suspend_test-%u");
  

  if (IS_ERR(thread)) pr_err("Failed to create kthread on CPU %d\n", cpu); else

Thanks, Olek