On Mon, Sep 30, 2024 at 05:44:33PM +0200, Alexander Lobakin wrote: > 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@xxxxxxxxx> > Closes: https://lore.kernel.org/oe-kbuild-all/202408141012.KhvKaxoh-lkp@xxxxxxxxx > Closes: https://lore.kernel.org/oe-kbuild-all/202408141243.eQiEOQQe-lkp@xxxxxxxxx > Fixes: ea8b1c4a6019 ("drivers: psci: PSCI checker module") > Cc: stable@xxxxxxxxxxxxxxx # 4.10+ > Signed-off-by: Alexander Lobakin <aleksander.lobakin@xxxxxxxxx> > --- > drivers/firmware/psci/psci_checker.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) Acked-by: Lorenzo Pieralisi <lpieralisi@xxxxxxxxxx> > 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 > -- > 2.46.2 >
