linux-kernel - drivers/usb/gadget/udc/max3420_udc.c:844:12: warning: stack frame size of 12888 bytes in function 'max3420

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Message-ID: <202006210419.feAeIxTX%lkp@intel.com>
Date:   Sun, 21 Jun 2020 04:02:23 +0800
From:   kernel test robot <lkp@...el.com>
To:     Jassi Brar <jaswinder.singh@...aro.org>
Cc:     kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
        linux-kernel@...r.kernel.org, Felipe Balbi <balbi@...nel.org>
Subject: drivers/usb/gadget/udc/max3420_udc.c:844:12: warning: stack frame
 size of 12888 bytes in function 'max3420_thread'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   4333a9b0b67bb4e8bcd91bdd80da80b0ec151162
commit: 48ba02b2e2b1a1c80718e93fefe99c8319597c4a usb: gadget: add udc driver for max3420
date:   3 months ago
config: x86_64-randconfig-a014-20200620 (attached as .config)
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project f5bbe390d23d7da0ffb110cdb24b583c2dc87eba)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        git checkout 48ba02b2e2b1a1c80718e93fefe99c8319597c4a
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>, old ones prefixed by <<):

>> drivers/usb/gadget/udc/max3420_udc.c:844:12: warning: stack frame size of 12888 bytes in function 'max3420_thread' [-Wframe-larger-than=]
static int max3420_thread(void *dev_id)
^
1 warning generated.

vim +/max3420_thread +844 drivers/usb/gadget/udc/max3420_udc.c

   843	
 > 844	static int max3420_thread(void *dev_id)
   845	{
   846		struct max3420_udc *udc = dev_id;
   847		struct spi_device *spi = udc->spi;
   848		int i, loop_again = 1;
   849		unsigned long flags;
   850	
   851		while (!kthread_should_stop()) {
   852			if (!loop_again) {
   853				ktime_t kt = ns_to_ktime(1000 * 1000 * 250); /* 250ms */
   854	
   855				set_current_state(TASK_INTERRUPTIBLE);
   856	
   857				spin_lock_irqsave(&udc->lock, flags);
   858				if (udc->todo & ENABLE_IRQ) {
   859					enable_irq(spi->irq);
   860					udc->todo &= ~ENABLE_IRQ;
   861				}
   862				spin_unlock_irqrestore(&udc->lock, flags);
   863	
   864				schedule_hrtimeout(&kt, HRTIMER_MODE_REL);
   865			}
   866			loop_again = 0;
   867	
   868			mutex_lock(&udc->spi_bus_mutex);
   869	
   870			/* If bus-vbus_active and disconnected */
   871			if (!udc->vbus_active || !udc->softconnect)
   872				goto loop;
   873	
   874			if (max3420_start(udc)) {
   875				loop_again = 1;
   876				goto loop;
   877			}
   878	
   879			if (max3420_handle_irqs(udc)) {
   880				loop_again = 1;
   881				goto loop;
   882			}
   883	
   884			if (spi_max3420_rwkup(udc)) {
   885				loop_again = 1;
   886				goto loop;
   887			}
   888	
   889			max3420_do_data(udc, 0, 1); /* get done with the EP0 ZLP */
   890	
   891			for (i = 1; i < MAX3420_MAX_EPS; i++) {
   892				struct max3420_ep *ep = &udc->ep[i];
   893	
   894				if (spi_max3420_enable(ep))
   895					loop_again = 1;
   896				if (spi_max3420_stall(ep))
   897					loop_again = 1;
   898			}
   899	loop:
   900			mutex_unlock(&udc->spi_bus_mutex);
   901		}
   902	
   903		set_current_state(TASK_RUNNING);
   904		dev_info(udc->dev, "SPI thread exiting");
   905		return 0;
   906	}
   907	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

Download attachment ".config.gz" of type "application/gzip" (40925 bytes)