linux-kernel - drivers/media/test-drivers/vidtv/vidtv_mux.c:379:13: warning: stack frame size of 3120 bytes in function 'vidtv_mux

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Message-ID: <202106162302.B4qt0VEL-lkp@intel.com>
Date:   Wed, 16 Jun 2021 23:17:10 +0800
From:   kernel test robot <lkp@...el.com>
To:     "Daniel W. S. Almeida" <dwlsalmeida@...il.com>
Cc:     kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
        linux-kernel@...r.kernel.org,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org
Subject: drivers/media/test-drivers/vidtv/vidtv_mux.c:379:13: warning: stack
 frame size of 3120 bytes in function 'vidtv_mux_tick'

Hi Daniel,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   94f0b2d4a1d0c52035aef425da5e022bd2cb1c71
commit: f90cf6079bf67988f8b1ad1ade70fc89d0080905 media: vidtv: add a bridge driver
date:   9 months ago
config: powerpc64-randconfig-r026-20210615 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 64720f57bea6a6bf033feef4a5751ab9c0c3b401)
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 powerpc64 cross compiling tool for clang build
        # apt-get install binutils-powerpc64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f90cf6079bf67988f8b1ad1ade70fc89d0080905
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout f90cf6079bf67988f8b1ad1ade70fc89d0080905
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc64 

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 >>):

   In file included from drivers/media/test-drivers/vidtv/vidtv_mux.c:18:
   In file included from include/linux/slab.h:15:
   In file included from include/linux/gfp.h:5:
   In file included from include/linux/mmdebug.h:5:
   In file included from include/linux/bug.h:5:
   In file included from arch/powerpc/include/asm/bug.h:109:
   In file included from include/asm-generic/bug.h:20:
   In file included from include/linux/kernel.h:12:
   In file included from include/linux/bitops.h:29:
   In file included from arch/powerpc/include/asm/bitops.h:62:
   arch/powerpc/include/asm/barrier.h:49:9: warning: '__lwsync' macro redefined [-Wmacro-redefined]
   #define __lwsync()      __asm__ __volatile__ (stringify_in_c(LWSYNC) : : :"memory")
           ^
   <built-in>:309:9: note: previous definition is here
   #define __lwsync __builtin_ppc_lwsync
           ^
>> drivers/media/test-drivers/vidtv/vidtv_mux.c:379:13: warning: stack frame size of 3120 bytes in function 'vidtv_mux_tick' [-Wframe-larger-than=]
   static void vidtv_mux_tick(struct work_struct *work)
               ^
   2 warnings generated.


vim +/vidtv_mux_tick +379 drivers/media/test-drivers/vidtv/vidtv_mux.c

   378	
 > 379	static void vidtv_mux_tick(struct work_struct *work)
   380	{
   381		struct vidtv_mux *m = container_of(work,
   382						   struct vidtv_mux,
   383						   mpeg_thread);
   384		u32 nbytes;
   385		u32 npkts;
   386	
   387		while (m->streaming) {
   388			nbytes = 0;
   389	
   390			vidtv_mux_update_clk(m);
   391	
   392			if (vidtv_mux_should_push_pcr(m))
   393				nbytes += vidtv_mux_push_pcr(m);
   394	
   395			if (vidtv_mux_should_push_si(m))
   396				nbytes += vidtv_mux_push_si(m);
   397	
   398			nbytes += vidtv_mux_poll_encoders(m);
   399			nbytes += vidtv_mux_check_mux_rate(m);
   400	
   401			npkts = nbytes / TS_PACKET_LEN;
   402	
   403			/* if the buffer is not aligned there is a bug somewhere */
   404			if (nbytes % TS_PACKET_LEN)
   405				pr_err_ratelimited("Misaligned buffer\n");
   406	
   407			if (m->on_new_packets_available_cb)
   408				m->on_new_packets_available_cb(m->priv,
   409							       m->mux_buf,
   410							       npkts);
   411	
   412			vidtv_mux_clear(m);
   413	
   414			usleep_range(VIDTV_SLEEP_USECS, VIDTV_MAX_SLEEP_USECS);
   415		}
   416	}
   417	

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

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