linux-kernel - drivers/media/common/saa7146/saa7146_hlp.c:648:5: warning: stack frame size (1104) exceeds limit (1024) in function 'saa7146_enable

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Message-ID: <202106231928.Oi0EnxwU-lkp@intel.com>
Date:   Wed, 23 Jun 2021 19:42:42 +0800
From:   kernel test robot <lkp@...el.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
        linux-kernel@...r.kernel.org,
        Nathan Chancellor <nathan@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: drivers/media/common/saa7146/saa7146_hlp.c:648:5: warning: stack
 frame size (1104) exceeds limit (1024) in function 'saa7146_enable_overlay'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   0c18f29aae7ce3dadd26d8ee3505d07cc982df75
commit: 97e4910232fa1f81e806aa60c25a0450276d99a2 linux/compiler-clang.h: define HAVE_BUILTIN_BSWAP*
date:   3 months ago
config: powerpc-randconfig-r021-20210623 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project b259740801d3515810ecc15bf0c24b0d476a1608)
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 powerpc cross compiling tool for clang build
        # apt-get install binutils-powerpc-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=97e4910232fa1f81e806aa60c25a0450276d99a2
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 97e4910232fa1f81e806aa60c25a0450276d99a2
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc 

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/common/saa7146/saa7146_hlp.c:4:
   In file included from include/linux/kernel.h:11:
   In file included from include/linux/bitops.h:32:
   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/common/saa7146/saa7146_hlp.c:648:5: warning: stack frame size (1104) exceeds limit (1024) in function 'saa7146_enable_overlay' [-Wframe-larger-than]
   int saa7146_enable_overlay(struct saa7146_fh *fh)
       ^
   2 warnings generated.


vim +/saa7146_enable_overlay +648 drivers/media/common/saa7146/saa7146_hlp.c

^1da177e4c3f41 drivers/media/common/saa7146_hlp.c Linus Torvalds 2005-04-16  647  
^1da177e4c3f41 drivers/media/common/saa7146_hlp.c Linus Torvalds 2005-04-16 @648  int saa7146_enable_overlay(struct saa7146_fh *fh)
^1da177e4c3f41 drivers/media/common/saa7146_hlp.c Linus Torvalds 2005-04-16  649  {
^1da177e4c3f41 drivers/media/common/saa7146_hlp.c Linus Torvalds 2005-04-16  650  	struct saa7146_dev *dev = fh->dev;
^1da177e4c3f41 drivers/media/common/saa7146_hlp.c Linus Torvalds 2005-04-16  651  	struct saa7146_vv *vv = dev->vv_data;
^1da177e4c3f41 drivers/media/common/saa7146_hlp.c Linus Torvalds 2005-04-16  652  
5da545ad08a3c6 drivers/media/common/saa7146_hlp.c Hans Verkuil   2012-05-01  653  	saa7146_set_window(dev, vv->ov.win.w.width, vv->ov.win.w.height, vv->ov.win.field);
5da545ad08a3c6 drivers/media/common/saa7146_hlp.c Hans Verkuil   2012-05-01  654  	saa7146_set_position(dev, vv->ov.win.w.left, vv->ov.win.w.top, vv->ov.win.w.height, vv->ov.win.field, vv->ov_fmt->pixelformat);
^1da177e4c3f41 drivers/media/common/saa7146_hlp.c Linus Torvalds 2005-04-16  655  	saa7146_set_output_format(dev, vv->ov_fmt->trans);
^1da177e4c3f41 drivers/media/common/saa7146_hlp.c Linus Torvalds 2005-04-16  656  	saa7146_set_clipping_rect(fh);
^1da177e4c3f41 drivers/media/common/saa7146_hlp.c Linus Torvalds 2005-04-16  657  
^1da177e4c3f41 drivers/media/common/saa7146_hlp.c Linus Torvalds 2005-04-16  658  	/* enable video dma1 */
^1da177e4c3f41 drivers/media/common/saa7146_hlp.c Linus Torvalds 2005-04-16  659  	saa7146_write(dev, MC1, (MASK_06 | MASK_22));
^1da177e4c3f41 drivers/media/common/saa7146_hlp.c Linus Torvalds 2005-04-16  660  	return 0;
^1da177e4c3f41 drivers/media/common/saa7146_hlp.c Linus Torvalds 2005-04-16  661  }
^1da177e4c3f41 drivers/media/common/saa7146_hlp.c Linus Torvalds 2005-04-16  662  

:::::: The code at line 648 was first introduced by commit
:::::: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Linux-2.6.12-rc2

:::::: TO: Linus Torvalds <torvalds@...970.osdl.org>
:::::: CC: Linus Torvalds <torvalds@...970.osdl.org>

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

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