Re: [PATCH V2 1/2] drm/vkms: Add support for virtual hardware mode

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Hi Sumera,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v5.12-rc1 next-20210303]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Sumera-Priyadarsini/Add-virtual-hardware-module/20210303-205440
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git f69d02e37a85645aa90d18cacfff36dba370f797
config: powerpc64-randconfig-p002-20210303 (attached as .config)
compiler: powerpc64-linux-gcc (GCC) 9.3.0
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
        # https://github.com/0day-ci/linux/commit/67e97bc2a047c91e1de3544be8668ff9a1e2775b
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Sumera-Priyadarsini/Add-virtual-hardware-module/20210303-205440
        git checkout 67e97bc2a047c91e1de3544be8668ff9a1e2775b
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc64 

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

All warnings (new ones prefixed by >>):

   drivers/gpu/drm/vkms/vkms_composer.c: In function 'vkms_composer_worker':
>> drivers/gpu/drm/vkms/vkms_composer.c:226:20: warning: variable 'wb_pending' set but not used [-Wunused-but-set-variable]
     226 |  bool crc_pending, wb_pending;
         |                    ^~~~~~~~~~


vim +/wb_pending +226 drivers/gpu/drm/vkms/vkms_composer.c

67e97bc2a047c9 drivers/gpu/drm/vkms/vkms_composer.c Sumera Priyadarsini 2021-03-03  209  
0ca33adb91c0a9 drivers/gpu/drm/vkms/vkms_crc.c      Haneen Mohammed     2018-09-04  210  /**
a4e7e98e90ebd9 drivers/gpu/drm/vkms/vkms_composer.c Rodrigo Siqueira    2019-06-25  211   * vkms_composer_worker - ordered work_struct to compute CRC
0ca33adb91c0a9 drivers/gpu/drm/vkms/vkms_crc.c      Haneen Mohammed     2018-09-04  212   *
0ca33adb91c0a9 drivers/gpu/drm/vkms/vkms_crc.c      Haneen Mohammed     2018-09-04  213   * @work: work_struct
0ca33adb91c0a9 drivers/gpu/drm/vkms/vkms_crc.c      Haneen Mohammed     2018-09-04  214   *
a4e7e98e90ebd9 drivers/gpu/drm/vkms/vkms_composer.c Rodrigo Siqueira    2019-06-25  215   * Work handler for composing and computing CRCs. work_struct scheduled in
0ca33adb91c0a9 drivers/gpu/drm/vkms/vkms_crc.c      Haneen Mohammed     2018-09-04  216   * an ordered workqueue that's periodically scheduled to run by
0ca33adb91c0a9 drivers/gpu/drm/vkms/vkms_crc.c      Haneen Mohammed     2018-09-04  217   * _vblank_handle() and flushed at vkms_atomic_crtc_destroy_state().
0ca33adb91c0a9 drivers/gpu/drm/vkms/vkms_crc.c      Haneen Mohammed     2018-09-04  218   */
a4e7e98e90ebd9 drivers/gpu/drm/vkms/vkms_composer.c Rodrigo Siqueira    2019-06-25  219  void vkms_composer_worker(struct work_struct *work)
6c234fe37c5762 drivers/gpu/drm/vkms/vkms_crc.c      Haneen Mohammed     2018-08-02  220  {
6c234fe37c5762 drivers/gpu/drm/vkms/vkms_crc.c      Haneen Mohammed     2018-08-02  221  	struct vkms_crtc_state *crtc_state = container_of(work,
6c234fe37c5762 drivers/gpu/drm/vkms/vkms_crc.c      Haneen Mohammed     2018-08-02  222  						struct vkms_crtc_state,
a4e7e98e90ebd9 drivers/gpu/drm/vkms/vkms_composer.c Rodrigo Siqueira    2019-06-25  223  						composer_work);
6c234fe37c5762 drivers/gpu/drm/vkms/vkms_crc.c      Haneen Mohammed     2018-08-02  224  	struct drm_crtc *crtc = crtc_state->base.crtc;
6c234fe37c5762 drivers/gpu/drm/vkms/vkms_crc.c      Haneen Mohammed     2018-08-02  225  	struct vkms_output *out = drm_crtc_to_vkms_output(crtc);
dbd9d80c1b2e03 drivers/gpu/drm/vkms/vkms_composer.c Rodrigo Siqueira    2020-08-30 @226  	bool crc_pending, wb_pending;
0ca33adb91c0a9 drivers/gpu/drm/vkms/vkms_crc.c      Haneen Mohammed     2018-09-04  227  	u64 frame_start, frame_end;
67e97bc2a047c9 drivers/gpu/drm/vkms/vkms_composer.c Sumera Priyadarsini 2021-03-03  228  	u32 crc32 = 0;
953025763d1421 drivers/gpu/drm/vkms/vkms_composer.c Rodrigo Siqueira    2020-08-30  229  	int ret;
0ca33adb91c0a9 drivers/gpu/drm/vkms/vkms_crc.c      Haneen Mohammed     2018-09-04  230  
a4e7e98e90ebd9 drivers/gpu/drm/vkms/vkms_composer.c Rodrigo Siqueira    2019-06-25  231  	spin_lock_irq(&out->composer_lock);
0ca33adb91c0a9 drivers/gpu/drm/vkms/vkms_crc.c      Haneen Mohammed     2018-09-04  232  	frame_start = crtc_state->frame_start;
0ca33adb91c0a9 drivers/gpu/drm/vkms/vkms_crc.c      Haneen Mohammed     2018-09-04  233  	frame_end = crtc_state->frame_end;
18d0952a838ba5 drivers/gpu/drm/vkms/vkms_crc.c      Daniel Vetter       2019-06-07  234  	crc_pending = crtc_state->crc_pending;
dbd9d80c1b2e03 drivers/gpu/drm/vkms/vkms_composer.c Rodrigo Siqueira    2020-08-30  235  	wb_pending = crtc_state->wb_pending;
18d0952a838ba5 drivers/gpu/drm/vkms/vkms_crc.c      Daniel Vetter       2019-06-07  236  	crtc_state->frame_start = 0;
18d0952a838ba5 drivers/gpu/drm/vkms/vkms_crc.c      Daniel Vetter       2019-06-07  237  	crtc_state->frame_end = 0;
18d0952a838ba5 drivers/gpu/drm/vkms/vkms_crc.c      Daniel Vetter       2019-06-07  238  	crtc_state->crc_pending = false;
a4e7e98e90ebd9 drivers/gpu/drm/vkms/vkms_composer.c Rodrigo Siqueira    2019-06-25  239  	spin_unlock_irq(&out->composer_lock);
0ca33adb91c0a9 drivers/gpu/drm/vkms/vkms_crc.c      Haneen Mohammed     2018-09-04  240  
18d0952a838ba5 drivers/gpu/drm/vkms/vkms_crc.c      Daniel Vetter       2019-06-07  241  	/*
18d0952a838ba5 drivers/gpu/drm/vkms/vkms_crc.c      Daniel Vetter       2019-06-07  242  	 * We raced with the vblank hrtimer and previous work already computed
18d0952a838ba5 drivers/gpu/drm/vkms/vkms_crc.c      Daniel Vetter       2019-06-07  243  	 * the crc, nothing to do.
18d0952a838ba5 drivers/gpu/drm/vkms/vkms_crc.c      Daniel Vetter       2019-06-07  244  	 */
18d0952a838ba5 drivers/gpu/drm/vkms/vkms_crc.c      Daniel Vetter       2019-06-07  245  	if (!crc_pending)
18d0952a838ba5 drivers/gpu/drm/vkms/vkms_crc.c      Daniel Vetter       2019-06-07  246  		return;
6c234fe37c5762 drivers/gpu/drm/vkms/vkms_crc.c      Haneen Mohammed     2018-08-02  247  
67e97bc2a047c9 drivers/gpu/drm/vkms/vkms_composer.c Sumera Priyadarsini 2021-03-03  248  	ret = vkms_composer_common(crtc_state, out, crtc_state->wb_pending, &crc32);
67e97bc2a047c9 drivers/gpu/drm/vkms/vkms_composer.c Sumera Priyadarsini 2021-03-03  249  	if (ret == -EINVAL)
953025763d1421 drivers/gpu/drm/vkms/vkms_composer.c Rodrigo Siqueira    2020-08-30  250  		return;
18d0952a838ba5 drivers/gpu/drm/vkms/vkms_crc.c      Daniel Vetter       2019-06-07  251  	/*
18d0952a838ba5 drivers/gpu/drm/vkms/vkms_crc.c      Daniel Vetter       2019-06-07  252  	 * The worker can fall behind the vblank hrtimer, make sure we catch up.
0ca33adb91c0a9 drivers/gpu/drm/vkms/vkms_crc.c      Haneen Mohammed     2018-09-04  253  	 */
0ca33adb91c0a9 drivers/gpu/drm/vkms/vkms_crc.c      Haneen Mohammed     2018-09-04  254  	while (frame_start <= frame_end)
0ca33adb91c0a9 drivers/gpu/drm/vkms/vkms_crc.c      Haneen Mohammed     2018-09-04  255  		drm_crtc_add_crc_entry(crtc, true, frame_start++, &crc32);
6c234fe37c5762 drivers/gpu/drm/vkms/vkms_crc.c      Haneen Mohammed     2018-08-02  256  }
6c234fe37c5762 drivers/gpu/drm/vkms/vkms_crc.c      Haneen Mohammed     2018-08-02  257  

---
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