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Date:   Mon, 20 Sep 2021 09:54:05 +0800
From:   kernel test robot <lkp@...el.com>
To:     Fernando Ramos <greenfoo@....eu>, dri-devel@...ts.freedesktop.org
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        sean@...rly.run, linux-doc@...r.kernel.org,
        amd-gfx@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org,
        nouveau@...ts.freedesktop.org, linux-renesas-soc@...r.kernel.org
Subject: Re: [PATCH 03/15] dmr/msm: cleanup: drm_modeset_lock_all_ctx() -->
 DRM_MODESET_LOCK_ALL_BEGIN()

Hi Fernando,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on drm-exynos/exynos-drm-next]
[also build test ERROR on tegra-drm/drm/tegra/for-next linus/master v5.15-rc2 next-20210917]
[cannot apply to drm-intel/for-linux-next tegra/for-next drm-tip/drm-tip airlied/drm-next]
[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/Fernando-Ramos/drm-cleanup-Use-DRM_MODESET_LOCK_ALL_-helpers-where-possible/20210917-051842
base:   https://git.kernel.org/pub/scm/linux/kernel/git/daeinki/drm-exynos.git exynos-drm-next
config: arm-defconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (GCC) 11.2.0
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/0da6630f04d8f86f9d3c9a65fe61a6c6d182c87f
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Fernando-Ramos/drm-cleanup-Use-DRM_MODESET_LOCK_ALL_-helpers-where-possible/20210917-051842
        git checkout 0da6630f04d8f86f9d3c9a65fe61a6c6d182c87f
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=arm 

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

All errors (new ones prefixed by >>):

   In file included from include/drm/drm_crtc.h:36,
                    from include/drm/drm_atomic_helper.h:31,
                    from drivers/gpu/drm/msm/disp/msm_disp_snapshot.h:9,
                    from drivers/gpu/drm/msm/disp/msm_disp_snapshot_util.c:8:
   drivers/gpu/drm/msm/disp/msm_disp_snapshot_util.c: In function 'msm_disp_capture_atomic_state':
>> include/drm/drm_modeset_lock.h:167:14: error: implicit declaration of function 'drm_drv_uses_atomic_modeset' [-Werror=implicit-function-declaration]
     167 |         if (!drm_drv_uses_atomic_modeset(dev))                          \
         |              ^~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/msm/disp/msm_disp_snapshot_util.c:108:9: note: in expansion of macro 'DRM_MODESET_LOCK_ALL_BEGIN'
     108 |         DRM_MODESET_LOCK_ALL_BEGIN(ddev, ctx, 0, ret);
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +/drm_drv_uses_atomic_modeset +167 include/drm/drm_modeset_lock.h

a6a8bb848d5ca4 Daniel Vetter  2014-07-25  138  
06eaae46381737 Thierry Reding 2015-12-02  139  int drm_modeset_lock_all_ctx(struct drm_device *dev,
51fd371bbaf940 Rob Clark      2013-11-19  140  			     struct drm_modeset_acquire_ctx *ctx);
51fd371bbaf940 Rob Clark      2013-11-19  141  
b7ea04d299c78b Sean Paul      2018-11-29  142  /**
b7ea04d299c78b Sean Paul      2018-11-29  143   * DRM_MODESET_LOCK_ALL_BEGIN - Helper to acquire modeset locks
b7ea04d299c78b Sean Paul      2018-11-29  144   * @dev: drm device
b7ea04d299c78b Sean Paul      2018-11-29  145   * @ctx: local modeset acquire context, will be dereferenced
b7ea04d299c78b Sean Paul      2018-11-29  146   * @flags: DRM_MODESET_ACQUIRE_* flags to pass to drm_modeset_acquire_init()
b7ea04d299c78b Sean Paul      2018-11-29  147   * @ret: local ret/err/etc variable to track error status
b7ea04d299c78b Sean Paul      2018-11-29  148   *
b7ea04d299c78b Sean Paul      2018-11-29  149   * Use these macros to simplify grabbing all modeset locks using a local
b7ea04d299c78b Sean Paul      2018-11-29  150   * context. This has the advantage of reducing boilerplate, but also properly
b7ea04d299c78b Sean Paul      2018-11-29  151   * checking return values where appropriate.
b7ea04d299c78b Sean Paul      2018-11-29  152   *
b7ea04d299c78b Sean Paul      2018-11-29  153   * Any code run between BEGIN and END will be holding the modeset locks.
b7ea04d299c78b Sean Paul      2018-11-29  154   *
b7ea04d299c78b Sean Paul      2018-11-29  155   * This must be paired with DRM_MODESET_LOCK_ALL_END(). We will jump back and
b7ea04d299c78b Sean Paul      2018-11-29  156   * forth between the labels on deadlock and error conditions.
b7ea04d299c78b Sean Paul      2018-11-29  157   *
b7ea04d299c78b Sean Paul      2018-11-29  158   * Drivers can acquire additional modeset locks. If any lock acquisition
b7ea04d299c78b Sean Paul      2018-11-29  159   * fails, the control flow needs to jump to DRM_MODESET_LOCK_ALL_END() with
b7ea04d299c78b Sean Paul      2018-11-29  160   * the @ret parameter containing the return value of drm_modeset_lock().
b7ea04d299c78b Sean Paul      2018-11-29  161   *
b7ea04d299c78b Sean Paul      2018-11-29  162   * Returns:
b7ea04d299c78b Sean Paul      2018-11-29  163   * The only possible value of ret immediately after DRM_MODESET_LOCK_ALL_BEGIN()
b7ea04d299c78b Sean Paul      2018-11-29  164   * is 0, so no error checking is necessary
b7ea04d299c78b Sean Paul      2018-11-29  165   */
b7ea04d299c78b Sean Paul      2018-11-29  166  #define DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, flags, ret)		\
77ef38574beb3e Daniel Vetter  2020-08-14 @167  	if (!drm_drv_uses_atomic_modeset(dev))				\
77ef38574beb3e Daniel Vetter  2020-08-14  168  		mutex_lock(&dev->mode_config.mutex);			\
b7ea04d299c78b Sean Paul      2018-11-29  169  	drm_modeset_acquire_init(&ctx, flags);				\
b7ea04d299c78b Sean Paul      2018-11-29  170  modeset_lock_retry:							\
b7ea04d299c78b Sean Paul      2018-11-29  171  	ret = drm_modeset_lock_all_ctx(dev, &ctx);			\
b7ea04d299c78b Sean Paul      2018-11-29  172  	if (ret)							\
b7ea04d299c78b Sean Paul      2018-11-29  173  		goto modeset_lock_fail;
b7ea04d299c78b Sean Paul      2018-11-29  174  

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

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