Re: [PATCH 03/15] dmr/msm: cleanup: drm_modeset_lock_all_ctx() --> DRM_MODESET_LOCK_ALL_BEGIN()

From: kernel test robot
Date: Sun Sep 19 2021 - 22:39:37 EST

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@xxxxxxxxx>

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

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