From: Maarten Lankhorst <maarten.lankhorst@canonical.com> To: airlied@linux.ie Cc: thellstrom@vmware.com, nouveau@lists.freedesktop.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, bskeggs@redhat.com, alexander.deucher@amd.com, christian.koenig@amd.com Subject: [PATCH 03/19] drm/ttm: kill off some members to ttm_validate_buffer Date: Thu, 31 Jul 2014 17:33:01 +0200 [thread overview] Message-ID: <20140731153301.15061.38760.stgit@patser> (raw) In-Reply-To: <20140731153245.15061.63023.stgit@patser> This reorders the list to keep track of what buffers are reserved, so previous members are always unreserved. This gets rid of some bookkeeping that's no longer needed, while simplifying the code some. Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com> --- drivers/gpu/drm/qxl/qxl_release.c | 1 drivers/gpu/drm/ttm/ttm_execbuf_util.c | 142 +++++++++++-------------------- drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c | 1 include/drm/ttm/ttm_execbuf_util.h | 3 - 4 files changed, 50 insertions(+), 97 deletions(-) diff --git a/drivers/gpu/drm/qxl/qxl_release.c b/drivers/gpu/drm/qxl/qxl_release.c index 2b43e5deb051..e85c4d274dc0 100644 --- a/drivers/gpu/drm/qxl/qxl_release.c +++ b/drivers/gpu/drm/qxl/qxl_release.c @@ -350,7 +350,6 @@ void qxl_release_fence_buffer_objects(struct qxl_release *release) ttm_bo_add_to_lru(bo); __ttm_bo_unreserve(bo); - entry->reserved = false; } spin_unlock(&bdev->fence_lock); spin_unlock(&glob->lru_lock); diff --git a/drivers/gpu/drm/ttm/ttm_execbuf_util.c b/drivers/gpu/drm/ttm/ttm_execbuf_util.c index 39a11bbd2bac..6db47a72667e 100644 --- a/drivers/gpu/drm/ttm/ttm_execbuf_util.c +++ b/drivers/gpu/drm/ttm/ttm_execbuf_util.c @@ -32,20 +32,12 @@ #include <linux/sched.h> #include <linux/module.h> -static void ttm_eu_backoff_reservation_locked(struct list_head *list) +static void ttm_eu_backoff_reservation_reverse(struct list_head *list, + struct ttm_validate_buffer *entry) { - struct ttm_validate_buffer *entry; - - list_for_each_entry(entry, list, head) { + list_for_each_entry_continue_reverse(entry, list, head) { struct ttm_buffer_object *bo = entry->bo; - if (!entry->reserved) - continue; - entry->reserved = false; - if (entry->removed) { - ttm_bo_add_to_lru(bo); - entry->removed = false; - } __ttm_bo_unreserve(bo); } } @@ -56,27 +48,9 @@ static void ttm_eu_del_from_lru_locked(struct list_head *list) list_for_each_entry(entry, list, head) { struct ttm_buffer_object *bo = entry->bo; - if (!entry->reserved) - continue; + unsigned put_count = ttm_bo_del_from_lru(bo); - if (!entry->removed) { - entry->put_count = ttm_bo_del_from_lru(bo); - entry->removed = true; - } - } -} - -static void ttm_eu_list_ref_sub(struct list_head *list) -{ - struct ttm_validate_buffer *entry; - - list_for_each_entry(entry, list, head) { - struct ttm_buffer_object *bo = entry->bo; - - if (entry->put_count) { - ttm_bo_list_ref_sub(bo, entry->put_count, true); - entry->put_count = 0; - } + ttm_bo_list_ref_sub(bo, put_count, true); } } @@ -91,11 +65,18 @@ void ttm_eu_backoff_reservation(struct ww_acquire_ctx *ticket, entry = list_first_entry(list, struct ttm_validate_buffer, head); glob = entry->bo->glob; + spin_lock(&glob->lru_lock); - ttm_eu_backoff_reservation_locked(list); + list_for_each_entry(entry, list, head) { + struct ttm_buffer_object *bo = entry->bo; + + ttm_bo_add_to_lru(bo); + __ttm_bo_unreserve(bo); + } + spin_unlock(&glob->lru_lock); + if (ticket) ww_acquire_fini(ticket); - spin_unlock(&glob->lru_lock); } EXPORT_SYMBOL(ttm_eu_backoff_reservation); @@ -121,64 +102,55 @@ int ttm_eu_reserve_buffers(struct ww_acquire_ctx *ticket, if (list_empty(list)) return 0; - list_for_each_entry(entry, list, head) { - entry->reserved = false; - entry->put_count = 0; - entry->removed = false; - } - entry = list_first_entry(list, struct ttm_validate_buffer, head); glob = entry->bo->glob; if (ticket) ww_acquire_init(ticket, &reservation_ww_class); -retry: + list_for_each_entry(entry, list, head) { struct ttm_buffer_object *bo = entry->bo; - /* already slowpath reserved? */ - if (entry->reserved) - continue; - ret = __ttm_bo_reserve(bo, intr, (ticket == NULL), true, ticket); + if (!ret && unlikely(atomic_read(&bo->cpu_writers) > 0)) { + __ttm_bo_unreserve(bo); - if (ret == -EDEADLK) { - /* uh oh, we lost out, drop every reservation and try - * to only reserve this buffer, then start over if - * this succeeds. - */ - BUG_ON(ticket == NULL); - spin_lock(&glob->lru_lock); - ttm_eu_backoff_reservation_locked(list); - spin_unlock(&glob->lru_lock); - ttm_eu_list_ref_sub(list); - - if (intr) { - ret = ww_mutex_lock_slow_interruptible(&bo->resv->lock, - ticket); - if (unlikely(ret != 0)) { - if (ret == -EINTR) - ret = -ERESTARTSYS; - goto err_fini; - } - } else - ww_mutex_lock_slow(&bo->resv->lock, ticket); - - entry->reserved = true; - if (unlikely(atomic_read(&bo->cpu_writers) > 0)) { - ret = -EBUSY; - goto err; - } - goto retry; - } else if (ret) - goto err; - - entry->reserved = true; - if (unlikely(atomic_read(&bo->cpu_writers) > 0)) { ret = -EBUSY; - goto err; } + + if (!ret) + continue; + + /* uh oh, we lost out, drop every reservation and try + * to only reserve this buffer, then start over if + * this succeeds. + */ + ttm_eu_backoff_reservation_reverse(list, entry); + + if (ret == -EDEADLK && intr) { + ret = ww_mutex_lock_slow_interruptible(&bo->resv->lock, + ticket); + } else if (ret == -EDEADLK) { + ww_mutex_lock_slow(&bo->resv->lock, ticket); + ret = 0; + } + + if (unlikely(ret != 0)) { + if (ret == -EINTR) + ret = -ERESTARTSYS; + if (ticket) { + ww_acquire_done(ticket); + ww_acquire_fini(ticket); + } + return ret; + } + + /* move this item to the front of the list, + * forces correct iteration of the loop without keeping track + */ + list_del(&entry->head); + list_add(&entry->head, list); } if (ticket) @@ -186,20 +158,7 @@ retry: spin_lock(&glob->lru_lock); ttm_eu_del_from_lru_locked(list); spin_unlock(&glob->lru_lock); - ttm_eu_list_ref_sub(list); return 0; - -err: - spin_lock(&glob->lru_lock); - ttm_eu_backoff_reservation_locked(list); - spin_unlock(&glob->lru_lock); - ttm_eu_list_ref_sub(list); -err_fini: - if (ticket) { - ww_acquire_done(ticket); - ww_acquire_fini(ticket); - } - return ret; } EXPORT_SYMBOL(ttm_eu_reserve_buffers); @@ -229,7 +188,6 @@ void ttm_eu_fence_buffer_objects(struct ww_acquire_ctx *ticket, bo->sync_obj = driver->sync_obj_ref(sync_obj); ttm_bo_add_to_lru(bo); __ttm_bo_unreserve(bo); - entry->reserved = false; } spin_unlock(&bdev->fence_lock); spin_unlock(&glob->lru_lock); diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c index 24f067bf438d..b19b2b980cb4 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c @@ -346,7 +346,6 @@ static int vmw_bo_to_validate_list(struct vmw_sw_context *sw_context, ++sw_context->cur_val_buf; val_buf = &vval_buf->base; val_buf->bo = ttm_bo_reference(bo); - val_buf->reserved = false; list_add_tail(&val_buf->head, &sw_context->validate_nodes); vval_buf->validate_as_mob = validate_as_mob; } diff --git a/include/drm/ttm/ttm_execbuf_util.h b/include/drm/ttm/ttm_execbuf_util.h index fd95fd569ca3..8490cb8ee0d8 100644 --- a/include/drm/ttm/ttm_execbuf_util.h +++ b/include/drm/ttm/ttm_execbuf_util.h @@ -48,9 +48,6 @@ struct ttm_validate_buffer { struct list_head head; struct ttm_buffer_object *bo; - bool reserved; - bool removed; - int put_count; void *old_sync_obj; };
WARNING: multiple messages have this Message-ID (diff)
From: Maarten Lankhorst <maarten.lankhorst-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org> To: airlied-cv59FeDIM0c@public.gmane.org Cc: thellstrom-pghWNbHTmq7QT0dZR+AlfA@public.gmane.org, nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org, bskeggs-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, alexander.deucher-5C7GfCeVMHo@public.gmane.org, christian.koenig-5C7GfCeVMHo@public.gmane.org Subject: [PATCH 03/19] drm/ttm: kill off some members to ttm_validate_buffer Date: Thu, 31 Jul 2014 17:33:01 +0200 [thread overview] Message-ID: <20140731153301.15061.38760.stgit@patser> (raw) In-Reply-To: <20140731153245.15061.63023.stgit@patser> This reorders the list to keep track of what buffers are reserved, so previous members are always unreserved. This gets rid of some bookkeeping that's no longer needed, while simplifying the code some. Signed-off-by: Maarten Lankhorst <maarten.lankhorst-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org> --- drivers/gpu/drm/qxl/qxl_release.c | 1 drivers/gpu/drm/ttm/ttm_execbuf_util.c | 142 +++++++++++-------------------- drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c | 1 include/drm/ttm/ttm_execbuf_util.h | 3 - 4 files changed, 50 insertions(+), 97 deletions(-) diff --git a/drivers/gpu/drm/qxl/qxl_release.c b/drivers/gpu/drm/qxl/qxl_release.c index 2b43e5deb051..e85c4d274dc0 100644 --- a/drivers/gpu/drm/qxl/qxl_release.c +++ b/drivers/gpu/drm/qxl/qxl_release.c @@ -350,7 +350,6 @@ void qxl_release_fence_buffer_objects(struct qxl_release *release) ttm_bo_add_to_lru(bo); __ttm_bo_unreserve(bo); - entry->reserved = false; } spin_unlock(&bdev->fence_lock); spin_unlock(&glob->lru_lock); diff --git a/drivers/gpu/drm/ttm/ttm_execbuf_util.c b/drivers/gpu/drm/ttm/ttm_execbuf_util.c index 39a11bbd2bac..6db47a72667e 100644 --- a/drivers/gpu/drm/ttm/ttm_execbuf_util.c +++ b/drivers/gpu/drm/ttm/ttm_execbuf_util.c @@ -32,20 +32,12 @@ #include <linux/sched.h> #include <linux/module.h> -static void ttm_eu_backoff_reservation_locked(struct list_head *list) +static void ttm_eu_backoff_reservation_reverse(struct list_head *list, + struct ttm_validate_buffer *entry) { - struct ttm_validate_buffer *entry; - - list_for_each_entry(entry, list, head) { + list_for_each_entry_continue_reverse(entry, list, head) { struct ttm_buffer_object *bo = entry->bo; - if (!entry->reserved) - continue; - entry->reserved = false; - if (entry->removed) { - ttm_bo_add_to_lru(bo); - entry->removed = false; - } __ttm_bo_unreserve(bo); } } @@ -56,27 +48,9 @@ static void ttm_eu_del_from_lru_locked(struct list_head *list) list_for_each_entry(entry, list, head) { struct ttm_buffer_object *bo = entry->bo; - if (!entry->reserved) - continue; + unsigned put_count = ttm_bo_del_from_lru(bo); - if (!entry->removed) { - entry->put_count = ttm_bo_del_from_lru(bo); - entry->removed = true; - } - } -} - -static void ttm_eu_list_ref_sub(struct list_head *list) -{ - struct ttm_validate_buffer *entry; - - list_for_each_entry(entry, list, head) { - struct ttm_buffer_object *bo = entry->bo; - - if (entry->put_count) { - ttm_bo_list_ref_sub(bo, entry->put_count, true); - entry->put_count = 0; - } + ttm_bo_list_ref_sub(bo, put_count, true); } } @@ -91,11 +65,18 @@ void ttm_eu_backoff_reservation(struct ww_acquire_ctx *ticket, entry = list_first_entry(list, struct ttm_validate_buffer, head); glob = entry->bo->glob; + spin_lock(&glob->lru_lock); - ttm_eu_backoff_reservation_locked(list); + list_for_each_entry(entry, list, head) { + struct ttm_buffer_object *bo = entry->bo; + + ttm_bo_add_to_lru(bo); + __ttm_bo_unreserve(bo); + } + spin_unlock(&glob->lru_lock); + if (ticket) ww_acquire_fini(ticket); - spin_unlock(&glob->lru_lock); } EXPORT_SYMBOL(ttm_eu_backoff_reservation); @@ -121,64 +102,55 @@ int ttm_eu_reserve_buffers(struct ww_acquire_ctx *ticket, if (list_empty(list)) return 0; - list_for_each_entry(entry, list, head) { - entry->reserved = false; - entry->put_count = 0; - entry->removed = false; - } - entry = list_first_entry(list, struct ttm_validate_buffer, head); glob = entry->bo->glob; if (ticket) ww_acquire_init(ticket, &reservation_ww_class); -retry: + list_for_each_entry(entry, list, head) { struct ttm_buffer_object *bo = entry->bo; - /* already slowpath reserved? */ - if (entry->reserved) - continue; - ret = __ttm_bo_reserve(bo, intr, (ticket == NULL), true, ticket); + if (!ret && unlikely(atomic_read(&bo->cpu_writers) > 0)) { + __ttm_bo_unreserve(bo); - if (ret == -EDEADLK) { - /* uh oh, we lost out, drop every reservation and try - * to only reserve this buffer, then start over if - * this succeeds. - */ - BUG_ON(ticket == NULL); - spin_lock(&glob->lru_lock); - ttm_eu_backoff_reservation_locked(list); - spin_unlock(&glob->lru_lock); - ttm_eu_list_ref_sub(list); - - if (intr) { - ret = ww_mutex_lock_slow_interruptible(&bo->resv->lock, - ticket); - if (unlikely(ret != 0)) { - if (ret == -EINTR) - ret = -ERESTARTSYS; - goto err_fini; - } - } else - ww_mutex_lock_slow(&bo->resv->lock, ticket); - - entry->reserved = true; - if (unlikely(atomic_read(&bo->cpu_writers) > 0)) { - ret = -EBUSY; - goto err; - } - goto retry; - } else if (ret) - goto err; - - entry->reserved = true; - if (unlikely(atomic_read(&bo->cpu_writers) > 0)) { ret = -EBUSY; - goto err; } + + if (!ret) + continue; + + /* uh oh, we lost out, drop every reservation and try + * to only reserve this buffer, then start over if + * this succeeds. + */ + ttm_eu_backoff_reservation_reverse(list, entry); + + if (ret == -EDEADLK && intr) { + ret = ww_mutex_lock_slow_interruptible(&bo->resv->lock, + ticket); + } else if (ret == -EDEADLK) { + ww_mutex_lock_slow(&bo->resv->lock, ticket); + ret = 0; + } + + if (unlikely(ret != 0)) { + if (ret == -EINTR) + ret = -ERESTARTSYS; + if (ticket) { + ww_acquire_done(ticket); + ww_acquire_fini(ticket); + } + return ret; + } + + /* move this item to the front of the list, + * forces correct iteration of the loop without keeping track + */ + list_del(&entry->head); + list_add(&entry->head, list); } if (ticket) @@ -186,20 +158,7 @@ retry: spin_lock(&glob->lru_lock); ttm_eu_del_from_lru_locked(list); spin_unlock(&glob->lru_lock); - ttm_eu_list_ref_sub(list); return 0; - -err: - spin_lock(&glob->lru_lock); - ttm_eu_backoff_reservation_locked(list); - spin_unlock(&glob->lru_lock); - ttm_eu_list_ref_sub(list); -err_fini: - if (ticket) { - ww_acquire_done(ticket); - ww_acquire_fini(ticket); - } - return ret; } EXPORT_SYMBOL(ttm_eu_reserve_buffers); @@ -229,7 +188,6 @@ void ttm_eu_fence_buffer_objects(struct ww_acquire_ctx *ticket, bo->sync_obj = driver->sync_obj_ref(sync_obj); ttm_bo_add_to_lru(bo); __ttm_bo_unreserve(bo); - entry->reserved = false; } spin_unlock(&bdev->fence_lock); spin_unlock(&glob->lru_lock); diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c index 24f067bf438d..b19b2b980cb4 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c @@ -346,7 +346,6 @@ static int vmw_bo_to_validate_list(struct vmw_sw_context *sw_context, ++sw_context->cur_val_buf; val_buf = &vval_buf->base; val_buf->bo = ttm_bo_reference(bo); - val_buf->reserved = false; list_add_tail(&val_buf->head, &sw_context->validate_nodes); vval_buf->validate_as_mob = validate_as_mob; } diff --git a/include/drm/ttm/ttm_execbuf_util.h b/include/drm/ttm/ttm_execbuf_util.h index fd95fd569ca3..8490cb8ee0d8 100644 --- a/include/drm/ttm/ttm_execbuf_util.h +++ b/include/drm/ttm/ttm_execbuf_util.h @@ -48,9 +48,6 @@ struct ttm_validate_buffer { struct list_head head; struct ttm_buffer_object *bo; - bool reserved; - bool removed; - int put_count; void *old_sync_obj; };
next prev parent reply other threads:[~2014-07-31 15:33 UTC|newest] Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top 2014-07-31 15:32 [PATCH 01/19] fence: add debugging lines to fence_is_signaled for the callback Maarten Lankhorst 2014-07-31 15:32 ` Maarten Lankhorst 2014-07-31 15:32 ` [PATCH 02/19] drm/ttm: add interruptible parameter to ttm_eu_reserve_buffers Maarten Lankhorst 2014-07-31 15:32 ` Maarten Lankhorst 2014-07-31 15:33 ` Maarten Lankhorst [this message] 2014-07-31 15:33 ` [PATCH 03/19] drm/ttm: kill off some members to ttm_validate_buffer Maarten Lankhorst 2014-07-31 15:33 ` [PATCH 04/19] drm/nouveau: add reservation to nouveau_gem_ioctl_cpu_prep Maarten Lankhorst 2014-07-31 15:33 ` [PATCH 05/19] drm/nouveau: require reservations for nouveau_fence_sync and nouveau_bo_fence Maarten Lankhorst 2014-07-31 15:33 ` [PATCH 06/19] drm/ttm: call ttm_bo_wait while inside a reservation Maarten Lankhorst 2014-07-31 15:33 ` Maarten Lankhorst 2014-07-31 15:33 ` [PATCH 07/19] drm/ttm: kill fence_lock Maarten Lankhorst 2014-07-31 15:33 ` Maarten Lankhorst 2014-07-31 15:33 ` [PATCH 08/19] drm/nouveau: rework to new fence interface Maarten Lankhorst 2014-07-31 15:33 ` Maarten Lankhorst 2014-07-31 15:33 ` [PATCH 09/19] drm/radeon: handle lockup in delayed work, v2 Maarten Lankhorst 2014-07-31 15:33 ` Maarten Lankhorst 2014-08-01 16:35 ` Christian König 2014-08-01 16:35 ` Christian König 2014-08-01 17:46 ` Maarten Lankhorst 2014-08-01 17:46 ` Maarten Lankhorst 2014-08-04 8:36 ` Christian König 2014-08-04 8:36 ` Christian König 2014-08-04 8:55 ` Maarten Lankhorst 2014-08-04 8:55 ` Maarten Lankhorst 2014-08-04 11:57 ` Christian König 2014-08-04 11:57 ` Christian König 2014-08-04 13:34 ` Maarten Lankhorst 2014-08-04 13:34 ` Maarten Lankhorst 2014-08-04 14:37 ` Christian König 2014-08-04 14:37 ` Christian König 2014-08-04 14:40 ` Maarten Lankhorst 2014-08-04 14:40 ` Maarten Lankhorst 2014-08-04 14:45 ` Christian König 2014-08-04 14:45 ` Christian König 2014-08-04 14:58 ` Maarten Lankhorst 2014-08-04 14:58 ` Maarten Lankhorst 2014-08-04 15:04 ` Christian König 2014-08-04 15:04 ` Christian König 2014-08-04 15:09 ` Maarten Lankhorst 2014-08-04 15:09 ` Maarten Lankhorst 2014-08-04 17:04 ` Christian König 2014-08-04 17:04 ` Christian König 2014-08-05 8:16 ` Daniel Vetter 2014-08-05 8:16 ` Daniel Vetter 2014-08-05 9:34 ` Maarten Lankhorst 2014-08-05 9:34 ` Maarten Lankhorst 2014-07-31 15:33 ` [PATCH 10/19] drm/radeon: add timeout argument to radeon_fence_wait_seq Maarten Lankhorst 2014-07-31 15:33 ` Maarten Lankhorst 2014-07-31 15:33 ` [PATCH 11/19] drm/radeon: use common fence implementation for fences, v2 Maarten Lankhorst 2014-07-31 15:34 ` [PATCH 12/19] drm/qxl: rework to new fence interface Maarten Lankhorst 2014-07-31 15:34 ` Maarten Lankhorst 2014-07-31 15:34 ` [PATCH 13/19] drm/vmwgfx: get rid of different types of fence_flags entirely Maarten Lankhorst 2014-07-31 15:34 ` Maarten Lankhorst 2014-07-31 15:34 ` [PATCH 14/19] drm/vmwgfx: rework to new fence interface Maarten Lankhorst 2014-07-31 15:34 ` Maarten Lankhorst 2014-07-31 15:34 ` [PATCH 15/19] drm/ttm: flip the switch, and convert to dma_fence Maarten Lankhorst 2014-07-31 15:34 ` [PATCH 16/19] drm/nouveau: use rcu in nouveau_gem_ioctl_cpu_prep Maarten Lankhorst 2014-07-31 15:34 ` [PATCH 17/19] drm/radeon: use rcu waits in some ioctls Maarten Lankhorst 2014-07-31 15:34 ` Maarten Lankhorst 2014-08-01 8:27 ` Michel Dänzer 2014-08-01 10:12 ` Maarten Lankhorst 2014-08-01 14:13 ` Michel Dänzer 2014-08-01 17:07 ` Maarten Lankhorst 2014-08-04 8:42 ` Michel Dänzer 2014-08-04 8:56 ` Maarten Lankhorst 2014-08-04 9:25 ` Michel Dänzer 2014-08-04 9:30 ` Maarten Lankhorst 2014-07-31 15:34 ` [PATCH 18/19] drm/vmwgfx: use rcu in vmw_user_dmabuf_synccpu_grab Maarten Lankhorst 2014-07-31 15:34 ` [PATCH 19/19] drm/ttm: use rcu in core ttm Maarten Lankhorst
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