Merge branches 'expcb.2026.07.24a', 'misc.2026.07.30a', 'rcu-tasks.2026.07.30a', 'srcu.2026.08.11a' and 'torture.2026.08.14a' into HEADgrafted

Changes:

Make expedited grace periods expedite normal RCU callbacks

Miscellaneous fixes:
 * Improve diagnostic output with character task states.
 * Mark accesses to inform KCSAN of concurrency design.
 * Move from kmalloc() to kmalloc_obj().
 * Documentation updates.
 * Improve handling of RCU deferred quiescent states.
 * Clean up unused function arguments and structure fields.
 * Reduce show_rcu_gp_kthreads() stack space.

Tasks RCU updates:
 * Clean up after SRCU re-implementation of Tasks Trace RCU.
 * Mark accesses to inform KCSAN of concurrency design.
 * Add ->lazy_timer status to diagnostic output.
 * Remove an unnecessary memory barrier.
 * Fix a data race, courtesy of KCSAN.
 * Documentation updates.
 * Convert cond_resched_tasks_rcu_qs() from macro to static inline
   function.

SRCU updates:
 * Add Rust helpers for SRCU.
 * Avoid losing queued work at cleanup_srcu_struct() time.

Torture-test updates:
 * Preparation work for immediate RCU priority deboosting.
 * Test RCU readers from real interrupt handlers (as opposed to softirq).
 * Simplify code through use of cpumask_next_wrap().
 * Improve diagnostic output with character task states.
 * Add rcutorture.nwriters parameter to allow lightweight stall testing,
   and rcutorture.stall_only to make doing so easier.
 * Test an RCU Tasks Trace grace period implying an RCU grace period.
 * Make RCU Tasks Trace torturing track reader batches.
 * Fix a data race, courtesy of KCSAN.
 * Plug a shuffle_tmp_mask memory leak on kthread spawn failure.

1 files changed, 258 insertions, 0 deletions

diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
new file mode 100644
index 000000000..e97faabcd
--- /dev/null
+++ b/drivers/gpu/drm/Makefile
@@ -0,0 +1,258 @@
+# SPDX-License-Identifier: GPL-2.0
+
+# Makefile for the drm device driver.  This driver provides support for the
+# Direct Rendering Infrastructure (DRI) in XFree86 4.1.0 and higher.
+
+CFLAGS-$(CONFIG_DRM_USE_DYNAMIC_DEBUG)	+= -DDYNAMIC_DEBUG_MODULE
+
+# Unconditionally enable W=1 warnings locally
+# --- begin copy-paste W=1 warnings from scripts/Makefile.warn
+subdir-ccflags-y += -Wextra -Wunused -Wno-unused-parameter
+subdir-ccflags-y += $(call cc-option, -Wrestrict)
+subdir-ccflags-y += -Wmissing-format-attribute
+subdir-ccflags-y += -Wold-style-definition
+subdir-ccflags-y += -Wmissing-include-dirs
+subdir-ccflags-y += $(call cc-option, -Wunused-but-set-variable)
+subdir-ccflags-y += $(call cc-option, -Wunused-const-variable)
+subdir-ccflags-y += $(call cc-option, -Wpacked-not-aligned)
+subdir-ccflags-y += $(call cc-option, -Wformat-overflow)
+# FIXME: fix -Wformat-truncation warnings and uncomment
+#subdir-ccflags-y += $(call cc-option, -Wformat-truncation)
+subdir-ccflags-y += $(call cc-option, -Wstringop-truncation)
+# The following turn off the warnings enabled by -Wextra
+ifeq ($(findstring 2, $(KBUILD_EXTRA_WARN)),)
+subdir-ccflags-y += -Wno-missing-field-initializers
+subdir-ccflags-y += -Wno-shift-negative-value
+endif
+ifeq ($(findstring 3, $(KBUILD_EXTRA_WARN)),)
+subdir-ccflags-y += -Wno-sign-compare
+endif
+# --- end copy-paste
+
+# Enable -Werror in CI and development
+subdir-ccflags-$(CONFIG_DRM_WERROR) += -Werror
+
+drm-y := \
+	drm_atomic.o \
+	drm_atomic_uapi.o \
+	drm_auth.o \
+	drm_blend.o \
+	drm_bridge.o \
+	drm_cache.o \
+	drm_color_mgmt.o \
+	drm_colorop.o \
+	drm_connector.o \
+	drm_crtc.o \
+	drm_displayid.o \
+	drm_drv.o \
+	drm_dumb_buffers.o \
+	drm_edid.o \
+	drm_eld.o \
+	drm_encoder.o \
+	drm_file.o \
+	drm_fourcc.o \
+	drm_framebuffer.o \
+	drm_gem.o \
+	drm_ioctl.o \
+	drm_lease.o \
+	drm_managed.o \
+	drm_mm.o \
+	drm_mode_config.o \
+	drm_mode_object.o \
+	drm_modes.o \
+	drm_modeset_lock.o \
+	drm_plane.o \
+	drm_prime.o \
+	drm_print.o \
+	drm_property.o \
+	drm_rect.o \
+	drm_syncobj.o \
+	drm_sysfs.o \
+	drm_trace_points.o \
+	drm_vblank.o \
+	drm_vblank_work.o \
+	drm_vma_manager.o \
+	drm_writeback.o
+drm-$(CONFIG_DRM_CLIENT) += \
+	drm_client.o \
+	drm_client_event.o \
+	drm_client_modeset.o \
+	drm_client_sysrq.o
+drm-$(CONFIG_COMPAT) += drm_ioc32.o
+drm-$(CONFIG_DRM_PANEL) += drm_panel.o
+drm-$(CONFIG_OF) += drm_of.o
+drm-$(CONFIG_PCI) += drm_pci.o
+drm-$(CONFIG_DEBUG_FS) += \
+	drm_debugfs.o \
+	drm_debugfs_crc.o
+drm-$(CONFIG_DRM_LOAD_EDID_FIRMWARE) += drm_edid_load.o
+drm-$(CONFIG_DRM_PRIVACY_SCREEN) += \
+	drm_privacy_screen.o \
+	drm_privacy_screen_x86.o
+drm-$(CONFIG_DRM_ACCEL) += ../../accel/drm_accel.o
+drm-$(CONFIG_DRM_PANIC) += drm_panic.o
+drm-$(CONFIG_DRM_DRAW) += drm_draw.o
+drm-$(CONFIG_DRM_PANIC_SCREEN_QR_CODE) += drm_panic_qr.o
+drm-$(CONFIG_DRM_RAS) += drm_ras.o drm_ras_nl.o drm_ras_genl_family.o
+obj-$(CONFIG_DRM)	+= drm.o
+
+obj-$(CONFIG_DRM_PANEL_ORIENTATION_QUIRKS) += drm_panel_orientation_quirks.o
+obj-$(CONFIG_DRM_PANEL_BACKLIGHT_QUIRKS) += drm_panel_backlight_quirks.o
+
+#
+# Memory-management helpers
+#
+#
+obj-$(CONFIG_DRM_EXEC) += drm_exec.o
+obj-$(CONFIG_DRM_GPUVM) += drm_gpuvm.o
+
+drm_gpusvm_helper-y := \
+	drm_gpusvm.o
+drm_gpusvm_helper-$(CONFIG_ZONE_DEVICE) += \
+	drm_pagemap.o\
+	drm_pagemap_util.o
+
+obj-$(CONFIG_DRM_GPUSVM) += drm_gpusvm_helper.o
+
+obj-$(CONFIG_DRM_BUDDY) += drm_buddy.o
+
+drm_dma_helper-y := drm_gem_dma_helper.o
+drm_dma_helper-$(CONFIG_DRM_FBDEV_EMULATION) += drm_fbdev_dma.o
+drm_dma_helper-$(CONFIG_DRM_KMS_HELPER) += drm_fb_dma_helper.o
+obj-$(CONFIG_DRM_GEM_DMA_HELPER) += drm_dma_helper.o
+
+drm_shmem_helper-y := drm_gem_shmem_helper.o
+drm_shmem_helper-$(CONFIG_DRM_FBDEV_EMULATION) += drm_fbdev_shmem.o
+obj-$(CONFIG_DRM_GEM_SHMEM_HELPER) += drm_shmem_helper.o
+
+drm_suballoc_helper-y := drm_suballoc.o
+obj-$(CONFIG_DRM_SUBALLOC_HELPER) += drm_suballoc_helper.o
+
+drm_vram_helper-y := drm_gem_vram_helper.o
+obj-$(CONFIG_DRM_VRAM_HELPER) += drm_vram_helper.o
+
+drm_ttm_helper-y := drm_gem_ttm_helper.o
+drm_ttm_helper-$(CONFIG_DRM_FBDEV_EMULATION) += drm_fbdev_ttm.o
+obj-$(CONFIG_DRM_TTM_HELPER) += drm_ttm_helper.o
+
+#
+# Modesetting helpers
+#
+
+drm_kms_helper-y := \
+	drm_atomic_helper.o \
+	drm_atomic_state_helper.o \
+	drm_bridge_helper.o \
+	drm_crtc_helper.o \
+	drm_damage_helper.o \
+	drm_flip_work.o \
+	drm_format_helper.o \
+	drm_gem_atomic_helper.o \
+	drm_gem_framebuffer_helper.o \
+	drm_kms_helper_common.o \
+	drm_modeset_helper.o \
+	drm_plane_helper.o \
+	drm_probe_helper.o \
+	drm_self_refresh_helper.o \
+	drm_simple_kms_helper.o \
+	drm_vblank_helper.o
+drm_kms_helper-$(CONFIG_DRM_PANEL_BRIDGE) += bridge/panel.o
+drm_kms_helper-$(CONFIG_DRM_FBDEV_EMULATION) += drm_fb_helper.o
+obj-$(CONFIG_DRM_KMS_HELPER) += drm_kms_helper.o
+
+#
+# Drivers and the rest
+#
+
+obj-y			+= tests/
+
+obj-$(CONFIG_DRM_MIPI_DBI) += drm_mipi_dbi.o
+obj-$(CONFIG_DRM_MIPI_DSI) += drm_mipi_dsi.o
+obj-y			+= arm/
+obj-y			+= clients/
+obj-y			+= display/
+obj-$(CONFIG_DRM_TTM)	+= ttm/
+obj-$(CONFIG_DRM_SCHED)	+= scheduler/
+obj-$(CONFIG_DRM_RADEON)+= radeon/
+obj-$(CONFIG_DRM_AMDGPU)+= amd/amdgpu/
+obj-$(CONFIG_DRM_AMDGPU)+= amd/amdxcp/
+obj-$(CONFIG_DRM_I915)	+= i915/
+obj-$(CONFIG_DRM_XE)	+= xe/
+obj-$(CONFIG_DRM_KMB_DISPLAY)  += kmb/
+obj-$(CONFIG_DRM_MGAG200) += mgag200/
+obj-$(CONFIG_DRM_V3D)  += v3d/
+obj-$(CONFIG_DRM_VC4)  += vc4/
+obj-$(CONFIG_DRM_VMWGFX)+= vmwgfx/
+obj-$(CONFIG_DRM_VGEM)	+= vgem/
+obj-$(CONFIG_DRM_VKMS)	+= vkms/
+obj-$(CONFIG_DRM_NOUVEAU) +=nouveau/
+obj-$(CONFIG_DRM_NOVA) += nova/
+obj-$(CONFIG_DRM_EXYNOS) +=exynos/
+obj-$(CONFIG_DRM_ROCKCHIP) +=rockchip/
+obj-$(CONFIG_DRM_GMA500) += gma500/
+obj-$(CONFIG_DRM_UDL) += udl/
+obj-$(CONFIG_DRM_AST) += ast/
+obj-$(CONFIG_DRM_ARMADA) += armada/
+obj-$(CONFIG_DRM_ATMEL_HLCDC)	+= atmel-hlcdc/
+obj-y			+= renesas/
+obj-y			+= omapdrm/
+obj-$(CONFIG_DRM_SUN4I) += sun4i/
+obj-y			+= tilcdc/
+obj-$(CONFIG_DRM_QXL) += qxl/
+obj-$(CONFIG_DRM_VIRTIO_GPU) += virtio/
+obj-$(CONFIG_DRM_MSM) += msm/
+obj-$(CONFIG_DRM_TEGRA) += tegra/
+obj-$(CONFIG_DRM_STM) += stm/
+obj-$(CONFIG_DRM_STI) += sti/
+obj-y 			+= imx/
+obj-$(CONFIG_DRM_INGENIC) += ingenic/
+obj-$(CONFIG_DRM_LOGICVC) += logicvc/
+obj-$(CONFIG_DRM_MEDIATEK) += mediatek/
+obj-$(CONFIG_DRM_MESON)	+= meson/
+obj-y			+= panel/
+obj-y			+= bridge/
+obj-$(CONFIG_DRM_FSL_DCU) += fsl-dcu/
+obj-$(CONFIG_DRM_ETNAVIV) += etnaviv/
+obj-y			+= hisilicon/
+obj-y			+= mxsfb/
+obj-y			+= sysfb/
+obj-y			+= tiny/
+obj-$(CONFIG_DRM_PL111) += pl111/
+obj-$(CONFIG_DRM_TVE200) += tve200/
+obj-$(CONFIG_DRM_ADP) += adp/
+obj-$(CONFIG_DRM_XEN) += xen/
+obj-$(CONFIG_DRM_VBOXVIDEO) += vboxvideo/
+obj-$(CONFIG_DRM_LIMA)  += lima/
+obj-$(CONFIG_DRM_PANFROST) += panfrost/
+obj-$(CONFIG_DRM_PANTHOR) += panthor/
+obj-$(CONFIG_DRM_TYR) += tyr/
+obj-$(CONFIG_DRM_ASPEED_GFX) += aspeed/
+obj-$(CONFIG_DRM_MCDE) += mcde/
+obj-$(CONFIG_DRM_TIDSS) += tidss/
+obj-y			+= xlnx/
+obj-y			+= gud/
+obj-$(CONFIG_DRM_HYPERV) += hyperv/
+obj-y			+= sitronix/
+obj-y			+= solomon/
+obj-$(CONFIG_DRM_SPRD) += sprd/
+obj-$(CONFIG_DRM_LOONGSON) += loongson/
+obj-$(CONFIG_DRM_POWERVR) += imagination/
+obj-$(CONFIG_DRM_VERISILICON_DC) += verisilicon/
+
+# Ensure drm headers are self-contained and pass kernel-doc
+hdrtest-files := \
+	$(shell cd $(src) && find . -maxdepth 1 -name 'drm_*.h') \
+	$(shell cd $(src) && find display -name '*.h')
+
+always-$(CONFIG_DRM_HEADER_TEST) += \
+	$(patsubst %.h,%.hdrtest, $(hdrtest-files))
+
+# Include the header twice to detect missing include guard.
+quiet_cmd_hdrtest = HDRTEST $(patsubst %.hdrtest,%.h,$@)
+      cmd_hdrtest = \
+		$(CC) $(c_flags) -fsyntax-only -x c /dev/null -include $< -include $<; \
+		 PYTHONDONTWRITEBYTECODE=1 $(PYTHON3) $(KERNELDOC) -none $(if $(CONFIG_WERROR)$(CONFIG_DRM_WERROR),-Werror) $<; \
+		touch $@
+
+$(obj)/%.hdrtest: $(src)/%.h FORCE
+	$(call if_changed_dep,hdrtest)