Message-ID: <2023070502-carpenter-danger-b863@gregkh>
Date:   Wed,  5 Jul 2023 18:54:02 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
        torvalds@...ux-foundation.org, stable@...r.kernel.org
Cc:     lwn@....net, jslaby@...e.cz,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: Linux 6.1.38

diff --git a/Documentation/process/changes.rst b/Documentation/process/changes.rst
index 9844ca3a71a6..c76b02d94094 100644
--- a/Documentation/process/changes.rst
+++ b/Documentation/process/changes.rst
@@ -60,6 +60,7 @@ openssl & libcrypto    1.0.0            openssl version
 bc                     1.06.95          bc --version
 Sphinx\ [#f1]_         1.7              sphinx-build --version
 cpio                   any              cpio --version
+gtags (optional)       6.6.5            gtags --version
 ====================== ===============  ========================================
 
 .. [#f1] Sphinx is needed only to build the Kernel documentation
@@ -174,6 +175,12 @@ You will need openssl to build kernels 3.7 and higher if module signing is
 enabled.  You will also need openssl development packages to build kernels 4.3
 and higher.
 
+gtags / GNU GLOBAL (optional)
+-----------------------------
+
+The kernel build requires GNU GLOBAL version 6.6.5 or later to generate
+tag files through ``make gtags``.  This is due to its use of the gtags
+``-C (--directory)`` flag.
 
 System utilities
 ****************
diff --git a/Makefile b/Makefile
index 26d73ce7e926..57c891b8b13c 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0
 VERSION = 6
 PATCHLEVEL = 1
-SUBLEVEL = 37
+SUBLEVEL = 38
 EXTRAVERSION =
 NAME = Curry Ramen
 
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 003aa9e47085..5a8a4cda7e98 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -2363,6 +2363,10 @@ int amdgpu_vm_ioctl(struct drm_device *dev, void *data, struct drm_file *filp)
 	long timeout = msecs_to_jiffies(2000);
 	int r;
 
+	/* No valid flags defined yet */
+	if (args->in.flags)
+		return -EINVAL;
+
 	switch (args->in.op) {
 	case AMDGPU_VM_OP_RESERVE_VMID:
 		/* We only have requirement to reserve vmid from gfxhub */
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index af7aefe285ff..087a4838488b 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -401,8 +401,13 @@ bool dc_stream_adjust_vmin_vmax(struct dc *dc,
 {
 	int i;
 
-	if (memcmp(adjust, &stream->adjust, sizeof(struct dc_crtc_timing_adjust)) == 0)
-		return true;
+	/*
+	 * Don't adjust DRR while there's bandwidth optimizations pending to
+	 * avoid conflicting with firmware updates.
+	 */
+	if (dc->ctx->dce_version > DCE_VERSION_MAX)
+		if (dc->optimized_required || dc->wm_optimized_required)
+			return false;
 
 	stream->adjust.v_total_max = adjust->v_total_max;
 	stream->adjust.v_total_mid = adjust->v_total_mid;
@@ -2024,27 +2029,33 @@ void dc_post_update_surfaces_to_stream(struct dc *dc)
 
 	post_surface_trace(dc);
 
-	if (dc->ctx->dce_version >= DCE_VERSION_MAX)
-		TRACE_DCN_CLOCK_STATE(&context->bw_ctx.bw.dcn.clk);
-	else
+	/*
+	 * Only relevant for DCN behavior where we can guarantee the optimization
+	 * is safe to apply - retain the legacy behavior for DCE.
+	 */
+
+	if (dc->ctx->dce_version < DCE_VERSION_MAX)
 		TRACE_DCE_CLOCK_STATE(&context->bw_ctx.bw.dce);
+	else {
+		TRACE_DCN_CLOCK_STATE(&context->bw_ctx.bw.dcn.clk);
 
-	if (is_flip_pending_in_pipes(dc, context))
-		return;
+		if (is_flip_pending_in_pipes(dc, context))
+			return;
 
-	for (i = 0; i < dc->res_pool->pipe_count; i++)
-		if (context->res_ctx.pipe_ctx[i].stream == NULL ||
-		    context->res_ctx.pipe_ctx[i].plane_state == NULL) {
-			context->res_ctx.pipe_ctx[i].pipe_idx = i;
-			dc->hwss.disable_plane(dc, &context->res_ctx.pipe_ctx[i]);
-		}
+		for (i = 0; i < dc->res_pool->pipe_count; i++)
+			if (context->res_ctx.pipe_ctx[i].stream == NULL ||
+					context->res_ctx.pipe_ctx[i].plane_state == NULL) {
+				context->res_ctx.pipe_ctx[i].pipe_idx = i;
+				dc->hwss.disable_plane(dc, &context->res_ctx.pipe_ctx[i]);
+			}
 
-	process_deferred_updates(dc);
+		process_deferred_updates(dc);
 
-	dc->hwss.optimize_bandwidth(dc, context);
+		dc->hwss.optimize_bandwidth(dc, context);
 
-	if (dc->debug.enable_double_buffered_dsc_pg_support)
-		dc->hwss.update_dsc_pg(dc, context, true);
+		if (dc->debug.enable_double_buffered_dsc_pg_support)
+			dc->hwss.update_dsc_pg(dc, context, true);
+	}
 
 	dc->optimized_required = false;
 	dc->wm_optimized_required = false;
@@ -3869,12 +3880,9 @@ void dc_commit_updates_for_stream(struct dc *dc,
 			if (new_pipe->plane_state && new_pipe->plane_state != old_pipe->plane_state)
 				new_pipe->plane_state->force_full_update = true;
 		}
-	} else if (update_type == UPDATE_TYPE_FAST && dc_ctx->dce_version >= DCE_VERSION_MAX) {
+	} else if (update_type == UPDATE_TYPE_FAST) {
 		/*
 		 * Previous frame finished and HW is ready for optimization.
-		 *
-		 * Only relevant for DCN behavior where we can guarantee the optimization
-		 * is safe to apply - retain the legacy behavior for DCE.
 		 */
 		dc_post_update_surfaces_to_stream(dc);
 	}
diff --git a/drivers/nubus/proc.c b/drivers/nubus/proc.c
index 1fd667852271..cd4bd06cf309 100644
--- a/drivers/nubus/proc.c
+++ b/drivers/nubus/proc.c
@@ -137,6 +137,18 @@ static int nubus_proc_rsrc_show(struct seq_file *m, void *v)
 	return 0;
 }
 
+static int nubus_rsrc_proc_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, nubus_proc_rsrc_show, inode);
+}
+
+static const struct proc_ops nubus_rsrc_proc_ops = {
+	.proc_open	= nubus_rsrc_proc_open,
+	.proc_read	= seq_read,
+	.proc_lseek	= seq_lseek,
+	.proc_release	= single_release,
+};
+
 void nubus_proc_add_rsrc_mem(struct proc_dir_entry *procdir,
 			     const struct nubus_dirent *ent,
 			     unsigned int size)
@@ -152,8 +164,8 @@ void nubus_proc_add_rsrc_mem(struct proc_dir_entry *procdir,
 		pded = nubus_proc_alloc_pde_data(nubus_dirptr(ent), size);
 	else
 		pded = NULL;
-	proc_create_single_data(name, S_IFREG | 0444, procdir,
-			nubus_proc_rsrc_show, pded);
+	proc_create_data(name, S_IFREG | 0444, procdir,
+			 &nubus_rsrc_proc_ops, pded);
 }
 
 void nubus_proc_add_rsrc(struct proc_dir_entry *procdir,
@@ -166,9 +178,9 @@ void nubus_proc_add_rsrc(struct proc_dir_entry *procdir,
 		return;
 
 	snprintf(name, sizeof(name), "%x", ent->type);
-	proc_create_single_data(name, S_IFREG | 0444, procdir,
-			nubus_proc_rsrc_show,
-			nubus_proc_alloc_pde_data(data, 0));
+	proc_create_data(name, S_IFREG | 0444, procdir,
+			 &nubus_rsrc_proc_ops,
+			 nubus_proc_alloc_pde_data(data, 0));
 }
 
 /*
diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
index 1698205dd73c..7aa1c20582ab 100644
--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -1043,6 +1043,16 @@ bool acpi_pci_bridge_d3(struct pci_dev *dev)
 	return false;
 }
 
+static void acpi_pci_config_space_access(struct pci_dev *dev, bool enable)
+{
+	int val = enable ? ACPI_REG_CONNECT : ACPI_REG_DISCONNECT;
+	int ret = acpi_evaluate_reg(ACPI_HANDLE(&dev->dev),
+				    ACPI_ADR_SPACE_PCI_CONFIG, val);
+	if (ret)
+		pci_dbg(dev, "ACPI _REG %s evaluation failed (%d)\n",
+			enable ? "connect" : "disconnect", ret);
+}
+
 int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
 {
 	struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
@@ -1053,32 +1063,49 @@ int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
 		[PCI_D3hot] = ACPI_STATE_D3_HOT,
 		[PCI_D3cold] = ACPI_STATE_D3_COLD,
 	};
-	int error = -EINVAL;
+	int error;
 
 	/* If the ACPI device has _EJ0, ignore the device */
 	if (!adev || acpi_has_method(adev->handle, "_EJ0"))
 		return -ENODEV;
 
 	switch (state) {
-	case PCI_D3cold:
-		if (dev_pm_qos_flags(&dev->dev, PM_QOS_FLAG_NO_POWER_OFF) ==
-				PM_QOS_FLAGS_ALL) {
-			error = -EBUSY;
-			break;
-		}
-		fallthrough;
 	case PCI_D0:
 	case PCI_D1:
 	case PCI_D2:
 	case PCI_D3hot:
-		error = acpi_device_set_power(adev, state_conv[state]);
+	case PCI_D3cold:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	if (state == PCI_D3cold) {
+		if (dev_pm_qos_flags(&dev->dev, PM_QOS_FLAG_NO_POWER_OFF) ==
+				PM_QOS_FLAGS_ALL)
+			return -EBUSY;
+
+		/* Notify AML lack of PCI config space availability */
+		acpi_pci_config_space_access(dev, false);
 	}
 
-	if (!error)
-		pci_dbg(dev, "power state changed by ACPI to %s\n",
-		        acpi_power_state_string(adev->power.state));
+	error = acpi_device_set_power(adev, state_conv[state]);
+	if (error)
+		return error;
 
-	return error;
+	pci_dbg(dev, "power state changed by ACPI to %s\n",
+	        acpi_power_state_string(adev->power.state));
+
+	/*
+	 * Notify AML of PCI config space availability.  Config space is
+	 * accessible in all states except D3cold; the only transitions
+	 * that change availability are transitions to D3cold and from
+	 * D3cold to D0.
+	 */
+	if (state == PCI_D0)
+		acpi_pci_config_space_access(dev, true);
+
+	return 0;
 }
 
 pci_power_t acpi_pci_get_power_state(struct pci_dev *dev)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index f5b6ef943ede..b8ed44f401b5 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -378,7 +378,7 @@ extern unsigned int kobjsize(const void *objp);
 #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_MINOR */
 
 /* Bits set in the VMA until the stack is in its final location */
-#define VM_STACK_INCOMPLETE_SETUP	(VM_RAND_READ | VM_SEQ_READ)
+#define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ | VM_STACK_EARLY)
 
 #define TASK_EXEC ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0)
 
@@ -400,8 +400,10 @@ extern unsigned int kobjsize(const void *objp);
 
 #ifdef CONFIG_STACK_GROWSUP
 #define VM_STACK	VM_GROWSUP
+#define VM_STACK_EARLY	VM_GROWSDOWN
 #else
 #define VM_STACK	VM_GROWSDOWN
+#define VM_STACK_EARLY	0
 #endif
 
 #define VM_STACK_FLAGS	(VM_STACK | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
diff --git a/mm/nommu.c b/mm/nommu.c
index da26b3fec9eb..8e8fe491d914 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -688,8 +688,13 @@ EXPORT_SYMBOL(find_vma);
 struct vm_area_struct *lock_mm_and_find_vma(struct mm_struct *mm,
 			unsigned long addr, struct pt_regs *regs)
 {
+	struct vm_area_struct *vma;
+
 	mmap_read_lock(mm);
-	return vma_lookup(mm, addr);
+	vma = vma_lookup(mm, addr);
+	if (!vma)
+		mmap_read_unlock(mm);
+	return vma;
 }
 
 /*
diff --git a/scripts/tags.sh b/scripts/tags.sh
index 0d045182c08c..f23b9b7ed015 100755
--- a/scripts/tags.sh
+++ b/scripts/tags.sh
@@ -25,6 +25,13 @@ else
 	tree=${srctree}/
 fi
 
+# gtags(1) refuses to index any file outside of its current working dir.
+# If gtags indexing is requested and the build output directory is not
+# the kernel source tree, index all files in absolute-path form.
+if [[ "$1" == "gtags" && -n "${tree}" ]]; then
+	tree=$(realpath "$tree")/
+fi
+
 # Detect if ALLSOURCE_ARCHS is set. If not, we assume SRCARCH
 if [ "${ALLSOURCE_ARCHS}" = "" ]; then
 	ALLSOURCE_ARCHS=${SRCARCH}
@@ -124,7 +131,7 @@ docscope()
 
 dogtags()
 {
-	all_target_sources | gtags -i -f -
+	all_target_sources | gtags -i -C "${tree:-.}" -f - "$PWD"
 }
 
 # Basic regular expressions with an optional /kind-spec/ for ctags and
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index a3a165ae933a..98014f937568 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1368,10 +1368,23 @@ static int dso__load_kcore(struct dso *dso, struct map *map,
 
 	/* Find the kernel map using the '_stext' symbol */
 	if (!kallsyms__get_function_start(kallsyms_filename, "_stext", &stext)) {
+		u64 replacement_size = 0;
+
 		list_for_each_entry(new_map, &md.maps, node) {
-			if (stext >= new_map->start && stext < new_map->end) {
+			u64 new_size = new_map->end - new_map->start;
+
+			if (!(stext >= new_map->start && stext < new_map->end))
+				continue;
+
+			/*
+			 * On some architectures, ARM64 for example, the kernel
+			 * text can get allocated inside of the vmalloc segment.
+			 * Select the smallest matching segment, in case stext
+			 * falls within more than one in the list.
+			 */
+			if (!replacement_map || new_size < replacement_size) {
 				replacement_map = new_map;
-				break;
+				replacement_size = new_size;
 			}
 		}
 	}

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