Merge tag 'driver-core-5.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core/kobject updates from Greg KH:
 "Here is the "big" set of driver core patches for 5.2-rc1

  There are a number of ACPI patches in here as well, as Rafael said
  they should go through this tree due to the driver core changes they
  required. They have all been acked by the ACPI developers.

  There are also a number of small subsystem-specific changes in here,
  due to some changes to the kobject core code. Those too have all been
  acked by the various subsystem maintainers.

  As for content, it's pretty boring outside of the ACPI changes:
   - spdx cleanups
   - kobject documentation updates
   - default attribute groups for kobjects
   - other minor kobject/driver core fixes

  All have been in linux-next for a while with no reported issues"

* tag 'driver-core-5.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (47 commits)
  kobject: clean up the kobject add documentation a bit more
  kobject: Fix kernel-doc comment first line
  kobject: Remove docstring reference to kset
  firmware_loader: Fix a typo ("syfs" -> "sysfs")
  kobject: fix dereference before null check on kobj
  Revert "driver core: platform: Fix the usage of platform device name(pdev->name)"
  init/config: Do not select BUILD_BIN2C for IKCONFIG
  Provide in-kernel headers to make extending kernel easier
  kobject: Improve doc clarity kobject_init_and_add()
  kobject: Improve docs for kobject_add/del
  driver core: platform: Fix the usage of platform device name(pdev->name)
  livepatch: Replace klp_ktype_patch's default_attrs with groups
  cpufreq: schedutil: Replace default_attrs field with groups
  padata: Replace padata_attr_type default_attrs field with groups
  irqdesc: Replace irq_kobj_type's default_attrs field with groups
  net-sysfs: Replace ktype default_attrs field with groups
  block: Replace all ktype default_attrs with groups
  samples/kobject: Replace foo_ktype's default_attrs field with groups
  kobject: Add support for default attribute groups to kobj_type
  driver core: Postpone DMA tear-down until after devres release for probe failure
  ...

8 files changed, 183 insertions, 5 deletions

diff --git a/kernel/.gitignore b/kernel/.gitignore
index 6e699100872f..34d1e77ee9df 100644
--- a/kernel/.gitignore
+++ b/kernel/.gitignore
@@ -1,5 +1,6 @@
 #
 # Generated files
 #
+kheaders.md5
 timeconst.h
 hz.bc
diff --git a/kernel/Makefile b/kernel/Makefile
index 62471e75a2b0..298437bb2c6a 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -71,6 +71,7 @@ obj-$(CONFIG_UTS_NS) += utsname.o
 obj-$(CONFIG_USER_NS) += user_namespace.o
 obj-$(CONFIG_PID_NS) += pid_namespace.o
 obj-$(CONFIG_IKCONFIG) += configs.o
+obj-$(CONFIG_IKHEADERS_PROC) += kheaders.o
 obj-$(CONFIG_SMP) += stop_machine.o
 obj-$(CONFIG_KPROBES_SANITY_TEST) += test_kprobes.o
 obj-$(CONFIG_AUDIT) += audit.o auditfilter.o
@@ -122,3 +123,12 @@ $(obj)/configs.o: $(obj)/config_data.gz
 targets += config_data.gz
 $(obj)/config_data.gz: $(KCONFIG_CONFIG) FORCE
 	$(call if_changed,gzip)
+
+$(obj)/kheaders.o: $(obj)/kheaders_data.tar.xz
+
+quiet_cmd_genikh = CHK     $(obj)/kheaders_data.tar.xz
+cmd_genikh = $(srctree)/kernel/gen_ikh_data.sh $@
+$(obj)/kheaders_data.tar.xz: FORCE
+	$(call cmd,genikh)
+
+clean-files := kheaders_data.tar.xz kheaders.md5
diff --git a/kernel/gen_ikh_data.sh b/kernel/gen_ikh_data.sh
new file mode 100755
index 000000000000..591a94f7b387
--- /dev/null
+++ b/kernel/gen_ikh_data.sh
@@ -0,0 +1,89 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+# This script generates an archive consisting of kernel headers
+# for CONFIG_IKHEADERS_PROC.
+set -e
+spath="$(dirname "$(readlink -f "$0")")"
+kroot="$spath/.."
+outdir="$(pwd)"
+tarfile=$1
+cpio_dir=$outdir/$tarfile.tmp
+
+# Script filename relative to the kernel source root
+# We add it to the archive because it is small and any changes
+# to this script will also cause a rebuild of the archive.
+sfile="$(realpath --relative-to $kroot "$(readlink -f "$0")")"
+
+src_file_list="
+include/
+arch/$SRCARCH/include/
+$sfile
+"
+
+obj_file_list="
+include/
+arch/$SRCARCH/include/
+"
+
+# Support incremental builds by skipping archive generation
+# if timestamps of files being archived are not changed.
+
+# This block is useful for debugging the incremental builds.
+# Uncomment it for debugging.
+# iter=1
+# if [ ! -f /tmp/iter ]; then echo 1 > /tmp/iter;
+# else; 	iter=$(($(cat /tmp/iter) + 1)); fi
+# find $src_file_list -type f | xargs ls -lR > /tmp/src-ls-$iter
+# find $obj_file_list -type f | xargs ls -lR > /tmp/obj-ls-$iter
+
+# include/generated/compile.h is ignored because it is touched even when none
+# of the source files changed. This causes pointless regeneration, so let us
+# ignore them for md5 calculation.
+pushd $kroot > /dev/null
+src_files_md5="$(find $src_file_list -type f                       |
+		grep -v "include/generated/compile.h"		   |
+		xargs ls -lR | md5sum | cut -d ' ' -f1)"
+popd > /dev/null
+obj_files_md5="$(find $obj_file_list -type f                       |
+		grep -v "include/generated/compile.h"		   |
+		xargs ls -lR | md5sum | cut -d ' ' -f1)"
+
+if [ -f $tarfile ]; then tarfile_md5="$(md5sum $tarfile | cut -d ' ' -f1)"; fi
+if [ -f kernel/kheaders.md5 ] &&
+	[ "$(cat kernel/kheaders.md5|head -1)" == "$src_files_md5" ] &&
+	[ "$(cat kernel/kheaders.md5|head -2|tail -1)" == "$obj_files_md5" ] &&
+	[ "$(cat kernel/kheaders.md5|tail -1)" == "$tarfile_md5" ]; then
+		exit
+fi
+
+if [ "${quiet}" != "silent_" ]; then
+       echo "  GEN     $tarfile"
+fi
+
+rm -rf $cpio_dir
+mkdir $cpio_dir
+
+pushd $kroot > /dev/null
+for f in $src_file_list;
+	do find "$f" ! -name "*.cmd" ! -name ".*";
+done | cpio --quiet -pd $cpio_dir
+popd > /dev/null
+
+# The second CPIO can complain if files already exist which can
+# happen with out of tree builds. Just silence CPIO for now.
+for f in $obj_file_list;
+	do find "$f" ! -name "*.cmd" ! -name ".*";
+done | cpio --quiet -pd $cpio_dir >/dev/null 2>&1
+
+# Remove comments except SDPX lines
+find $cpio_dir -type f -print0 |
+	xargs -0 -P8 -n1 perl -pi -e 'BEGIN {undef $/;}; s/\/\*((?!SPDX).)*?\*\///smg;'
+
+tar -Jcf $tarfile -C $cpio_dir/ . > /dev/null
+
+echo "$src_files_md5" > kernel/kheaders.md5
+echo "$obj_files_md5" >> kernel/kheaders.md5
+echo "$(md5sum $tarfile | cut -d ' ' -f1)" >> kernel/kheaders.md5
+
+rm -rf $cpio_dir
diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c
index 9f8a709337cf..c52b737ab8e3 100644
--- a/kernel/irq/irqdesc.c
+++ b/kernel/irq/irqdesc.c
@@ -275,11 +275,12 @@ static struct attribute *irq_attrs[] = {
 	&actions_attr.attr,
 	NULL
 };
+ATTRIBUTE_GROUPS(irq);
 
 static struct kobj_type irq_kobj_type = {
 	.release	= irq_kobj_release,
 	.sysfs_ops	= &kobj_sysfs_ops,
-	.default_attrs	= irq_attrs,
+	.default_groups = irq_groups,
 };
 
 static void irq_sysfs_add(int irq, struct irq_desc *desc)
diff --git a/kernel/kheaders.c b/kernel/kheaders.c
new file mode 100644
index 000000000000..70ae6052920d
--- /dev/null
+++ b/kernel/kheaders.c
@@ -0,0 +1,74 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Provide kernel headers useful to build tracing programs
+ * such as for running eBPF tracing tools.
+ *
+ * (Borrowed code from kernel/configs.c)
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/proc_fs.h>
+#include <linux/init.h>
+#include <linux/uaccess.h>
+
+/*
+ * Define kernel_headers_data and kernel_headers_data_end, within which the
+ * compressed kernel headers are stored. The file is first compressed with xz.
+ */
+
+asm (
+"	.pushsection .rodata, \"a\"		\n"
+"	.global kernel_headers_data		\n"
+"kernel_headers_data:				\n"
+"	.incbin \"kernel/kheaders_data.tar.xz\"	\n"
+"	.global kernel_headers_data_end		\n"
+"kernel_headers_data_end:			\n"
+"	.popsection				\n"
+);
+
+extern char kernel_headers_data;
+extern char kernel_headers_data_end;
+
+static ssize_t
+ikheaders_read_current(struct file *file, char __user *buf,
+		      size_t len, loff_t *offset)
+{
+	return simple_read_from_buffer(buf, len, offset,
+				       &kernel_headers_data,
+				       &kernel_headers_data_end -
+				       &kernel_headers_data);
+}
+
+static const struct file_operations ikheaders_file_ops = {
+	.read = ikheaders_read_current,
+	.llseek = default_llseek,
+};
+
+static int __init ikheaders_init(void)
+{
+	struct proc_dir_entry *entry;
+
+	/* create the current headers file */
+	entry = proc_create("kheaders.tar.xz", S_IRUGO, NULL,
+			    &ikheaders_file_ops);
+	if (!entry)
+		return -ENOMEM;
+
+	proc_set_size(entry,
+		      &kernel_headers_data_end -
+		      &kernel_headers_data);
+	return 0;
+}
+
+static void __exit ikheaders_cleanup(void)
+{
+	remove_proc_entry("kheaders.tar.xz", NULL);
+}
+
+module_init(ikheaders_init);
+module_exit(ikheaders_cleanup);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Joel Fernandes");
+MODULE_DESCRIPTION("Echo the kernel header artifacts used to build the kernel");
diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
index f12c0eabd843..f6fbaff10e71 100644
--- a/kernel/livepatch/core.c
+++ b/kernel/livepatch/core.c
@@ -419,6 +419,7 @@ static struct attribute *klp_patch_attrs[] = {
 	&force_kobj_attr.attr,
 	NULL
 };
+ATTRIBUTE_GROUPS(klp_patch);
 
 static void klp_free_object_dynamic(struct klp_object *obj)
 {
@@ -549,7 +550,7 @@ static void klp_kobj_release_patch(struct kobject *kobj)
 static struct kobj_type klp_ktype_patch = {
 	.release = klp_kobj_release_patch,
 	.sysfs_ops = &kobj_sysfs_ops,
-	.default_attrs = klp_patch_attrs,
+	.default_groups = klp_patch_groups,
 };
 
 static void klp_kobj_release_object(struct kobject *kobj)
diff --git a/kernel/padata.c b/kernel/padata.c
index 3e2633ae3bca..2d2fddbb7a4c 100644
--- a/kernel/padata.c
+++ b/kernel/padata.c
@@ -957,6 +957,7 @@ static struct attribute *padata_default_attrs[] = {
 	&parallel_cpumask_attr.attr,
 	NULL,
 };
+ATTRIBUTE_GROUPS(padata_default);
 
 static ssize_t padata_sysfs_show(struct kobject *kobj,
 				 struct attribute *attr, char *buf)
@@ -995,7 +996,7 @@ static const struct sysfs_ops padata_sysfs_ops = {
 
 static struct kobj_type padata_attr_type = {
 	.sysfs_ops = &padata_sysfs_ops,
-	.default_attrs = padata_default_attrs,
+	.default_groups = padata_default_groups,
 	.release = padata_sysfs_release,
 };
 
diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c
index 5403479073b0..962cf343f798 100644
--- a/kernel/sched/cpufreq_schedutil.c
+++ b/kernel/sched/cpufreq_schedutil.c
@@ -600,13 +600,14 @@ rate_limit_us_store(struct gov_attr_set *attr_set, const char *buf, size_t count
 
 static struct governor_attr rate_limit_us = __ATTR_RW(rate_limit_us);
 
-static struct attribute *sugov_attributes[] = {
+static struct attribute *sugov_attrs[] = {
 	&rate_limit_us.attr,
 	NULL
 };
+ATTRIBUTE_GROUPS(sugov);
 
 static struct kobj_type sugov_tunables_ktype = {
-	.default_attrs = sugov_attributes,
+	.default_groups = sugov_groups,
 	.sysfs_ops = &governor_sysfs_ops,
 };