Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf

Cross-merge bpf fixes after downstream PR.

No conflicts.

Adjacent changes in:

include/linux/bpf.h
include/uapi/linux/bpf.h
kernel/bpf/btf.c
kernel/bpf/helpers.c
kernel/bpf/syscall.c
kernel/bpf/verifier.c
kernel/trace/bpf_trace.c
mm/slab_common.c
tools/include/uapi/linux/bpf.h
tools/testing/selftests/bpf/Makefile

Link: https://lore.kernel.org/all/20241024215724.60017-1-daniel@iogearbox.net/
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

scripts/Kconfig.include

@@ -65,6 +65,9 @@ cc-option-bit = $(if-success,$(CC) -Werror $(1) -E -x c /dev/null -o /dev/null,$
 m32-flag := $(cc-option-bit,-m32)
 m64-flag := $(cc-option-bit,-m64)
 
+rustc-version := $(shell,$(srctree)/scripts/rustc-version.sh $(RUSTC))
+rustc-llvm-version := $(shell,$(srctree)/scripts/rustc-llvm-version.sh $(RUSTC))
+
 # $(rustc-option,<flag>)
 # Return y if the Rust compiler supports <flag>, n otherwise
 # Calls to this should be guarded so that they are not evaluated if

scripts/Makefile.compiler

@@ -53,13 +53,11 @@ cc-option = $(call __cc-option, $(CC),\
 
 # cc-option-yn
 # Usage: flag := $(call cc-option-yn,-march=winchip-c6)
-cc-option-yn = $(call try-run,\
-	$(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n)
+cc-option-yn = $(if $(call cc-option,$1),y,n)
 
 # cc-disable-warning
 # Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
-cc-disable-warning = $(call try-run,\
-	$(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
+cc-disable-warning = $(if $(call cc-option,-W$(strip $1)),-Wno-$(strip $1))
 
 # gcc-min-version
 # Usage: cflags-$(call gcc-min-version, 70100) += -foo
@@ -75,8 +73,11 @@ ld-option = $(call try-run, $(LD) $(KBUILD_LDFLAGS) $(1) -v,$(1),$(2),$(3))
 
 # __rustc-option
 # Usage: MY_RUSTFLAGS += $(call __rustc-option,$(RUSTC),$(MY_RUSTFLAGS),-Cinstrument-coverage,-Zinstrument-coverage)
+# TODO: remove RUSTC_BOOTSTRAP=1 when we raise the minimum GNU Make version to 4.4
 __rustc-option = $(call try-run,\
-	$(1) $(2) $(3) --crate-type=rlib /dev/null --out-dir=$$TMPOUT -o "$$TMP",$(3),$(4))
+	echo '#![allow(missing_docs)]#![feature(no_core)]#![no_core]' | RUSTC_BOOTSTRAP=1\
+	$(1) --sysroot=/dev/null $(filter-out --sysroot=/dev/null,$(2)) $(3)\
+	--crate-type=rlib --out-dir=$(TMPOUT) --emit=obj=- - >/dev/null,$(3),$(4))
 
 # rustc-option
 # Usage: rustflags-y += $(call rustc-option,-Cinstrument-coverage,-Zinstrument-coverage)
@@ -85,5 +86,4 @@ rustc-option = $(call __rustc-option, $(RUSTC),\
 
 # rustc-option-yn
 # Usage: flag := $(call rustc-option-yn,-Cinstrument-coverage)
-rustc-option-yn = $(call try-run,\
-	$(RUSTC) $(KBUILD_RUSTFLAGS) $(1) --crate-type=rlib /dev/null --out-dir=$$TMPOUT -o "$$TMP",y,n)
+rustc-option-yn = $(if $(call rustc-option,$1),y,n)

scripts/Makefile.dtbs

@@ -34,12 +34,14 @@ $(obj)/dtbs-list: $(dtb-y) FORCE
 # Assembly file to wrap dtb(o)
 # ---------------------------------------------------------------------------
 
+builtin-dtb-section = $(if $(filter arch/$(SRCARCH)/boot/dts%, $(obj)),.dtb.init.rodata,.rodata)
+
 # Generate an assembly file to wrap the output of the device tree compiler
 quiet_cmd_wrap_S_dtb = WRAP    $@
       cmd_wrap_S_dtb = {								\
 		symbase=__$(patsubst .%,%,$(suffix $<))_$(subst -,_,$(notdir $*));	\
 		echo '\#include <asm-generic/vmlinux.lds.h>';				\
-		echo '.section .dtb.init.rodata,"a"';					\
+		echo '.section $(builtin-dtb-section),"a"';				\
 		echo '.balign STRUCT_ALIGNMENT';					\
 		echo ".global $${symbase}_begin";					\
 		echo "$${symbase}_begin:";						\

scripts/include/list.h

@@ -127,6 +127,36 @@ static inline void list_del(struct list_head *entry)
 	entry->prev = LIST_POISON2;
 }
 
+/**
+ * list_replace - replace old entry by new one
+ * @old : the element to be replaced
+ * @new : the new element to insert
+ *
+ * If @old was empty, it will be overwritten.
+ */
+static inline void list_replace(struct list_head *old,
+				struct list_head *new)
+{
+	new->next = old->next;
+	new->next->prev = new;
+	new->prev = old->prev;
+	new->prev->next = new;
+}
+
+/**
+ * list_replace_init - replace old entry by new one and initialize the old one
+ * @old : the element to be replaced
+ * @new : the new element to insert
+ *
+ * If @old was empty, it will be overwritten.
+ */
+static inline void list_replace_init(struct list_head *old,
+				     struct list_head *new)
+{
+	list_replace(old, new);
+	INIT_LIST_HEAD(old);
+}
+
 /**
  * list_move - delete from one list and add as another's head
  * @list: the entry to move
@@ -150,6 +180,26 @@ static inline void list_move_tail(struct list_head *list,
 	list_add_tail(list, head);
 }
 
+/**
+ * list_is_first -- tests whether @list is the first entry in list @head
+ * @list: the entry to test
+ * @head: the head of the list
+ */
+static inline int list_is_first(const struct list_head *list, const struct list_head *head)
+{
+	return list->prev == head;
+}
+
+/**
+ * list_is_last - tests whether @list is the last entry in list @head
+ * @list: the entry to test
+ * @head: the head of the list
+ */
+static inline int list_is_last(const struct list_head *list, const struct list_head *head)
+{
+	return list->next == head;
+}
+
 /**
  * list_is_head - tests whether @list is the list @head
  * @list: the entry to test

scripts/kconfig/expr.c

@@ -47,6 +47,7 @@ static struct expr *expr_lookup(enum expr_type type, void *l, void *r)
 	e->type = type;
 	e->left._initdata = l;
 	e->right._initdata = r;
+	e->val_is_valid = false;
 
 	hash_add(expr_hashtable, &e->node, hash);
 

scripts/kconfig/parser.y

@@ -159,8 +159,14 @@ config_stmt: config_entry_start config_option_list
 			yynerrs++;
 		}
 
-		list_add_tail(&current_entry->sym->choice_link,
-			      &current_choice->choice_members);
+		/*
+		 * If the same symbol appears twice in a choice block, the list
+		 * node would be added twice, leading to a broken linked list.
+		 * list_empty() ensures that this symbol has not yet added.
+		 */
+		if (list_empty(&current_entry->sym->choice_link))
+			list_add_tail(&current_entry->sym->choice_link,
+				      &current_choice->choice_members);
 	}
 
 	printd(DEBUG_PARSE, "%s:%d:endconfig\n", cur_filename, cur_lineno);

scripts/kconfig/qconf.cc

@@ -1166,7 +1166,7 @@ void ConfigInfoView::clicked(const QUrl &url)
 {
 	QByteArray str = url.toEncoded();
 	const std::size_t count = str.size();
-	char *data = new char[count + 1];
+	char *data = new char[count + 2];  // '$' + '\0'
 	struct symbol **result;
 	struct menu *m = NULL;
 
@@ -1505,6 +1505,8 @@ ConfigMainWindow::ConfigMainWindow(void)
 	connect(helpText, &ConfigInfoView::menuSelected,
 		this, &ConfigMainWindow::setMenuLink);
 
+	conf_read(NULL);
+
 	QString listMode = configSettings->value("/listMode", "symbol").toString();
 	if (listMode == "single")
 		showSingleView();
@@ -1906,8 +1908,6 @@ int main(int ac, char** av)
 	configApp->connect(configApp, SIGNAL(lastWindowClosed()), SLOT(quit()));
 	configApp->connect(configApp, SIGNAL(aboutToQuit()), v, SLOT(saveSettings()));
 
-	conf_read(NULL);
-
 	v->show();
 	configApp->exec();
 

scripts/package/builddeb

@@ -74,7 +74,6 @@ install_linux_image () {
 
 		mkdir -p "${pdir}/DEBIAN"
 		cat <<-EOF > "${pdir}/DEBIAN/${script}"
-
 		#!/bin/sh
 
 		set -e

scripts/rustc-llvm-version.sh

@@ -0,0 +1,22 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+#
+# Usage: $ ./rustc-llvm-version.sh rustc
+#
+# Print the LLVM version that the Rust compiler uses in a 6 digit form.
+
+# Convert the version string x.y.z to a canonical up-to-6-digits form.
+get_canonical_version()
+{
+	IFS=.
+	set -- $1
+	echo $((10000 * $1 + 100 * $2 + $3))
+}
+
+if output=$("$@" --version --verbose 2>/dev/null | grep LLVM); then
+	set -- $output
+	get_canonical_version $3
+else
+	echo 0
+	exit 1
+fi