selftests/bpf: Add a test for objects stuck in free_by_rcu_ttracegrafted

Delete all elements of BPF_F_NO_PREALLOC hash map in one batch. The first
free_bulk() starts RCU tasks trace GP and the rest of the elements are
freed while it's in flight. Wait for call_rcu_ttrace_in_progress to clear
in bpf_mem_cache of every cpu and check that free_by_rcu_ttrace and
waiting_for_gp_ttrace lists are empty.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20260930095920.601738-4-alexei.starovoitov@gmail.com
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>

1 files changed, 162 insertions, 0 deletions

diff --git a/scripts/xz_wrap.sh b/scripts/xz_wrap.sh
new file mode 100755
index 000000000..f19369687
--- /dev/null
+++ b/scripts/xz_wrap.sh
@@ -0,0 +1,162 @@
+#!/bin/sh
+# SPDX-License-Identifier: 0BSD
+#
+# This is a wrapper for xz to compress the kernel image using appropriate
+# compression options depending on the architecture.
+#
+# Author: Lasse Collin <lasse.collin@tukaani.org>
+
+# This has specialized settings for the following archs. However,
+# XZ-compressed kernel isn't currently supported on every listed arch.
+#
+#   Arch        Align   Notes
+#   arm          2/4    ARM and ARM-Thumb2
+#   arm64         4
+#   csky          2
+#   loongarch     4
+#   mips         2/4    MicroMIPS is 2-byte aligned
+#   parisc        4
+#   powerpc       4     Uses its own wrapper for compressors instead of this.
+#   riscv        2/4
+#   s390          2
+#   sh            2
+#   sparc         4
+#   x86           1
+
+# A few archs use 2-byte or 4-byte aligned instructions depending on
+# the kernel config. This function is used to check if the relevant
+# config option is set to "y".
+is_enabled()
+{
+	grep -q "^$1=y$" include/config/auto.conf
+}
+
+# XZ_VERSION is needed to disable features that aren't available in
+# old XZ Utils versions.
+XZ_VERSION=$($XZ --robot --version) || exit
+XZ_VERSION=$(printf '%s\n' "$XZ_VERSION" | sed -n 's/^XZ_VERSION=//p')
+
+# Assume that no BCJ filter is available.
+BCJ=
+
+# Set the instruction alignment to 1, 2, or 4 bytes.
+#
+# Set the BCJ filter if one is available.
+# It must match the #ifdef usage in lib/decompress_unxz.c.
+case $SRCARCH in
+	arm)
+		if is_enabled CONFIG_THUMB2_KERNEL; then
+			ALIGN=2
+			BCJ=--armthumb
+		else
+			ALIGN=4
+			BCJ=--arm
+		fi
+		;;
+
+	arm64)
+		ALIGN=4
+
+		# ARM64 filter was added in XZ Utils 5.4.0.
+		if [ "$XZ_VERSION" -ge 50040002 ]; then
+			BCJ=--arm64
+		else
+			echo "$0: Upgrading to xz >= 5.4.0" \
+				"would enable the ARM64 filter" \
+				"for better compression" >&2
+		fi
+		;;
+
+	csky)
+		ALIGN=2
+		;;
+
+	loongarch)
+		ALIGN=4
+		;;
+
+	mips)
+		if is_enabled CONFIG_CPU_MICROMIPS; then
+			ALIGN=2
+		else
+			ALIGN=4
+		fi
+		;;
+
+	parisc)
+		ALIGN=4
+		;;
+
+	powerpc)
+		ALIGN=4
+
+		# The filter is only for big endian instruction encoding.
+		if is_enabled CONFIG_CPU_BIG_ENDIAN; then
+			BCJ=--powerpc
+		fi
+		;;
+
+	riscv)
+		if is_enabled CONFIG_RISCV_ISA_C; then
+			ALIGN=2
+		else
+			ALIGN=4
+		fi
+
+		# RISC-V filter was added in XZ Utils 5.6.0.
+		if [ "$XZ_VERSION" -ge 50060002 ]; then
+			BCJ=--riscv
+		else
+			echo "$0: Upgrading to xz >= 5.6.0" \
+				"would enable the RISC-V filter" \
+				"for better compression" >&2
+		fi
+		;;
+
+	s390)
+		ALIGN=2
+		;;
+
+	sh)
+		ALIGN=2
+		;;
+
+	sparc)
+		ALIGN=4
+		BCJ=--sparc
+		;;
+
+	x86)
+		ALIGN=1
+		BCJ=--x86
+		;;
+
+	*)
+		echo "$0: Arch-specific tuning is missing for '$SRCARCH'" >&2
+
+		# Guess 2-byte-aligned instructions. Guessing too low
+		# should hurt less than guessing too high.
+		ALIGN=2
+		;;
+esac
+
+# Select the LZMA2 options matching the instruction alignment.
+case $ALIGN in
+	1)  LZMA2OPTS= ;;
+	2)  LZMA2OPTS=lp=1 ;;
+	4)  LZMA2OPTS=lp=2,lc=2 ;;
+	*)  echo "$0: ALIGN wrong or missing" >&2; exit 1 ;;
+esac
+
+# Use single-threaded mode because it compresses a little better
+# (and uses less RAM) than multithreaded mode.
+#
+# For the best compression, the dictionary size shouldn't be
+# smaller than the uncompressed kernel. 128 MiB dictionary
+# needs less than 1400 MiB of RAM in single-threaded mode.
+#
+# On the archs that use this script to compress the kernel,
+# decompression in the preboot code is done in single-call mode.
+# Thus the dictionary size doesn't affect the memory requirements
+# of the preboot decompressor at all.
+exec $XZ --check=crc32 --threads=1 $BCJ --lzma2=$LZMA2OPTS,dict=128MiB