From 9cc63f8bcd560c760d0b12e15bba8f81c86237cf Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Fri, 14 Aug 2026 15:43:51 -0700 Subject: 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 HEAD 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. --- usr/gen_initramfs.sh | 250 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 250 insertions(+) create mode 100755 usr/gen_initramfs.sh (limited to 'usr/gen_initramfs.sh') diff --git a/usr/gen_initramfs.sh b/usr/gen_initramfs.sh new file mode 100755 index 000000000..7eba2fddf --- /dev/null +++ b/usr/gen_initramfs.sh @@ -0,0 +1,250 @@ +#!/bin/sh +# Copyright (C) Martin Schlemmer +# Copyright (C) 2006 Sam Ravnborg +# +# Released under the terms of the GNU GPL +# +# Generate a cpio packed initramfs. It uses gen_init_cpio to generate +# the cpio archive. +# This script assumes that gen_init_cpio is located in usr/ directory + +# error out on errors +set -e + +usage() { +cat << EOF +Usage: +$0 [-o ] [-l ] [-u ] [-g ] {-d | } ... + -o Create initramfs file named by using gen_init_cpio + -l Create dependency list named + -u User ID to map to user ID 0 (root). + is only meaningful if is a + directory. "squash" forces all files to uid 0. + -g Group ID to map to group ID 0 (root). + is only meaningful if is a + directory. "squash" forces all files to gid 0. + -d Use date for all file mtime values + File list or directory for cpio archive. + If is a .cpio file it will be used + as direct input to initramfs. + +All options except -o and -l may be repeated and are interpreted +sequentially and immediately. -u and -g states are preserved across + options so an explicit "-u 0 -g 0" is required +to reset the root/group mapping. +EOF +} + +# awk style field access +# $1 - field number; rest is argument string +field() { + shift $1 ; echo $1 +} + +filetype() { + local argv1="$1" + + # symlink test must come before file test + if [ -L "${argv1}" ]; then + echo "slink" + elif [ -f "${argv1}" ]; then + echo "file" + elif [ -d "${argv1}" ]; then + echo "dir" + elif [ -b "${argv1}" -o -c "${argv1}" ]; then + echo "nod" + elif [ -p "${argv1}" ]; then + echo "pipe" + elif [ -S "${argv1}" ]; then + echo "sock" + else + echo "invalid" + fi + return 0 +} + +print_mtime() { + local my_mtime="0" + + if [ -e "$1" ]; then + my_mtime=$(find "$1" -printf "%T@\n" | sort -r | head -n 1) + fi + + echo "# Last modified: ${my_mtime}" >> $cpio_list + echo "" >> $cpio_list +} + +list_parse() { + if [ -z "$dep_list" -o -L "$1" ]; then + return + fi + echo "$1" | sed 's/:/\\:/g; s/$/ \\/' >> $dep_list +} + +# for each file print a line in following format +# +# for links, devices etc the format differs. See gen_init_cpio for details +parse() { + local location="$1" + local name="/${location#${srcdir}}" + # change '//' into '/' + name=$(echo "$name" | sed -e 's://*:/:g') + local mode="$2" + local uid="$3" + local gid="$4" + local ftype=$(filetype "${location}") + # remap uid/gid to 0 if necessary + [ "$root_uid" = "squash" ] && uid=0 || [ "$uid" -eq "$root_uid" ] && uid=0 + [ "$root_gid" = "squash" ] && gid=0 || [ "$gid" -eq "$root_gid" ] && gid=0 + local str="${mode} ${uid} ${gid}" + + [ "${ftype}" = "invalid" ] && return 0 + [ "${location}" = "${srcdir}" ] && return 0 + + case "${ftype}" in + "file") + str="${ftype} ${name} ${location} ${str}" + ;; + "nod") + local dev="`LC_ALL=C ls -l "${location}"`" + local maj=`field 5 ${dev}` + local min=`field 6 ${dev}` + maj=${maj%,} + + [ -b "${location}" ] && dev="b" || dev="c" + + str="${ftype} ${name} ${str} ${dev} ${maj} ${min}" + ;; + "slink") + local target=`readlink "${location}"` + str="${ftype} ${name} ${target} ${str}" + ;; + *) + str="${ftype} ${name} ${str}" + ;; + esac + + echo "${str}" >> $cpio_list + + return 0 +} + +unknown_option() { + printf "ERROR: unknown option \"$arg\"\n" >&2 + printf "If the filename validly begins with '-', " >&2 + printf "then it must be prefixed\n" >&2 + printf "by './' so that it won't be interpreted as an option." >&2 + printf "\n" >&2 + usage >&2 + exit 1 +} + +header() { + printf "\n#####################\n# $1\n" >> $cpio_list +} + +# process one directory (incl sub-directories) +dir_filelist() { + header "$1" + + srcdir=$(echo "$1" | sed -e 's://*:/:g') + dirlist=$(find "${srcdir}" -printf "%p %m %U %G\n" | LC_ALL=C sort) + + # If $dirlist is only one line, then the directory is empty + if [ "$(echo "${dirlist}" | wc -l)" -gt 1 ]; then + print_mtime "$1" + + echo "${dirlist}" | \ + while read x; do + list_parse $x + parse $x + done + fi +} + +input_file() { + source="$1" + if [ -f "$1" ]; then + # If a regular file is specified, assume it is in + # gen_init_cpio format + header "$1" + print_mtime "$1" >> $cpio_list + cat "$1" >> $cpio_list + if [ -n "$dep_list" ]; then + echo "$1 \\" >> $dep_list + cat "$1" | while read type dir file perm ; do + if [ "$type" = "file" ]; then + echo "$file \\" >> $dep_list + fi + done + fi + elif [ -d "$1" ]; then + # If a directory is specified then add all files in it to fs + dir_filelist "$1" + else + echo " ${prog}: Cannot open '$1'" >&2 + exit 1 + fi +} + +prog=$0 +root_uid=0 +root_gid=0 +dep_list= +timestamp= +cpio_list=$(mktemp ${TMPDIR:-/tmp}/cpiolist.XXXXXX) +# gen_init_cpio writes to stdout by default +output="" + +trap "rm -f $cpio_list" EXIT + +while [ $# -gt 0 ]; do + arg="$1" + shift + case "$arg" in + "-l") # files included in initramfs - used by kbuild + dep_list="$1" + echo "deps_initramfs := \\" > $dep_list + shift + ;; + "-o") # generate cpio image named $1 + output="-o $1" + shift + ;; + "-u") # map $1 to uid=0 (root) + root_uid="$1" + [ "$root_uid" = "-1" ] && root_uid=$(id -u || echo 0) + shift + ;; + "-g") # map $1 to gid=0 (root) + root_gid="$1" + [ "$root_gid" = "-1" ] && root_gid=$(id -g || echo 0) + shift + ;; + "-d") # date for file mtimes + timestamp="$(date -d"$1" +%s || :)" + if test -n "$timestamp"; then + timestamp="-t $timestamp" + fi + shift + ;; + "-h") + usage + exit 0 + ;; + *) + case "$arg" in + "-"*) + unknown_option + ;; + *) # input file/dir - process it + input_file "$arg" + ;; + esac + ;; + esac +done + +# If output_file is set we will generate cpio archive +# we are careful to delete tmp files +usr/gen_init_cpio $output $timestamp $cpio_list -- cgit v1.3.1