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. --- tools/testing/selftests/tmpfs/.gitignore | 2 + tools/testing/selftests/tmpfs/Makefile | 7 ++ tools/testing/selftests/tmpfs/bug-link-o-tmpfile.c | 78 ++++++++++++++++++++++ 3 files changed, 87 insertions(+) create mode 100644 tools/testing/selftests/tmpfs/.gitignore create mode 100644 tools/testing/selftests/tmpfs/Makefile create mode 100644 tools/testing/selftests/tmpfs/bug-link-o-tmpfile.c (limited to 'tools/testing/selftests/tmpfs') diff --git a/tools/testing/selftests/tmpfs/.gitignore b/tools/testing/selftests/tmpfs/.gitignore new file mode 100644 index 000000000..b1afaa925 --- /dev/null +++ b/tools/testing/selftests/tmpfs/.gitignore @@ -0,0 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0-only +/bug-link-o-tmpfile diff --git a/tools/testing/selftests/tmpfs/Makefile b/tools/testing/selftests/tmpfs/Makefile new file mode 100644 index 000000000..3be931e11 --- /dev/null +++ b/tools/testing/selftests/tmpfs/Makefile @@ -0,0 +1,7 @@ +# SPDX-License-Identifier: GPL-2.0-only +CFLAGS += -Wall -O2 + +TEST_GEN_PROGS := +TEST_GEN_PROGS += bug-link-o-tmpfile + +include ../lib.mk diff --git a/tools/testing/selftests/tmpfs/bug-link-o-tmpfile.c b/tools/testing/selftests/tmpfs/bug-link-o-tmpfile.c new file mode 100644 index 000000000..5cb4e404a --- /dev/null +++ b/tools/testing/selftests/tmpfs/bug-link-o-tmpfile.c @@ -0,0 +1,78 @@ +/* + * Copyright (c) 2019 Alexey Dobriyan + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ +/* Test that open(O_TMPFILE), linkat() doesn't screw accounting. */ +#include +#include +#include +#include +#include +#include +#include +#include + +#include "kselftest.h" + +int main(void) +{ + int fd; + + // Setting up kselftest framework + ksft_print_header(); + ksft_set_plan(1); + + // Check if test is run as root + if (geteuid()) { + ksft_exit_skip("This test needs root to run!\n"); + return 1; + } + + if (unshare(CLONE_NEWNS) == -1) { + if (errno == ENOSYS || errno == EPERM) { + ksft_exit_skip("unshare() error: unshare, errno %d\n", errno); + } else { + ksft_exit_fail_msg("unshare() error: unshare, errno %d\n", errno); + } + } + + if (mount(NULL, "/", NULL, MS_PRIVATE|MS_REC, NULL) == -1) { + ksft_exit_fail_msg("mount() error: Root filesystem private mount: Fail %d\n", errno); + } + + /* Our heroes: 1 root inode, 1 O_TMPFILE inode, 1 permanent inode. */ + if (mount(NULL, "/tmp", "tmpfs", 0, "nr_inodes=3") == -1) { + ksft_exit_fail_msg("mount() error: Mounting tmpfs on /tmp: Fail %d\n", errno); + } + + fd = openat(AT_FDCWD, "/tmp", O_WRONLY|O_TMPFILE, 0600); + if (fd == -1) { + ksft_exit_fail_msg("openat() error: Open first temporary file: Fail %d\n", errno); + } + + if (linkat(fd, "", AT_FDCWD, "/tmp/1", AT_EMPTY_PATH) == -1) { + ksft_exit_fail_msg("linkat() error: Linking the temporary file: Fail %d\n", errno); + /* Ensure fd is closed on failure */ + close(fd); + } + close(fd); + + fd = openat(AT_FDCWD, "/tmp", O_WRONLY|O_TMPFILE, 0600); + if (fd == -1) { + ksft_exit_fail_msg("openat() error: Opening the second temporary file: Fail %d\n", errno); + } + ksft_test_result_pass(" "); + ksft_exit_pass(); + return 0; +} -- cgit v1.3.1