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Thomas Gleixner faba9d250e rseq: Introduce struct rseq_data 
In preparation for a major rewrite of this code, provide a data structure
for rseq management.

Put all the rseq related data into it (except for the debug part), which
allows to simplify fork/execve by using memset() and memcpy() instead of
adding new fields to initialize over and over.

Create a storage struct for event management as well and put the
sched_switch event and a indicator for RSEQ on a task into it as a
start. That uses a union, which allows to mask and clear the whole lot
efficiently.

The indicators are explicitly not a bit field. Bit fields generate abysmal
code.

The boolean members are defined as u8 as that actually guarantees that it
fits. There seem to be strange architecture ABIs which need more than 8
bits for a boolean.

The has_rseq member is redundant vs. task::rseq, but it turns out that
boolean operations and quick checks on the union generate better code than
fiddling with separate entities and data types.

This struct will be extended over time to carry more information.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Link: https://patch.msgid.link/20251027084306.527086690@linutronix.de
 		2025-11-04 08:30:50 +01:00
..
bpf bpf: Conditionally include dynptr copy kfuncs 2025-10-24 09:44:47 -07:00
cgroup cgroup: Fixes for v6.18-rc2 2025-10-20 09:41:27 -10:00
configs kcfi: Rename CONFIG_CFI_CLANG to CONFIG_CFI 2025-09-24 14:29:14 -07:00
debug kdb: remove redundant check for scancode 0xe0 2025-09-20 21:19:09 +01:00
dma dma-debug: don't report false positives with DMA_BOUNCE_UNALIGNED_KMALLOC 2025-10-15 13:24:33 -07:00
entry hyperv-next for v6.18 2025-10-07 08:40:15 -07:00
events perf/core: Fix MMAP2 event device with backing files 2025-10-14 10:38:10 +02:00
futex futex: Convert to get/put_user_inline() 2025-11-04 08:28:23 +01:00
gcov kbuild: require gcc-8 and binutils-2.30 2025-04-30 21:53:35 +02:00
irq genirq/manage: Add buslock back in to enable_irq() 2025-10-24 11:38:39 +02:00
kcsan Kernel Concurrency Sanitizer (KCSAN) updates for v6.18 2025-10-02 08:31:44 -07:00
livepatch sched,livepatch: Untangle cond_resched() and live-patching 2025-05-14 13:16:24 +02:00
locking locking/local_lock: Introduce local_lock_is_locked(). 2025-09-29 09:42:35 +02:00
module kcfi: Rename CONFIG_CFI_CLANG to CONFIG_CFI 2025-09-24 14:29:14 -07:00
power PM: sleep: Allow pm_restrict_gfp_mask() stacking 2025-10-29 18:55:32 +01:00
printk printk changes for 6.18 2025-10-04 11:13:11 -07:00
rcu hyperv-next for v6.18 2025-10-07 08:40:15 -07:00
sched rseq: Simplify the event notification 2025-11-04 08:30:09 +01:00
time timekeeping: Fix aux clocks sysfs initialization loop bound 2025-10-20 19:56:12 +02:00
trace rv: Make rtapp/pagefault monitor depends on CONFIG_MMU 2025-10-20 12:47:40 +02:00
unwind unwind: Finish up unwind when a task exits 2025-07-31 10:20:11 -04:00
.gitignore kheaders: rebuild kheaders_data.tar.xz when a file is modified within a minute 2025-06-24 20:30:37 +09:00
Kconfig.freezer
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Kconfig.hz kernel: Fix "select" wording on HZ_250 description 2025-02-21 09:20:30 +01:00
Kconfig.kexec crash: add KUnit tests for crash_exclude_mem_range 2025-09-13 17:32:55 -07:00
Kconfig.locks
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Kconfig.preempt softirq: Allow to drop the softirq-BKL lock on PREEMPT_RT 2025-09-17 16:25:41 +02:00
Makefile Patch series in this pull request: 2025-10-02 18:44:54 -07:00
acct.c kernel/acct.c: saner struct file treatment 2025-09-27 20:13:56 -04:00
async.c
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audit.c audit: fix skb leak when audit rate limit is exceeded 2025-09-10 19:55:00 -04:00
audit.h audit: create audit_stamp structure 2025-08-30 10:15:28 -04:00
audit_fsnotify.c VFS/audit: introduce kern_path_parent() for audit 2025-09-23 12:37:35 +02:00
audit_tree.c mount-related stuff for this cycle 2025-10-03 10:19:44 -07:00
audit_watch.c VFS/audit: introduce kern_path_parent() for audit 2025-09-23 12:37:35 +02:00
auditfilter.c audit/stable-6.18 PR 20250926 2025-09-30 08:22:16 -07:00
auditsc.c audit: add record for multiple object contexts 2025-08-30 10:15:30 -04:00
backtracetest.c
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bounds.c
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capability.c capability: Remove unused has_capability 2025-03-07 22:03:09 -06:00
cfi.c cfi: Move BPF CFI types and helpers to generic code 2025-07-31 18:23:53 -07:00
compat.c
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configs.c
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context_tracking.c context_tracking: Make RCU watch ct_kernel_exit_state() warning 2025-03-04 18:44:29 -08:00
cpu.c cpu: Remove obsolete comment from takedown_cpu() 2025-08-06 22:48:12 +02:00
cpu_pm.c
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crash_core.c crash: add KUnit tests for crash_exclude_mem_range 2025-09-13 17:32:55 -07:00
crash_core_test.c crash: add KUnit tests for crash_exclude_mem_range 2025-09-13 17:32:55 -07:00
crash_dump_dm_crypt.c crash_dump: retrieve dm crypt keys in kdump kernel 2025-05-21 10:48:21 -07:00
crash_reserve.c kdump: implement reserve_crashkernel_cma 2025-07-19 19:08:23 -07:00
cred.c copy_process: pass clone_flags as u64 across calltree 2025-09-01 15:31:34 +02:00
delayacct.c delayacct: remove redundant code and adjust indentation 2025-05-27 19:40:33 -07:00
dma.c
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elfcorehdr.c
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exec_domain.c
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exit.c task_stack.h: clean-up stack_not_used() implementation 2025-09-21 14:22:00 -07:00
exit.h
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extable.c
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fail_function.c
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fork.c Patch series in this pull request: 2025-10-02 18:44:54 -07:00
freezer.c mm/oom_kill: thaw the entire OOM victim process 2025-09-21 14:22:35 -07:00
gen_kheaders.sh kheaders: make it possible to override TAR 2025-08-06 10:23:36 +09:00
groups.c
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hung_task.c hung_task: dump blocker task if it is not hung 2025-09-13 17:32:43 -07:00
iomem.c mm/memremap: Pass down MEMREMAP_* flags to arch_memremap_wb() 2025-02-21 15:05:38 +01:00
irq_work.c
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jump_label.c jump_label: Use RCU in all users of __module_text_address(). 2025-03-10 11:54:46 +01:00
kallsyms.c bpf: Clean up individual BTF_ID code 2025-07-16 18:34:42 -07:00
kallsyms_internal.h
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kallsyms_selftest.c kallsyms: use kmalloc_array() instead of kmalloc() 2025-09-28 11:36:14 -07:00
kallsyms_selftest.h
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kcmp.c kcmp: improve performance adding an unlikely hint to task comparisons 2025-02-21 10:25:33 +01:00
kcov.c kcov: use write memory barrier after memcpy() in kcov_move_area() 2025-09-13 17:32:44 -07:00
kexec.c kexec: enable CMA based contiguous allocation 2025-08-02 12:01:38 -07:00
kexec_core.c kexec_core: remove redundant 0 value initialization 2025-09-13 17:32:49 -07:00
kexec_elf.c kexec: initialize ELF lowest address to ULONG_MAX 2025-03-16 22:30:47 -07:00
kexec_file.c x86/kexec: carry forward the boot DTB on kexec 2025-09-13 17:32:43 -07:00
kexec_handover.c kho: add support for preserving vmalloc allocations 2025-10-07 13:48:55 -07:00
kexec_internal.h kexec: enable CMA based contiguous allocation 2025-08-02 12:01:38 -07:00
kheaders.c
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kprobes.c kprobes: Add missing kerneldoc for __get_insn_slot 2025-07-15 18:45:34 +09:00
kstack_erase.c stackleak: Rename stackleak_track_stack to __sanitizer_cov_stack_depth 2025-07-21 21:40:39 -07:00
ksyms_common.c
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ksysfs.c
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kthread.c ipvs: Fix estimator kthreads preferred affinity 2025-08-13 08:34:33 +02:00
latencytop.c
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module_signature.c
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notifier.c
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nscommon.c ns: drop assert 2025-09-25 09:23:54 +02:00
nsproxy.c namespace-6.18-rc1 2025-09-29 11:20:29 -07:00
nstree.c ns: move ns type into struct ns_common 2025-09-25 09:23:54 +02:00
padata.c padata: WQ_PERCPU added to alloc_workqueue users 2025-09-13 12:11:06 +08:00
panic.c panic: remove CONFIG_PANIC_ON_OOPS_VALUE 2025-09-28 11:36:13 -07:00
params.c params: Replace deprecated strcpy() with strscpy() and memcpy() 2025-08-16 21:47:25 +02:00
pid.c namespace-6.18-rc1 2025-09-29 11:20:29 -07:00
pid_namespace.c namespace-6.18-rc1 2025-09-29 11:20:29 -07:00
pid_sysctl.h
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profile.c
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ptrace.c rseq: Introduce struct rseq_data 2025-11-04 08:30:50 +01:00
range.c
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reboot.c - The 7 patch series "powerpc/crash: use generic crashkernel 2025-04-01 10:06:52 -07:00
regset.c
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relay.c relayfs: support a counter tracking if data is too big to write 2025-07-09 22:57:52 -07:00
resource.c resource: improve child resource handling in release_mem_region_adjustable() 2025-09-21 14:22:34 -07:00
resource_kunit.c
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rseq.c rseq: Introduce struct rseq_data 2025-11-04 08:30:50 +01:00
scftorture.c
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scs.c
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seccomp.c Performance events updates for v6.18: 2025-09-30 11:11:21 -07:00
signal.c signal: Fix memory leak for PIDFD_SELF* sentinels 2025-08-19 13:51:28 +02:00
smp.c smp: Fix up and expand the smp_call_function_many() kerneldoc 2025-09-18 22:21:28 +02:00
smpboot.c sched/smp: Use the SMP version of idle_thread_set_boot_cpu() 2025-06-13 08:47:20 +02:00
smpboot.h
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softirq.c softirq: Allow to drop the softirq-BKL lock on PREEMPT_RT 2025-09-17 16:25:41 +02:00
stacktrace.c
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static_call.c
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static_call_inline.c Modules changes for 6.15-rc1 2025-03-30 15:44:36 -07:00
stop_machine.c sched/core: Fix migrate_swap() vs. hotplug 2025-07-01 15:02:03 +02:00
sys.c Patch series in this pull request: 2025-10-02 18:44:54 -07:00
sys_ni.c uprobes/x86: Add uprobe syscall to speed up uprobe 2025-08-21 20:09:20 +02:00
sysctl-test.c sysctl: move u8 register test to lib/test_sysctl.c 2025-04-14 14:13:41 +02:00
sysctl.c sysctl: rename kern_table -> sysctl_subsys_table 2025-07-23 11:56:02 +02:00
task_work.c
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taskstats.c
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torture.c torture: Delay CPU-hotplug operations until boot completes 2025-08-14 15:26:30 -07:00
tracepoint.c tracepoint: Print the function symbol when tracepoint_debug is set 2025-03-21 15:30:10 -04:00
tsacct.c pid: change bacct_add_tsk() to use task_ppid_nr_ns() 2025-08-19 13:38:20 +02:00
ucount.c ucount: use atomic_long_try_cmpxchg() in atomic_long_inc_below() 2025-08-02 12:01:38 -07:00
uid16.c
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uid16.h
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umh.c
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up.c
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user-return-notifier.c
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user.c ns: move ns type into struct ns_common 2025-09-25 09:23:54 +02:00
user_namespace.c ns: move ns type into struct ns_common 2025-09-25 09:23:54 +02:00
utsname.c namespace-6.18-rc1 2025-09-29 11:20:29 -07:00
utsname_sysctl.c
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vhost_task.c vhost: Take a reference on the task in struct vhost_task. 2025-09-21 17:44:20 -04:00
vmcore_info.c crash: export PAGE_UNACCEPTED_MAPCOUNT_VALUE to vmcoreinfo 2025-05-11 17:54:04 -07:00
watch_queue.c vfs-6.15-rc1.pipe 2025-03-24 09:52:37 -07:00
watchdog.c watchdog: skip checks when panic is in progress 2025-09-13 17:32:53 -07:00
watchdog_buddy.c watchdog: fix opencoded cpumask_next_wrap() in watchdog_next_cpu() 2025-07-31 11:28:03 -04:00
watchdog_perf.c watchdog: skip checks when panic is in progress 2025-09-13 17:32:53 -07:00
workqueue.c workqueue: WQ_PERCPU added to alloc_workqueue users 2025-09-16 10:33:53 -10:00
workqueue_internal.h
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