Jason A. Donenfeld 1366992e16 timekeeping: Add raw clock fallback for random_get_entropy() ... The addition of random_get_entropy_fallback() provides access to whichever time source has the highest frequency, which is useful for gathering entropy on platforms without available cycle counters. It's not necessarily as good as being able to quickly access a cycle counter that the CPU has, but it's still something, even when it falls back to being jiffies-based. In the event that a given arch does not define get_cycles(), falling back to the get_cycles() default implementation that returns 0 is really not the best we can do. Instead, at least calling random_get_entropy_fallback() would be preferable, because that always needs to return _something_, even falling back to jiffies eventually. It's not as though random_get_entropy_fallback() is super high precision or guaranteed to be entropic, but basically anything that's not zero all the time is better than returning zero all the time. Finally, since random_get_entropy_fallback() is used during extremely early boot when randomizing freelists in mm_init(), it can be called before timekeeping has been initialized. In that case there really is nothing we can do; jiffies hasn't even started ticking yet. So just give up and return 0. Suggested-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Theodore Ts'o <tytso@mit.edu>		2022-05-13 23:59:23 +02:00
..
bpf	bpf: Fix maximum permitted number of arguments check	2022-03-28 19:08:17 -07:00
cgroup	Driver core changes for 5.18-rc1	2022-03-28 12:41:28 -07:00
configs	Char/Misc and other driver updates for 5.18-rc1	2022-03-28 12:27:35 -07:00
debug	kdb: Fix the putarea helper function	2022-03-24 16:39:47 +00:00
dma	dma-direct: avoid redundant memory sync for swiotlb	2022-04-14 06:30:39 +02:00
entry	entry: Fix compile error in dynamic_irqentry_exit_cond_resched()	2022-04-05 09:59:36 +02:00
events	perf/core: Fix perf_mmap fail when CONFIG_PERF_USE_VMALLOC enabled	2022-04-19 21:15:42 +02:00
futex	mm/truncate: Inline invalidate_complete_page() into its one caller	2022-03-21 12:59:01 -04:00
gcov	gcov: Remove compiler version check	2021-12-02 17:25:21 +09:00
irq	genirq: Synchronize interrupt thread startup	2022-05-05 11:54:05 +02:00
kcsan	KCSAN updates for v5.17	2022-01-11 09:51:26 -08:00
livepatch	ptrace: Cleanups for v5.18	2022-03-28 17:29:53 -07:00
locking	Changes in this cycle were:	2022-03-22 13:44:21 -07:00
power	for-5.18/block-2022-03-18	2022-03-21 16:48:55 -07:00
printk	printk changes for 5.18	2022-03-23 10:54:27 -07:00
rcu	Changes in this cycle were:	2022-03-22 14:39:12 -07:00
sched	sched/pelt: Fix attach_entity_load_avg() corner case	2022-04-19 21:15:41 +02:00
time	timekeeping: Add raw clock fallback for random_get_entropy()	2022-05-13 23:59:23 +02:00
trace	Networking fixes for 5.18-rc2, including fixes from bpf and netfilter	2022-04-07 19:01:47 -10:00
.gitignore
acct.c	kernel: remove spurious blkdev.h includes	2021-10-18 06:17:01 -06:00
async.c	Revert "module, async: async_synchronize_full() on module init iff async is used"	2022-02-03 11:20:34 -08:00
audit.c	audit: improve audit queue handling when "audit=1" on cmdline	2022-01-25 13:22:51 -05:00
audit.h	audit: log AUDIT_TIME_* records only from rules	2022-02-22 13:51:40 -05:00
audit_fsnotify.c	fsnotify: clarify contract for create event hooks	2021-10-27 12:32:34 +02:00
audit_tree.c	audit: use struct_size() helper in kmalloc()	2021-12-14 17:39:42 -05:00
audit_watch.c	\n	2021-11-06 16:43:20 -07:00
auditfilter.c	audit/stable-5.17 PR 20220110	2022-01-11 13:08:21 -08:00
auditsc.c	audit/stable-5.18 PR 20220321	2022-03-21 20:53:11 -07:00
backtracetest.c
bounds.c
capability.c	xfs: don't generate selinux audit messages for capability testing	2022-03-09 10:32:06 -08:00
cfi.c	cfi: Use rcu_read_{un}lock_sched_notrace	2021-08-11 13:11:12 -07:00
compat.c	arch: remove compat_alloc_user_space	2021-09-08 15:32:35 -07:00
configs.c
context_tracking.c
cpu.c	cpu/hotplug: Remove the 'cpu' member of cpuhp_cpu_state	2022-04-13 21:25:40 +02:00
cpu_pm.c	PM: cpu: Make notifier chain use a raw_spinlock_t	2021-08-16 18:55:32 +02:00
crash_core.c	kernel/crash_core: suppress unknown crashkernel parameter warning	2021-12-25 12:20:55 -08:00
crash_dump.c
cred.c	x86: Mark __invalid_creds() __noreturn	2022-03-15 10:32:44 +01:00
delayacct.c	delayacct: track delays from memory compact	2022-01-20 08:52:55 +02:00
dma.c
exec_domain.c
exit.c	ptrace: Cleanups for v5.18	2022-03-28 17:29:53 -07:00
extable.c	lkdtm: Really write into kernel text in WRITE_KERN	2022-02-16 23:25:12 +11:00
fail_function.c
fork.c	mm: Fix PASID use-after-free issue	2022-05-01 10:17:17 +02:00
freezer.c	sched: Add get_current_state()	2021-06-18 11:43:08 +02:00
gen_kheaders.sh
groups.c
hung_task.c	hung_task: move hung_task sysctl interface to hung_task.c	2022-01-22 08:33:34 +02:00
iomem.c
irq_work.c	irq_work: use kasan_record_aux_stack_noalloc() record callstack	2022-04-15 14:49:55 -07:00
jump_label.c	jump_label: Fix jump_label_text_reserved() vs __init	2021-07-05 10:46:20 +02:00
kallsyms.c	kallsyms: Skip the name search for empty string	2022-03-17 20:17:18 -07:00
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks	locking/rwlock: Provide RT variant	2021-08-17 17:50:51 +02:00
Kconfig.preempt	Revert "signal, x86: Delay calling signals in atomic on RT enabled kernels"	2022-03-31 10:36:55 +02:00
kcov.c	kcov: don't generate a warning on vm_insert_page()'s failure	2022-04-21 20:01:10 -07:00
kexec.c	kexec: avoid compat_alloc_user_space	2021-09-08 15:32:34 -07:00
kexec_core.c	exit: Move oops specific logic from do_exit into make_task_dead	2021-12-13 12:04:45 -06:00
kexec_elf.c
kexec_file.c	memblock: add MEMBLOCK_DRIVER_MANAGED to mimic IORESOURCE_SYSRAM_DRIVER_MANAGED	2021-11-06 13:30:42 -07:00
kexec_internal.h
kheaders.c
kmod.c
kprobes.c	kprobes: Fix KRETPROBES when CONFIG_KRETPROBE_ON_RETHOOK is set	2022-04-26 16:09:36 +02:00
ksysfs.c	kernel/ksysfs.c: use helper macro __ATTR_RW	2022-03-23 19:00:33 -07:00
kthread.c	asm-generic updates for 5.18	2022-03-23 18:03:08 -07:00
latencytop.c
Makefile	static_call: Don't make __static_call_return0 static	2022-04-05 09:59:38 +02:00
module-internal.h	module: add in-kernel support for decompressing	2022-01-11 18:45:02 -08:00
module.c	NFSD: Remove svc_serv_ops::svo_module	2022-02-28 10:26:40 -05:00
module_decompress.c	module: fix building with sysfs disabled	2022-02-16 12:51:32 -08:00
module_signature.c
module_signing.c
notifier.c	notifier: Return an error when a callback has already been registered	2021-12-29 10:37:33 +01:00
nsproxy.c	memcg: enable accounting for new namesapces and struct nsproxy	2021-09-03 09:58:12 -07:00
padata.c	padata: replace cpumask_weight with cpumask_empty in padata.c	2022-01-31 11:21:46 +11:00
panic.c	panic: move panic_print before kmsg dumpers	2022-03-23 19:00:35 -07:00
params.c	kobject: remove kset from struct kset_uevent_ops callbacks	2021-12-28 11:26:18 +01:00
pid.c	pid: add pidfd_get_task() helper	2021-10-14 13:29:18 +02:00
pid_namespace.c	memcg: enable accounting for new namesapces and struct nsproxy	2021-09-03 09:58:12 -07:00
profile.c	exit: Remove profile_handoff_task	2022-01-08 12:43:57 -06:00
ptrace.c	ptrace: Check PTRACE_O_SUSPEND_SECCOMP permission on PTRACE_SEIZE	2022-03-22 13:06:05 -05:00
range.c
reboot.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input	2021-11-12 11:53:16 -08:00
regset.c
relay.c
resource.c	kernel/resource: fix kfree() of bootmem memory again	2022-03-23 19:00:35 -07:00
resource_kunit.c
rseq.c	rseq: Remove broken uapi field layout on 32-bit little endian	2022-02-02 13:11:34 +01:00
scftorture.c	scftorture: Always log error message	2021-12-07 16:36:17 -08:00
scs.c	kasan, vmalloc: only tag normal vmalloc allocations	2022-03-24 19:06:48 -07:00
seccomp.c	ptrace: Cleanups for v5.18	2022-03-28 17:29:53 -07:00
signal.c	Revert "signal, x86: Delay calling signals in atomic on RT enabled kernels"	2022-03-31 10:36:55 +02:00
smp.c	smp: Fix offline cpu check in flush_smp_call_function_queue()	2022-04-13 18:44:35 +02:00
smpboot.c	smpboot: Replace deprecated CPU-hotplug functions.	2021-08-10 14:57:42 +02:00
smpboot.h
softirq.c	genirq, softirq: Use in_hardirq() instead of in_irq()	2022-02-02 21:34:19 +01:00
stackleak.c	gcc-plugins/stackleak: Use noinstr in favor of notrace	2022-02-03 17:02:21 -08:00
stacktrace.c	uaccess: remove CONFIG_SET_FS	2022-02-25 09:36:06 +01:00
static_call.c	static_call: Don't make __static_call_return0 static	2022-04-05 09:59:38 +02:00
static_call_inline.c	static_call: Don't make __static_call_return0 static	2022-04-05 09:59:38 +02:00
stop_machine.c
sys.c	prlimit: do not grab the tasklist_lock	2022-03-08 14:33:36 -06:00
sys_ni.c	mm/mempolicy: wire up syscall set_mempolicy_home_node	2022-01-15 16:30:30 +02:00
sysctl-test.c	kernel/sysctl-test: Remove some casts which are no-longer required	2021-06-23 16:41:24 -06:00
sysctl.c	Merge branch 'akpm' (patches from Andrew)	2022-03-22 16:11:53 -07:00
task_work.c	resume_user_mode: Move to resume_user_mode.h	2022-03-10 16:51:50 -06:00
taskstats.c	taskstats: remove unneeded dead assignment	2022-03-23 19:00:35 -07:00
torture.c	torture: Wake up kthreads after storing task_struct pointer	2022-02-01 17:24:39 -08:00
tracepoint.c	tracepoint: Fix kerneldoc comments	2021-08-16 11:39:51 -04:00
tsacct.c	taskstats: Cleanup the use of task->exit_code	2022-01-08 12:43:57 -06:00
ucount.c	ucounts: Handle wrapping in is_ucounts_overlimit	2022-02-17 09:11:57 -06:00
uid16.c
uid16.h
umh.c
up.c
user-return-notifier.c
user.c	fs/epoll: use a per-cpu counter for user's watches count	2021-09-08 11:50:27 -07:00
user_namespace.c	ucounts: Fix systemd LimitNPROC with private users regression	2022-02-25 10:40:14 -06:00
usermode_driver.c	Merge branch 'work.namei' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2021-07-03 11:41:14 -07:00
utsname.c
utsname_sysctl.c
watch_queue.c	watch_queue: Free the page array when watch_queue is dismantled	2022-04-02 10:37:39 -07:00
watchdog.c	sched/isolation: Use single feature type while referring to housekeeping cpumask	2022-02-16 15:57:55 +01:00
watchdog_hld.c
workqueue.c	Merge branch 'for-5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq	2022-03-23 12:40:51 -07:00
workqueue_internal.h	workqueue: Assign a color to barrier work items	2021-08-17 07:49:10 -10:00