linux/drivers/char/random.c, branch v6.17

Merge tag 'ratelimit.2025.05.25a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu

2025-05-27T17:48:36Z

Pull rate-limit updates from Paul McKenney: "lib/ratelimit: Reduce false-positive and silent misses: - Reduce open-coded use of ratelimit_state structure fields. - Convert the ->missed field to atomic_t. - Count misses that are due to lock contention. - Eliminate jiffies=0 special case. - Reduce ___ratelimit() false-positive rate limiting (Petr Mladek). - Allow zero ->burst to hard-disable rate limiting. - Optimize away atomic operations when a miss is guaranteed. - Warn if ->interval or ->burst are negative (Petr Mladek). - Simplify the resulting code. A smoke test and stress test have been created, but they are not yet ready for mainline. With luck, we will offer them for the v6.17 merge window" * tag 'ratelimit.2025.05.25a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu: ratelimit: Drop redundant accesses to burst ratelimit: Use nolock_ret restructuring to collapse common case code ratelimit: Use nolock_ret label to collapse lock-failure code ratelimit: Use nolock_ret label to save a couple of lines of code ratelimit: Simplify common-case exit path ratelimit: Warn if ->interval or ->burst are negative ratelimit: Avoid atomic decrement under lock if already rate-limited ratelimit: Avoid atomic decrement if already rate-limited ratelimit: Don't flush misses counter if RATELIMIT_MSG_ON_RELEASE ratelimit: Force re-initialization when rate-limiting re-enabled ratelimit: Allow zero ->burst to disable ratelimiting ratelimit: Reduce ___ratelimit() false-positive rate limiting ratelimit: Avoid jiffies=0 special case ratelimit: Count misses due to lock contention ratelimit: Convert the ->missed field to atomic_t drm/amd/pm: Avoid open-coded use of ratelimit_state structure's internals drm/i915: Avoid open-coded use of ratelimit_state structure's ->missed field random: Avoid open-coded use of ratelimit_state structure's ->missed field ratelimit: Create functions to handle ratelimit_state internals

Merge tag 'timers-cleanups-2025-05-25' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2025-05-27T15:31:21Z

Pull timer cleanups from Thomas Gleixner: "Another set of timer API cleanups: - Convert init_timer*(), try_to_del_timer_sync() and destroy_timer_on_stack() over to the canonical timer_*() namespace convention. There is another large conversion pending, which has not been included because it would have caused a gazillion of merge conflicts in next. The conversion scripts will be run towards the end of the merge window and a pull request sent once all conflict dependencies have been merged" * tag 'timers-cleanups-2025-05-25' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: treewide, timers: Rename destroy_timer_on_stack() as timer_destroy_on_stack() treewide, timers: Rename try_to_del_timer_sync() as timer_delete_sync_try() timers: Rename init_timers() as timers_init() timers: Rename NEXT_TIMER_MAX_DELTA as TIMER_NEXT_MAX_DELTA timers: Rename __init_timer_on_stack() as __timer_init_on_stack() timers: Rename __init_timer() as __timer_init() timers: Rename init_timer_on_stack_key() as timer_init_key_on_stack() timers: Rename init_timer_key() as timer_init_key()

crypto: lib/chacha - add strongly-typed state zeroization

2025-05-12T05:32:53Z

Now that the ChaCha state matrix is strongly-typed, add a helper function chacha_zeroize_state() which zeroizes it. Then convert all applicable callers to use it instead of direct memzero_explicit. No functional changes. Signed-off-by: Eric Biggers Signed-off-by: Herbert Xu

crypto: lib/chacha - strongly type the ChaCha state

2025-05-12T05:32:53Z

The ChaCha state matrix is 16 32-bit words. Currently it is represented in the code as a raw u32 array, or even just a pointer to u32. This weak typing is error-prone. Instead, introduce struct chacha_state: struct chacha_state { u32 x[16]; }; Convert all ChaCha and HChaCha functions to use struct chacha_state. No functional changes. Signed-off-by: Eric Biggers Acked-by: Kent Overstreet Signed-off-by: Herbert Xu

random: Avoid open-coded use of ratelimit_state structure's ->missed field

2025-05-08T23:13:26Z

The _credit_init_bits() function directly accesses the ratelimit_state structure's ->missed field, which works, but which also makes it more difficult to change this field. Therefore, make use of the ratelimit_state_get_miss() and ratelimit_state_inc_miss() functions instead of directly accessing the ->missed field. Link: https://lore.kernel.org/all/fbe93a52-365e-47fe-93a4-44a44547d601@paulmck-laptop/ Link: https://lore.kernel.org/all/20250423115409.3425-1-spasswolf@web.de/ Signed-off-by: Paul E. McKenney Reviewed-by: Petr Mladek Cc: "Theodore Ts'o" "Jason A. Donenfeld"

treewide, timers: Rename destroy_timer_on_stack() as timer_destroy_on_stack()

2025-05-08T17:49:33Z

Move this API to the canonical timer_*() namespace. Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner Link: https://lore.kernel.org/all/20250507175338.672442-10-mingo@kernel.org

treewide, timers: Rename try_to_del_timer_sync() as timer_delete_sync_try()

2025-05-08T17:49:33Z

Move this API to the canonical timer_*() namespace. Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner Link: https://lore.kernel.org/all/20250507175338.672442-9-mingo@kernel.org

treewide: Switch/rename to timer_delete[_sync]()

2025-04-05T08:30:12Z

timer_delete[_sync]() replaces del_timer[_sync](). Convert the whole tree over and remove the historical wrapper inlines. Conversion was done with coccinelle plus manual fixups where necessary. Signed-off-by: Thomas Gleixner Signed-off-by: Ingo Molnar

vdso: Add generic random data storage

2025-02-21T08:54:01Z

Extend the generic vDSO data storage with a page for the random state data. The random state data is stored in a dedicated page, as the existing storage page is only meant for time-related, time-namespace-aware data. This simplifies to access logic to not need to handle time namespaces anymore and also frees up more space in the time-related page. In case further generic vDSO data store is required it can be added to the random state page. Signed-off-by: Thomas Weißschuh Signed-off-by: Thomas Gleixner Link: https://lore.kernel.org/all/20250204-vdso-store-rng-v3-6-13a4669dfc8c@linutronix.de

treewide: const qualify ctl_tables where applicable

2025-01-28T12:48:37Z

Add the const qualifier to all the ctl_tables in the tree except for watchdog_hardlockup_sysctl, memory_allocation_profiling_sysctls, loadpin_sysctl_table and the ones calling register_net_sysctl (./net, drivers/inifiniband dirs). These are special cases as they use a registration function with a non-const qualified ctl_table argument or modify the arrays before passing them on to the registration function. Constifying ctl_table structs will prevent the modification of proc_handler function pointers as the arrays would reside in .rodata. This is made possible after commit 78eb4ea25cd5 ("sysctl: treewide: constify the ctl_table argument of proc_handlers") constified all the proc_handlers. Created this by running an spatch followed by a sed command: Spatch: virtual patch @ depends on !(file in "net") disable optional_qualifier @ identifier table_name != { watchdog_hardlockup_sysctl, iwcm_ctl_table, ucma_ctl_table, memory_allocation_profiling_sysctls, loadpin_sysctl_table }; @@ + const struct ctl_table table_name [] = { ... }; sed: sed --in-place \ -e "s/struct ctl_table .table = &uts_kern/const struct ctl_table *table = \&uts_kern/" \ kernel/utsname_sysctl.c Reviewed-by: Song Liu Acked-by: Steven Rostedt (Google) # for kernel/trace/ Reviewed-by: Martin K. Petersen # SCSI Reviewed-by: Darrick J. Wong # xfs Acked-by: Jani Nikula Acked-by: Corey Minyard Acked-by: Wei Liu Acked-by: Thomas Gleixner Reviewed-by: Bill O'Donnell Acked-by: Baoquan He Acked-by: Ashutosh Dixit Acked-by: Anna Schumaker Signed-off-by: Joel Granados