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Merge branch 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull locking fixes from Ingo Molnar: "Two fixes: tighten up a jump-labels warning to not trigger on certain modules and fix confusing (and non-existent) mutex API documentation" * 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: jump_label: Disable jump labels in __exit code locking/mutex: Improve documentation
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commit
6bacf66077
4 changed files with 37 additions and 13 deletions
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@ -151,7 +151,7 @@ extern struct jump_entry __start___jump_table[];
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extern struct jump_entry __stop___jump_table[];
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extern void jump_label_init(void);
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extern void jump_label_invalidate_init(void);
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extern void jump_label_invalidate_initmem(void);
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extern void jump_label_lock(void);
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extern void jump_label_unlock(void);
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extern void arch_jump_label_transform(struct jump_entry *entry,
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@ -199,7 +199,7 @@ static __always_inline void jump_label_init(void)
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static_key_initialized = true;
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}
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static inline void jump_label_invalidate_init(void) {}
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static inline void jump_label_invalidate_initmem(void) {}
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static __always_inline bool static_key_false(struct static_key *key)
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{
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@ -1001,7 +1001,7 @@ static int __ref kernel_init(void *unused)
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/* need to finish all async __init code before freeing the memory */
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async_synchronize_full();
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ftrace_free_init_mem();
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jump_label_invalidate_init();
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jump_label_invalidate_initmem();
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free_initmem();
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mark_readonly();
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system_state = SYSTEM_RUNNING;
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@ -16,6 +16,7 @@
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#include <linux/jump_label_ratelimit.h>
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#include <linux/bug.h>
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#include <linux/cpu.h>
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#include <asm/sections.h>
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#ifdef HAVE_JUMP_LABEL
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@ -421,15 +422,15 @@ void __init jump_label_init(void)
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cpus_read_unlock();
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}
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/* Disable any jump label entries in __init code */
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void __init jump_label_invalidate_init(void)
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/* Disable any jump label entries in __init/__exit code */
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void __init jump_label_invalidate_initmem(void)
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{
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struct jump_entry *iter_start = __start___jump_table;
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struct jump_entry *iter_stop = __stop___jump_table;
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struct jump_entry *iter;
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for (iter = iter_start; iter < iter_stop; iter++) {
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if (init_kernel_text(iter->code))
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if (init_section_contains((void *)(unsigned long)iter->code, 1))
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iter->code = 0;
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}
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}
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@ -1082,15 +1082,16 @@ static noinline int __sched
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__mutex_lock_interruptible_slowpath(struct mutex *lock);
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/**
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* mutex_lock_interruptible - acquire the mutex, interruptible
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* @lock: the mutex to be acquired
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* mutex_lock_interruptible() - Acquire the mutex, interruptible by signals.
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* @lock: The mutex to be acquired.
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*
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* Lock the mutex like mutex_lock(), and return 0 if the mutex has
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* been acquired or sleep until the mutex becomes available. If a
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* signal arrives while waiting for the lock then this function
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* returns -EINTR.
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* Lock the mutex like mutex_lock(). If a signal is delivered while the
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* process is sleeping, this function will return without acquiring the
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* mutex.
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*
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* This function is similar to (but not equivalent to) down_interruptible().
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* Context: Process context.
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* Return: 0 if the lock was successfully acquired or %-EINTR if a
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* signal arrived.
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*/
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int __sched mutex_lock_interruptible(struct mutex *lock)
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{
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@ -1104,6 +1105,18 @@ int __sched mutex_lock_interruptible(struct mutex *lock)
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EXPORT_SYMBOL(mutex_lock_interruptible);
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/**
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* mutex_lock_killable() - Acquire the mutex, interruptible by fatal signals.
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* @lock: The mutex to be acquired.
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*
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* Lock the mutex like mutex_lock(). If a signal which will be fatal to
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* the current process is delivered while the process is sleeping, this
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* function will return without acquiring the mutex.
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*
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* Context: Process context.
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* Return: 0 if the lock was successfully acquired or %-EINTR if a
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* fatal signal arrived.
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*/
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int __sched mutex_lock_killable(struct mutex *lock)
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{
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might_sleep();
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@ -1115,6 +1128,16 @@ int __sched mutex_lock_killable(struct mutex *lock)
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}
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EXPORT_SYMBOL(mutex_lock_killable);
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/**
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* mutex_lock_io() - Acquire the mutex and mark the process as waiting for I/O
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* @lock: The mutex to be acquired.
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*
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* Lock the mutex like mutex_lock(). While the task is waiting for this
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* mutex, it will be accounted as being in the IO wait state by the
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* scheduler.
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*
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* Context: Process context.
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*/
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void __sched mutex_lock_io(struct mutex *lock)
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{
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int token;
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