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
This commit is contained in:
Linus Torvalds 2018-03-25 07:18:31 -10:00
commit 6bacf66077
4 changed files with 37 additions and 13 deletions

View File

@ -151,7 +151,7 @@ extern struct jump_entry __start___jump_table[];
extern struct jump_entry __stop___jump_table[];
extern void jump_label_init(void);
extern void jump_label_invalidate_init(void);
extern void jump_label_invalidate_initmem(void);
extern void jump_label_lock(void);
extern void jump_label_unlock(void);
extern void arch_jump_label_transform(struct jump_entry *entry,
@ -199,7 +199,7 @@ static __always_inline void jump_label_init(void)
static_key_initialized = true;
}
static inline void jump_label_invalidate_init(void) {}
static inline void jump_label_invalidate_initmem(void) {}
static __always_inline bool static_key_false(struct static_key *key)
{

View File

@ -1001,7 +1001,7 @@ static int __ref kernel_init(void *unused)
/* need to finish all async __init code before freeing the memory */
async_synchronize_full();
ftrace_free_init_mem();
jump_label_invalidate_init();
jump_label_invalidate_initmem();
free_initmem();
mark_readonly();
system_state = SYSTEM_RUNNING;

View File

@ -16,6 +16,7 @@
#include <linux/jump_label_ratelimit.h>
#include <linux/bug.h>
#include <linux/cpu.h>
#include <asm/sections.h>
#ifdef HAVE_JUMP_LABEL
@ -421,15 +422,15 @@ void __init jump_label_init(void)
cpus_read_unlock();
}
/* Disable any jump label entries in __init code */
void __init jump_label_invalidate_init(void)
/* Disable any jump label entries in __init/__exit code */
void __init jump_label_invalidate_initmem(void)
{
struct jump_entry *iter_start = __start___jump_table;
struct jump_entry *iter_stop = __stop___jump_table;
struct jump_entry *iter;
for (iter = iter_start; iter < iter_stop; iter++) {
if (init_kernel_text(iter->code))
if (init_section_contains((void *)(unsigned long)iter->code, 1))
iter->code = 0;
}
}

View File

@ -1082,15 +1082,16 @@ static noinline int __sched
__mutex_lock_interruptible_slowpath(struct mutex *lock);
/**
* mutex_lock_interruptible - acquire the mutex, interruptible
* @lock: the mutex to be acquired
* mutex_lock_interruptible() - Acquire the mutex, interruptible by signals.
* @lock: The mutex to be acquired.
*
* Lock the mutex like mutex_lock(), and return 0 if the mutex has
* been acquired or sleep until the mutex becomes available. If a
* signal arrives while waiting for the lock then this function
* returns -EINTR.
* Lock the mutex like mutex_lock(). If a signal is delivered while the
* process is sleeping, this function will return without acquiring the
* mutex.
*
* This function is similar to (but not equivalent to) down_interruptible().
* Context: Process context.
* Return: 0 if the lock was successfully acquired or %-EINTR if a
* signal arrived.
*/
int __sched mutex_lock_interruptible(struct mutex *lock)
{
@ -1104,6 +1105,18 @@ int __sched mutex_lock_interruptible(struct mutex *lock)
EXPORT_SYMBOL(mutex_lock_interruptible);
/**
* mutex_lock_killable() - Acquire the mutex, interruptible by fatal signals.
* @lock: The mutex to be acquired.
*
* Lock the mutex like mutex_lock(). If a signal which will be fatal to
* the current process is delivered while the process is sleeping, this
* function will return without acquiring the mutex.
*
* Context: Process context.
* Return: 0 if the lock was successfully acquired or %-EINTR if a
* fatal signal arrived.
*/
int __sched mutex_lock_killable(struct mutex *lock)
{
might_sleep();
@ -1115,6 +1128,16 @@ int __sched mutex_lock_killable(struct mutex *lock)
}
EXPORT_SYMBOL(mutex_lock_killable);
/**
* mutex_lock_io() - Acquire the mutex and mark the process as waiting for I/O
* @lock: The mutex to be acquired.
*
* Lock the mutex like mutex_lock(). While the task is waiting for this
* mutex, it will be accounted as being in the IO wait state by the
* scheduler.
*
* Context: Process context.
*/
void __sched mutex_lock_io(struct mutex *lock)
{
int token;