cregit-Linux how code gets into the kernel

Release 4.15 kernel/user-return-notifier.c

Directory: kernel
#include <linux/user-return-notifier.h>
#include <linux/percpu.h>
#include <linux/sched.h>
#include <linux/export.h>

static DEFINE_PER_CPU(struct hlist_head, return_notifier_list);

/*
 * Request a notification when the current cpu returns to userspace.  Must be
 * called in atomic context.  The notifier will also be called in atomic
 * context.
 */

void user_return_notifier_register(struct user_return_notifier *urn) { set_tsk_thread_flag(current, TIF_USER_RETURN_NOTIFY); hlist_add_head(&urn->link, this_cpu_ptr(&return_notifier_list)); }

Contributors

PersonTokensPropCommitsCommitProp
Avi Kivity2993.55%266.67%
Christoph Lameter26.45%133.33%
Total31100.00%3100.00%

EXPORT_SYMBOL_GPL(user_return_notifier_register); /* * Removes a registered user return notifier. Must be called from atomic * context, and from the same cpu registration occurred in. */
void user_return_notifier_unregister(struct user_return_notifier *urn) { hlist_del(&urn->link); if (hlist_empty(this_cpu_ptr(&return_notifier_list))) clear_tsk_thread_flag(current, TIF_USER_RETURN_NOTIFY); }

Contributors

PersonTokensPropCommitsCommitProp
Avi Kivity3494.44%266.67%
Christoph Lameter25.56%133.33%
Total36100.00%3100.00%

EXPORT_SYMBOL_GPL(user_return_notifier_unregister); /* Calls registered user return notifiers */
void fire_user_return_notifiers(void) { struct user_return_notifier *urn; struct hlist_node *tmp2; struct hlist_head *head; head = &get_cpu_var(return_notifier_list); hlist_for_each_entry_safe(urn, tmp2, head, link) urn->on_user_return(urn); put_cpu_var(return_notifier_list); }

Contributors

PersonTokensPropCommitsCommitProp
Avi Kivity4994.23%150.00%
Stephen Rothwell35.77%150.00%
Total52100.00%2100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Avi Kivity14494.12%233.33%
Christoph Lameter42.61%116.67%
Stephen Rothwell31.96%116.67%
Lucas De Marchi10.65%116.67%
Paul Gortmaker10.65%116.67%
Total153100.00%6100.00%
Directory: kernel
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