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SubjectRe: [PATCH v2] genpd: Fix up terminology with parent/child
On Thu, 9 Jul 2020 at 14:25, Rafael J. Wysocki <rafael@kernel.org> wrote:
>
> On Thu, Jul 9, 2020 at 1:32 AM Kees Cook <keescook@chromium.org> wrote:
> >
> > The genpd infrastructure uses the terms master/slave, but such uses have
> > no external exposures (not even in Documentation/driver-api/pm/*) and are
> > not mandated by nor associated with any external specifications. Change
> > the language used through-out to parent/child.
> >
> > There was one possible exception in the debugfs node
> > "pm_genpd/pm_genpd_summary" but its path has no hits outside of the
> > kernel itself when performing a code search[1], and it seems even this
> > single usage has been non-functional since it was introduced due to a
> > typo in the Python ("apend" instead of correct "append"). Fix the typo
> > while we're at it.
> >
> > [1] https://codesearch.debian.net/
> >
> > Signed-off-by: Kees Cook <keescook@chromium.org>
>
> Applied as 5.9 material with a minor subject edit, thanks!

If not too late, feel free to add my ack to the patch.

Kind regards
Uffe

>
> > ---
> > v2: leader/follower -> parent/child (ulf, rafael)
> > v1: https://lore.kernel.org/lkml/202007080131.3E6D0858@keescook
> > This is motivated by the recent discussions over coding style:
> > https://lore.kernel.org/lkml/159419296487.2464622.863943877093636532.stgit@dwillia2-desk3.amr.corp.intel.com/
> > ---
> > drivers/base/power/domain.c | 194 +++++++++++++--------------
> > drivers/base/power/domain_governor.c | 12 +-
> > include/linux/pm_domain.h | 12 +-
> > scripts/gdb/linux/genpd.py | 12 +-
> > 4 files changed, 115 insertions(+), 115 deletions(-)
> >
> > diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
> > index 0a01df608849..2cb5e04cf86c 100644
> > --- a/drivers/base/power/domain.c
> > +++ b/drivers/base/power/domain.c
> > @@ -263,18 +263,18 @@ static int _genpd_reeval_performance_state(struct generic_pm_domain *genpd,
> > /*
> > * Traverse all sub-domains within the domain. This can be
> > * done without any additional locking as the link->performance_state
> > - * field is protected by the master genpd->lock, which is already taken.
> > + * field is protected by the parent genpd->lock, which is already taken.
> > *
> > * Also note that link->performance_state (subdomain's performance state
> > - * requirement to master domain) is different from
> > - * link->slave->performance_state (current performance state requirement
> > + * requirement to parent domain) is different from
> > + * link->child->performance_state (current performance state requirement
> > * of the devices/sub-domains of the subdomain) and so can have a
> > * different value.
> > *
> > * Note that we also take vote from powered-off sub-domains into account
> > * as the same is done for devices right now.
> > */
> > - list_for_each_entry(link, &genpd->master_links, master_node) {
> > + list_for_each_entry(link, &genpd->parent_links, parent_node) {
> > if (link->performance_state > state)
> > state = link->performance_state;
> > }
> > @@ -285,40 +285,40 @@ static int _genpd_reeval_performance_state(struct generic_pm_domain *genpd,
> > static int _genpd_set_performance_state(struct generic_pm_domain *genpd,
> > unsigned int state, int depth)
> > {
> > - struct generic_pm_domain *master;
> > + struct generic_pm_domain *parent;
> > struct gpd_link *link;
> > - int master_state, ret;
> > + int parent_state, ret;
> >
> > if (state == genpd->performance_state)
> > return 0;
> >
> > - /* Propagate to masters of genpd */
> > - list_for_each_entry(link, &genpd->slave_links, slave_node) {
> > - master = link->master;
> > + /* Propagate to parents of genpd */
> > + list_for_each_entry(link, &genpd->child_links, child_node) {
> > + parent = link->parent;
> >
> > - if (!master->set_performance_state)
> > + if (!parent->set_performance_state)
> > continue;
> >
> > - /* Find master's performance state */
> > + /* Find parent's performance state */
> > ret = dev_pm_opp_xlate_performance_state(genpd->opp_table,
> > - master->opp_table,
> > + parent->opp_table,
> > state);
> > if (unlikely(ret < 0))
> > goto err;
> >
> > - master_state = ret;
> > + parent_state = ret;
> >
> > - genpd_lock_nested(master, depth + 1);
> > + genpd_lock_nested(parent, depth + 1);
> >
> > link->prev_performance_state = link->performance_state;
> > - link->performance_state = master_state;
> > - master_state = _genpd_reeval_performance_state(master,
> > - master_state);
> > - ret = _genpd_set_performance_state(master, master_state, depth + 1);
> > + link->performance_state = parent_state;
> > + parent_state = _genpd_reeval_performance_state(parent,
> > + parent_state);
> > + ret = _genpd_set_performance_state(parent, parent_state, depth + 1);
> > if (ret)
> > link->performance_state = link->prev_performance_state;
> >
> > - genpd_unlock(master);
> > + genpd_unlock(parent);
> >
> > if (ret)
> > goto err;
> > @@ -333,26 +333,26 @@ static int _genpd_set_performance_state(struct generic_pm_domain *genpd,
> >
> > err:
> > /* Encountered an error, lets rollback */
> > - list_for_each_entry_continue_reverse(link, &genpd->slave_links,
> > - slave_node) {
> > - master = link->master;
> > + list_for_each_entry_continue_reverse(link, &genpd->child_links,
> > + child_node) {
> > + parent = link->parent;
> >
> > - if (!master->set_performance_state)
> > + if (!parent->set_performance_state)
> > continue;
> >
> > - genpd_lock_nested(master, depth + 1);
> > + genpd_lock_nested(parent, depth + 1);
> >
> > - master_state = link->prev_performance_state;
> > - link->performance_state = master_state;
> > + parent_state = link->prev_performance_state;
> > + link->performance_state = parent_state;
> >
> > - master_state = _genpd_reeval_performance_state(master,
> > - master_state);
> > - if (_genpd_set_performance_state(master, master_state, depth + 1)) {
> > + parent_state = _genpd_reeval_performance_state(parent,
> > + parent_state);
> > + if (_genpd_set_performance_state(parent, parent_state, depth + 1)) {
> > pr_err("%s: Failed to roll back to %d performance state\n",
> > - master->name, master_state);
> > + parent->name, parent_state);
> > }
> >
> > - genpd_unlock(master);
> > + genpd_unlock(parent);
> > }
> >
> > return ret;
> > @@ -552,7 +552,7 @@ static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on,
> >
> > /*
> > * If sd_count > 0 at this point, one of the subdomains hasn't
> > - * managed to call genpd_power_on() for the master yet after
> > + * managed to call genpd_power_on() for the parent yet after
> > * incrementing it. In that case genpd_power_on() will wait
> > * for us to drop the lock, so we can call .power_off() and let
> > * the genpd_power_on() restore power for us (this shouldn't
> > @@ -566,22 +566,22 @@ static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on,
> > genpd->status = GPD_STATE_POWER_OFF;
> > genpd_update_accounting(genpd);
> >
> > - list_for_each_entry(link, &genpd->slave_links, slave_node) {
> > - genpd_sd_counter_dec(link->master);
> > - genpd_lock_nested(link->master, depth + 1);
> > - genpd_power_off(link->master, false, depth + 1);
> > - genpd_unlock(link->master);
> > + list_for_each_entry(link, &genpd->child_links, child_node) {
> > + genpd_sd_counter_dec(link->parent);
> > + genpd_lock_nested(link->parent, depth + 1);
> > + genpd_power_off(link->parent, false, depth + 1);
> > + genpd_unlock(link->parent);
> > }
> >
> > return 0;
> > }
> >
> > /**
> > - * genpd_power_on - Restore power to a given PM domain and its masters.
> > + * genpd_power_on - Restore power to a given PM domain and its parents.
> > * @genpd: PM domain to power up.
> > * @depth: nesting count for lockdep.
> > *
> > - * Restore power to @genpd and all of its masters so that it is possible to
> > + * Restore power to @genpd and all of its parents so that it is possible to
> > * resume a device belonging to it.
> > */
> > static int genpd_power_on(struct generic_pm_domain *genpd, unsigned int depth)
> > @@ -594,20 +594,20 @@ static int genpd_power_on(struct generic_pm_domain *genpd, unsigned int depth)
> >
> > /*
> > * The list is guaranteed not to change while the loop below is being
> > - * executed, unless one of the masters' .power_on() callbacks fiddles
> > + * executed, unless one of the parents' .power_on() callbacks fiddles
> > * with it.
> > */
> > - list_for_each_entry(link, &genpd->slave_links, slave_node) {
> > - struct generic_pm_domain *master = link->master;
> > + list_for_each_entry(link, &genpd->child_links, child_node) {
> > + struct generic_pm_domain *parent = link->parent;
> >
> > - genpd_sd_counter_inc(master);
> > + genpd_sd_counter_inc(parent);
> >
> > - genpd_lock_nested(master, depth + 1);
> > - ret = genpd_power_on(master, depth + 1);
> > - genpd_unlock(master);
> > + genpd_lock_nested(parent, depth + 1);
> > + ret = genpd_power_on(parent, depth + 1);
> > + genpd_unlock(parent);
> >
> > if (ret) {
> > - genpd_sd_counter_dec(master);
> > + genpd_sd_counter_dec(parent);
> > goto err;
> > }
> > }
> > @@ -623,12 +623,12 @@ static int genpd_power_on(struct generic_pm_domain *genpd, unsigned int depth)
> >
> > err:
> > list_for_each_entry_continue_reverse(link,
> > - &genpd->slave_links,
> > - slave_node) {
> > - genpd_sd_counter_dec(link->master);
> > - genpd_lock_nested(link->master, depth + 1);
> > - genpd_power_off(link->master, false, depth + 1);
> > - genpd_unlock(link->master);
> > + &genpd->child_links,
> > + child_node) {
> > + genpd_sd_counter_dec(link->parent);
> > + genpd_lock_nested(link->parent, depth + 1);
> > + genpd_power_off(link->parent, false, depth + 1);
> > + genpd_unlock(link->parent);
> > }
> >
> > return ret;
> > @@ -932,13 +932,13 @@ late_initcall(genpd_power_off_unused);
> > #ifdef CONFIG_PM_SLEEP
> >
> > /**
> > - * genpd_sync_power_off - Synchronously power off a PM domain and its masters.
> > + * genpd_sync_power_off - Synchronously power off a PM domain and its parents.
> > * @genpd: PM domain to power off, if possible.
> > * @use_lock: use the lock.
> > * @depth: nesting count for lockdep.
> > *
> > * Check if the given PM domain can be powered off (during system suspend or
> > - * hibernation) and do that if so. Also, in that case propagate to its masters.
> > + * hibernation) and do that if so. Also, in that case propagate to its parents.
> > *
> > * This function is only called in "noirq" and "syscore" stages of system power
> > * transitions. The "noirq" callbacks may be executed asynchronously, thus in
> > @@ -963,21 +963,21 @@ static void genpd_sync_power_off(struct generic_pm_domain *genpd, bool use_lock,
> >
> > genpd->status = GPD_STATE_POWER_OFF;
> >
> > - list_for_each_entry(link, &genpd->slave_links, slave_node) {
> > - genpd_sd_counter_dec(link->master);
> > + list_for_each_entry(link, &genpd->child_links, child_node) {
> > + genpd_sd_counter_dec(link->parent);
> >
> > if (use_lock)
> > - genpd_lock_nested(link->master, depth + 1);
> > + genpd_lock_nested(link->parent, depth + 1);
> >
> > - genpd_sync_power_off(link->master, use_lock, depth + 1);
> > + genpd_sync_power_off(link->parent, use_lock, depth + 1);
> >
> > if (use_lock)
> > - genpd_unlock(link->master);
> > + genpd_unlock(link->parent);
> > }
> > }
> >
> > /**
> > - * genpd_sync_power_on - Synchronously power on a PM domain and its masters.
> > + * genpd_sync_power_on - Synchronously power on a PM domain and its parents.
> > * @genpd: PM domain to power on.
> > * @use_lock: use the lock.
> > * @depth: nesting count for lockdep.
> > @@ -994,16 +994,16 @@ static void genpd_sync_power_on(struct generic_pm_domain *genpd, bool use_lock,
> > if (genpd_status_on(genpd))
> > return;
> >
> > - list_for_each_entry(link, &genpd->slave_links, slave_node) {
> > - genpd_sd_counter_inc(link->master);
> > + list_for_each_entry(link, &genpd->child_links, child_node) {
> > + genpd_sd_counter_inc(link->parent);
> >
> > if (use_lock)
> > - genpd_lock_nested(link->master, depth + 1);
> > + genpd_lock_nested(link->parent, depth + 1);
> >
> > - genpd_sync_power_on(link->master, use_lock, depth + 1);
> > + genpd_sync_power_on(link->parent, use_lock, depth + 1);
> >
> > if (use_lock)
> > - genpd_unlock(link->master);
> > + genpd_unlock(link->parent);
> > }
> >
> > _genpd_power_on(genpd, false);
> > @@ -1443,12 +1443,12 @@ static void genpd_update_cpumask(struct generic_pm_domain *genpd,
> > if (!genpd_is_cpu_domain(genpd))
> > return;
> >
> > - list_for_each_entry(link, &genpd->slave_links, slave_node) {
> > - struct generic_pm_domain *master = link->master;
> > + list_for_each_entry(link, &genpd->child_links, child_node) {
> > + struct generic_pm_domain *parent = link->parent;
> >
> > - genpd_lock_nested(master, depth + 1);
> > - genpd_update_cpumask(master, cpu, set, depth + 1);
> > - genpd_unlock(master);
> > + genpd_lock_nested(parent, depth + 1);
> > + genpd_update_cpumask(parent, cpu, set, depth + 1);
> > + genpd_unlock(parent);
> > }
> >
> > if (set)
> > @@ -1636,17 +1636,17 @@ static int genpd_add_subdomain(struct generic_pm_domain *genpd,
> > goto out;
> > }
> >
> > - list_for_each_entry(itr, &genpd->master_links, master_node) {
> > - if (itr->slave == subdomain && itr->master == genpd) {
> > + list_for_each_entry(itr, &genpd->parent_links, parent_node) {
> > + if (itr->child == subdomain && itr->parent == genpd) {
> > ret = -EINVAL;
> > goto out;
> > }
> > }
> >
> > - link->master = genpd;
> > - list_add_tail(&link->master_node, &genpd->master_links);
> > - link->slave = subdomain;
> > - list_add_tail(&link->slave_node, &subdomain->slave_links);
> > + link->parent = genpd;
> > + list_add_tail(&link->parent_node, &genpd->parent_links);
> > + link->child = subdomain;
> > + list_add_tail(&link->child_node, &subdomain->child_links);
> > if (genpd_status_on(subdomain))
> > genpd_sd_counter_inc(genpd);
> >
> > @@ -1660,7 +1660,7 @@ static int genpd_add_subdomain(struct generic_pm_domain *genpd,
> >
> > /**
> > * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain.
> > - * @genpd: Master PM domain to add the subdomain to.
> > + * @genpd: Leader PM domain to add the subdomain to.
> > * @subdomain: Subdomain to be added.
> > */
> > int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
> > @@ -1678,7 +1678,7 @@ EXPORT_SYMBOL_GPL(pm_genpd_add_subdomain);
> >
> > /**
> > * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain.
> > - * @genpd: Master PM domain to remove the subdomain from.
> > + * @genpd: Leader PM domain to remove the subdomain from.
> > * @subdomain: Subdomain to be removed.
> > */
> > int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
> > @@ -1693,19 +1693,19 @@ int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
> > genpd_lock(subdomain);
> > genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING);
> >
> > - if (!list_empty(&subdomain->master_links) || subdomain->device_count) {
> > + if (!list_empty(&subdomain->parent_links) || subdomain->device_count) {
> > pr_warn("%s: unable to remove subdomain %s\n",
> > genpd->name, subdomain->name);
> > ret = -EBUSY;
> > goto out;
> > }
> >
> > - list_for_each_entry_safe(link, l, &genpd->master_links, master_node) {
> > - if (link->slave != subdomain)
> > + list_for_each_entry_safe(link, l, &genpd->parent_links, parent_node) {
> > + if (link->child != subdomain)
> > continue;
> >
> > - list_del(&link->master_node);
> > - list_del(&link->slave_node);
> > + list_del(&link->parent_node);
> > + list_del(&link->child_node);
> > kfree(link);
> > if (genpd_status_on(subdomain))
> > genpd_sd_counter_dec(genpd);
> > @@ -1770,8 +1770,8 @@ int pm_genpd_init(struct generic_pm_domain *genpd,
> > if (IS_ERR_OR_NULL(genpd))
> > return -EINVAL;
> >
> > - INIT_LIST_HEAD(&genpd->master_links);
> > - INIT_LIST_HEAD(&genpd->slave_links);
> > + INIT_LIST_HEAD(&genpd->parent_links);
> > + INIT_LIST_HEAD(&genpd->child_links);
> > INIT_LIST_HEAD(&genpd->dev_list);
> > genpd_lock_init(genpd);
> > genpd->gov = gov;
> > @@ -1848,15 +1848,15 @@ static int genpd_remove(struct generic_pm_domain *genpd)
> > return -EBUSY;
> > }
> >
> > - if (!list_empty(&genpd->master_links) || genpd->device_count) {
> > + if (!list_empty(&genpd->parent_links) || genpd->device_count) {
> > genpd_unlock(genpd);
> > pr_err("%s: unable to remove %s\n", __func__, genpd->name);
> > return -EBUSY;
> > }
> >
> > - list_for_each_entry_safe(link, l, &genpd->slave_links, slave_node) {
> > - list_del(&link->master_node);
> > - list_del(&link->slave_node);
> > + list_for_each_entry_safe(link, l, &genpd->child_links, child_node) {
> > + list_del(&link->parent_node);
> > + list_del(&link->child_node);
> > kfree(link);
> > }
> >
> > @@ -2827,12 +2827,12 @@ static int genpd_summary_one(struct seq_file *s,
> >
> > /*
> > * Modifications on the list require holding locks on both
> > - * master and slave, so we are safe.
> > + * parent and child, so we are safe.
> > * Also genpd->name is immutable.
> > */
> > - list_for_each_entry(link, &genpd->master_links, master_node) {
> > - seq_printf(s, "%s", link->slave->name);
> > - if (!list_is_last(&link->master_node, &genpd->master_links))
> > + list_for_each_entry(link, &genpd->parent_links, parent_node) {
> > + seq_printf(s, "%s", link->child->name);
> > + if (!list_is_last(&link->parent_node, &genpd->parent_links))
> > seq_puts(s, ", ");
> > }
> >
> > @@ -2860,7 +2860,7 @@ static int summary_show(struct seq_file *s, void *data)
> > struct generic_pm_domain *genpd;
> > int ret = 0;
> >
> > - seq_puts(s, "domain status slaves\n");
> > + seq_puts(s, "domain status children\n");
> > seq_puts(s, " /device runtime status\n");
> > seq_puts(s, "----------------------------------------------------------------------\n");
> >
> > @@ -2915,8 +2915,8 @@ static int sub_domains_show(struct seq_file *s, void *data)
> > if (ret)
> > return -ERESTARTSYS;
> >
> > - list_for_each_entry(link, &genpd->master_links, master_node)
> > - seq_printf(s, "%s\n", link->slave->name);
> > + list_for_each_entry(link, &genpd->parent_links, parent_node)
> > + seq_printf(s, "%s\n", link->child->name);
> >
> > genpd_unlock(genpd);
> > return ret;
> > diff --git a/drivers/base/power/domain_governor.c b/drivers/base/power/domain_governor.c
> > index daa8c7689f7e..490ed7deb99a 100644
> > --- a/drivers/base/power/domain_governor.c
> > +++ b/drivers/base/power/domain_governor.c
> > @@ -135,8 +135,8 @@ static bool __default_power_down_ok(struct dev_pm_domain *pd,
> > *
> > * All subdomains have been powered off already at this point.
> > */
> > - list_for_each_entry(link, &genpd->master_links, master_node) {
> > - struct generic_pm_domain *sd = link->slave;
> > + list_for_each_entry(link, &genpd->parent_links, parent_node) {
> > + struct generic_pm_domain *sd = link->child;
> > s64 sd_max_off_ns = sd->max_off_time_ns;
> >
> > if (sd_max_off_ns < 0)
> > @@ -217,13 +217,13 @@ static bool default_power_down_ok(struct dev_pm_domain *pd)
> > }
> >
> > /*
> > - * We have to invalidate the cached results for the masters, so
> > + * We have to invalidate the cached results for the parents, so
> > * use the observation that default_power_down_ok() is not
> > - * going to be called for any master until this instance
> > + * going to be called for any parent until this instance
> > * returns.
> > */
> > - list_for_each_entry(link, &genpd->slave_links, slave_node)
> > - link->master->max_off_time_changed = true;
> > + list_for_each_entry(link, &genpd->child_links, child_node)
> > + link->parent->max_off_time_changed = true;
> >
> > genpd->max_off_time_ns = -1;
> > genpd->max_off_time_changed = false;
> > diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
> > index 9ec78ee53652..574a1fadb1e5 100644
> > --- a/include/linux/pm_domain.h
> > +++ b/include/linux/pm_domain.h
> > @@ -95,8 +95,8 @@ struct generic_pm_domain {
> > struct device dev;
> > struct dev_pm_domain domain; /* PM domain operations */
> > struct list_head gpd_list_node; /* Node in the global PM domains list */
> > - struct list_head master_links; /* Links with PM domain as a master */
> > - struct list_head slave_links; /* Links with PM domain as a slave */
> > + struct list_head parent_links; /* Links with PM domain as a parent */
> > + struct list_head child_links;/* Links with PM domain as a child */
> > struct list_head dev_list; /* List of devices */
> > struct dev_power_governor *gov;
> > struct work_struct power_off_work;
> > @@ -151,10 +151,10 @@ static inline struct generic_pm_domain *pd_to_genpd(struct dev_pm_domain *pd)
> > }
> >
> > struct gpd_link {
> > - struct generic_pm_domain *master;
> > - struct list_head master_node;
> > - struct generic_pm_domain *slave;
> > - struct list_head slave_node;
> > + struct generic_pm_domain *parent;
> > + struct list_head parent_node;
> > + struct generic_pm_domain *child;
> > + struct list_head child_node;
> >
> > /* Sub-domain's per-master domain performance state */
> > unsigned int performance_state;
> > diff --git a/scripts/gdb/linux/genpd.py b/scripts/gdb/linux/genpd.py
> > index 6ca93bd2949e..39cd1abd8559 100644
> > --- a/scripts/gdb/linux/genpd.py
> > +++ b/scripts/gdb/linux/genpd.py
> > @@ -49,17 +49,17 @@ Output is similar to /sys/kernel/debug/pm_genpd/pm_genpd_summary'''
> > else:
> > status_string = 'off-{}'.format(genpd['state_idx'])
> >
> > - slave_names = []
> > + child_names = []
> > for link in list_for_each_entry(
> > - genpd['master_links'],
> > + genpd['parent_links'],
> > device_link_type.get_type().pointer(),
> > - 'master_node'):
> > - slave_names.apend(link['slave']['name'])
> > + 'parent_node'):
> > + child_names.append(link['child']['name'])
> >
> > gdb.write('%-30s %-15s %s\n' % (
> > genpd['name'].string(),
> > status_string,
> > - ', '.join(slave_names)))
> > + ', '.join(child_names)))
> >
> > # Print devices in domain
> > for pm_data in list_for_each_entry(genpd['dev_list'],
> > @@ -70,7 +70,7 @@ Output is similar to /sys/kernel/debug/pm_genpd/pm_genpd_summary'''
> > gdb.write(' %-50s %s\n' % (kobj_path, rtpm_status_str(dev)))
> >
> > def invoke(self, arg, from_tty):
> > - gdb.write('domain status slaves\n');
> > + gdb.write('domain status children\n');
> > gdb.write(' /device runtime status\n');
> > gdb.write('----------------------------------------------------------------------\n');
> > for genpd in list_for_each_entry(
> > --
> > 2.25.1
> >
> >
> > --
> > Kees Cook

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