diff --git a/Documentation/power/runtime_pm.rst b/Documentation/power/runtime_pm.rst index ab8406c84254..0553008b6279 100644 --- a/Documentation/power/runtime_pm.rst +++ b/Documentation/power/runtime_pm.rst @@ -382,6 +382,12 @@ drivers/base/power/runtime.c and include/linux/pm_runtime.h: nonzero, increment the counter and return 1; otherwise return 0 without changing the counter + `int pm_runtime_get_if_active(struct device *dev, bool ign_usage_count);` + - return -EINVAL if 'power.disable_depth' is nonzero; otherwise, if the + runtime PM status is RPM_ACTIVE, and either ign_usage_count is true + or the device's usage_count is non-zero, increment the counter and + return 1; otherwise return 0 without changing the counter + `void pm_runtime_put_noidle(struct device *dev);` - decrement the device's usage counter diff --git a/Documentation/power/userland-swsusp.rst b/Documentation/power/userland-swsusp.rst index a0fa51bb1a4d..1cf62d80a9ca 100644 --- a/Documentation/power/userland-swsusp.rst +++ b/Documentation/power/userland-swsusp.rst @@ -69,11 +69,13 @@ SNAPSHOT_PREF_IMAGE_SIZE SNAPSHOT_GET_IMAGE_SIZE return the actual size of the hibernation image + (the last argument should be a pointer to a loff_t variable that + will contain the result if the call is successful) SNAPSHOT_AVAIL_SWAP_SIZE - return the amount of available swap in bytes (the - last argument should be a pointer to an unsigned int variable that will - contain the result if the call is successful). + return the amount of available swap in bytes + (the last argument should be a pointer to a loff_t variable that + will contain the result if the call is successful) SNAPSHOT_ALLOC_SWAP_PAGE allocate a swap page from the resume partition diff --git a/drivers/acpi/acpica/achware.h b/drivers/acpi/acpica/achware.h index 6ad0517553d5..ebf6453d0e21 100644 --- a/drivers/acpi/acpica/achware.h +++ b/drivers/acpi/acpica/achware.h @@ -101,7 +101,7 @@ acpi_status acpi_hw_enable_all_runtime_gpes(void); acpi_status acpi_hw_enable_all_wakeup_gpes(void); -u8 acpi_hw_check_all_gpes(void); +u8 acpi_hw_check_all_gpes(acpi_handle gpe_skip_device, u32 gpe_skip_number); acpi_status acpi_hw_enable_runtime_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info, diff --git a/drivers/acpi/acpica/evxfgpe.c b/drivers/acpi/acpica/evxfgpe.c index f2de66bfd8a7..3be60673e461 100644 --- a/drivers/acpi/acpica/evxfgpe.c +++ b/drivers/acpi/acpica/evxfgpe.c @@ -799,17 +799,19 @@ ACPI_EXPORT_SYMBOL(acpi_enable_all_wakeup_gpes) * * FUNCTION: acpi_any_gpe_status_set * - * PARAMETERS: None + * PARAMETERS: gpe_skip_number - Number of the GPE to skip * * RETURN: Whether or not the status bit is set for any GPE * - * DESCRIPTION: Check the status bits of all enabled GPEs and return TRUE if any - * of them is set or FALSE otherwise. + * DESCRIPTION: Check the status bits of all enabled GPEs, except for the one + * represented by the "skip" argument, and return TRUE if any of + * them is set or FALSE otherwise. * ******************************************************************************/ -u32 acpi_any_gpe_status_set(void) +u32 acpi_any_gpe_status_set(u32 gpe_skip_number) { acpi_status status; + acpi_handle gpe_device; u8 ret; ACPI_FUNCTION_TRACE(acpi_any_gpe_status_set); @@ -819,7 +821,12 @@ u32 acpi_any_gpe_status_set(void) return (FALSE); } - ret = acpi_hw_check_all_gpes(); + status = acpi_get_gpe_device(gpe_skip_number, &gpe_device); + if (ACPI_FAILURE(status)) { + gpe_device = NULL; + } + + ret = acpi_hw_check_all_gpes(gpe_device, gpe_skip_number); (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); return (ret); diff --git a/drivers/acpi/acpica/hwgpe.c b/drivers/acpi/acpica/hwgpe.c index f4c285c2f595..49c46d4dd070 100644 --- a/drivers/acpi/acpica/hwgpe.c +++ b/drivers/acpi/acpica/hwgpe.c @@ -444,12 +444,19 @@ acpi_hw_enable_wakeup_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info, return (AE_OK); } +struct acpi_gpe_block_status_context { + struct acpi_gpe_register_info *gpe_skip_register_info; + u8 gpe_skip_mask; + u8 retval; +}; + /****************************************************************************** * * FUNCTION: acpi_hw_get_gpe_block_status * * PARAMETERS: gpe_xrupt_info - GPE Interrupt info * gpe_block - Gpe Block info + * context - GPE list walk context data * * RETURN: Success * @@ -460,12 +467,13 @@ acpi_hw_enable_wakeup_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info, static acpi_status acpi_hw_get_gpe_block_status(struct acpi_gpe_xrupt_info *gpe_xrupt_info, struct acpi_gpe_block_info *gpe_block, - void *ret_ptr) + void *context) { + struct acpi_gpe_block_status_context *c = context; struct acpi_gpe_register_info *gpe_register_info; u64 in_enable, in_status; acpi_status status; - u8 *ret = ret_ptr; + u8 ret_mask; u32 i; /* Examine each GPE Register within the block */ @@ -485,7 +493,11 @@ acpi_hw_get_gpe_block_status(struct acpi_gpe_xrupt_info *gpe_xrupt_info, continue; } - *ret |= in_enable & in_status; + ret_mask = in_enable & in_status; + if (ret_mask && c->gpe_skip_register_info == gpe_register_info) { + ret_mask &= ~c->gpe_skip_mask; + } + c->retval |= ret_mask; } return (AE_OK); @@ -561,24 +573,41 @@ acpi_status acpi_hw_enable_all_wakeup_gpes(void) * * FUNCTION: acpi_hw_check_all_gpes * - * PARAMETERS: None + * PARAMETERS: gpe_skip_device - GPE devoce of the GPE to skip + * gpe_skip_number - Number of the GPE to skip * * RETURN: Combined status of all GPEs * - * DESCRIPTION: Check all enabled GPEs in all GPE blocks and return TRUE if the + * DESCRIPTION: Check all enabled GPEs in all GPE blocks, except for the one + * represented by the "skip" arguments, and return TRUE if the * status bit is set for at least one of them of FALSE otherwise. * ******************************************************************************/ -u8 acpi_hw_check_all_gpes(void) +u8 acpi_hw_check_all_gpes(acpi_handle gpe_skip_device, u32 gpe_skip_number) { - u8 ret = 0; + struct acpi_gpe_block_status_context context = { + .gpe_skip_register_info = NULL, + .retval = 0, + }; + struct acpi_gpe_event_info *gpe_event_info; + acpi_cpu_flags flags; ACPI_FUNCTION_TRACE(acpi_hw_check_all_gpes); - (void)acpi_ev_walk_gpe_list(acpi_hw_get_gpe_block_status, &ret); + flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock); - return (ret != 0); + gpe_event_info = acpi_ev_get_gpe_event_info(gpe_skip_device, + gpe_skip_number); + if (gpe_event_info) { + context.gpe_skip_register_info = gpe_event_info->register_info; + context.gpe_skip_mask = acpi_hw_get_gpe_register_bit(gpe_event_info); + } + + acpi_os_release_lock(acpi_gbl_gpe_lock, flags); + + (void)acpi_ev_walk_gpe_list(acpi_hw_get_gpe_block_status, &context); + return (context.retval != 0); } #endif /* !ACPI_REDUCED_HARDWARE */ diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c index d1f1cf5d4bf0..9b9094b0b73f 100644 --- a/drivers/acpi/ec.c +++ b/drivers/acpi/ec.c @@ -2037,6 +2037,11 @@ void acpi_ec_set_gpe_wake_mask(u8 action) acpi_set_gpe_wake_mask(NULL, first_ec->gpe, action); } +bool acpi_ec_other_gpes_active(void) +{ + return acpi_any_gpe_status_set(first_ec ? first_ec->gpe : U32_MAX); +} + bool acpi_ec_dispatch_gpe(void) { u32 ret; diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h index 3616daec650b..d44c591c4ee4 100644 --- a/drivers/acpi/internal.h +++ b/drivers/acpi/internal.h @@ -202,6 +202,7 @@ void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit); #ifdef CONFIG_PM_SLEEP void acpi_ec_flush_work(void); +bool acpi_ec_other_gpes_active(void); bool acpi_ec_dispatch_gpe(void); #endif diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c index e5f95922bc21..bb1ae400ec1f 100644 --- a/drivers/acpi/sleep.c +++ b/drivers/acpi/sleep.c @@ -982,10 +982,7 @@ static int acpi_s2idle_prepare_late(void) static void acpi_s2idle_sync(void) { - /* - * The EC driver uses the system workqueue and an additional special - * one, so those need to be flushed too. - */ + /* The EC driver uses special workqueues that need to be flushed. */ acpi_ec_flush_work(); acpi_os_wait_events_complete(); /* synchronize Notify handling */ } @@ -1013,18 +1010,19 @@ static bool acpi_s2idle_wake(void) return true; /* - * If there are no EC events to process and at least one of the - * other enabled GPEs is active, the wakeup is regarded as a - * genuine one. - * - * Note that the checks below must be carried out in this order - * to avoid returning prematurely due to a change of the EC GPE - * status bit from unset to set between the checks with the - * status bits of all the other GPEs unset. + * If the status bit is set for any enabled GPE other than the + * EC one, the wakeup is regarded as a genuine one. */ - if (acpi_any_gpe_status_set() && !acpi_ec_dispatch_gpe()) + if (acpi_ec_other_gpes_active()) return true; + /* + * If the EC GPE status bit has not been set, the wakeup is + * regarded as a spurious one. + */ + if (!acpi_ec_dispatch_gpe()) + return false; + /* * Cancel the wakeup and process all pending events in case * there are any wakeup ones in there. diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index 959d6d5eb000..0a01df608849 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -2653,7 +2653,7 @@ static int genpd_iterate_idle_states(struct device_node *dn, ret = of_count_phandle_with_args(dn, "domain-idle-states", NULL); if (ret <= 0) - return ret; + return ret == -ENOENT ? 0 : ret; /* Loop over the phandles until all the requested entry is found */ of_for_each_phandle(&it, ret, dn, "domain-idle-states", NULL, 0) { diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c index 0e99a760aebd..6d1dee7051eb 100644 --- a/drivers/base/power/main.c +++ b/drivers/base/power/main.c @@ -40,6 +40,10 @@ typedef int (*pm_callback_t)(struct device *); +#define list_for_each_entry_rcu_locked(pos, head, member) \ + list_for_each_entry_rcu(pos, head, member, \ + device_links_read_lock_held()) + /* * The entries in the dpm_list list are in a depth first order, simply * because children are guaranteed to be discovered after parents, and @@ -266,7 +270,7 @@ static void dpm_wait_for_suppliers(struct device *dev, bool async) * callbacks freeing the link objects for the links in the list we're * walking. */ - list_for_each_entry_rcu(link, &dev->links.suppliers, c_node) + list_for_each_entry_rcu_locked(link, &dev->links.suppliers, c_node) if (READ_ONCE(link->status) != DL_STATE_DORMANT) dpm_wait(link->supplier, async); @@ -323,7 +327,7 @@ static void dpm_wait_for_consumers(struct device *dev, bool async) * continue instead of trying to continue in parallel with its * unregistration). */ - list_for_each_entry_rcu(link, &dev->links.consumers, s_node) + list_for_each_entry_rcu_locked(link, &dev->links.consumers, s_node) if (READ_ONCE(link->status) != DL_STATE_DORMANT) dpm_wait(link->consumer, async); @@ -1235,7 +1239,7 @@ static void dpm_superior_set_must_resume(struct device *dev) idx = device_links_read_lock(); - list_for_each_entry_rcu(link, &dev->links.suppliers, c_node) + list_for_each_entry_rcu_locked(link, &dev->links.suppliers, c_node) link->supplier->power.must_resume = true; device_links_read_unlock(idx); @@ -1695,7 +1699,7 @@ static void dpm_clear_superiors_direct_complete(struct device *dev) idx = device_links_read_lock(); - list_for_each_entry_rcu(link, &dev->links.suppliers, c_node) { + list_for_each_entry_rcu_locked(link, &dev->links.suppliers, c_node) { spin_lock_irq(&link->supplier->power.lock); link->supplier->power.direct_complete = false; spin_unlock_irq(&link->supplier->power.lock); diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c index 16134a69bf6f..99c7da112c95 100644 --- a/drivers/base/power/runtime.c +++ b/drivers/base/power/runtime.c @@ -1087,29 +1087,47 @@ int __pm_runtime_resume(struct device *dev, int rpmflags) EXPORT_SYMBOL_GPL(__pm_runtime_resume); /** - * pm_runtime_get_if_in_use - Conditionally bump up the device's usage counter. + * pm_runtime_get_if_active - Conditionally bump up the device's usage counter. * @dev: Device to handle. * * Return -EINVAL if runtime PM is disabled for the device. * - * If that's not the case and if the device's runtime PM status is RPM_ACTIVE - * and the runtime PM usage counter is nonzero, increment the counter and - * return 1. Otherwise return 0 without changing the counter. + * Otherwise, if the device's runtime PM status is RPM_ACTIVE and either + * ign_usage_count is true or the device's usage_count is non-zero, increment + * the counter and return 1. Otherwise return 0 without changing the counter. + * + * If ign_usage_count is true, the function can be used to prevent suspending + * the device when its runtime PM status is RPM_ACTIVE. + * + * If ign_usage_count is false, the function can be used to prevent suspending + * the device when both its runtime PM status is RPM_ACTIVE and its usage_count + * is non-zero. + * + * The caller is resposible for putting the device's usage count when ther + * return value is greater than zero. */ -int pm_runtime_get_if_in_use(struct device *dev) +int pm_runtime_get_if_active(struct device *dev, bool ign_usage_count) { unsigned long flags; int retval; spin_lock_irqsave(&dev->power.lock, flags); - retval = dev->power.disable_depth > 0 ? -EINVAL : - dev->power.runtime_status == RPM_ACTIVE - && atomic_inc_not_zero(&dev->power.usage_count); + if (dev->power.disable_depth > 0) { + retval = -EINVAL; + } else if (dev->power.runtime_status != RPM_ACTIVE) { + retval = 0; + } else if (ign_usage_count) { + retval = 1; + atomic_inc(&dev->power.usage_count); + } else { + retval = atomic_inc_not_zero(&dev->power.usage_count); + } trace_rpm_usage_rcuidle(dev, 0); spin_unlock_irqrestore(&dev->power.lock, flags); + return retval; } -EXPORT_SYMBOL_GPL(pm_runtime_get_if_in_use); +EXPORT_SYMBOL_GPL(pm_runtime_get_if_active); /** * __pm_runtime_set_status - Set runtime PM status of a device. diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c index 27f3e60608e5..92073ac68473 100644 --- a/drivers/base/power/wakeup.c +++ b/drivers/base/power/wakeup.c @@ -24,6 +24,9 @@ suspend_state_t pm_suspend_target_state; #define pm_suspend_target_state (PM_SUSPEND_ON) #endif +#define list_for_each_entry_rcu_locked(pos, head, member) \ + list_for_each_entry_rcu(pos, head, member, \ + srcu_read_lock_held(&wakeup_srcu)) /* * If set, the suspend/hibernate code will abort transitions to a sleep state * if wakeup events are registered during or immediately before the transition. @@ -241,7 +244,9 @@ void wakeup_source_unregister(struct wakeup_source *ws) { if (ws) { wakeup_source_remove(ws); - wakeup_source_sysfs_remove(ws); + if (ws->dev) + wakeup_source_sysfs_remove(ws); + wakeup_source_destroy(ws); } } @@ -405,7 +410,7 @@ void device_wakeup_arm_wake_irqs(void) int srcuidx; srcuidx = srcu_read_lock(&wakeup_srcu); - list_for_each_entry_rcu(ws, &wakeup_sources, entry) + list_for_each_entry_rcu_locked(ws, &wakeup_sources, entry) dev_pm_arm_wake_irq(ws->wakeirq); srcu_read_unlock(&wakeup_srcu, srcuidx); } @@ -421,7 +426,7 @@ void device_wakeup_disarm_wake_irqs(void) int srcuidx; srcuidx = srcu_read_lock(&wakeup_srcu); - list_for_each_entry_rcu(ws, &wakeup_sources, entry) + list_for_each_entry_rcu_locked(ws, &wakeup_sources, entry) dev_pm_disarm_wake_irq(ws->wakeirq); srcu_read_unlock(&wakeup_srcu, srcuidx); } @@ -874,7 +879,7 @@ void pm_print_active_wakeup_sources(void) struct wakeup_source *last_activity_ws = NULL; srcuidx = srcu_read_lock(&wakeup_srcu); - list_for_each_entry_rcu(ws, &wakeup_sources, entry) { + list_for_each_entry_rcu_locked(ws, &wakeup_sources, entry) { if (ws->active) { pm_pr_dbg("active wakeup source: %s\n", ws->name); active = 1; @@ -1025,7 +1030,7 @@ void pm_wakep_autosleep_enabled(bool set) int srcuidx; srcuidx = srcu_read_lock(&wakeup_srcu); - list_for_each_entry_rcu(ws, &wakeup_sources, entry) { + list_for_each_entry_rcu_locked(ws, &wakeup_sources, entry) { spin_lock_irq(&ws->lock); if (ws->autosleep_enabled != set) { ws->autosleep_enabled = set; @@ -1104,7 +1109,7 @@ static void *wakeup_sources_stats_seq_start(struct seq_file *m, } *srcuidx = srcu_read_lock(&wakeup_srcu); - list_for_each_entry_rcu(ws, &wakeup_sources, entry) { + list_for_each_entry_rcu_locked(ws, &wakeup_sources, entry) { if (n-- <= 0) return ws; } diff --git a/drivers/cpuidle/cpuidle-psci.c b/drivers/cpuidle/cpuidle-psci.c index edd7a54ef0d3..bae9140a65a5 100644 --- a/drivers/cpuidle/cpuidle-psci.c +++ b/drivers/cpuidle/cpuidle-psci.c @@ -160,6 +160,29 @@ int __init psci_dt_parse_state_node(struct device_node *np, u32 *state) return 0; } +static int __init psci_dt_cpu_init_topology(struct cpuidle_driver *drv, + struct psci_cpuidle_data *data, + unsigned int state_count, int cpu) +{ + /* Currently limit the hierarchical topology to be used in OSI mode. */ + if (!psci_has_osi_support()) + return 0; + + data->dev = psci_dt_attach_cpu(cpu); + if (IS_ERR_OR_NULL(data->dev)) + return PTR_ERR_OR_ZERO(data->dev); + + /* + * Using the deepest state for the CPU to trigger a potential selection + * of a shared state for the domain, assumes the domain states are all + * deeper states. + */ + drv->states[state_count - 1].enter = psci_enter_domain_idle_state; + psci_cpuidle_use_cpuhp = true; + + return 0; +} + static int __init psci_dt_cpu_init_idle(struct cpuidle_driver *drv, struct device_node *cpu_node, unsigned int state_count, int cpu) @@ -193,25 +216,10 @@ static int __init psci_dt_cpu_init_idle(struct cpuidle_driver *drv, goto free_mem; } - /* Currently limit the hierarchical topology to be used in OSI mode. */ - if (psci_has_osi_support()) { - data->dev = psci_dt_attach_cpu(cpu); - if (IS_ERR(data->dev)) { - ret = PTR_ERR(data->dev); - goto free_mem; - } - - /* - * Using the deepest state for the CPU to trigger a potential - * selection of a shared state for the domain, assumes the - * domain states are all deeper states. - */ - if (data->dev) { - drv->states[state_count - 1].enter = - psci_enter_domain_idle_state; - psci_cpuidle_use_cpuhp = true; - } - } + /* Initialize optional data, used for the hierarchical topology. */ + ret = psci_dt_cpu_init_topology(drv, data, state_count, cpu); + if (ret < 0) + goto free_mem; /* Idle states parsed correctly, store them in the per-cpu struct. */ data->psci_states = psci_states; diff --git a/include/acpi/acpixf.h b/include/acpi/acpixf.h index 8e8be989c2a6..a50d6dea44c3 100644 --- a/include/acpi/acpixf.h +++ b/include/acpi/acpixf.h @@ -752,7 +752,7 @@ ACPI_HW_DEPENDENT_RETURN_UINT32(u32 acpi_dispatch_gpe(acpi_handle gpe_device, u3 ACPI_HW_DEPENDENT_RETURN_STATUS(acpi_status acpi_disable_all_gpes(void)) ACPI_HW_DEPENDENT_RETURN_STATUS(acpi_status acpi_enable_all_runtime_gpes(void)) ACPI_HW_DEPENDENT_RETURN_STATUS(acpi_status acpi_enable_all_wakeup_gpes(void)) -ACPI_HW_DEPENDENT_RETURN_UINT32(u32 acpi_any_gpe_status_set(void)) +ACPI_HW_DEPENDENT_RETURN_UINT32(u32 acpi_any_gpe_status_set(u32 gpe_skip_number)) ACPI_HW_DEPENDENT_RETURN_UINT32(u32 acpi_any_fixed_event_status_set(void)) ACPI_HW_DEPENDENT_RETURN_STATUS(acpi_status diff --git a/include/linux/pm_runtime.h b/include/linux/pm_runtime.h index 22af69d237a6..3bdcbce8141a 100644 --- a/include/linux/pm_runtime.h +++ b/include/linux/pm_runtime.h @@ -38,7 +38,7 @@ extern int pm_runtime_force_resume(struct device *dev); extern int __pm_runtime_idle(struct device *dev, int rpmflags); extern int __pm_runtime_suspend(struct device *dev, int rpmflags); extern int __pm_runtime_resume(struct device *dev, int rpmflags); -extern int pm_runtime_get_if_in_use(struct device *dev); +extern int pm_runtime_get_if_active(struct device *dev, bool ign_usage_count); extern int pm_schedule_suspend(struct device *dev, unsigned int delay); extern int __pm_runtime_set_status(struct device *dev, unsigned int status); extern int pm_runtime_barrier(struct device *dev); @@ -60,6 +60,11 @@ extern void pm_runtime_put_suppliers(struct device *dev); extern void pm_runtime_new_link(struct device *dev); extern void pm_runtime_drop_link(struct device *dev); +static inline int pm_runtime_get_if_in_use(struct device *dev) +{ + return pm_runtime_get_if_active(dev, false); +} + static inline void pm_suspend_ignore_children(struct device *dev, bool enable) { dev->power.ignore_children = enable; @@ -143,6 +148,11 @@ static inline int pm_runtime_get_if_in_use(struct device *dev) { return -EINVAL; } +static inline int pm_runtime_get_if_active(struct device *dev, + bool ign_usage_count) +{ + return -EINVAL; +} static inline int __pm_runtime_set_status(struct device *dev, unsigned int status) { return 0; } static inline int pm_runtime_barrier(struct device *dev) { return 0; } diff --git a/kernel/power/user.c b/kernel/power/user.c index 77438954cc2b..58ed9478787f 100644 --- a/kernel/power/user.c +++ b/kernel/power/user.c @@ -409,21 +409,7 @@ snapshot_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) switch (cmd) { case SNAPSHOT_GET_IMAGE_SIZE: case SNAPSHOT_AVAIL_SWAP_SIZE: - case SNAPSHOT_ALLOC_SWAP_PAGE: { - compat_loff_t __user *uoffset = compat_ptr(arg); - loff_t offset; - mm_segment_t old_fs; - int err; - - old_fs = get_fs(); - set_fs(KERNEL_DS); - err = snapshot_ioctl(file, cmd, (unsigned long) &offset); - set_fs(old_fs); - if (!err && put_user(offset, uoffset)) - err = -EFAULT; - return err; - } - + case SNAPSHOT_ALLOC_SWAP_PAGE: case SNAPSHOT_CREATE_IMAGE: return snapshot_ioctl(file, cmd, (unsigned long) compat_ptr(arg));