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author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2020-08-06 14:15:47 +0300 |
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committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2020-08-06 14:15:47 +0300 |
commit | 94fb1afb14c4f0ceb8c5508ddddac6819f662e95 (patch) | |
tree | 4988e5769dc7482caa7f441475ae31f50bbd37ef /drivers/acpi/osl.c | |
parent | c4735d990268399da9133b0ad445e488ece009ad (diff) | |
parent | 47ec5303d73ea344e84f46660fff693c57641386 (diff) | |
download | linux-94fb1afb14c4f0ceb8c5508ddddac6819f662e95.tar.xz |
Mgerge remote-tracking branch 'torvalds/master' into perf/core
To sync headers, for instance, in this case tools/perf was ahead of
upstream till Linus merged tip/perf/core to get the
PERF_RECORD_TEXT_POKE changes:
Warning: Kernel ABI header at 'tools/include/uapi/linux/perf_event.h' differs from latest version at 'include/uapi/linux/perf_event.h'
diff -u tools/include/uapi/linux/perf_event.h include/uapi/linux/perf_event.h
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'drivers/acpi/osl.c')
-rw-r--r-- | drivers/acpi/osl.c | 63 |
1 files changed, 36 insertions, 27 deletions
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c index 762c5d50b8fe..6ad8cb05f672 100644 --- a/drivers/acpi/osl.c +++ b/drivers/acpi/osl.c @@ -77,7 +77,10 @@ struct acpi_ioremap { void __iomem *virt; acpi_physical_address phys; acpi_size size; - unsigned long refcount; + union { + unsigned long refcount; + struct rcu_work rwork; + } track; }; static LIST_HEAD(acpi_ioremaps); @@ -250,7 +253,7 @@ void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size) map = acpi_map_lookup(phys, size); if (map) { virt = map->virt + (phys - map->phys); - map->refcount++; + map->track.refcount++; } mutex_unlock(&acpi_ioremap_lock); return virt; @@ -335,7 +338,7 @@ void __iomem __ref /* Check if there's a suitable mapping already. */ map = acpi_map_lookup(phys, size); if (map) { - map->refcount++; + map->track.refcount++; goto out; } @@ -358,7 +361,7 @@ void __iomem __ref map->virt = virt; map->phys = pg_off; map->size = pg_sz; - map->refcount = 1; + map->track.refcount = 1; list_add_tail_rcu(&map->list, &acpi_ioremaps); @@ -374,21 +377,26 @@ void *__ref acpi_os_map_memory(acpi_physical_address phys, acpi_size size) } EXPORT_SYMBOL_GPL(acpi_os_map_memory); -/* Must be called with mutex_lock(&acpi_ioremap_lock) */ -static unsigned long acpi_os_drop_map_ref(struct acpi_ioremap *map) +static void acpi_os_map_remove(struct work_struct *work) { - unsigned long refcount = --map->refcount; + struct acpi_ioremap *map = container_of(to_rcu_work(work), + struct acpi_ioremap, + track.rwork); - if (!refcount) - list_del_rcu(&map->list); - return refcount; + acpi_unmap(map->phys, map->virt); + kfree(map); } -static void acpi_os_map_cleanup(struct acpi_ioremap *map) +/* Must be called with mutex_lock(&acpi_ioremap_lock) */ +static void acpi_os_drop_map_ref(struct acpi_ioremap *map) { - synchronize_rcu_expedited(); - acpi_unmap(map->phys, map->virt); - kfree(map); + if (--map->track.refcount) + return; + + list_del_rcu(&map->list); + + INIT_RCU_WORK(&map->track.rwork, acpi_os_map_remove); + queue_rcu_work(system_wq, &map->track.rwork); } /** @@ -397,8 +405,8 @@ static void acpi_os_map_cleanup(struct acpi_ioremap *map) * @size: Size of the address range to drop a reference to. * * Look up the given virtual address range in the list of existing ACPI memory - * mappings, drop a reference to it and unmap it if there are no more active - * references to it. + * mappings, drop a reference to it and if there are no more active references + * to it, queue it up for later removal. * * During early init (when acpi_permanent_mmap has not been set yet) this * routine simply calls __acpi_unmap_table() to get the job done. Since @@ -408,7 +416,6 @@ static void acpi_os_map_cleanup(struct acpi_ioremap *map) void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size) { struct acpi_ioremap *map; - unsigned long refcount; if (!acpi_permanent_mmap) { __acpi_unmap_table(virt, size); @@ -416,23 +423,27 @@ void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size) } mutex_lock(&acpi_ioremap_lock); + map = acpi_map_lookup_virt(virt, size); if (!map) { mutex_unlock(&acpi_ioremap_lock); WARN(true, PREFIX "%s: bad address %p\n", __func__, virt); return; } - refcount = acpi_os_drop_map_ref(map); - mutex_unlock(&acpi_ioremap_lock); + acpi_os_drop_map_ref(map); - if (!refcount) - acpi_os_map_cleanup(map); + mutex_unlock(&acpi_ioremap_lock); } EXPORT_SYMBOL_GPL(acpi_os_unmap_iomem); +/** + * acpi_os_unmap_memory - Drop a memory mapping reference. + * @virt: Start of the address range to drop a reference to. + * @size: Size of the address range to drop a reference to. + */ void __ref acpi_os_unmap_memory(void *virt, acpi_size size) { - return acpi_os_unmap_iomem((void __iomem *)virt, size); + acpi_os_unmap_iomem((void __iomem *)virt, size); } EXPORT_SYMBOL_GPL(acpi_os_unmap_memory); @@ -461,7 +472,6 @@ void acpi_os_unmap_generic_address(struct acpi_generic_address *gas) { u64 addr; struct acpi_ioremap *map; - unsigned long refcount; if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) return; @@ -472,16 +482,15 @@ void acpi_os_unmap_generic_address(struct acpi_generic_address *gas) return; mutex_lock(&acpi_ioremap_lock); + map = acpi_map_lookup(addr, gas->bit_width / 8); if (!map) { mutex_unlock(&acpi_ioremap_lock); return; } - refcount = acpi_os_drop_map_ref(map); - mutex_unlock(&acpi_ioremap_lock); + acpi_os_drop_map_ref(map); - if (!refcount) - acpi_os_map_cleanup(map); + mutex_unlock(&acpi_ioremap_lock); } EXPORT_SYMBOL(acpi_os_unmap_generic_address); |