[PATCH v1 3/5] drivers/base/memory: store mapping between MMOP_* and string in an array
From: David Hildenbrand <hidden>
Date: 2020-03-11 12:30:57
Also in:
linux-hyperv, linux-mm, lkml
Subsystem:
driver core, kobjects, debugfs and sysfs, memory hot(un)plug, the rest · Maintainers:
Greg Kroah-Hartman, "Rafael J. Wysocki", Danilo Krummrich, David Hildenbrand, Oscar Salvador, Linus Torvalds
Let's use a simple array which we can reuse soon. While at it, move the string->mmop conversion out of the device hotplug lock. Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Michal Hocko <mhocko@kernel.org> Cc: Oscar Salvador <osalvador@suse.de> Cc: "Rafael J. Wysocki" <rafael@kernel.org> Cc: Baoquan He <bhe@redhat.com> Cc: Wei Yang <redacted> Signed-off-by: David Hildenbrand <redacted> --- drivers/base/memory.c | 38 +++++++++++++++++++++++--------------- 1 file changed, 23 insertions(+), 15 deletions(-)
diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index e7e77cafef80..8a7f29c0bf97 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c@@ -28,6 +28,24 @@ #define MEMORY_CLASS_NAME "memory" +static const char *const online_type_to_str[] = { + [MMOP_OFFLINE] = "offline", + [MMOP_ONLINE] = "online", + [MMOP_ONLINE_KERNEL] = "online_kernel", + [MMOP_ONLINE_MOVABLE] = "online_movable", +}; + +static int memhp_online_type_from_str(const char *str) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(online_type_to_str); i++) { + if (sysfs_streq(str, online_type_to_str[i])) + return i; + } + return -EINVAL; +} + #define to_memory_block(dev) container_of(dev, struct memory_block, dev) static int sections_per_block;
@@ -236,26 +254,17 @@ static int memory_subsys_offline(struct device *dev) static ssize_t state_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { + const int online_type = memhp_online_type_from_str(buf); struct memory_block *mem = to_memory_block(dev); - int ret, online_type; + int ret; + + if (online_type < 0) + return -EINVAL; ret = lock_device_hotplug_sysfs(); if (ret) return ret; - if (sysfs_streq(buf, "online_kernel")) - online_type = MMOP_ONLINE_KERNEL; - else if (sysfs_streq(buf, "online_movable")) - online_type = MMOP_ONLINE_MOVABLE; - else if (sysfs_streq(buf, "online")) - online_type = MMOP_ONLINE; - else if (sysfs_streq(buf, "offline")) - online_type = MMOP_OFFLINE; - else { - ret = -EINVAL; - goto err; - } - switch (online_type) { case MMOP_ONLINE_KERNEL: case MMOP_ONLINE_MOVABLE:
@@ -271,7 +280,6 @@ static ssize_t state_store(struct device *dev, struct device_attribute *attr, ret = -EINVAL; /* should never happen */ } -err: unlock_device_hotplug(); if (ret < 0)
--
2.24.1