Re: [PATCH v1 3/5] drivers/base/memory: store mapping between MMOP_* and string in an array

Wei Yang
2020-03-11T14:29:13Z

On Wed, Mar 11, 2020 at 02:20:02PM +0000, Wei Yang wrote:
>On Wed, Mar 11, 2020 at 01:30:24PM +0100, David Hildenbrand wrote:
>>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 <richard.weiyang@gmail.com>
>>Signed-off-by: David Hildenbrand <david@redhat.com>

Ok, I got the reason.

Reviewed-by: Wei Yang <richard.weiyang@gmail.com>

>>---
>> 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);
>
>In your following patch, you did the same conversion. Is it possible to merge
>them into this one?
>
>> 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
>
>--
>Wei Yang
>Help you, Help me

--
Wei Yang
Help you, Help me