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Date:   Wed, 11 Mar 2020 14:27:40 +0000
From:   Wei Yang <richard.weiyang@gmail.com>
To:     Wei Yang <richard.weiyang@gmail.com>
Cc:     David Hildenbrand <david@redhat.com>, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org,
        linux-hyperv@vger.kernel.org,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Michal Hocko <mhocko@kernel.org>,
        Oscar Salvador <osalvador@suse.de>,
        "Rafael J. Wysocki" <rafael@kernel.org>,
        Baoquan He <bhe@redhat.com>
Subject: Re: [PATCH v1 3/5] drivers/base/memory: store mapping between MMOP_*
 and string in an array
Message-ID: <20200311142740.qh5it3lfaoyqzr6i@master>
Reply-To: Wei Yang <richard.weiyang@gmail.com>
References: <20200311123026.16071-1-david@redhat.com>
 <20200311123026.16071-4-david@redhat.com>
 <20200311142002.2htiv4llyam2svta@master>
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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