linux-kernel - [PATCH] mm/shmem: Fix input and output inconsistencies

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Date: Fri, 28 Jun 2024 11:23:27 +0800
From: "Bang Li" <libang.li@...group.com>
To: hughd@...gle.com,
	akpm@...ux-foundation.org
Cc:  <baolin.wang@...ux.alibaba.com>,
   <david@...hat.com>,
   <ryan.roberts@....com>,
   <linux-mm@...ck.org>,
   <linux-kernel@...r.kernel.org>,
  "Bang Li" <libang.li@...group.com>
Subject: [PATCH] mm/shmem: Fix input and output inconsistencies

After the commit 19eaf44954df ("mm: thp: support allocation of
anonymous multi-size THP"), add mTHP support for anonymous shmem.
We can configure different policies through the multi-size THP
sysfs interface for anonymous shmem.

But when we configure the "advise" policy of
/sys/kernel/mm/transparent_hugepage/hugepages-xxxkB/shmem_enabled,
we cannot write the "advise", but write the "madvise", which is
unreasonable. We should keep the output and input values consistent,
which is more convenient for users.

Fixes: 61a57f1b1da9 ("mm: shmem: add multi-size THP sysfs interface for anonymous shmem")
Signed-off-by: Bang Li <libang.li@...group.com>
---
 mm/shmem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/shmem.c b/mm/shmem.c
index 13d139abe69a..d495c0701a83 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -4983,7 +4983,7 @@ static ssize_t thpsize_shmem_enabled_store(struct kobject *kobj,
 		clear_bit(order, &huge_shmem_orders_madvise);
 		set_bit(order, &huge_shmem_orders_within_size);
 		spin_unlock(&huge_shmem_orders_lock);
-	} else if (sysfs_streq(buf, "madvise")) {
+	} else if (sysfs_streq(buf, "advise")) {
 		spin_lock(&huge_shmem_orders_lock);
 		clear_bit(order, &huge_shmem_orders_always);
 		clear_bit(order, &huge_shmem_orders_inherit);
-- 
2.19.1.6.gb485710b