linux-kernel - [PATCH] epoll: simplify ep

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Date:   Wed, 26 Jul 2023 11:21:35 +0800
From:   thunder.leizhen@...weicloud.com
To:     Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Zhen Lei <thunder.leizhen@...wei.com>
Subject: [PATCH] epoll: simplify ep_alloc()

From: Zhen Lei <thunder.leizhen@...wei.com>

The get_current_user() does not fail, and moving it after kzalloc() can
simplify the code a bit.

Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
---
 fs/eventpoll.c | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index 4b1b3362f697b11..1d9a71a0c4c1678 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -975,15 +975,11 @@ void eventpoll_release_file(struct file *file)
 
 static int ep_alloc(struct eventpoll **pep)
 {
-	int error;
-	struct user_struct *user;
 	struct eventpoll *ep;
 
-	user = get_current_user();
-	error = -ENOMEM;
 	ep = kzalloc(sizeof(*ep), GFP_KERNEL);
 	if (unlikely(!ep))
-		goto free_uid;
+		return -ENOMEM;
 
 	mutex_init(&ep->mtx);
 	rwlock_init(&ep->lock);
@@ -992,16 +988,12 @@ static int ep_alloc(struct eventpoll **pep)
 	INIT_LIST_HEAD(&ep->rdllist);
 	ep->rbr = RB_ROOT_CACHED;
 	ep->ovflist = EP_UNACTIVE_PTR;
-	ep->user = user;
+	ep->user = get_current_user();
 	refcount_set(&ep->refcount, 1);
 
 	*pep = ep;
 
 	return 0;
-
-free_uid:
-	free_uid(user);
-	return error;
 }
 
 /*
-- 
2.25.1