linux-kernel - [PATCH] cachefiles: remove always false 'datalen

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Message-ID: <20210824031847.GA23326@raspberrypi>
Date:   Tue, 24 Aug 2021 04:18:47 +0100
From:   Austin Kim <austindh.kim@...il.com>
To:     dhowells@...hat.com
Cc:     linux-cachefs@...hat.com, linux-kernel@...r.kernel.org,
        austin.kim@....com
Subject: [PATCH] cachefiles: remove always false 'datalen < 0' expression

From: Austin Kim <austin.kim@....com>

Since 'datalen' is declared as size_t, the 'datalen < 0' expression
is always false. Where size_t is defined as below;

   typedef unsigned long __kernel_ulong_t;
   typedef __kernel_ulong_t __kernel_size_t;
   typedef __kernel_size_t size_t;

So it had better remove unnecessary 'always false' expression.

Signed-off-by: Austin Kim <austin.kim@....com>
---
 fs/cachefiles/daemon.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/cachefiles/daemon.c b/fs/cachefiles/daemon.c
index 752c1e43416f..1cfed9e0812a 100644
--- a/fs/cachefiles/daemon.c
+++ b/fs/cachefiles/daemon.c
@@ -225,7 +225,7 @@ static ssize_t cachefiles_daemon_write(struct file *file,
 	if (test_bit(CACHEFILES_DEAD, &cache->flags))
 		return -EIO;
 
-	if (datalen < 0 || datalen > PAGE_SIZE - 1)
+	if (datalen > PAGE_SIZE - 1)
 		return -EOPNOTSUPP;
 
 	/* drag the command string into the kernel so we can parse it */
-- 
2.20.1