[PATCH] zswap: comment clarifying maxlen

From: Dan Streetman <ddstreet@ieee.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Seth Jennings <sjennings@variantweb.net>,
	Linux-MM <linux-mm@kvack.org>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	Dan Streetman <ddstreet@ieee.org>
Subject: [PATCH] zswap: comment clarifying maxlen
Date: Thu,  6 Aug 2015 13:54:49 -0400	[thread overview]
Message-ID: <1438883689-7868-1-git-send-email-ddstreet@ieee.org> (raw)
In-Reply-To: <CALZtONCquXbE-dHWQUfKL_OSO7Bk5HN+t2EZduoD11vcaiJxmQ@mail.gmail.com>

Add a comment clarifying the variable-size array created on the stack will
always be either CRYPTO_MAX_ALG_NAME (64) or 32 bytes long.

Signed-off-by: Dan Streetman <ddstreet@ieee.org>
---
 mm/zswap.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/mm/zswap.c b/mm/zswap.c
index 7bbecd9..b198081 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -691,6 +691,11 @@ static int __zswap_param_set(const char *val, const struct kernel_param *kp,
 	char str[kp->str->maxlen], *s;
 	int ret;
 
+	/*
+	 * kp is either zswap_zpool_kparam or zswap_compressor_kparam, defined
+	 * at the top of this file, so maxlen is CRYPTO_MAX_ALG_NAME (64) or
+	 * 32 (arbitrary).
+	 */
 	strlcpy(str, val, kp->str->maxlen);
 	s = strim(str);
 
-- 
2.1.0

