linux-kernel - [PATCH 1/1] ocfs2: eliminate a misreported warning

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Date:   Wed, 25 Apr 2018 19:29:59 +0800
From:   Zhen Lei <thunder.leizhen@...wei.com>
To:     Mark Fasheh <mark@...heh.com>, Joel Becker <jlbec@...lplan.org>,
        ocfs2-devel <ocfs2-devel@....oracle.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
CC:     Hanjun Guo <guohanjun@...wei.com>, Libin <huawei.libin@...wei.com>,
        "Kefeng Wang" <wangkefeng.wang@...wei.com>,
        Zhen Lei <thunder.leizhen@...wei.com>
Subject: [PATCH 1/1] ocfs2: eliminate a misreported warning

Below warning can not be happened, because the parameter chunksize passed
from ocfs2_info_freefrag_scan_chain-->ocfs2_info_update_ffg is guaranteed
to be positive. So __ilog2_u32 is impossible return -1.

fs/ocfs2/ioctl.c: In function 'ocfs2_info_update_ffg':
fs/ocfs2/ioctl.c:411:17: warning: array subscript is below array bounds [-Warray-bounds]
  hist->fc_chunks[index]++;
                 ^
fs/ocfs2/ioctl.c:411:17: warning: array subscript is below array bounds [-Warray-bounds]

Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
---
 fs/ocfs2/ioctl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ocfs2/ioctl.c b/fs/ocfs2/ioctl.c
index ab30c005..994726a 100644
--- a/fs/ocfs2/ioctl.c
+++ b/fs/ocfs2/ioctl.c
@@ -402,7 +402,7 @@ static int ocfs2_info_handle_freeinode(struct inode *inode,
 static void o2ffg_update_histogram(struct ocfs2_info_free_chunk_list *hist,
 				   unsigned int chunksize)
 {
-	int index;
+	u32 index;

 	index = __ilog2_u32(chunksize);
 	if (index >= OCFS2_INFO_MAX_HIST)
--
1.8.3