linux-kernel - [PATCH] staging: lustre/lnet: Fix wrong type casting warning generated by sparse

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Date:	Sat, 13 Feb 2016 23:34:35 +0530
From:	Niranjan Dighe <niranjan.dighe@...il.com>
To:	Oleg Drokin <oleg.drokin@...el.com>,
	Andreas Dilger <andreas.dilger@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Shivani Bhardwaj <shivanib134@...il.com>,
	Dmitry Eremin <dmitry.eremin@...el.com>,
	Mike Rapoport <mike.rapoport@...il.com>,
	Shraddha Barke <shraddha.6596@...il.com>,
	Frank Zago <fzago@...y.com>,
	Hatice ERTÜRK <haticeerturk27@...il.com>,
	Mike Shuey <shuey@...due.edu>
Cc:	lustre-devel@...ts.lustre.org, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] staging: lustre/lnet: Fix wrong type casting warning
 generated by sparse

Fixed the following warning reported by sparse about typecasting. A
userspace pointer was being typecasted by simply (char *) which causes
sparse to give the following warning -

warning: cast removes address space of expression

Fixed it by adding __user annotation to the typecasting.

Signed-off-by: Niranjan Dighe <niranjan.dighe@...il.com>
---
 drivers/staging/lustre/lnet/selftest/console.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/lustre/lnet/selftest/console.c b/drivers/staging/lustre/lnet/selftest/console.c
index 366211e..64b6a70 100644
--- a/drivers/staging/lustre/lnet/selftest/console.c
+++ b/drivers/staging/lustre/lnet/selftest/console.c
@@ -1461,9 +1461,9 @@ lstcon_statrpc_readent(int transop, srpc_msg_t *msg,
 
 	sfwk_stat = (sfw_counters_t __user *)&ent_up->rpe_payload[0];
 	srpc_stat = (srpc_counters_t __user *)
-				      ((char *)sfwk_stat + sizeof(*sfwk_stat));
+				((char __user *)sfwk_stat + sizeof(*sfwk_stat));
 	lnet_stat = (lnet_counters_t __user *)
-				      ((char *)srpc_stat + sizeof(*srpc_stat));
+				((char __user *)srpc_stat + sizeof(*srpc_stat));
 
 	if (copy_to_user(sfwk_stat, &rep->str_fw, sizeof(*sfwk_stat)) ||
 	    copy_to_user(srpc_stat, &rep->str_rpc, sizeof(*srpc_stat)) ||
-- 
1.9.1