linux-kernel - [PATCH] atm: he: use 64-bit arithmetic instead of 32-bit

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Message-ID: <20180207161729.GA10329@embeddedgus>
Date:   Wed, 7 Feb 2018 10:17:29 -0600
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Chas Williams <3chas3@...il.com>
Cc:     linux-atm-general@...ts.sourceforge.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <garsilva@...eddedor.com>
Subject: [PATCH] atm: he: use 64-bit arithmetic instead of 32-bit

Add suffix ULL to constants 272, 204, 136 and 68 in order to give the
compiler complete information about the proper arithmetic to use.
Notice that these constants are used in contexts that expect
expressions of type unsigned long long (64 bits, unsigned).

The following expressions are currently being evaluated using 32-bit
arithmetic:

272 * mult
204 * mult
136 * mult
68 * mult

Addresses-Coverity-ID: 201058
Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
---
 drivers/atm/he.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/atm/he.c b/drivers/atm/he.c
index e58538c..29f102d 100644
--- a/drivers/atm/he.c
+++ b/drivers/atm/he.c
@@ -738,13 +738,13 @@ static int he_init_cs_block_rcm(struct he_dev *he_dev)
 #else
 		/* this is pretty, but avoids _divdu3 and is mostly correct */
 		mult = he_dev->atm_dev->link_rate / ATM_OC3_PCR;
-		if (rate_cps > (272 * mult))
+		if (rate_cps > (272ULL * mult))
 			buf = 4;
-		else if (rate_cps > (204 * mult))
+		else if (rate_cps > (204ULL * mult))
 			buf = 3;
-		else if (rate_cps > (136 * mult))
+		else if (rate_cps > (136ULL * mult))
 			buf = 2;
-		else if (rate_cps > (68 * mult))
+		else if (rate_cps > (68ULL * mult))
 			buf = 1;
 		else
 			buf = 0;
-- 
2.7.4