From: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
To: Chas Williams <3chas3@gmail.com>
Cc: linux-atm-general@lists.sourceforge.net, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org,
"Gustavo A. R. Silva" <garsilva@embeddedor.com>
Subject: [PATCH] atm: he: use 64-bit arithmetic instead of 32-bit
Date: Wed, 7 Feb 2018 10:17:29 -0600 [thread overview]
Message-ID: <20180207161729.GA10329@embeddedgus> (raw)
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@embeddedor.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
next reply other threads:[~2018-02-07 16:17 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-07 16:17 Gustavo A. R. Silva [this message]
2018-02-08 20:05 ` [PATCH] atm: he: use 64-bit arithmetic instead of 32-bit David Miller
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20180207161729.GA10329@embeddedgus \
--to=gustavo@embeddedor.com \
--cc=3chas3@gmail.com \
--cc=garsilva@embeddedor.com \
--cc=linux-atm-general@lists.sourceforge.net \
--cc=linux-kernel@vger.kernel.org \
--cc=netdev@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).