From: Jason Gunthorpe <jgg-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
To: Bart Van Assche <Bart.VanAssche-Sjgp3cTcYWE@public.gmane.org>
Cc: "parav-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org"
<parav-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>,
"linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: [PATCH rdma-core] mlx4: Fix 1<<31 expressions
Date: Fri, 9 Feb 2018 09:24:53 -0700 [thread overview]
Message-ID: <20180209162453.GD7584@mellanox.com> (raw)
In-Reply-To: <1518193161.2871.14.camel-Sjgp3cTcYWE@public.gmane.org>
On Fri, Feb 09, 2018 at 04:19:23PM +0000, Bart Van Assche wrote:
> On Fri, 2018-02-09 at 16:12 +0000, Parav Pandit wrote:
> > Any reason to use open code instead of using BIT() macro from
> > include/linux/bitops.h which does the same thing?
>
> Personally I'm in favor of removing the BIT() macro from the kernel. That macro
> is not useful and only adds confusion. Code that does not use that macro is
> easier to read because one does not have to look up whether the BIT() macro
> is defined as 1U << x, 1UL << x or 1ULL << x.
Really? The rule is pretty simple:
BIT(x) for x < 32
BIT_ULL(x) for x >= 32 && x < 64
Why do you care about what specific type the macro produces?
Jason
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next prev parent reply other threads:[~2018-02-09 16:24 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-08 23:38 [PATCH rdma-core] mlx4: Fix 1<<31 expressions Jason Gunthorpe
[not found] ` <20180208233829.GA16128-uk2M96/98Pc@public.gmane.org>
2018-02-09 16:01 ` Bart Van Assche
[not found] ` <1518192109.2871.5.camel-Sjgp3cTcYWE@public.gmane.org>
2018-02-09 16:10 ` Jason Gunthorpe
[not found] ` <20180209161030.GA7584-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2018-02-09 16:12 ` Parav Pandit
[not found] ` <HE1PR0502MB3004BB45FC9ADB9B49CAF283D1F20-692Kmc8YnlL9PhveBwpv4cDSnupUy6xnnBOFsp37pqbUKgpGm//BTAC/G2K4zDHf@public.gmane.org>
2018-02-09 16:13 ` Jason Gunthorpe
[not found] ` <20180209161325.GD7570-uk2M96/98Pc@public.gmane.org>
2018-02-09 16:20 ` Parav Pandit
2018-02-09 16:42 ` Leon Romanovsky
[not found] ` <20180209164200.GO2197-U/DQcQFIOTAAJjI8aNfphQ@public.gmane.org>
2018-02-09 16:51 ` Jason Gunthorpe
[not found] ` <20180209165138.GA11850-uk2M96/98Pc@public.gmane.org>
2018-02-09 16:55 ` Leon Romanovsky
2018-02-09 16:19 ` Bart Van Assche
[not found] ` <1518193161.2871.14.camel-Sjgp3cTcYWE@public.gmane.org>
2018-02-09 16:24 ` Jason Gunthorpe [this message]
[not found] ` <20180209162453.GD7584-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2018-02-09 17:18 ` Bart Van Assche
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