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From: Qian Cai <quic_qiancai@quicinc.com>
To: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Yury Norov <yury.norov@gmail.com>,
	Rasmus Villemoes <linux@rasmusvillemoes.dk>,
	<linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] bitmap: simplify GENMASK(size - 1, 0) lines
Date: Tue, 26 Oct 2021 11:26:14 -0400	[thread overview]
Message-ID: <adcdf79d-e50c-2fb0-e105-67b384189999@quicinc.com> (raw)
In-Reply-To: <YXgafyMzK+o9FYkN@smile.fi.intel.com>



On 10/26/21 11:10 AM, Andy Shevchenko wrote:
> On Tue, Oct 26, 2021 at 10:41:08AM -0400, Qian Cai wrote:
>> Since "size" is an "unsigned int", the rvalue "size - 1" will still be
>> "unsigned int" according to the C standard (3.2.1.5 Usual arithmetic
>> conversions). Therefore, GENMASK(size - 1, 0) will always return 0UL.
> 
> Huh?!
> 
> Have you run test_bitmap et al., btw?

Not yet. I'll setup a VM to run it soon.

  reply	other threads:[~2021-10-26 15:26 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-26 14:41 [PATCH] bitmap: simplify GENMASK(size - 1, 0) lines Qian Cai
2021-10-26 15:10 ` Andy Shevchenko
2021-10-26 15:26   ` Qian Cai [this message]
2021-10-26 18:54 ` Yury Norov
2021-10-26 19:21   ` Andy Shevchenko
2021-10-26 19:28     ` Yury Norov
2021-10-26 19:42       ` Andy Shevchenko
2021-10-26 19:54         ` Qian Cai
2021-10-27  9:44           ` Andy Shevchenko
2021-10-27 15:06             ` Qian Cai
2021-10-26 19:33     ` Qian Cai
2021-10-27  9:34       ` Andy Shevchenko
2021-10-29  1:36 ` [bitmap] ca95e676a1: BUG:unable_to_handle_page_fault_for_address kernel test robot
2021-10-29  1:36   ` kernel test robot

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