From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: David Laight <David.Laight@aculab.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Steven Rostedt <rostedt@goodmis.org>,
'Joe Perches' <joe@perches.com>,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH 0/1] Slightly relax the type checking done by min() and max().
Date: Fri, 25 Nov 2022 17:20:32 +0200 [thread overview]
Message-ID: <Y4DdQIMiFGk7YYcJ@smile.fi.intel.com> (raw)
In-Reply-To: <cfc6c0f0fd4c4724890be8a8397c2cbe@AcuMS.aculab.com>
On Fri, Nov 25, 2022 at 03:00:40PM +0000, David Laight wrote:
> The min() and max() defines include a type check to avoid the unexpected
> behaviour when a negative value is compared against and unsigned value.
> However a lot of code hits this check and uses min_t() to avoid the error.
> Many of these are just plain wrong.
>
> Those casting to u8 or u16 are particularly suspect, eg:
> drivers/usb/misc/usb251xb.c:528:
> hub->max_current_sp = min_t(u8, property_u32 / 2000, 50);
I don't buy this. What's exactly wrong with this code?
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2022-11-25 15:20 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-25 15:00 David Laight
2022-11-25 15:17 ` Andy Shevchenko
2022-11-25 15:22 ` David Laight
2022-11-25 15:20 ` Andy Shevchenko [this message]
2022-11-25 15:27 ` David Laight
2022-11-25 15:58 ` 'Andy Shevchenko'
2022-11-25 16:14 ` David Laight
2022-11-25 17:48 ` 'Andy Shevchenko'
2022-11-25 19:47 ` David Laight
2022-11-26 0:02 ` Andrew Morton
2022-11-26 10:21 ` David Laight
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