linux-kernel - RE: [PATCH] USB: gadget: dummy

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Message-ID: <8ca8b04cf5ef4e0099a04637df8293ac@AcuMS.aculab.com>
Date:   Fri, 21 Oct 2022 22:02:35 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Linus Torvalds' <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Felipe Balbi <balbi@...nel.org>,
        Jakob Koschel <jakobkoschel@...il.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Ira Weiny <ira.weiny@...el.com>
Subject: RE: [PATCH] USB: gadget: dummy_hcd: switch char * to u8 *

From: Linus Torvalds
> Sent: 21 October 2022 18:31
...
> I think you might as well also remove the cast that was always a bit odd:
> 
>                 buf[0] = (u8)dum->devstatus;
...
> I suspect a comment would be more readable than an odd cast that
> doesn't actually change anything (since the assignment does it
> anyway).

I've seen a compiler generate an '& 0xff' for the cast before
storing the low byte.
Don't even think about what that compiler would generated for:
		buf[0] = (u8)(dum->devstatus & 0xff);

The code is much easier to read as just an assignment :-)

	David

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