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From: Roger Willcocks <roger@filmlight.ltd.uk>
To: Steven Rostedt <rostedt@goodmis.org>,
	Linus Torvalds <torvalds@linux-foundation.org>
Cc: roger@filmlight.ltd.uk, LKML <linux-kernel@vger.kernel.org>,
	Ben Skeggs <bskeggs@redhat.com>, David Airlie <airlied@linux.ie>,
	Daniel Vetter <daniel@ffwll.ch>,
	Leon Romanovsky <leon@kernel.org>,
	Doug Ledford <dledford@redhat.com>,
	Jason Gunthorpe <jgg@ziepe.ca>,
	"Darrick J. Wong" <darrick.wong@oracle.com>,
	linux-xfs@vger.kernel.org,
	dri-devel <dri-devel@lists.freedesktop.org>,
	nouveau@lists.freedesktop.org,
	linux-rdma <linux-rdma@vger.kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [RFC][PATCH] kernel.h: Add generic roundup_64() macro
Date: Fri, 24 May 2019 16:11:14 +0100	[thread overview]
Message-ID: <e4e875f0-2aa5-89f4-f462-78bedb9c5cde@filmlight.ltd.uk> (raw)
In-Reply-To: <20190523112740.7167aba4@gandalf.local.home>


On 23/05/2019 16:27, Steven Rostedt wrote:
>
> I haven't yet tested this, but what about something like the following:
>
> ...perhaps forget about the constant check, and just force
> the power of two check:
>
> 							\
> 	if (!(__y & (__y >> 1))) {			\
> 		__x = round_up(x, y);			\
> 	} else {					\

You probably want

            if (!(__y & (__y - 1))

--

Roger

  parent reply	other threads:[~2019-05-24 15:11 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-23 14:00 Steven Rostedt
2019-05-23 14:00 ` Steven Rostedt
2019-05-23 15:10 ` Linus Torvalds
2019-05-23 15:27   ` Steven Rostedt
     [not found]     ` <20190523112740.7167aba4-f9ZlEuEWxVcJvu8Pb33WZ0EMvNT87kid@public.gmane.org>
2019-05-23 16:51       ` Linus Torvalds
2019-05-23 16:51         ` Linus Torvalds
2019-05-23 17:36         ` Steven Rostedt
2019-05-23 21:19           ` Linus Torvalds
2019-05-24 15:11     ` Roger Willcocks [this message]
2019-05-24 15:26       ` Steven Rostedt
2019-05-24 16:30         ` Nikolay Borisov
     [not found]           ` <bd4a85fc-dc56-aae0-4986-003ad4a11ef4-IBi9RG/b67k@public.gmane.org>
2019-05-24 16:36             ` Steven Rostedt
2019-05-24 16:36               ` Steven Rostedt

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