From: David Howells <dhowells@redhat.com>
To: Brian Norris <computersforpeace@gmail.com>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>,
dhowells@redhat.com, Paul Mackerras <paulus@samba.org>,
Andrew Morton <akpm@linux-foundation.org>,
linuxppc-dev@lists.ozlabs.org
Subject: Re: roundup_pow_of_two() may not handle 64-bit integers
Date: Thu, 15 May 2014 16:03:09 +0100 [thread overview]
Message-ID: <29314.1400166189@warthog.procyon.org.uk> (raw)
In-Reply-To: <20140515022238.GL28907@ld-irv-0074>
Brian Norris <computersforpeace@gmail.com> wrote:
> I'm looking to use roundup_pow_of_two() (actually, order_base_2())
> from <linux/log2.h>, but it seems that it only supports 64-bit integers
> if your toolchain uses a 64-bit 'unsigned long' type. This is strange,
> considering that ilog2() is explicitly designed for 32-bit or 64-bit
> compatibility.
ilog2() was explicitly designed for use with 'unsigned long'. See the commit
description (f0d1b0b30d250a07627ad8b9fbbb5c7cc08422e8). It may work with
unsigned long long, however...
David
next prev parent reply other threads:[~2014-05-15 15:03 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-15 2:22 roundup_pow_of_two() may not handle 64-bit integers Brian Norris
2014-05-15 15:03 ` David Howells [this message]
2014-05-15 19:44 ` Brian Norris
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