From: "Chen, Kenneth W" <kenneth.w.chen@intel.com>
To: "'Roland Dreier'" <rdreier@cisco.com>, <hawkes@sgi.com>
Cc: "Andrew Morton" <akpm@osdl.org>, <linux-kernel@vger.kernel.org>,
"Jack Steiner" <steiner@sgi.com>, "Jes Sorensen" <jes@sgi.com>
Subject: RE: [PATCH] fix alloc_large_system_hash roundup
Date: Wed, 15 Mar 2006 10:29:00 -0800 [thread overview]
Message-ID: <200603151828.k2FISxg19755@unix-os.sc.intel.com> (raw)
In-Reply-To: <adazmjr38t7.fsf@cisco.com>
Roland Dreier wrote on Wednesday, March 15, 2006 9:41 AM
> > /* rounded up to nearest power of 2 in size */
> > - numentries = 1UL << (long_log2(numentries) + 1);
> > + numentries = 1UL << (long_log2(2*numentries - 1));
>
> How about just using roundup_pow_of_two()? You could kill the comment
> too then.
roundup_pow_of_two uses fls, but fls takes an "int" argument. I think
that function is buggy on 64-bit arch. Is it an oversight or something?
static inline unsigned long roundup_pow_of_two(unsigned long x)
{
return (1UL << fls(x - 1));
}
- Ken
next prev parent reply other threads:[~2006-03-15 18:29 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-15 17:36 hawkes
2006-03-15 17:40 ` Roland Dreier
2006-03-15 18:29 ` Chen, Kenneth W [this message]
2006-03-15 18:41 ` Roland Dreier
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