linux-kernel - Re: [tip:x86/asm] bitops: Optimise get

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Date:	Thu, 01 Mar 2012 13:02:47 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Stephen Rothwell <sfr@...b.auug.org.au>
CC:	Paul Gortmaker <paul.gortmaker@...driver.com>, mingo@...hat.com,
	linux-kernel@...r.kernel.org, arnd@...db.de, dhowells@...hat.com,
	tglx@...utronix.de, linux-tip-commits@...r.kernel.org,
	linux-next@...r.kernel.org
Subject: Re: [tip:x86/asm] bitops: Optimise get_order()

David, could you make a fix for this?

	-hpa

On 02/29/2012 04:31 PM, Stephen Rothwell wrote:
> On Wed, 29 Feb 2012 15:29:04 -0500 Paul Gortmaker<paul.gortmaker@...driver.com>  wrote:
>>
>> On Mon, Feb 20, 2012 at 6:20 PM, tip-bot for David Howells
>> <dhowells@...hat.com>  wrote:
>>> Commit-ID:  d66acc39c7cee323733c8503b9de1821a56dff7e
>>> Gitweb:     http://git.kernel.org/tip/d66acc39c7cee323733c8503b9de1821a56dff7e
>>> Author:     David Howells<dhowells@...hat.com>
>>> AuthorDate: Mon, 20 Feb 2012 22:39:29 +0000
>>> Committer:  H. Peter Anvin<hpa@...or.com>
>>> CommitDate: Mon, 20 Feb 2012 14:47:02 -0800
>>>
>>> bitops: Optimise get_order()
>>
>> This is causing build failures on non-x86 in linux next according to git bisect.
>
> Presumably it needs to include linux/bitops.h (and see below).
>
>>> +static inline __attribute_const__
>>> +int __get_order(unsigned long size)
>>> +{
>>> +       int order;
>>> +
>>> +       size--;
>>> +       size>>= PAGE_SHIFT;
>>> +#if BITS_PER_LONG == 32
>>> +       order = fls(size);
>>> +#else
>>> +       order = fls64(size);
>>> +#endif
>
> linux/bitops.h has fls_long() that does this size test and calls the right thing.
>

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