linux-kernel - Re: [PATCH 8/8] Staging: lustre :lustre: include :lustre

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Date:   Wed, 12 Jul 2017 05:13:11 +0000
From:   "Dilger, Andreas" <andreas.dilger@...el.com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     Jaya Durga <rjdurga@...il.com>,
        "Drokin, Oleg" <oleg.drokin@...el.com>,
        "jsimmons@...radead.org" <jsimmons@...radead.org>,
        "Hammond, John" <john.hammond@...el.com>,
        "bobijam@...mail.com" <bobijam@...mail.com>,
        "mingo@...nel.org" <mingo@...nel.org>,
        "lustre-devel@...ts.lustre.org" <lustre-devel@...ts.lustre.org>,
        "devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 8/8] Staging: lustre :lustre: include :lustre_compat.h:
 Prefer using the BIT macro


> On Jul 11, 2017, at 11:08, Greg KH <gregkh@...uxfoundation.org> wrote:
> 
> On Thu, Jul 06, 2017 at 12:43:15PM +0530, Jaya Durga wrote:
>> Replace all instances of (1 << 27) with BIT(27) to fix
>> checkpatch check messages
>> 
>> Signed-off-by: Jaya Durga <rjdurga@...il.com>
>> ---
>> drivers/staging/lustre/lustre/include/lustre_compat.h | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>> 
>> diff --git a/drivers/staging/lustre/lustre/include/lustre_compat.h b/drivers/staging/lustre/lustre/include/lustre_compat.h
>> index da9ce19..686a251 100644
>> --- a/drivers/staging/lustre/lustre/include/lustre_compat.h
>> +++ b/drivers/staging/lustre/lustre/include/lustre_compat.h
>> @@ -43,7 +43,7 @@
>>  * set ATTR_BLOCKS to a high value to avoid any risk of collision with other
>>  * ATTR_* attributes (see bug 13828)
>>  */
>> -#define ATTR_BLOCKS    (1 << 27)
>> +#define ATTR_BLOCKS    BIT(27)
> 
> Isn't this used in lustre's userspace code?  If so, you can't use the
> BIT() macro there :(
> 
> Please check before you redo this.

The "lustre_compat.h" header was previously used for compatibility between different kernel
versions, which is why it is now basically empty.  It isn't used for userspace interfaces
as other "compat" headers are in the kernel.

Cheers, Andreas
--
Andreas Dilger
Lustre Principal Architect
Intel Corporation