linux-kernel - Re: [ANNOUNCE] mdb-2.6.27-rc2-ia32-08-07-08.patch

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Message-ID: <489B1BDC.1010504@s5r6.in-berlin.de>
Date:	Thu, 07 Aug 2008 17:59:24 +0200
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	jmerkey@...fmountaingroup.com
CC:	linux-kernel@...r.kernel.org
Subject: Re: [ANNOUNCE] mdb-2.6.27-rc2-ia32-08-07-08.patch

Stefan Richter wrote:
> jmerkey@...fmountaingroup.com wrote:
>> ftp://ftp.wolfmountaingroup.org/pub/mdb/mdb-2.6.27-rc2-ia32-08-07-08.patch
...
>> +typedef struct _RLOCK 
>> +{
>> +#if defined(CONFIG_SMP)
>> +    spinlock_t lock;
>> +#endif
>> +    unsigned long flags;
>> +    unsigned long processor;
>> +    unsigned long count;    
>> +} rlock_t;
...
> The accessors rspin_lock() and rspin_try_lock() peek into spinlock_t and
> may therefore not be fully portable.  Also, they and rspin_unlock()
> don't look SMP safe:
...
>> +   if (rlock->lock.raw_lock.slock && rlock->processor == proc)

Correction:  They _are_ not portable.  Look at the first hit in
http://lxr.linux.no/linux+v2.6.26/+code=raw_spinlock_t .
-- 
Stefan Richter
-=====-==--- =--- --===
http://arcgraph.de/sr/
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