Hi Paul,
Thanks for the suggestion.

Attached is the reworked patch for potential gUSA rollback users.

Thanks,
srini


Paul Mundt wrote:
> On Thu, Apr 07, 2011 at 01:57:09PM +0100, Srinivas KANDAGATLA wrote:
>   
>> Recently we have discovered a bug in xchg_u32 function of GUSA_RB feature.
>> This function breaks if one of the input parameter 'val' is r15.
>>
>>     168:    02 c7           mova    174 <exit_mm+0x54>,r0
>>     16a:    09 00           nop   
>>     16c:    f3 61           mov    r15,r1
>>     16e:    fc ef           mov    #-4,r15
>>     
>
> The -4 here is part of the gUSA login sequence, so if you're seeing the
> problem with gUSA based xchg_u32 it seems like you're going to have to
> apply the same fix for all gUSA rollback users.
>