linux-kernel - Re: [PATCH 09/15] powerpc/watchpoint: Convert thread_struct->hw

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Date:   Wed, 18 Mar 2020 09:56:48 +0100
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
Cc:     mpe@...erman.id.au, mikey@...ling.org, apopple@...ux.ibm.com,
        paulus@...ba.org, npiggin@...il.com,
        naveen.n.rao@...ux.vnet.ibm.com, peterz@...radead.org,
        jolsa@...nel.org, oleg@...hat.com, fweisbec@...il.com,
        mingo@...nel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 09/15] powerpc/watchpoint: Convert thread_struct->hw_brk
 to an array



Le 18/03/2020 à 09:36, Ravi Bangoria a écrit :
> 
> 
> On 3/17/20 4:07 PM, Christophe Leroy wrote:
>>
>>
>> Le 09/03/2020 à 09:58, Ravi Bangoria a écrit :
>>> So far powerpc hw supported only one watchpoint. But Future Power
>>> architecture is introducing 2nd DAWR. Convert thread_struct->hw_brk
>>> into an array.
>>
>> Looks like you are doing a lot more than that in this patch.
>>
>> Should this patch be splitted in two parts ?
> 
> So far thread_struct->hw_brk was a normal variable so accessing it was 
> simple.
> Once it gets converted into an array, loop needs to be used to access 
> it. So
> all misc changes are basically converting simple access into loops.
> 
> I don't see how this can be splitted.
> 

You could first change all thread_struct->hw_brk to 
thread_struct->hw_brk[0] or thread_struct->hw_brk[i] when you know that 
i can only be 0 for now. Then add the loops and new functions in a 
second patch.

Christophe