linux-kernel - Re: [PATCH] powerpc/hw_breakpoint: move instruction stepping out of hw_breakpoint

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Message-Id: <d0358cc8-00e2-cd5a-9a4f-f9eae1548026@linux.ibm.com>
Date:   Mon, 8 Jul 2019 09:10:54 +0530
From:   Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
To:     Christophe Leroy <christophe.leroy@....fr>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
Subject: Re: [PATCH] powerpc/hw_breakpoint: move instruction stepping out of
 hw_breakpoint_handler()



On 7/6/19 1:56 PM, Christophe Leroy wrote:
> 
> 
> Le 03/07/2019 à 08:20, Ravi Bangoria a écrit :
>>
>>
>> On 6/28/19 9:25 PM, Christophe Leroy wrote:
>>> On 8xx, breakpoints stop after executing the instruction, so
>>> stepping/emulation is not needed. Move it into a sub-function and
>>> remove the #ifdefs.
>>>
>>> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
>>> ---
>>
>> Reviewed-by: Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
>>
>> Just one neat below...
> 
> Thanks for the review.
> 
>>
>> [...]
>>
>>> -#ifndef CONFIG_PPC_8xx
>>> -    /* Do not emulate user-space instructions, instead single-step them */
>>> -    if (user_mode(regs)) {
>>> -        current->thread.last_hit_ubp = bp;
>>> -        regs->msr |= MSR_SE;
>>> +    if (!IS_ENABLED(CONFIG_PPC_8xx) && !stepping_handler(regs, bp, info->address))
>>
>> May be split this line. It's 86 chars long and checkpatch.pl is warning
>> about this:
> 
> Didn't you use arch/powerpc/tools/checkpatch.sh ?
> 
> powerpc accepts 90 chars per line.

Hmm.. wasn't aware of it. Thanks!