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Tue, 25 Aug 2020 11:08:01 GMT Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 3B83E42047; Tue, 25 Aug 2020 11:08:01 +0000 (GMT) Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7BE2F42049; Tue, 25 Aug 2020 11:07:58 +0000 (GMT) Received: from [9.199.33.167] (unknown [9.199.33.167]) by d06av24.portsmouth.uk.ibm.com (Postfix) with ESMTP; Tue, 25 Aug 2020 11:07:58 +0000 (GMT) Subject: Re: [PATCH v5 5/8] powerpc/watchpoint: Fix exception handling for CONFIG_HAVE_HW_BREAKPOINT=N To: Christophe Leroy , christophe.leroy@c-s.fr References: <20200825043617.1073634-1-ravi.bangoria@linux.ibm.com> <20200825043617.1073634-6-ravi.bangoria@linux.ibm.com> <91d34b89-603a-fddc-ea0f-53a79b287eed@csgroup.eu> From: Ravi Bangoria Message-ID: <1e706137-3de9-a713-5a86-48fbc5e6f740@linux.ibm.com> Date: Tue, 25 Aug 2020 16:37:57 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <91d34b89-603a-fddc-ea0f-53a79b287eed@csgroup.eu> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235, 18.0.687 definitions=2020-08-25_02:2020-08-25, 2020-08-25 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 malwarescore=0 clxscore=1011 priorityscore=1501 impostorscore=0 phishscore=0 spamscore=0 bulkscore=0 adultscore=0 mlxscore=0 lowpriorityscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2008250083 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Ravi Bangoria , mikey@neuling.org, pedromfc@linux.ibm.com, linux-kernel@vger.kernel.org, paulus@samba.org, jniethe5@gmail.com, rogealve@linux.ibm.com, naveen.n.rao@linux.vnet.ibm.com, linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Hi Christophe, >> diff --git a/arch/powerpc/kernel/ptrace/ptrace-noadv.c b/arch/powerpc/kernel/ptrace/ptrace-noadv.c >> index 57a0ab822334..866597b407bc 100644 >> --- a/arch/powerpc/kernel/ptrace/ptrace-noadv.c >> +++ b/arch/powerpc/kernel/ptrace/ptrace-noadv.c >> @@ -286,11 +286,16 @@ long ppc_del_hwdebug(struct task_struct *child, long data) >>       } >>       return ret; >>   #else /* CONFIG_HAVE_HW_BREAKPOINT */ >> +    if (child->thread.hw_brk[data - 1].flags & HW_BRK_FLAG_DISABLED) > > I think child->thread.hw_brk[data - 1].flags & HW_BRK_FLAG_DISABLED should go around additionnal () Not sure I follow. > >> +        goto del; >> + >>       if (child->thread.hw_brk[data - 1].address == 0) >>           return -ENOENT; > > What about replacing the above if by: >     if (!(child->thread.hw_brk[data - 1].flags) & HW_BRK_FLAG_DISABLED) && >         child->thread.hw_brk[data - 1].address == 0) >         return -ENOENT; okay.. that's more compact. But more importantly, what I wanted to know is whether CONFIG_HAVE_HW_BREAKPOINT is set or not in production/distro builds for 8xx. Because I see it's not set in 8xx defconfigs. Thanks, Ravi