linux-kernel - Re: [patch 3/3] S390-HWBKPT v3: Modify ptrace to use Hardware Breakpoint interfaces.

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Message-ID: <4B57E905.1060900@linux.vnet.ibm.com>
Date:	Thu, 21 Jan 2010 11:11:25 +0530
From:	Mahesh Jagannath Salgaonkar <mahesh@...ux.vnet.ibm.com>
To:	Linux Kernel <linux-kernel@...r.kernel.org>, ffweisbec@...il.com
CC:	Heiko Carstens <heiko.carstens@...ibm.com>, schwidefsky@...ibm.com,
	"K.Prasad" <prasad@...ux.vnet.ibm.com>
Subject: Re: [patch 3/3] S390-HWBKPT v3: Modify ptrace to use Hardware Breakpoint
 interfaces.

Heiko Carstens wrote:
> On Thu, Jan 14, 2010 at 11:58:59AM +0530, Mahesh Salgaonkar wrote:
>> Modify the ptrace code to use the hardware breakpoint interfaces for
>> user-space
> 
> I didn't look too deep into this one. So actually only one trivial comment:
> 
>> diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
>> index 9a1d276..cb74f24 100644
>> --- a/include/linux/perf_event.h
>> +++ b/include/linux/perf_event.h
>> @@ -215,7 +215,11 @@ struct perf_event_attr {
>>
>>  	__u64			bp_addr;
>>  	__u32			bp_type;
>> +#ifdef __s390x__
>> +	__u64			bp_len;
>> +#else
>>  	__u32			bp_len;
>> +#endif
>>  };
>>
>>  /*
>>
> 
> Any chance to change common code to change that to an __u64 (unconditional)
> or at least an unsigned long?
> I'd hate to see an ifdef __s390x__ in common code.

Can we have the above common code to change the type of 'bp_len' to 
__u64? In s390x arch watch point length can be upto 2^64.
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