linux-kernel - Re: [patch] HWBKPT: Make bp_len type to u64 generic across the arch

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Date:	Sun, 31 Jan 2010 13:50:02 +0530
From:	Mahesh Jagannath Salgaonkar <mahesh@...ux.vnet.ibm.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	Mahesh Salgaonkar <mahesh@...ux.vnet.in.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	"K. Prasad" <prasad@...ux.vnet.ibm.com>,
	Maneesh Soni <maneesh@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Martin <schwidefsky@...ibm.com>
Subject: Re: [patch] HWBKPT: Make bp_len type to u64 generic across the arch

On 01/31/2010 12:08 AM, Frederic Weisbecker wrote:
> On Sat, Jan 30, 2010 at 10:25:18AM +0530, Mahesh Salgaonkar wrote:
>>
>> Change 'bp_len' type to __u64 to make it work across the arch.
>> The s390 architecture watch point length can be upto 2^64.
>>
>> reference:
>> 	http://lkml.org/lkml/2010/1/25/212
>>
>> Based on commit 6aa41f8b01301199af6c9febb24f3c1f5a0bc9d5
>>
>> Signed-off-by: Mahesh Salgaonkar<mahesh@...ux.vnet.ibm.com>
>> ---
>>
>>   include/linux/hw_breakpoint.h |    2 +-
>>   include/linux/perf_event.h    |    6 ++----
>>   kernel/hw_breakpoint.c        |    2 +-
>>   kernel/perf_event.c           |    2 +-
>>   4 files changed, 5 insertions(+), 7 deletions(-)
>>
>>
>> diff --git a/include/linux/hw_breakpoint.h b/include/linux/hw_breakpoint.h
>> index 41235c9..76e7427 100644
>> --- a/include/linux/hw_breakpoint.h
>> +++ b/include/linux/hw_breakpoint.h
>> @@ -44,7 +44,7 @@ static inline int hw_breakpoint_type(struct perf_event *bp)
>>   	return bp->attr.bp_type;
>>   }
>>
>> -static inline int hw_breakpoint_len(struct perf_event *bp)
>> +static inline unsigned long hw_breakpoint_len(struct perf_event *bp)
>>   {
>>   	return bp->attr.bp_len;
>>   }
>
>
>
> This should return a u64, or gcc will warn us about loosing
> informations in 32 bits arch?
>
Yup, I even thought so, but then I figured out the function 
'hw_breakpoint_addr()' also has same return type for returning 
'attr.bp_addr' and kept the same type to be consistent. We may have to 
fix that also. What do you think?

>
>
>>
>
>
> Acked-by: Frederic Weisbecker<fweisbec@...il.com>
>

Thanks for reviewing.
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