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

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Date:	Sun, 31 Jan 2010 20:32:44 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Mahesh Jagannath Salgaonkar <mahesh@...ux.vnet.ibm.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 Sun, Jan 31, 2010 at 01:50:02PM +0530, Mahesh Jagannath Salgaonkar wrote:
> 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?


True. I'll fix both then, thanks!

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