linux-kernel - Re: [PATCH v2 3/4] uprobes/powerpc: Introduce routines for save/restore context

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Message-ID: <50BCC9C7.8090609@in.ibm.com>
Date:	Mon, 03 Dec 2012 21:18:23 +0530
From:	"Suzuki K. Poulose" <suzuki@...ibm.com>
To:	ananth@...ibm.com
CC:	bigeasy@...utronix.de, oleg@...hat.com, srikar@...ux.vnet.ibm.com,
	peterz@...radead.org, benh@...nel.crashing.org, mingo@...e.hu,
	anton@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/4] uprobes/powerpc: Introduce routines for save/restore
 context

On 12/03/2012 08:45 PM, Ananth N Mavinakayanahalli wrote:
> On Mon, Dec 03, 2012 at 08:39:35PM +0530, Suzuki K. Poulose wrote:
>> From: Suzuki K. Poulose <suzuki@...ibm.com>
>>
>> Introduce routines for saving and restoring the context
>> befre/after the single step. No functional changes involved.
>>
>> These will be extended later to save/restore more info about
>> the process once we replace the ptrace helpers.
>>
>> Signed-off-by: Suzuki K. Poulose <suzuki@...ibm.com>
>> ---
>>   arch/powerpc/kernel/uprobes.c |   16 +++++++++++++---
>>   1 file changed, 13 insertions(+), 3 deletions(-)
>>
>> diff --git a/arch/powerpc/kernel/uprobes.c b/arch/powerpc/kernel/uprobes.c
>> index bc77834..1a62353 100644
>> --- a/arch/powerpc/kernel/uprobes.c
>> +++ b/arch/powerpc/kernel/uprobes.c
>> @@ -52,6 +52,16 @@ int arch_uprobe_analyze_insn(struct arch_uprobe *auprobe,
>>   	return 0;
>>   }
>>
>> +static void uprobe_save_context_sstep(struct arch_uprobe_task *autask)
>> +{
>> +	autask->saved_trap_nr = current->thread.trap_nr;
>> +}
>> +
>> +static void uprobe_restore_context_sstep(struct arch_uprobe_task *autask)
>> +{
>> +	current->thread.trap_nr = autask->saved_trap_nr;
>> +}
>
> Can't the two above be inline?
I had this discussion with Srikar and he was of the opinion that, we
should leave it as just static and let the compiler do the optimization.


Thanks
Suzuki

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