linux-kernel - Re: [PATCH 2/2] x86/mm/64: Add vsyscall page to /proc/kcore conditionally

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Date:   Fri, 9 Feb 2018 09:08:03 +0800
From:   Jia Zhang <zhang.jia@...ux.alibaba.com>
To:     tglx@...utronix.de, mingo@...hat.com, hpa@...or.com
Cc:     Jiri Olsa <jolsa@...hat.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] x86/mm/64: Add vsyscall page to /proc/kcore
 conditionally

Hi,

Anybody else here who can give an attention on this review?

Thanks,
Jia

On 2018/2/5 下午5:26, Jiri Olsa wrote:
> On Tue, Jan 30, 2018 at 02:42:59PM +0800, Jia Zhang wrote:
>> The vsyscall page should be visible only if
>> vsyscall=emulate/native when dumping /proc/kcore.
>>
>> Signed-off-by: Jia Zhang <zhang.jia@...ux.alibaba.com>
>> ---
>>  arch/x86/mm/init_64.c | 5 +++--
>>  1 file changed, 3 insertions(+), 2 deletions(-)
>>
>> diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
>> index dab78f6..3d4cf33 100644
>> --- a/arch/x86/mm/init_64.c
>> +++ b/arch/x86/mm/init_64.c
>> @@ -1186,8 +1186,9 @@ void __init mem_init(void)
>>  	register_page_bootmem_info();
>>  
>>  	/* Register memory areas for /proc/kcore */
>> -	kclist_add(&kcore_vsyscall, (void *)VSYSCALL_ADDR,
>> -		   PAGE_SIZE, KCORE_USER);
>> +	if (get_gate_vma(&init_mm))
>> +		kclist_add(&kcore_vsyscall, (void *)VSYSCALL_ADDR,
>> +			   PAGE_SIZE, KCORE_USER);
> 
> nit, we use { } when there's more than 1 line code 
> 
> anyway the approach looks ok to me
> 
> Reviewed-by: Jiri Olsa <jolsa@...nel.org>
> 
> thanks,
> jirka
>