linux-kernel - Re: [PATCH 1/2] kexec: Set KEXEC_TYPE_CRASH before sanity_check_segment

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Message-ID: <565E89C3.40608@redhat.com>
Date:	Wed, 2 Dec 2015 14:03:47 +0800
From:	Xunlei Pang <xlpang@...hat.com>
To:	Dave Young <dyoung@...hat.com>
Cc:	linux-kernel@...r.kernel.org, kexec@...ts.infradead.org,
	Eric Biederman <ebiederm@...ssion.com>,
	akpm@...ux-foundation.org
Subject: Re: [PATCH 1/2] kexec: Set KEXEC_TYPE_CRASH before
 sanity_check_segment_list()

Hi Dave,

On 12/02/2015 at 01:47 PM, Dave Young wrote:
> Ccing Andrew since usually he monitors and picks up kexec patches.
>
> On 12/02/15 at 01:26pm, Xunlei Pang wrote:
>> sanity_check_segment_list() checks KEXEC_TYPE_CRASH flag to ensure
>> all the segments of the loaded crash kernel are winthin the kernel
>> crash resource limits, so set the flag beforehand.
> Looks good except a nitpick, see comments inline.
>
> Otherwise:
> Acked-by: Dave Young <dyoung@...hat.com>
>
>> Signed-off-by: Xunlei Pang <xlpang@...hat.com>
>> ---
>>  kernel/kexec.c | 13 ++++++++-----
>>  1 file changed, 8 insertions(+), 5 deletions(-)
>>
>> diff --git a/kernel/kexec.c b/kernel/kexec.c
>> index d873b64..9624391 100644
>> --- a/kernel/kexec.c
>> +++ b/kernel/kexec.c
>> @@ -63,16 +63,19 @@ static int kimage_alloc_init(struct kimage **rimage, unsigned long entry,
>>  	if (ret)
>>  		goto out_free_image;
>>  
>> -	ret = sanity_check_segment_list(image);
>> -	if (ret)
>> -		goto out_free_image;
>> -
>> -	 /* Enable the special crash kernel control page allocation policy. */
>> +	/*
>> +	 * Enable the special crash kernel control page allocation policy,
>> +	 * and set the crash type flag.
> It is obvious it is setting the crash type flag, so no need to add extra
> comment.
>
>> +	 */
>>  	if (kexec_on_panic) {
> Like kexec_file.c, move /* Enable ... policy */ here sounds better.

Yea, this is better. Will do, thanks.

Regards,
Xunlei

>  
>>  		image->control_page = crashk_res.start;
>>  		image->type = KEXEC_TYPE_CRASH;
>>  	}
>>  
>> +	ret = sanity_check_segment_list(image);
>> +	if (ret)
>> +		goto out_free_image;
>> +
>>  	/*
>>  	 * Find a location for the control code buffer, and add it
>>  	 * the vector of segments so that it's pages will also be
>> -- 
>> 2.5.0
>>
> Thanks
> Dave

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