linux-kernel - Re: [PATCH v3] x86/xen: Add some null pointer checking to smp.c

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Date: Mon, 22 Jan 2024 15:43:15 +0800
From: Kunwu Chan <chentao@...inos.cn>
To: Markus Elfring <Markus.Elfring@....de>, xen-devel@...ts.xenproject.org,
 kernel-janitors@...r.kernel.org, Boris Ostrovsky
 <boris.ostrovsky@...cle.com>, Borislav Petkov <bp@...en8.de>,
 Dave Hansen <dave.hansen@...ux.intel.com>, "H. Peter Anvin" <hpa@...or.com>,
 Ingo Molnar <mingo@...hat.com>, Jürgen Groß
 <jgross@...e.com>, Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org
Cc: kernel test robot <lkp@...el.com>, LKML <linux-kernel@...r.kernel.org>,
 Ilya Dryomov <idryomov@...il.com>, Jean Delvare <jdelvare@...e.de>,
 Jonathan Corbet <corbet@....net>
Subject: Re: [PATCH v3] x86/xen: Add some null pointer checking to smp.c

On 2024/1/20 22:45, Markus Elfring wrote:
>> kasprintf() returns a pointer to dynamically allocated memory
>> which can be NULL upon failure. Ensure the allocation was successful
>> by checking the pointer validity.
> 
> How do you think about to refer to the function name
> instead of the file name in the patch subject?
> 
The main goal is to assign a errno to rc. So use 'fail_mem is good to 
understand.
> 
> …
>> +++ b/arch/x86/xen/smp.c
> …
>> @@ -114,6 +124,8 @@ int xen_smp_intr_init(unsigned int cpu)
>>
>>   	return 0;
>>
>> + fail_mem:
>> +	rc = -ENOMEM;
>>    fail:
>>   	xen_smp_intr_free(cpu);
>>   	return rc;
> 
> Is it currently preferred to start labels in the first text column?
Just the same as the old one. I could fix it if necessary.

> 
> Regards,
> Markus
-- 
Thanks,
   Kunwu