linux-kernel - Re: [PATCH 4/4] kaslr: clean up a useless variable and some usless space

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Date:   Fri, 20 Oct 2017 12:10:37 +0800
From:   Chao Fan <fanc.fnst@...fujitsu.com>
To:     Dou Liyang <douly.fnst@...fujitsu.com>
CC:     <linux-kernel@...r.kernel.org>, <x86@...nel.org>, <hpa@...or.com>,
        <tglx@...utronix.de>, <mingo@...hat.com>, <bhe@...hat.com>,
        <keescook@...omium.org>, <indou.takao@...fujitsu.com>,
        <caoj.fnst@...fujitsu.com>
Subject: Re: [PATCH 4/4] kaslr: clean up a useless variable and some usless
 space

On Fri, Oct 20, 2017 at 11:19:48AM +0800, Dou Liyang wrote:
>Hi Chao,
>
>At 10/19/2017 06:02 PM, Chao Fan wrote:
>> There are two same variable "rc" in this function. One is in the
>> circulation, the other is out of the circulation. The one out will never
>> be used, so drop it.
>> 
>> Signed-off-by: Chao Fan <fanc.fnst@...fujitsu.com>
>> ---
>>  arch/x86/boot/compressed/kaslr.c | 5 ++---
>>  1 file changed, 2 insertions(+), 3 deletions(-)
>> 
>> diff --git a/arch/x86/boot/compressed/kaslr.c b/arch/x86/boot/compressed/kaslr.c
>> index 22330cbe8515..8a33ed82fd0b 100644
>> --- a/arch/x86/boot/compressed/kaslr.c
>> +++ b/arch/x86/boot/compressed/kaslr.c
>> @@ -198,7 +198,6 @@ static int parse_immovable_mem(char *p,
>>  static void mem_avoid_memmap(char *str)
>>  {
>>  	static int i;
>> -	int rc;
>> 
>>  	if (i >= MAX_MEMMAP_REGIONS)
>>  		return;

Hi Dou-san,

>
>Seems it is redundant too,

Thanks for your suggestion.

Thanks,
Chao Fan

>
>Thanks,
>	dou.
>
>> @@ -277,7 +276,7 @@ static int handle_mem_memmap(void)
>>  		return 0;
>> 
>>  	tmp_cmdline = malloc(len + 1);
>> -	if (!tmp_cmdline )
>> +	if (!tmp_cmdline)
>>  		error("Failed to allocate space for tmp_cmdline");
>> 
>>  	memcpy(tmp_cmdline, args, len);
>> @@ -423,7 +422,7 @@ static void mem_avoid_init(unsigned long input, unsigned long input_size,
>>  	cmd_line |= boot_params->hdr.cmd_line_ptr;
>>  	/* Calculate size of cmd_line. */
>>  	ptr = (char *)(unsigned long)cmd_line;
>> -	for (cmd_line_size = 0; ptr[cmd_line_size++]; )
>> +	for (cmd_line_size = 0; ptr[cmd_line_size++];)
>>  		;
>>  	mem_avoid[MEM_AVOID_CMDLINE].start = cmd_line;
>>  	mem_avoid[MEM_AVOID_CMDLINE].size = cmd_line_size;
>>