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 11:19:48 +0800
From:   Dou Liyang <douly.fnst@...fujitsu.com>
To:     Chao Fan <fanc.fnst@...fujitsu.com>,
        <linux-kernel@...r.kernel.org>, <x86@...nel.org>, <hpa@...or.com>,
        <tglx@...utronix.de>, <mingo@...hat.com>, <bhe@...hat.com>,
        <keescook@...omium.org>
CC:     <indou.takao@...fujitsu.com>, <caoj.fnst@...fujitsu.com>
Subject: Re: [PATCH 4/4] kaslr: clean up a useless variable and some usless
 space

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;

Seems it is redundant too,

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;
>