linux-kernel - Re: [PATCH 1/2] elf: simpler check for -EEXIST

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Message-ID: <52458645-823f-825e-660f-7b01d5dbb979@i-love.sakura.ne.jp>
Date:   Fri, 15 Mar 2019 07:02:23 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
To:     Alexey Dobriyan <adobriyan@...il.com>, akpm@...ux-foundation.org
Cc:     linux-kernel@...r.kernel.org, Michal Hocko <mhocko@...nel.org>
Subject: Re: [PATCH 1/2] elf: simpler check for -EEXIST

On 2019/03/15 5:42, Alexey Dobriyan wrote:
> 	PTR_ERR((void *)map_addr) == -EEXIST
> 
> is a very complicated way of doing the obvious.

Michal suggested me to explicitly use PTR_ERR() for documentation purpose in
a reply mail to https://lkml.kernel.org/r/20180418115546.GZ17484@dhcp22.suse.cz .

> 
> Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
> ---
> 
>  fs/binfmt_elf.c |    3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> --- a/fs/binfmt_elf.c
> +++ b/fs/binfmt_elf.c
> @@ -375,8 +375,7 @@ static unsigned long elf_map(struct file *filep, unsigned long addr,
>  	} else
>  		map_addr = vm_mmap(filep, addr, size, prot, type, off);
>  
> -	if ((type & MAP_FIXED_NOREPLACE) &&
> -	    PTR_ERR((void *)map_addr) == -EEXIST)
> +	if ((type & MAP_FIXED_NOREPLACE) && map_addr == -EEXIST)
>  		pr_info("%d (%s): Uhuuh, elf segment at %px requested but the memory is mapped already\n",
>  			task_pid_nr(current), current->comm, (void *)addr);
>  
>