linux-kernel - Re: [PATCH v22 1/9] kdump: return -ENOENT if required cmdline option does not exist

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Message-ID: <YmYaXDrEYOXLzT5H@MiWiFi-R3L-srv>
Date:   Mon, 25 Apr 2022 11:49:48 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Zhen Lei <thunder.leizhen@...wei.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H . Peter Anvin" <hpa@...or.com>,
        linux-kernel@...r.kernel.org, Dave Young <dyoung@...hat.com>,
        Vivek Goyal <vgoyal@...hat.com>,
        Eric Biederman <ebiederm@...ssion.com>,
        kexec@...ts.infradead.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        devicetree@...r.kernel.org, Jonathan Corbet <corbet@....net>,
        linux-doc@...r.kernel.org, Randy Dunlap <rdunlap@...radead.org>,
        Feng Zhou <zhoufeng.zf@...edance.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Chen Zhou <dingguo.cz@...group.com>,
        John Donnelly <John.p.donnelly@...cle.com>,
        Dave Kleikamp <dave.kleikamp@...cle.com>
Subject: Re: [PATCH v22 1/9] kdump: return -ENOENT if required cmdline option
 does not exist

On 04/14/22 at 07:57pm, Zhen Lei wrote:
> According to the current crashkernel=Y,low support in other ARCHes, it's
> an optional command-line option. When it doesn't exist, kernel will try
> to allocate minimum required memory below 4G automatically.
> 
> However, __parse_crashkernel() returns '-EINVAL' for all error cases. It
> can't distinguish the nonexistent option from invalid option.
> 
> Change __parse_crashkernel() to return '-ENOENT' for the nonexistent option
> case. With this change, crashkernel,low memory will take the default
> value if crashkernel=,low is not specified; while crashkernel reservation
> will fail and bail out if an invalid option is specified.
> 
> Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>

Acked-by: Baoquan He <bhe@...hat.com>

> ---
>  kernel/crash_core.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/kernel/crash_core.c b/kernel/crash_core.c
> index 256cf6db573cd09..4d57c03714f4e13 100644
> --- a/kernel/crash_core.c
> +++ b/kernel/crash_core.c
> @@ -243,9 +243,8 @@ static int __init __parse_crashkernel(char *cmdline,
>  	*crash_base = 0;
>  
>  	ck_cmdline = get_last_crashkernel(cmdline, name, suffix);
> -
>  	if (!ck_cmdline)
> -		return -EINVAL;
> +		return -ENOENT;
>  
>  	ck_cmdline += strlen(name);
>  
> -- 
> 2.25.1
>