linux-kernel - Re: [PATCH v2] powerpc/fadump: when fadump is supported register the fadump sysfs files.

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Date:   Thu, 29 Aug 2019 10:58:16 +0530
From:   Hari Bathini <hbathini@...ux.ibm.com>
To:     Michal Suchanek <msuchanek@...e.de>, linuxppc-dev@...ts.ozlabs.org
Cc:     Yangtao Li <tiny.windzz@...il.com>,
        Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>,
        linux-kernel@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
        Hari Bathini <hbathini@...ux.vnet.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v2] powerpc/fadump: when fadump is supported register the
 fadump sysfs files.



On 28/08/19 10:57 PM, Michal Suchanek wrote:
> Currently it is not possible to distinguish the case when fadump is
> supported by firmware and disabled in kernel and completely unsupported
> using the kernel sysfs interface. User can investigate the devicetree
> but it is more reasonable to provide sysfs files in case we get some
> fadumpv2 in the future.
> 
> With this patch sysfs files are available whenever fadump is supported
> by firmware.
> 
> Signed-off-by: Michal Suchanek <msuchanek@...e.de>
> ---

[...]

> -	if (!fw_dump.fadump_supported) {
> +	if (!fw_dump.fadump_supported && fw_dump.fadump_enabled) {
>  		printk(KERN_ERR "Firmware-assisted dump is not supported on"
>  			" this hardware\n");
> -		return 0;
>  	}

The above hunk is redundant with similar message already logged during
early boot in fadump_reserve_mem() function. I am not strongly against
this though. So...


Acked-by: Hari Bathini <hbathini@...ux.ibm.com>