linux-kernel - Re: [PATCH v2 1/1] kdump: append uts_namespace.name offset to VMCOREINFO

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Date:   Fri, 25 Sep 2020 11:18:50 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Alexander Egorenkov <egorenar@...ux.ibm.com>
Cc:     dyoung@...hat.com, vgoyal@...hat.com, ebiederm@...ssion.com,
        akpm@...ux-foundation.org, ktkhai@...tuozzo.com,
        keescook@...omium.org, christian.brauner@...ntu.com,
        kexec@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/1] kdump: append uts_namespace.name offset to
 VMCOREINFO

On 09/24/20 at 02:46pm, Alexander Egorenkov wrote:
> The offset of the field 'init_uts_ns.name' has changed
> since
> 
> commit 9a56493f6942c0e2df1579986128721da96e00d8
> Author: Kirill Tkhai <ktkhai@...tuozzo.com>
> Date:   Mon Aug 3 13:16:21 2020 +0300
> 
>     uts: Use generic ns_common::count
> 
> Link: https://lore.kernel.org/r/159644978167.604812.1773586504374412107.stgit@localhost.localdomain

Seems there's some argument about the generic ns_common::count in the
thread of above link. While except of it, the adding the offset of
uts_namespace.name looks good to me.

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


> 
> Make the offset of the field 'uts_namespace.name' available
> in VMCOREINFO because tools like 'crash-utility' and
> 'makedumpfile' must be able to read it from crash dumps.
> 
> Signed-off-by: Alexander Egorenkov <egorenar@...ux.ibm.com>
> ---
>  kernel/crash_core.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/kernel/crash_core.c b/kernel/crash_core.c
> index 106e4500fd53..173fdc261882 100644
> --- a/kernel/crash_core.c
> +++ b/kernel/crash_core.c
> @@ -447,6 +447,7 @@ static int __init crash_save_vmcoreinfo_init(void)
>  	VMCOREINFO_PAGESIZE(PAGE_SIZE);
>  
>  	VMCOREINFO_SYMBOL(init_uts_ns);
> +	VMCOREINFO_OFFSET(uts_namespace, name);
>  	VMCOREINFO_SYMBOL(node_online_map);
>  #ifdef CONFIG_MMU
>  	VMCOREINFO_SYMBOL_ARRAY(swapper_pg_dir);
> -- 
> 2.26.2
>