[PATCH] kexec: crash: don't save swapper_pg_dir for !CONFIG_MMU configurations

[Simon Horman]

On Fri, Feb 24, 2012 at 02:40:47PM +0000, Will Deacon wrote:
> nommu platforms don't have very interesting swapper_pg_dir pointers and
> usually just #define them to NULL, meaning that we can't include them in
> the vmcoreinfo on the kexec crash path.
> 
> This patch only saves the swapper_pg_dir if we have an MMU.

Hi Will,

might this cover cases where swapper_pg_dir is interesting?

> Signed-off-by: Will Deacon <will.deacon at arm.com>
> ---
>  kernel/kexec.c |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
> 
> diff --git a/kernel/kexec.c b/kernel/kexec.c
> index 7b08867..cb5d13c 100644
> --- a/kernel/kexec.c
> +++ b/kernel/kexec.c
> @@ -1462,7 +1462,9 @@ static int __init crash_save_vmcoreinfo_init(void)
>  
>  	VMCOREINFO_SYMBOL(init_uts_ns);
>  	VMCOREINFO_SYMBOL(node_online_map);
> +#ifdef CONFIG_MMU
>  	VMCOREINFO_SYMBOL(swapper_pg_dir);
> +#endif
>  	VMCOREINFO_SYMBOL(_stext);
>  	VMCOREINFO_SYMBOL(vmlist);
>  
> -- 
> 1.7.4.1
> 
> 
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