powerpc/fadump: skip parameter area allocation when fadump is disabled

[Hari Bathini]

On 07/10/25 1:10 pm, Sourabh Jain wrote:
> Fadump allocates memory to pass additional kernel command-line argument
> to the fadump kernel. However, this allocation is not needed when fadump
> is disabled. So avoid allocating memory for the additional parameter
> area in such cases.
> 

This needs the fixes tag...

Fixes: f4892c68ecc1 ("powerpc/fadump: allocate memory for additional 
parameters early")

Otherwise, looks good to me.

Reviewed-by: Hari Bathini <hbathini at linux.ibm.com>

> Cc: Hari Bathini <hbathini at linux.ibm.com>
> Cc: Madhavan Srinivasan <maddy at linux.ibm.com>
> Cc: Michael Ellerman <mpe at ellerman.id.au>
> Signed-off-by: Sourabh Jain <sourabhjain at linux.ibm.com>
> ---
>   arch/powerpc/kernel/fadump.c | 3 +++
>   1 file changed, 3 insertions(+)
> 
> diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c
> index 5782e743fd27..4ebc333dd786 100644
> --- a/arch/powerpc/kernel/fadump.c
> +++ b/arch/powerpc/kernel/fadump.c
> @@ -1747,6 +1747,9 @@ void __init fadump_setup_param_area(void)
>   {
>   	phys_addr_t range_start, range_end;
>   
> +	if (!fw_dump.fadump_enabled)
> +		return;
> +
>   	if (!fw_dump.param_area_supported || fw_dump.dump_active)
>   		return;
>