linux-kernel - Re: [PATCH] lib/test_kho: Check if KHO is enabled

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Message-ID: <mafs0cy5ub0nc.fsf@kernel.org>
Date: Fri, 07 Nov 2025 11:24:55 +0100
From: Pratyush Yadav <pratyush@...nel.org>
To: Pasha Tatashin <pasha.tatashin@...een.com>
Cc: akpm@...ux-foundation.org,  rppt@...nel.org,  graf@...zon.com,
  linux-kernel@...r.kernel.org,  kexec@...ts.infradead.org,
  linux-mm@...ck.org,  pratyush@...nel.org
Subject: Re: [PATCH] lib/test_kho: Check if KHO is enabled

On Thu, Nov 06 2025, Pasha Tatashin wrote:

> We must check whether KHO is enabled prior to issuing KHO commands,
> otherwise KHO internal data structures are not initialized.

Should we have this check in the KHO APIs instead? This check is easy
enough to miss.

>
> Fixes: b753522bed0b ("kho: add test for kexec handover")
>

Nit: these blank lines would probably mess up trailer parsing for
tooling.

> Reported-by: kernel test robot <oliver.sang@...el.com>
> Closes: https://lore.kernel.org/oe-lkp/202511061629.e242724-lkp@intel.com
>
> Signed-off-by: Pasha Tatashin <pasha.tatashin@...een.com>
> ---
>  lib/test_kho.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/lib/test_kho.c b/lib/test_kho.c
> index 025ea251a186..85b60d87a50a 100644
> --- a/lib/test_kho.c
> +++ b/lib/test_kho.c
> @@ -315,6 +315,9 @@ static int __init kho_test_init(void)
>  	phys_addr_t fdt_phys;
>  	int err;
>  
> +	if (!kho_is_enabled())
> +		return 0;
> +
>  	err = kho_retrieve_subtree(KHO_TEST_FDT, &fdt_phys);
>  	if (!err)
>  		return kho_test_restore(fdt_phys);

-- 
Regards,
Pratyush Yadav