Re: [PATCH] vsprintf: Add command line option debug_boot_weak_hash

[Randy Dunlap]

On 05/14/2018 09:38 PM, Tobin C. Harding wrote:

>  Documentation/admin-guide/kernel-parameters.txt |  8 ++++++++
>  lib/vsprintf.c                                  | 18 ++++++++++++++++++
>  2 files changed, 26 insertions(+)
> 
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 3b8032431585..c95dd6704592 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -748,6 +748,14 @@
>  
>  	debug		[KNL] Enable kernel debugging (events log level).
>  
> +	debug_boot_weak_hash
> +			[KNL] Enable debugging early in the boot sequence.  If

That makes it sound like "debug_boot_weak_hash" turns on early debugging.

> +			enabled, we use a weak hash instead of siphash to hash
> +			pointers.  Use this option if you need to see pointer
> +			values during early boot (i.e you are seeing instances

			                          i.e.

> +			of '(___ptrval___)') - cryptographically insecure,
> +			please do not use on production kernels.
> +
>  	debug_locks_verbose=
>  			[KNL] verbose self-tests
>  			Format=<0|1>


-- 
~Randy