On Tue, 10 Jul 2018 10:25:19 +1000
"Tobin C. Harding" <m...@tobin.cc> wrote:
> Recently boot parameter 'debug_boot_weak_hash' was added. Latter
> discussion on LKML developed more descriptive documentation but due to
> the programmers lack of understanding (*cough* me) on how linux-next
> works these improvements never got picked up.
>
> Update documentation for boot parameter 'debug_boot_weak_hash' as
> discussed (patch posted and acked) on LKML.
>
> Fixes: bfe80ed3d7c76 ("vsprintf: add command line option
> debug_boot_weak_hash")
> Acked-by: Randy Dunlap <rdun...@infradead.org>
> Signed-off-by: Tobin C. Harding <m...@tobin.cc>
Reviewed-by: Steven Rostedt (VMware) <rost...@goodmis.org>
-- Steve
> ---
> Documentation/admin-guide/kernel-parameters.txt | 13 ++++++-------
> 1 file changed, 6 insertions(+), 7 deletions(-)
>
> diff --git a/Documentation/admin-guide/kernel-parameters.txt
> b/Documentation/admin-guide/kernel-parameters.txt
> index 31c9b76058a7..e3b1c84d19c6 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -749,13 +749,12 @@
> debug [KNL] Enable kernel debugging (events log level).
>
> debug_boot_weak_hash
> - [KNL] Enable printing pointers early in the boot
> - sequence. If 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 of '(___ptrval___)').
> - Cryptographically insecure, please do not use on
> - production kernels.
> + [KNL] Enable printing [hashed] pointers early in the
> + boot sequence. If enabled, we use a weak hash instead
> + of siphash to hash pointers. Use this option if you are
> + seeing instances of '(___ptrval___)') and need to see a
> + value (hashed pointer) instead. Cryptographically
> + insecure, please do not use on production kernels.
>
> debug_locks_verbose=
> [KNL] verbose self-tests
