linux-kernel - Re: [PATCH v3 2/3] lockdep: clarify size for LOCKDEP_*

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <19e32325-8e1b-4a9b-ae74-22448847d189@redhat.com>
Date: Thu, 24 Oct 2024 15:00:48 -0400
From: Waiman Long <llong@...hat.com>
To: Carlos Llamas <cmllamas@...gle.com>, Boqun Feng <boqun.feng@...il.com>,
 Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, kernel-team@...roid.com,
 Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
 Will Deacon <will@...nel.org>
Subject: Re: [PATCH v3 2/3] lockdep: clarify size for LOCKDEP_*_BITS configs

On 10/24/24 2:36 PM, Carlos Llamas wrote:
> The LOCKDEP_*_BITS configs control the size of internal structures used
> by lockdep. The size is calculated as a power of two of the configured
> value (e.g. 16 => 64KB). Update these descriptions to more accurately
> reflect this, as "Bitsize" can be misleading.
>
> Suggested-by: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Boqun Feng <boqun.feng@...il.com>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Waiman Long <longman@...hat.com>
> Cc: Will Deacon <will@...nel.org>
> Signed-off-by: Carlos Llamas <cmllamas@...gle.com>
> ---
>   lib/Kconfig.debug | 10 +++++-----
>   1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> index c8b1db37abe6..5a769cbf4bb2 100644
> --- a/lib/Kconfig.debug
> +++ b/lib/Kconfig.debug
> @@ -1522,7 +1522,7 @@ config LOCKDEP_SMALL
>   	bool
>   
>   config LOCKDEP_BITS
> -	int "Bitsize for MAX_LOCKDEP_ENTRIES"
> +	int "Size for MAX_LOCKDEP_ENTRIES (as Nth power of 2)"
>   	depends on LOCKDEP && !LOCKDEP_SMALL
>   	range 10 24
>   	default 15
> @@ -1530,7 +1530,7 @@ config LOCKDEP_BITS
>   	  Try increasing this value if you hit "BUG: MAX_LOCKDEP_ENTRIES too low!" message.
>   
>   config LOCKDEP_CHAINS_BITS
> -	int "Bitsize for MAX_LOCKDEP_CHAINS"
> +	int "Size for MAX_LOCKDEP_CHAINS (as Nth power of 2)"
>   	depends on LOCKDEP && !LOCKDEP_SMALL
>   	range 10 21
>   	default 16
> @@ -1538,7 +1538,7 @@ config LOCKDEP_CHAINS_BITS
>   	  Try increasing this value if you hit "BUG: MAX_LOCKDEP_CHAINS too low!" message.
>   
>   config LOCKDEP_STACK_TRACE_BITS
> -	int "Bitsize for MAX_STACK_TRACE_ENTRIES"
> +	int "Size for MAX_STACK_TRACE_ENTRIES (as Nth power of 2)"
>   	depends on LOCKDEP && !LOCKDEP_SMALL
>   	range 10 26
>   	default 19
> @@ -1546,7 +1546,7 @@ config LOCKDEP_STACK_TRACE_BITS
>   	  Try increasing this value if you hit "BUG: MAX_STACK_TRACE_ENTRIES too low!" message.
>   
>   config LOCKDEP_STACK_TRACE_HASH_BITS
> -	int "Bitsize for STACK_TRACE_HASH_SIZE"
> +	int "Size for STACK_TRACE_HASH_SIZE (as Nth power of 2)"
>   	depends on LOCKDEP && !LOCKDEP_SMALL
>   	range 10 26
>   	default 14
> @@ -1554,7 +1554,7 @@ config LOCKDEP_STACK_TRACE_HASH_BITS
>   	  Try increasing this value if you need large STACK_TRACE_HASH_SIZE.
>   
>   config LOCKDEP_CIRCULAR_QUEUE_BITS
> -	int "Bitsize for elements in circular_queue struct"
> +	int "Size for elements in circular_queue struct (as Nth power of 2)"
>   	depends on LOCKDEP
>   	range 10 26
>   	default 12
Acked-by: Waiman Long <longman@...hat.com>