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List:       linux-kernel
Subject:    Re: [PATCH] lockdep: increase static allocations
From:       Sasha Levin <sasha.levin () oracle ! com>
Date:       2014-02-28 19:32:25
Message-ID: 5310E449.1050609 () oracle ! com
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On 01/08/2014 02:21 PM, Sasha Levin wrote:
> Fuzzing a recent kernel with a large configuration hits the static
> allocation limits and disables lockdep.
>
> This patch doubles the limits.
>
> Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
> ---
>   kernel/locking/lockdep_internals.h | 6 +++---
>   1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/kernel/locking/lockdep_internals.h b/kernel/locking/lockdep_internals.h
> index 4f560cf..51c4b24 100644
> --- a/kernel/locking/lockdep_internals.h
> +++ b/kernel/locking/lockdep_internals.h
> @@ -54,9 +54,9 @@ enum {
>    * table (if it's not there yet), and we check it for lock order
>    * conflicts and deadlocks.
>    */
> -#define MAX_LOCKDEP_ENTRIES	16384UL
> +#define MAX_LOCKDEP_ENTRIES	32768UL
>
> -#define MAX_LOCKDEP_CHAINS_BITS	15
> +#define MAX_LOCKDEP_CHAINS_BITS	16
>   #define MAX_LOCKDEP_CHAINS	(1UL << MAX_LOCKDEP_CHAINS_BITS)
>
>   #define MAX_LOCKDEP_CHAIN_HLOCKS (MAX_LOCKDEP_CHAINS*5)
> @@ -65,7 +65,7 @@ enum {
>    * Stack-trace: tightly packed array of stack backtrace
>    * addresses. Protected by the hash_lock.
>    */
> -#define MAX_STACK_TRACE_ENTRIES	262144UL
> +#define MAX_STACK_TRACE_ENTRIES	524288UL
>
>   extern struct list_head all_lock_classes;
>   extern struct lock_chain lock_chains[];
>


Can someone pick the patch up please? PeterZ even (seemed to) acked it.


Thanks,
Sasha
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