linux-kernel - Re: [PATCH] lockdep: increase static allocations

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Message-ID: <53431DE7.4040302@oracle.com>
Date:	Mon, 07 Apr 2014 17:51:35 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	peterz@...radead.org, mingo@...hat.com
CC:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] lockdep: increase static allocations

On 02/28/2014 02:32 PM, Sasha Levin wrote:
> 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@...cle.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.

Pretty please? A few people reported that they do what the patch does
to get lockdep working right for them, and there were no objections to
the patch.


Thanks,
Sasha

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