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Commit e245d99e authored by Babu Moger's avatar Babu Moger Committed by David S. Miller
Browse files

lockdep: Limit static allocations if PROVE_LOCKING_SMALL is defined 



Reduce the size of data structure for lockdep entries by half if
PROVE_LOCKING_SMALL if defined. This is used only for sparc.

Signed-off-by: default avatarBabu Moger <babu.moger@oracle.com>
Acked-by: default avatarSam Ravnborg <sam@ravnborg.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent e6b5f1be

kernel/locking/lockdep_internals.h

+17 −3
Original line number Diff line number Diff line
@@ -45,6 +45,14 @@ enum { 
#define LOCKF_USED_IN_IRQ_READ \

		(LOCKF_USED_IN_HARDIRQ_READ | LOCKF_USED_IN_SOFTIRQ_READ)



/*

 * CONFIG_PROVE_LOCKING_SMALL is defined for sparc. Sparc requires .text,

 * .data and .bss to fit in required 32MB limit for the kernel. With

 * PROVE_LOCKING we could go over this limit and cause system boot-up problems.

 * So, reduce the static allocations for lockdeps related structures so that

 * everything fits in current required size limit.

 */

#ifdef CONFIG_PROVE_LOCKING_SMALL

/*

 * MAX_LOCKDEP_ENTRIES is the maximum number of lock dependencies

 * we track.
@@ -54,18 +62,24 @@ 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_CHAINS_BITS	15

#define MAX_STACK_TRACE_ENTRIES	262144UL

#else

#define MAX_LOCKDEP_ENTRIES	32768UL



#define MAX_LOCKDEP_CHAINS_BITS	16

#define MAX_LOCKDEP_CHAINS	(1UL << MAX_LOCKDEP_CHAINS_BITS)



#define MAX_LOCKDEP_CHAIN_HLOCKS (MAX_LOCKDEP_CHAINS*5)



/*

 * Stack-trace: tightly packed array of stack backtrace

 * addresses. Protected by the hash_lock.

 */

#define MAX_STACK_TRACE_ENTRIES	524288UL

#endif



#define MAX_LOCKDEP_CHAINS	(1UL << MAX_LOCKDEP_CHAINS_BITS)



#define MAX_LOCKDEP_CHAIN_HLOCKS (MAX_LOCKDEP_CHAINS*5)



extern struct list_head all_lock_classes;

extern struct lock_chain lock_chains[];