dma-debug: Put all hash-chain locks into the same lock class
commitb0a5b83ee0fce9dbf8ff5fe1f8c9ae7dfafe458c
authorIngo Molnar <mingo@elte.hu>
Tue, 16 Jun 2009 14:11:14 +0000 (16 16:11 +0200)
committerJoerg Roedel <joerg.roedel@amd.com>
Wed, 17 Jun 2009 14:26:04 +0000 (17 16:26 +0200)
treef36980eeb5eb2205478a523769b6730a19d9a3cf
parentc79ee4e466dd12347f112e2af306dca35198458f
dma-debug: Put all hash-chain locks into the same lock class

Alan Cox reported that lockdep runs out of its stack-trace entries
with certain configs:

 BUG: MAX_STACK_TRACE_ENTRIES too low

This happens because there are 1024 hash buckets, each with a
separate lock. Lockdep puts each lock into a separate lock class and
tracks them independently.

But in reality we never take more than one of the buckets, so they
really belong into a single lock-class. Annotate the has bucket lock
init accordingly.

[ Impact: reduce the lockdep footprint of dma-debug ]

Reported-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
lib/dma-debug.c