clearlinux/kvmtool
2
0
Fork 0
mirror of https://github.com/clearlinux/kvmtool.git synced 2026-06-16 02:15:47 +00:00
Code Issues Packages Projects Releases Wiki Activity

kvm tools: Add debug mode to brlock

Browse Source 
Adds a debug mode which allows to switch the brlock into
a big rwlock.
This can be used to verify we don't end up with a BKL kind
of lock with the current brlock implementation.

Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This commit is contained in:
Sasha Levin
2011-05-30 20:27:57 +03:00
committed by Will Deacon
parent a009444e08
commit 5124781543
1 changed files with 16 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/kvm/brlock.h
+16
View File
@@ -17,9 +17,25 @@
#define barrier() __asm__ __volatile__("": : :"memory")
#endif
#ifdef KVM_BRLOCK_DEBUG
#include "kvm/rwsem.h"
DECLARE_RWSEM(brlock_sem);
#define br_read_lock() down_read(&brlock_sem);
#define br_read_unlock() up_read(&brlock_sem);
#define br_write_lock() down_write(&brlock_sem);
#define br_write_unlock() up_write(&brlock_sem);
#else
#define br_read_lock() barrier()
#define br_read_unlock() barrier()
#define br_write_lock() kvm__pause()
#define br_write_unlock() kvm__continue()
#endif
#endif