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[IA64] Fix rwsem: RWSEM_WAITING_BIAS must not be unsigned. 

Some nice improvements were made to rwsem in commit:

 424acaaeb3
 rwsem: wake queued readers when writer blocks on active read lock

but this change overlooked that ia64 had defined RWSEM_WAITING_BIAS
as an unsigned value, while the new code required a signed value (as
it is in every other architecture).

This fix suggested by the original patch author: Michel Lespinasse.

Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Tony Luck 2010-08-12 09:14:56 -07:00
parent 5af568cbd5
commit b680f0979f
1 changed files with 3 additions and 3 deletions
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6
arch/ia64/include/asm/rwsem.h
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@ -40,9 +40,9 @@ struct rw_semaphore {
};
#define RWSEM_UNLOCKED_VALUE __IA64_UL_CONST(0x0000000000000000)
#define RWSEM_ACTIVE_BIAS __IA64_UL_CONST(0x0000000000000001)
#define RWSEM_ACTIVE_MASK __IA64_UL_CONST(0x00000000ffffffff)
#define RWSEM_WAITING_BIAS -__IA64_UL_CONST(0x0000000100000000)
#define RWSEM_ACTIVE_BIAS (1L)
#define RWSEM_ACTIVE_MASK (0xffffffffL)
#define RWSEM_WAITING_BIAS (-0x100000000L)
#define RWSEM_ACTIVE_READ_BIAS RWSEM_ACTIVE_BIAS
#define RWSEM_ACTIVE_WRITE_BIAS (RWSEM_WAITING_BIAS + RWSEM_ACTIVE_BIAS)