diff options
| author | David S. Miller <davem@davemloft.net> | 2010-08-17 17:09:53 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-08-26 16:43:41 -0700 |
| commit | 1900a7a32a9988af9bb6ad21d66ddcb4a1bc3af4 (patch) | |
| tree | 848c5e408266bd980f4368abc558c3f16b6263f1 | |
| parent | d5241124077ee087eb809a94a950950daa82eebc (diff) | |
sparc64: Fix rwsem constant bug leading to hangs.
[ Upstream commit ef201bebe5afc91a2b99b45dacc8c6dd88ca9e58 ]
As noticed by Linus, it is critical that some of the
rwsem constants be signed. Yet, hex constants are
unsigned unless explicitly casted or negated.
The most critical one is RWSEM_WAITING_BIAS.
This bug was exacerbated by commit
424acaaeb3a3932d64a9b4bd59df6cf72c22d8f3 ("rwsem: wake queued readers
when writer blocks on active read lock")
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | arch/sparc/include/asm/rwsem-const.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/sparc/include/asm/rwsem-const.h b/arch/sparc/include/asm/rwsem-const.h index a303c9d64d8..e4c61a18bb2 100644 --- a/arch/sparc/include/asm/rwsem-const.h +++ b/arch/sparc/include/asm/rwsem-const.h @@ -5,7 +5,7 @@ #define RWSEM_UNLOCKED_VALUE 0x00000000 #define RWSEM_ACTIVE_BIAS 0x00000001 #define RWSEM_ACTIVE_MASK 0x0000ffff -#define RWSEM_WAITING_BIAS 0xffff0000 +#define RWSEM_WAITING_BIAS (-0x00010000) #define RWSEM_ACTIVE_READ_BIAS RWSEM_ACTIVE_BIAS #define RWSEM_ACTIVE_WRITE_BIAS (RWSEM_WAITING_BIAS + RWSEM_ACTIVE_BIAS) |