[RFC][PATCH 0/7] locking/rwsem: Convert rwsem count to atomic_long_t

[Jason Low]

The first patch contains an optimization for acquiring the rwsem write lock
in the slowpath.

This rest of the series converts the rwsem count variable to an atomic_long_t
since it is used it as an atomic variable. This allows us to also remove
the rwsem_atomic_{add,update} abstraction and reduce 100+ lines of code.

 arch/alpha/include/asm/rwsem.h | 42 --------------------------------
 arch/ia64/include/asm/rwsem.h  |  7 ------
 arch/s390/include/asm/rwsem.h  | 37 -----------------------------
 arch/x86/include/asm/rwsem.h   | 18 --------------
 include/asm-generic/rwsem.h    | 16 -------------
 include/linux/rwsem.h          |  6 ++---
 kernel/locking/rwsem-xadd.c    | 54 ++++++++++++++++++++++++++----------------
 7 files changed, 36 insertions(+), 144 deletions(-)

-- 
2.1.4