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From: Michel Lespinasse on 24 May 2010 16:40
This is version 4 of my rwsem changes.

Changes since V3:

- Split first x86 rwsem change in two smaller parts
- Added David's rwsem_waiter_type enum suggestion into
'rwsem: down_read_critical infrastructure support'
- Lots of minor style fixes and comments clarified

I would hope the entire series can be considered for inclusion;
however if we can not agree on the down_read_critical() bits I would
still like patches 1-7 to be independently considered as I think they
still have merit on their own.

Michel Lespinasse (11):
x86 rwsem: stay on fast path when count>0 in __up_write()
x86 rwsem: minor cleanups
rwsem: fully separate code pathes to wake writers vs readers
rwsem: lighter active count checks when waking up readers
rwsem: let RWSEM_WAITING_BIAS represent any number of waiting threads
rwsem: wake queued readers when writer blocks on active read lock
rwsem: smaller wrappers around rwsem_down_failed_common
generic rwsem: implement down_read_critical() / up_read_critical()
rwsem: down_read_critical infrastructure support
x86 rwsem: down_read_critical implementation
Use down_read_critical() for /proc/<pid>/exe and /proc/<pid>/maps files

arch/x86/include/asm/rwsem.h | 73 +++++++++++------
arch/x86/lib/rwsem_64.S | 14 +++-
arch/x86/lib/semaphore_32.S | 21 ++++-
fs/proc/base.c | 4 +-
fs/proc/task_mmu.c | 24 ++++--
include/linux/proc_fs.h | 1 +
include/linux/rwsem-spinlock.h | 10 ++-
include/linux/rwsem.h | 12 +++
kernel/rwsem.c | 35 ++++++++
lib/rwsem-spinlock.c | 10 ++-
lib/rwsem.c | 178 +++++++++++++++++++++++++---------------
11 files changed, 276 insertions(+), 106 deletions(-)
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