Josef Bacik 4a444b1f06 rwsem: add rwsem_is_contended ...

Btrfs needs a simple way to know if it needs to let go of it's read lock on a
rwsem.  Introduce rwsem_is_contended to check to see if there are any waiters on
this rwsem currently.  This is just a hueristic, it is meant to be light and not
100% accurate and called by somebody already holding on to the rwsem in either
read or write.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <clm@fb.com>
Acked-by: Ingo Molnar <mingo@kernel.org>

2014-01-28 13:20:09 -08:00

..

acpi

Merge branches 'acpi-pci-pm' and 'acpi-pci-hotplug'

2013-12-31 22:03:37 +01:00

asm-generic

mm: Fix NULL pointer dereference in madvise(MADV_WILLNEED) support

2013-12-20 12:17:03 -08:00

clocksource

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crypto

crypto: scatterwalk - Use sg_chain_ptr on chain entries

2013-12-09 19:58:52 +08:00

drm

drm/radeon: 0x9649 is SUMO2 not SUMO

2013-12-23 10:03:41 -05:00

dt-bindings

For the 3.13 merge window we have a couple of new drivers for the AMS

2013-11-15 16:37:40 -08:00

keys

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kvm

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linux

rwsem: add rwsem_is_contended

2014-01-28 13:20:09 -08:00

math-emu

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media

[media] videobuf2: Add support for file access mode flags for DMABUF exporting

2013-12-09 14:50:50 -02:00

memory

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misc

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net

ipv6: simplify detection of first operational link-local address on interface

2014-01-17 18:10:01 -08:00

pcmcia

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ras

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rdma

IB/core: const'ify inbuf in struct ib_udata

2013-12-16 10:38:28 -08:00

rxrpc

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scsi

[SCSI] Disable WRITE SAME for RAID and virtual host adapter drivers

2013-11-29 08:48:39 +04:00

sound

ALSA: memalloc.h - fix wrong truncation of dma_addr_t

2013-12-10 15:30:46 +01:00

target

target/file: Update hw_max_sectors based on current block_size

2013-12-19 00:18:54 -08:00

trace

Btrfs/tracepoint: update new flags for ordered extent TP

2014-01-28 13:19:38 -08:00

uapi

btrfs: add ioctl to export size of global metadata reservation

2014-01-28 13:19:28 -08:00

video

fbdev changes for 3.13

2013-11-14 14:44:20 +09:00

xen

Bug-fixes:

2013-12-20 09:34:54 -08:00

Kbuild

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