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Davidlohr Bueso 00eb4bab69 locking/rwsem: Use acquire/release semantics 
As of 654672d4ba1 (locking/atomics: Add _{acquire|release|relaxed}()
variants of some atomic operations) and 6d79ef2d30e (locking, asm-generic:
Add _{relaxed|acquire|release}() variants for 'atomic_long_t'), weakly
ordered archs can benefit from more relaxed use of barriers when locking
and unlocking, instead of regular full barrier semantics. While currently
only arm64 supports such optimizations, updating corresponding locking
primitives serves for other archs to immediately benefit as well, once the
necessary machinery is implemented of course.

Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Paul E.McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will.deacon@arm.com>
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/1443643395-17016-6-git-send-email-dave@stgolabs.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-10-06 17:28:24 +02:00
..
bitops
arch: Mass conversion of smp_mb__*()
2014-04-18 14:20:48 +02:00
4level-fixup.h
mm, asm-generic: define PUD_SHIFT in <asm-generic/4level-fixup.h>
2015-02-11 17:06:03 -08:00
asm-offsets.h
asm-generic: Add common asm-offsets.h
2015-06-23 13:35:49 +09:00
atomic64.h
atomic: Provide atomic_{or,xor,and}
2015-07-27 14:06:24 +02:00
atomic-long.h
locking/asm-generic: Add _{relaxed|acquire|release}() variants for inc/dec atomics
2015-10-06 17:28:19 +02:00
atomic.h
atomic, arch: Audit atomic_{read,set}()
2015-09-23 09:54:28 +02:00
audit_change_attr.h
audit: Modify a set of system calls in audit class definitions
2014-01-17 17:01:46 -05:00
audit_dir_write.h
audit: support the "standard" <asm-generic/unistd.h>
2011-05-04 14:41:28 -04:00
audit_read.h
audit: support the "standard" <asm-generic/unistd.h>
2011-05-04 14:41:28 -04:00
audit_signal.h
…
audit_write.h
audit: Modify a set of system calls in audit class definitions
2014-01-17 17:01:46 -05:00
barrier.h
locking, arch: use WRITE_ONCE()/READ_ONCE() in smp_store_release()/smp_load_acquire()
2015-08-03 10:59:30 +02:00
bitops.h
arch: Prepare for smp_mb__{before,after}_atomic()
2014-04-18 11:40:30 +02:00
bitsperlong.h
UAPI: (Scripted) Disintegrate include/asm-generic
2012-10-04 18:20:15 +01:00
bug.h
bug: Make BUG() always stop the machine
2014-04-07 16:36:10 -07:00
bugs.h
…
cache.h
…
cacheflush.h
asm-generic/cacheflush.h: flush icache when copying to user pages
2011-05-25 08:39:37 -07:00
checksum.h
asm-generic headers: Allow yet more arch overrides in checksum.h
2013-02-11 20:00:33 +05:30
clkdev.h
asm-generic: COMMON_CLK defines __clk_{get,put}
2014-09-25 18:00:45 -07:00
cmpxchg-local.h
LLVMLinux: Remove warning about returning an uninitialized variable
2014-04-09 13:44:35 -07:00
cmpxchg.h
locking/rtmutex: Drop usage of __HAVE_ARCH_CMPXCHG
2015-05-13 10:51:28 +02:00
cputime_jiffies.h
sched, time: Fix build error with 64 bit cputime_t on 32 bit systems
2014-10-03 05:46:55 +02:00
cputime_nsecs.h
sched, time: Fix build error with 64 bit cputime_t on 32 bit systems
2014-10-03 05:46:55 +02:00
cputime.h
cputime: Generic on-demand virtual cputime accounting
2013-01-27 19:23:27 +01:00
current.h
…
delay.h
asm-generic: delay.h fix udelay and ndelay for 8 bit args
2011-07-22 18:45:33 +02:00
device.h
…
div64.h
…
dma-coherent.h
DMA-API: Change dma_declare_coherent_memory() CPU address to phys_addr_t
2014-05-20 16:55:23 -06:00
dma-contiguous.h
asm-generic: Add dma-contiguous.h
2014-09-22 13:35:51 +02:00
dma-mapping-broken.h
asm-generic/dma-mapping-broken.h: Provide dma_alloc_attrs()/dma_free_attrs()
2012-12-25 20:14:54 +01:00
dma-mapping-common.h
dma-mapping: consolidate dma_set_mask
2015-09-10 13:29:01 -07:00
dma.h
…
early_ioremap.h
Merge branch 'akpm' (patches from Andrew)
2015-09-08 17:52:23 -07:00
emergency-restart.h
…
exec.h
Split arch_align_stack() out from asm-generic/system.h
2012-03-28 18:30:03 +01:00
fb.h
…
fixmap.h
mm: provide early_memremap_ro to establish read-only mapping
2015-08-20 12:24:22 +01:00
ftrace.h
asm-generic headers: add ftrace.h
2011-03-17 09:19:04 +08:00
futex.h
sched/preempt, futex: Disable preemption in UP futex_atomic_cmpxchg_inatomic() explicitly
2015-05-19 08:39:16 +02:00
getorder.h
bitops: Add missing parentheses to new get_order macro
2012-02-24 10:39:27 -08:00
gpio.h
gpio: remove gpiod_sysfs_set_active_low
2015-05-12 10:46:53 +02:00
hardirq.h
Fix IRQ flag handling naming
2010-10-07 14:08:55 +01:00
hugetlb.h
mm: Fix generic hugetlb pte check return type.
2013-10-02 20:02:35 -04:00
hw_irq.h
…
ide_iops.h
…
int-ll64.h
UAPI: (Scripted) Disintegrate include/asm-generic
2012-10-04 18:20:15 +01:00
io-64-nonatomic-hi-lo.h
readq/writeq: Add explicit lo_hi_[read|write]_q and hi_lo_[read|write]_q
2014-07-04 13:27:30 +02:00
io-64-nonatomic-lo-hi.h
readq/writeq: Add explicit lo_hi_[read|write]_q and hi_lo_[read|write]_q
2014-07-04 13:27:30 +02:00
io.h
x86/mm, asm-generic: Add IOMMU ioremap_uc() variant default
2015-07-21 10:47:03 +02:00
ioctl.h
include/asm-generic/ioctl.h: fix _IOC_TYPECHECK sparse error
2014-06-06 16:08:13 -07:00
iomap.h
x86/mm, asm-generic: Add ioremap_wt() for creating Write-Through mappings
2015-06-07 15:28:56 +02:00
irq_regs.h
core: Replace __get_cpu_var with __this_cpu_read if not used for an address.
2010-12-17 15:07:19 +01:00
irq_work.h
irq_work: Introduce arch_irq_work_has_interrupt()
2014-09-13 18:38:07 +02:00
irq.h
…
irqflags.h
Fix IRQ flag handling naming
2010-10-07 14:08:55 +01:00
Kbuild.asm
UAPI: Set up uapi/asm/Kbuild.asm
2012-10-02 18:01:56 +01:00
kdebug.h
asm-generic: kdebug.h: Checkpatch cleanup
2010-10-09 21:51:44 +02:00
kmap_types.h
asm-generic: remove km_type definitions
2012-07-24 15:27:30 +08:00
kvm_para.h
KVM: add kvm_para_available to asm-generic/kvm_para.h
2013-06-05 13:21:29 +03:00
libata-portmap.h
…
linkage.h
…
local64.h
atomic: use <linux/atomic.h>
2011-07-26 16:49:47 -07:00
local.h
atomic: use <linux/atomic.h>
2011-07-26 16:49:47 -07:00
mcs_spinlock.h
locking/mcs: Allow architecture specific asm files to be used for contended case
2014-02-09 21:18:52 +01:00
memory_model.h
mm: fix type cast in __pfn_to_phys()
2015-09-19 03:58:10 -04:00
mm_hooks.h
mm: Make arch_unmap()/bprm_mm_init() available to all architectures
2014-11-19 11:54:13 +01:00
mm-arch-hooks.h
mm: clean up per architecture MM hook header files
2015-07-17 16:39:53 -07:00
mmu_context.h
asm-generic: Remove asm-generic arch_bprm_mm_init()
2014-11-22 21:52:08 +01:00
mmu.h
asm-generic/mmu.h: Add support for FDPIC
2012-12-09 23:14:14 +01:00
module.h
Make most arch asm/module.h files use asm-generic/module.h
2012-09-28 14:31:03 +09:30
msi.h
asm-generic: Add msi.h
2014-11-23 13:01:47 +01:00
mutex-dec.h
locking/mutex: Use acquire/release semantics
2015-10-06 17:28:20 +02:00
mutex-null.h
arch: Make __mutex_fastpath_lock_retval return whether fastpath succeeded or not
2013-06-26 12:10:55 +02:00
mutex-xchg.h
locking/mutex: Use acquire/release semantics
2015-10-06 17:28:20 +02:00
mutex.h
…
page.h
The following changes since commit 3ee72ca99288f1de95ec9c570e43f531c8799f06
2012-01-10 17:39:40 -08:00
param.h
UAPI: (Scripted) Disintegrate include/asm-generic
2012-10-04 18:20:15 +01:00
parport.h
include: remove __dev* attributes.
2013-01-03 15:57:16 -08:00
pci_iomap.h
PCI: Add pci_iomap_wc() variants
2015-08-25 09:59:45 +02:00
pci-bridge.h
PCI: work around Stratus ftServer broken PCIe hierarchy
2012-04-30 15:21:02 -06:00
pci-dma-compat.h
pci-dma-compat: add pci_zalloc_consistent helper
2014-08-08 15:57:28 -07:00
pci.h
PCI: Remove unused pcibios_select_root() (again)
2015-06-08 07:56:21 -05:00
percpu.h
percpu: preffity percpu header files
2014-06-17 19:12:40 -04:00
pgalloc.h
…
pgtable-nopmd.h
…
pgtable-nopud.h
…
pgtable.h
mm: clarify that the function operates on hugepage pte
2015-06-24 17:49:44 -07:00
preempt.h
sched/preempt: Fix cond_resched_lock() and cond_resched_softirq()
2015-08-03 12:21:24 +02:00
ptrace.h
asm-generic/ptrace.h: start a common low level ptrace helper
2011-05-26 17:12:36 -07:00
qrwlock_types.h
locking/qrwlock: Rename ->lock to ->wait_lock
2015-09-18 09:27:29 +02:00
qrwlock.h
locking/qrwlock: Make use of _{acquire|release|relaxed}() atomics
2015-08-12 11:59:06 +02:00
qspinlock_types.h
locking/qspinlock: Optimize for smaller NR_CPUS
2015-05-08 12:36:48 +02:00
qspinlock.h
locking/qspinlock/x86: Fix performance regression under unaccelerated VMs
2015-09-11 07:49:42 +02:00
resource.h
asm-generic: remove _STK_LIM_MAX
2014-05-15 00:32:09 +01:00
rtc.h
rtc: cmos: century support
2015-09-05 13:19:09 +02:00
rwsem.h
locking/rwsem: Use acquire/release semantics
2015-10-06 17:28:24 +02:00
seccomp.h
seccomp: allow COMPAT sigreturn overrides
2015-04-17 09:04:09 -04:00
sections.h
nosave: consolidate __nosave_{begin,end} in <asm/sections.h>
2014-10-09 22:26:04 -04:00
segment.h
…
serial.h
…
siginfo.h
constify copy_siginfo_to_user{,32}()
2013-11-09 00:16:29 -05:00
signal.h
unify default ptrace_signal_deliver
2012-11-29 00:01:23 -05:00
simd.h
crypto: create generic version of ablk_helper
2013-09-24 06:02:24 +10:00
sizes.h
ARM: 7430/1: sizes.h: move from asm-generic to <linux/sizes.h>
2012-06-28 17:14:34 +01:00
spinlock.h
…
statfs.h
UAPI: (Scripted) Disintegrate include/asm-generic
2012-10-04 18:20:15 +01:00
string.h
…
switch_to.h
Split the switch_to() wrapper out of asm-generic/system.h
2012-03-28 18:30:03 +01:00
syscall.h
syscall.h: fix doc text for syscall_get_arch()
2014-09-23 16:20:00 -04:00
syscalls.h
burying unused conditionals
2013-02-14 09:21:15 -05:00
termios-base.h
…
termios.h
UAPI: (Scripted) Disintegrate include/asm-generic
2012-10-04 18:20:15 +01:00
timex.h
…
tlb.h
mm: mmu_gather: use tlb->end != 0 only for TLB invalidation
2015-01-13 15:20:40 +13:00
tlbflush.h
BUG: headers with BUG/BUG_ON etc. need linux/bug.h
2012-03-04 17:54:34 -05:00
topology.h
topology: alternate fix for ia64 tiger_defconfig build breakage
2010-08-09 20:44:57 -07:00
trace_clock.h
tracing,x86: Add a TSC trace_clock
2012-11-13 15:48:27 -05:00
uaccess-unaligned.h
…
uaccess.h
asm-generic: uaccess: Spelling s/a ny/any/
2014-01-02 10:45:23 +01:00
unaligned.h
asm-generic: allow generic unaligned access if the arch supports it
2014-05-08 10:22:23 +02:00
unistd.h
We get rid of the general module prefix confusion with a binary config option,
2013-05-05 10:58:06 -07:00
user.h
asm-generic/user.h: Fix spelling in comment
2011-03-01 15:49:39 +01:00
vga.h
…
vmlinux.lds.h
kbuild: Fix .text.unlikely placement
2015-08-20 14:55:54 +02:00
vtime.h
include/asm-generic/vtime.h: avoid zero-length file
2013-09-30 14:31:02 -07:00
word-at-a-time.h
Make asm/word-at-a-time.h available on all architectures
2015-07-08 16:41:55 -04:00
xor.h
asm-generic: xor: mark static functions as __maybe_unused
2012-10-03 21:21:06 +02:00