Will Deacon
4df714be4d
locking/atomic: Add atomic_cond_read_acquire() ...
smp_cond_load_acquire() provides a way to spin on a variable with acquire
semantics until some conditional expression involving the variable is
satisfied. Architectures such as arm64 can potentially enter a low-power
state, waking up only when the value of the variable changes, which
reduces the system impact of tight polling loops.
This patch makes the same interface available to users of atomic_t,
atomic64_t and atomic_long_t, rather than require messy accesses to the
structure internals.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Jeremy.Linton@arm.com
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Waiman Long <longman@redhat.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/1507810851-306-3-git-send-email-will.deacon@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-10-25 10:57:24 +02:00
bitops: Do not default to __clear_bit() for __clear_bit_unlock()
2016-03-21 10:50:48 +01:00
asm-generic: introduce 5level-fixup.h
2017-03-09 11:48:47 -08:00
asm-generic: introduce 5level-fixup.h
2017-03-09 11:48:47 -08:00
asm-generic: Add common asm-offsets.h
2015-06-23 13:35:49 +09:00
asm-prototypes: Clear any CPP defines before declaring the functions
2017-01-05 12:57:42 +01:00
locking/atomic: Add atomic_cond_read_acquire()
2017-10-25 10:57:24 +02:00
openrisc: add optimized atomic operations
2017-02-25 04:14:06 +09:00
locking/atomic: Fix atomic_set_release() for 'funny' architectures
2017-08-10 12:28:54 +02:00
locking/spinlock, arch: Update and fix spin_unlock_wait() implementations
2016-06-14 11:55:15 +02:00
asm-generic/bug.h: declare struct pt_regs; before function prototype
2017-07-10 16:32:34 -07:00
ipv4: Update parameters for csum_tcpudp_magic to their original types
2016-03-13 23:55:13 -04:00
asm-generic: cmpxchg: avoid warnings from macro-ized cmpxchg() implementations
2015-10-15 00:21:13 +02:00
__div64_32(): make it overridable at compile time
2015-11-16 14:42:12 -05:00
x86/mm: Extend early_memremap() support with additional attrs
2017-07-18 11:38:00 +02:00
modversions: treat symbol CRCs as 32 bit quantities
2017-02-03 08:28:25 -08:00
add asm-generic/extable.h
2017-03-27 20:27:28 -04:00
asm-generic: Fix local variable shadow in __set_fixmap_offset
2016-02-16 15:10:44 +00:00
futex: Remove duplicated code and fix undefined behaviour
2017-08-25 22:49:59 +02:00
gpio: allow setting ARCH_NR_GPIOS from Kconfig
2016-02-19 00:22:54 +01:00
mm/hugetlb: allow architectures to override huge_pte_clear()
2017-07-06 16:24:34 -07:00
x86/io: Remove xlate_dev_kmem_ptr() duplication
2017-07-24 11:18:21 +02:00
asm-generic/io.h: add io{read,write}64 accessors
2016-05-31 16:41:50 +08:00
kprobes: move kprobe declarations to asm-generic/kprobes.h
2017-02-27 18:43:45 -08:00
mm: add PHYS_PFN, use it in __phys_to_pfn()
2016-01-14 16:00:49 -08:00
mm: clean up per architecture MM hook header files
2015-07-17 16:39:53 -07:00
mm/gup: Drop the arch_pte_access_permitted() MMU callback
2017-03-18 09:48:01 +01:00
asm-generic: page.h: Remove useless get_user_page and free_user_page
2016-02-26 15:24:55 +01:00
PCI: Remove unused pcibios_select_root() (again)
2015-06-08 07:56:21 -05:00
PCI: Add pci_iomap_wc() variants
2015-08-25 09:59:45 +02:00
percpu: make this_cpu_generic_read() atomic w.r.t. interrupts
2017-09-26 07:37:33 -07:00
asm-generic: introduce __ARCH_USE_5LEVEL_HACK
2017-03-09 11:48:47 -08:00
asm-generic: introduce <asm-generic/pgtable-nop4d.h>
2017-03-09 11:48:47 -08:00
asm-generic: introduce <asm-generic/pgtable-nop4d.h>
2017-03-09 11:48:47 -08:00
mm: soft-dirty: keep soft-dirty bits over thp migration
2017-09-08 18:26:45 -07:00
sched/preempt: Fix preempt_count manipulations
2016-05-17 12:24:21 +02:00
locking/qrwlock: Use 'struct qrwlock' instead of 'struct __qrwlock'
2017-10-25 10:57:24 +02:00
locking/qrwlock: Use 'struct qrwlock' instead of 'struct __qrwlock'
2017-10-25 10:57:24 +02:00
locking/arch: Remove dummy arch_{read,spin,write}_lock_flags() implementations
2017-10-10 11:50:19 +02:00
locking/qspinlock: Move __ARCH_SPIN_LOCK_UNLOCKED to qspinlock_types.h
2016-02-29 10:02:43 +01:00
locking/rwsem: Add down_read_killable()
2017-10-10 11:50:16 +02:00
seccomp: Get compat syscalls from asm-generic header
2016-05-13 14:02:00 +02:00
irq: Make the irqentry text section unconditional
2017-08-10 16:28:53 +02:00
treewide: move set_memory_* functions away from cacheflush.h
2017-05-08 17:15:13 -07:00
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
mm: fix MADV_[FREE|DONTNEED] TLB flush miss problem
2017-08-10 15:54:07 -07:00
cpumask: fix spurious cpumask_of_node() on non-NUMA multi-node configs
2017-08-28 16:13:16 -07:00
fix the __user misannotations in asm-generic get_user/put_user
2017-09-04 12:07:24 -04:00
locking/refcounts, x86/asm: Use unique .text section for refcount exceptions
2017-09-28 09:45:05 +02:00
Make asm/word-at-a-time.h available on all architectures
2015-07-08 16:41:55 -04:00
4df714be4d