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locking/atomic, arch/arm64: Implement atomic{,64}_fetch_{add,sub,and,andnot,or,xor}{,_relaxed,_acquire,_release}()

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Implement FETCH-OP atomic primitives, these are very similar to the
existing OP-RETURN primitives we already have, except they return the
value of the atomic variable _before_ modification.

This is especially useful for irreversible operations -- such as
bitops (because it becomes impossible to reconstruct the state prior
to modification).

[wildea01: compile fixes for ll/sc]
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steve Capper <steve.capper@arm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will.deacon@arm.com>
Cc: linux-arch@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra
2016-04-18 01:16:09 +02:00
committed by Ingo Molnar
parent 6da068c1be
commit e490f9b1d3
2 changed files with 150 additions and 26 deletions
Download Patch File Download Diff File Expand all files Collapse all files

62
arch/arm64/include/asm/atomic.h
View File

@@ -76,6 +76,36 @@
#define atomic_dec_return_release(v) atomic_sub_return_release(1, (v))
#define atomic_dec_return(v) atomic_sub_return(1, (v))
#define atomic_fetch_add_relaxed atomic_fetch_add_relaxed
#define atomic_fetch_add_acquire atomic_fetch_add_acquire
#define atomic_fetch_add_release atomic_fetch_add_release
#define atomic_fetch_add atomic_fetch_add
#define atomic_fetch_sub_relaxed atomic_fetch_sub_relaxed
#define atomic_fetch_sub_acquire atomic_fetch_sub_acquire
#define atomic_fetch_sub_release atomic_fetch_sub_release
#define atomic_fetch_sub atomic_fetch_sub
#define atomic_fetch_and_relaxed atomic_fetch_and_relaxed
#define atomic_fetch_and_acquire atomic_fetch_and_acquire
#define atomic_fetch_and_release atomic_fetch_and_release
#define atomic_fetch_and atomic_fetch_and
#define atomic_fetch_andnot_relaxed atomic_fetch_andnot_relaxed
#define atomic_fetch_andnot_acquire atomic_fetch_andnot_acquire
#define atomic_fetch_andnot_release atomic_fetch_andnot_release
#define atomic_fetch_andnot atomic_fetch_andnot
#define atomic_fetch_or_relaxed atomic_fetch_or_relaxed
#define atomic_fetch_or_acquire atomic_fetch_or_acquire
#define atomic_fetch_or_release atomic_fetch_or_release
#define atomic_fetch_or atomic_fetch_or
#define atomic_fetch_xor_relaxed atomic_fetch_xor_relaxed
#define atomic_fetch_xor_acquire atomic_fetch_xor_acquire
#define atomic_fetch_xor_release atomic_fetch_xor_release
#define atomic_fetch_xor atomic_fetch_xor
#define atomic_xchg_relaxed(v, new) xchg_relaxed(&((v)->counter), (new))
#define atomic_xchg_acquire(v, new) xchg_acquire(&((v)->counter), (new))
#define atomic_xchg_release(v, new) xchg_release(&((v)->counter), (new))
@@ -98,6 +128,8 @@
#define __atomic_add_unless(v, a, u) ___atomic_add_unless(v, a, u,)
#define atomic_andnot atomic_andnot
#define atomic_fetch_or atomic_fetch_or
/*
* 64-bit atomic operations.
*/
@@ -125,6 +157,36 @@
#define atomic64_dec_return_release(v) atomic64_sub_return_release(1, (v))
#define atomic64_dec_return(v) atomic64_sub_return(1, (v))
#define atomic64_fetch_add_relaxed atomic64_fetch_add_relaxed
#define atomic64_fetch_add_acquire atomic64_fetch_add_acquire
#define atomic64_fetch_add_release atomic64_fetch_add_release
#define atomic64_fetch_add atomic64_fetch_add
#define atomic64_fetch_sub_relaxed atomic64_fetch_sub_relaxed
#define atomic64_fetch_sub_acquire atomic64_fetch_sub_acquire
#define atomic64_fetch_sub_release atomic64_fetch_sub_release
#define atomic64_fetch_sub atomic64_fetch_sub
#define atomic64_fetch_and_relaxed atomic64_fetch_and_relaxed
#define atomic64_fetch_and_acquire atomic64_fetch_and_acquire
#define atomic64_fetch_and_release atomic64_fetch_and_release
#define atomic64_fetch_and atomic64_fetch_and
#define atomic64_fetch_andnot_relaxed atomic64_fetch_andnot_relaxed
#define atomic64_fetch_andnot_acquire atomic64_fetch_andnot_acquire
#define atomic64_fetch_andnot_release atomic64_fetch_andnot_release
#define atomic64_fetch_andnot atomic64_fetch_andnot
#define atomic64_fetch_or_relaxed atomic64_fetch_or_relaxed
#define atomic64_fetch_or_acquire atomic64_fetch_or_acquire
#define atomic64_fetch_or_release atomic64_fetch_or_release
#define atomic64_fetch_or atomic64_fetch_or
#define atomic64_fetch_xor_relaxed atomic64_fetch_xor_relaxed
#define atomic64_fetch_xor_acquire atomic64_fetch_xor_acquire
#define atomic64_fetch_xor_release atomic64_fetch_xor_release
#define atomic64_fetch_xor atomic64_fetch_xor
#define atomic64_xchg_relaxed atomic_xchg_relaxed
#define atomic64_xchg_acquire atomic_xchg_acquire
#define atomic64_xchg_release atomic_xchg_release