linux.git/arch/arc/include/asm/atomic.h, branch v4.11

ARC: [plat-eznps] Fix build error

2017-04-14T16:56:06+00:00

Make ATOMIC_INIT available for all ARC platforms (including plat-eznps)

Cc: 	# 4.9+
Signed-off-by: Noam Camus 
Signed-off-by: Vineet Gupta

ARC: [plat-eznps] add missing atomic_fetch_xxx operations

2016-09-30T21:48:18+00:00

Build brekeage since last changes to generic atomic operations.
Added couple of missing macros which are now mandatory

Signed-off-by: Noam Camus 
Signed-off-by: Vineet Gupta

ARCv2: Implement atomic64 based on LLOCKD/SCONDD instructions

2016-09-30T21:48:17+00:00

ARCv2 ISA provides 64-bit exclusive load/stores so use them to implement
the 64-bit atomics and elide the spinlock based generic 64-bit atomics

boot tested with atomic64 self-test (and GOD bless the person who wrote
them, I realized my inline assmebly is sloppy as hell)

Cc: Peter Zijlstra 
Cc: Will Deacon 
Cc: linux-snps-arc@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Vineet Gupta

locking/atomic, arch/arc: Fix build

2016-06-20T09:25:49+00:00

Resolve conflict between commits:

  fbffe892e525 ("locking/atomic, arch/arc: Implement atomic_fetch_{add,sub,and,andnot,or,xor}()")

and:

  ed6aefed726a ("Revert "ARCv2: spinlock/rwlock/atomics: Delayed retry of failed SCOND with exponential backoff"")

Reported-by: Guenter Roeck 
Signed-off-by: Peter Zijlstra (Intel) 
Cc: Linus Torvalds 
Cc: Nigel Topham 
Cc: Noam Camus 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Cc: Vineet Gupta 
Cc: linux-kernel@vger.kernel.org
Cc: linux-snps-arc@lists.infradead.org
Signed-off-by: Ingo Molnar

locking/atomic: Remove linux/atomic.h:atomic_fetch_or()

2016-06-16T08:48:32+00:00

Since all architectures have this implemented now natively, remove this
dead code.

Signed-off-by: Peter Zijlstra (Intel) 
Cc: Andrew Morton 
Cc: Linus Torvalds 
Cc: Paul E. McKenney 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Cc: linux-arch@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar

locking/atomic, arch/arc: Implement atomic_fetch_{add,sub,and,andnot,or,xor}()

2016-06-16T08:48:20+00:00

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).

Signed-off-by: Peter Zijlstra (Intel) 
Acked-by: Vineet Gupta 
Cc: Andrew Morton 
Cc: Linus Torvalds 
Cc: Noam Camus 
Cc: Paul E. McKenney 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Cc: linux-arch@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-snps-arc@lists.infradead.org
Signed-off-by: Ingo Molnar

Revert "ARCv2: spinlock/rwlock/atomics: Delayed retry of failed SCOND with exponential backoff"

2016-06-02T05:29:23+00:00

This reverts commit e78fdfef84be13a5c2b8276e12203cdf24778596.

The issue was fixed in hardware in HS2.1C release and there are no known
external users of affected RTL so revert the whole delayed retry series !

Signed-off-by: Vineet Gupta

Revert "ARCv2: spinlock/rwlock/atomics: reduce 1 instruction in exponential backoff"

2016-06-02T05:29:22+00:00

This reverts commit 10971638701dedadb58c88ce4d31c9375b224ed6.

The issue was fixed in hardware in HS2.1C release and there are no known
external users of affected RTL - so revert thw whole delayed retry
series !

Signed-off-by: Vineet Gupta

ARC: [plat-eznps] Use dedicated atomic/bitops/cmpxchg

2016-05-09T04:02:33+00:00

We need our own implementaions since we lack LLSC support.
Our extended ISA provided with optimized solution for all 32bit
operations we see in these three headers.
Signed-off-by: Noam Camus

atomic, arch: Audit atomic_{read,set}()

2015-09-23T07:54:28+00:00

This patch makes sure that atomic_{read,set}() are at least
{READ,WRITE}_ONCE().

We already had the 'requirement' that atomic_read() should use
ACCESS_ONCE(), and most archs had this, but a few were lacking.
All are now converted to use READ_ONCE().

And, by a symmetry and general paranoia argument, upgrade atomic_set()
to use WRITE_ONCE().

Signed-off-by: Peter Zijlstra (Intel) 
Cc: Andrew Morton 
Cc: Dmitry Vyukov 
Cc: Linus Torvalds 
Cc: Paul E. McKenney 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Cc: james.hogan@imgtec.com
Cc: linux-kernel@vger.kernel.org
Cc: oleg@redhat.com
Cc: will.deacon@arm.com
Signed-off-by: Ingo Molnar