linux-stable.git/arch/arc/include/asm/atomic.h, branch linux-4.1.y Linux kernel stable tree ARC: add smp barriers around atomics per Documentation/atomic_ops.txt 2015-07-21T17:10:02+00:00 Vineet Gupta vgupta@synopsys.com 2014-11-20T10:12:09+00:00 eb1eecd100ce48d4f8368a0c475ecb937abd40ec commit 2576c28e3f623ed401db7e6197241865328620ef upstream. - arch_spin_lock/unlock were lacking the ACQUIRE/RELEASE barriers Since ARCv2 only provides load/load, store/store and all/all, we need the full barrier - LLOCK/SCOND based atomics, bitops, cmpxchg, which return modified values were lacking the explicit smp barriers. - Non LLOCK/SCOND varaints don't need the explicit barriers since that is implicity provided by the spin locks used to implement the critical section (the spin lock barriers in turn are also fixed in this commit as explained above Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 
commit 2576c28e3f623ed401db7e6197241865328620ef upstream.

 - arch_spin_lock/unlock were lacking the ACQUIRE/RELEASE barriers
   Since ARCv2 only provides load/load, store/store and all/all, we need
   the full barrier

 - LLOCK/SCOND based atomics, bitops, cmpxchg, which return modified
   values were lacking the explicit smp barriers.

 - Non LLOCK/SCOND varaints don't need the explicit barriers since that
   is implicity provided by the spin locks used to implement the
   critical section (the spin lock barriers in turn are also fixed in
   this commit as explained above

Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
ARC: unbork !LLSC build 2015-05-10T06:36:57+00:00 Vineet Gupta vgupta@synopsys.com 2015-05-10T06:34:01+00:00 daaf40e53b5dbdf75255d58a45ce8ac65ca511a8 Fixes: f7d11e93ee97a locking,arch,arc: Fold atomic_ops Cc: <stable@kernel.vger.org> # 3.18 Signed-off-by: Vineet Gupta <vgupta@synopsys.com> 
Fixes: f7d11e93ee97a locking,arch,arc: Fold atomic_ops
Cc: <stable@kernel.vger.org> # 3.18
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Merge tag 'arc-3.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc 2014-10-21T14:50:02+00:00 Linus Torvalds torvalds@linux-foundation.org 2014-10-21T14:50:02+00:00 3d430bdb74140224d90dd6253d67ff71d181cf64 Pull ARC updates from Vineet Gupta: "Sorry for the late pull request. Current stuff was ready for a while but I was hoping to squeeze in support for almost ready ARC SDP platform (and avoid a 2nd pull request), however it seems there are still some loose ends which warrant more time. - Platform code reduction/moving-up (TB10X no longer needs any callbacks) - updated boot printing - kgdb update for arc gdb 7.5 - bug fixes (some marked for stable) - more code refactoring/consolidation" * tag 'arc-3.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc: ARC: boot: cpu feature print enhancements ARC: boot: consolidate cross-checking of h/w and s/w ARC: unbork FPU save/restore ARC: remove extraneous __KERNEL__ guards ARC: Update order of registers in KGDB to match GDB 7.5 ARC: Remove unneeded Kconfig entry NO_DMA ARC: BUG() dumps stack after @msg (@msg now same as in generic BUG)) ARC: refactoring: reduce the scope of some local vars ARC: remove gcc mpy heuristics ARC: RIP @running_on_hw ARC: Update comments about uncached address space ARC: rename kconfig option for unaligned emulation ARC: [nsimosci] Allow "headless" models to boot ARC: [arcfpga] Get rid of ARC_BOARD_ANGEL4 and ARC_BOARD_ML509 ARC: [arcfpga] Remove more dead code ARC: [plat*] move code out of .init_machine into common ARC: [arcfpga] consolidate machine description, DT ARC: Allow SMP kernel to build/boot on UP-only infrastructure 
Pull ARC updates from Vineet Gupta:
 "Sorry for the late pull request.  Current stuff was ready for a while
  but I was hoping to squeeze in support for almost ready ARC SDP
  platform (and avoid a 2nd pull request), however it seems there are
  still some loose ends which warrant more time.

   - Platform code reduction/moving-up (TB10X no longer needs any
     callbacks)
   - updated boot printing
   - kgdb update for arc gdb 7.5
   - bug fixes (some marked for stable)
   - more code refactoring/consolidation"

* tag 'arc-3.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc:
  ARC: boot: cpu feature print enhancements
  ARC: boot: consolidate cross-checking of h/w and s/w
  ARC: unbork FPU save/restore
  ARC: remove extraneous __KERNEL__ guards
  ARC: Update order of registers in KGDB to match GDB 7.5
  ARC: Remove unneeded Kconfig entry NO_DMA
  ARC: BUG() dumps stack after @msg (@msg now same as in generic BUG))
  ARC: refactoring: reduce the scope of some local vars
  ARC: remove gcc mpy heuristics
  ARC: RIP @running_on_hw
  ARC: Update comments about uncached address space
  ARC: rename kconfig option for unaligned emulation
  ARC: [nsimosci] Allow "headless" models to boot
  ARC: [arcfpga] Get rid of ARC_BOARD_ANGEL4 and ARC_BOARD_ML509
  ARC: [arcfpga] Remove more dead code
  ARC: [plat*] move code out of .init_machine into common
  ARC: [arcfpga] consolidate machine description, DT
  ARC: Allow SMP kernel to build/boot on UP-only infrastructure
ARC: remove extraneous __KERNEL__ guards 2014-10-13T09:16:20+00:00 Vineet Gupta vgupta@synopsys.com 2014-09-27T07:19:11+00:00 be64c997d96dd29029ed40d9df9cbf80fa1c7ed4 Verified by doing make headers_install as none of these files are exported to userspace 
Verified by doing make headers_install as none of these files are
exported to userspace
locking,arch,arc: Fold atomic_ops 2014-08-14T10:48:03+00:00 Peter Zijlstra peterz@infradead.org 2014-03-23T15:29:31+00:00 f7d11e93ee97a37da1947b7c4e1794705a6f360c Many of the atomic op implementations are the same except for one instruction; fold the lot into a few CPP macros and reduce LoC. This also prepares for easy addition of new ops. Signed-off-by: Peter Zijlstra <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Vineet Gupta <vgupta@synopsys.com> Link: http://lkml.kernel.org/r/20140508135851.886055622@infradead.org Signed-off-by: Ingo Molnar <mingo@kernel.org> 
Many of the atomic op implementations are the same except for one
instruction; fold the lot into a few CPP macros and reduce LoC.

This also prepares for easy addition of new ops.

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Vineet Gupta <vgupta@synopsys.com>
Link: http://lkml.kernel.org/r/20140508135851.886055622@infradead.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch,arc: Convert smp_mb__*() 2014-04-18T09:40:31+00:00 Peter Zijlstra peterz@infradead.org 2014-03-12T16:11:00+00:00 d594ffa94b7efdd8c6da5ee48aea8ae229809b55 The arc mb() implementation is a compiler barrier(), therefore it all doesn't matter one way or the other. Simply remove the existing definitions and use whatever is generated by the defaults. Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Link: http://lkml.kernel.org/n/tip-ua48a59wri3ybz1rz8i7uvbr@git.kernel.org Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org> 
The arc mb() implementation is a compiler barrier(), therefore it all
doesn't matter one way or the other. Simply remove the existing
definitions and use whatever is generated by the defaults.

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/n/tip-ua48a59wri3ybz1rz8i7uvbr@git.kernel.org
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch: Move smp_mb__{before,after}_atomic_{inc,dec}.h into asm/atomic.h 2014-01-12T09:37:14+00:00 Peter Zijlstra peterz@infradead.org 2013-11-08T11:01:59+00:00 1de7da377bd880ff23917f78924d0e908329d978 Move the barriers functions that depend on the atomic implementation into the atomic implementation. Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Vineet Gupta <vgupta@synopsys.com> [for arch/arc bits] Cc: Peter Zijlstra <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Link: http://lkml.kernel.org/r/20131213150640.786183683@infradead.org Signed-off-by: Ingo Molnar <mingo@kernel.org> 
Move the barriers functions that depend on the atomic implementation
into the atomic implementation.

Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Vineet Gupta <vgupta@synopsys.com> [for arch/arc bits]
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/r/20131213150640.786183683@infradead.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
ARC: Atomic/bitops/cmpxchg/barriers 2013-02-11T14:30:30+00:00 Vineet Gupta vgupta@synopsys.com 2013-01-18T09:42:16+00:00 14e968bad788de922a755a84b92cb29f8c1342e4 This covers the UP / SMP (with no hardware assist for atomic r-m-w) as well as ARC700 LLOCK/SCOND insns based. Signed-off-by: Vineet Gupta <vgupta@synopsys.com> 
This covers the UP / SMP (with no hardware assist for atomic r-m-w) as
well as ARC700 LLOCK/SCOND insns based.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>