linux-stable.git/arch/arc/kernel/smp.c, branch linux-4.1.y Linux kernel stable tree ARC: use ACCESS_ONCE in cmpxchg loop 2015-02-02T11:38:37+00:00 Vineet Gupta vgupta@synopsys.com 2014-12-15T13:12:24+00:00 7082a29c22ac0ab276b346f2a5c1d24a2102f158 Signed-off-by: Vineet Gupta <vgupta@synopsys.com> 
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
ARC: R-M-W assist locks only needed for !LLSC 2014-12-12T10:32:34+00:00 Vineet Gupta vgupta@synopsys.com 2014-11-07T13:21:22+00:00 9fb92eb1160d7e967f233cdfe2b718acff325b6e Signed-off-by: Vineet Gupta <vgupta@synopsys.com> 
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
ARC: Allow SMP kernel to build/boot on UP-only infrastructure 2014-09-27T09:19:01+00:00 Vineet Gupta vgupta@synopsys.com 2014-09-04T05:27:33+00:00 619f30188ff0d10fccc3cd952a79cb56ff62db54 In light of recent SNAFU with SMP build, allow simple platform to build as SMP but run UP. * Remove the dependence on simulation SMP extension to enable quick build/test iterations of SMP kernel. * In absence of platform SMP registration, prevent the NULL smp feature name from borkign the system Signed-off-by: Vineet Gupta <vgupta@synopsys.com> 
In light of recent SNAFU with SMP build, allow simple platform to build
as SMP but run UP.

* Remove the dependence on simulation SMP extension to enable quick
  build/test iterations of SMP kernel.

* In absence of platform SMP registration, prevent the NULL smp feature
  name from borkign the system

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
ARC: prune extra header includes from smp.c 2014-07-23T05:47:51+00:00 Vineet Gupta vgupta@synopsys.com 2014-06-12T17:18:59+00:00 c16e3e22839a33e1485b950ff7e86e58a862adea Signed-off-by: Vineet Gupta <vgupta@synopsys.com> 
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
ARC: [SMP] unify cpu private IRQ requests (TIMER/IPI) 2014-07-23T05:46:45+00:00 Vineet Gupta vgupta@synopsys.com 2014-05-07T09:55:10+00:00 2b75c0f93e395aa6130c20a08016b143e6ec8c53 The current cpu-private IRQ registration is ugly as it requires need to expose arch_unmask_irq() outside of intc code. So switch to percpu IRQ APIs: -request_percpu_irq [boot core] -enable_percpu_irq [all cores] Encapsulated in helper arc_request_percpu_irq() Signed-off-by: Vineet Gupta <vgupta@synopsys.com> 
The current cpu-private IRQ registration is ugly as it requires need to
expose arch_unmask_irq() outside of intc code.
So switch to percpu IRQ APIs:
  -request_percpu_irq [boot core]
  -enable_percpu_irq  [all cores]

Encapsulated in helper arc_request_percpu_irq()

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
ARC: [SMP] Fix IPI IRQ registration 2014-06-26T06:28:25+00:00 Noam Camus noamc@ezchip.com 2013-02-28T09:07:06+00:00 7e5122190b47c2574eda26aa0bbda693b2821449 Handle it just like timer. Current request_percpu_irq() would fail on non-boot cpus and thus IRQ will remian unmasked on those cpus. [vgupta: fix changelong] Signed-off-by: Noam Camus <noamc@ezchip.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com> 
Handle it just like timer. Current request_percpu_irq() would fail on
non-boot cpus and thus IRQ will remian unmasked on those cpus.

[vgupta: fix changelong]
Signed-off-by: Noam Camus <noamc@ezchip.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
ARC: arc_local_timer_setup() need not pass own cpu id 2014-06-03T07:56:52+00:00 Vineet Gupta vgupta@synopsys.com 2014-05-08T08:36:38+00:00 2d4899f6bddfbeb88c01f2ec28f977e0d8c8d369 Signed-off-by: Vineet Gupta <vgupta@synopsys.com> 
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
ARC: [SMP] optimize IPI send and receive 2013-12-23T06:35:04+00:00 Vineet Gupta vgupta@synopsys.com 2013-11-28T08:27:54+00:00 d8e8c7dda11f5d5cf90495f2e89d917a83509bc0 * Don't send an IPI if receiver already has a pending IPI. Atomically piggyback the new msg with pending msg. * IPI receiver looping on xchg() not required References: https://lkml.org/lkml/2013/11/25/232 Suggested-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Vineet Gupta <vgupta@synopsys.com> 
* Don't send an IPI if receiver already has a pending IPI.
  Atomically piggyback the new msg with pending msg.

* IPI receiver looping on xchg() not required

References: https://lkml.org/lkml/2013/11/25/232
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
ARC: [SMP] simplify IPI code 2013-12-23T06:35:04+00:00 Vineet Gupta vgupta@synopsys.com 2013-11-26T09:53:44+00:00 f2a4aa5646687f9a51616581221b1d348590d47e * ipi_data is just a word, no need to keep it as struct * find_next_bit() not needed to loop thru a 32bit word, ffs suffices 
* ipi_data is just a word, no need to keep it as struct

* find_next_bit() not needed to loop thru a 32bit word, ffs suffices
ARC: [SMP] cpu halt interface doesn't need "self" cpu-id 2013-12-23T06:35:04+00:00 Vineet Gupta vgupta@synopsys.com 2013-11-25T09:18:39+00:00 53dc110c97436dcf2a758091c98093657116e91c Signed-off-by: Vineet Gupta <vgupta@synopsys.com> 
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>