Vineet Gupta 1097163870 ARCv2: spinlock/rwlock/atomics: reduce 1 instruction in exponential backoff ...

The increment of delay counter was 2 instructions:
Arithmatic Shfit Left (ASL) + set to 1 on overflow

This can be done in 1 using ROtate Left (ROL)

Suggested-by: Nigel Topham <ntopham@synopsys.com>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

2015-08-07 13:56:16 +05:30

..

arcregs.h

ARCv2: Fix the peripheral address space detection

2015-08-03 19:34:07 +05:30

asm-offsets.h

ARC: Generic Headers

2013-01-28 12:34:21 +05:30

atomic.h

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

2015-08-07 13:56:16 +05:30

barrier.h

ARCv2: barriers

2015-06-25 06:00:17 +05:30

bitops.h

ARC: Make ARC bitops "safer" (add anti-optimization)

2015-07-09 17:36:32 +05:30

bug.h

ARC: BUG() dumps stack after @msg (@msg now same as in generic BUG))

2014-10-13 14:46:18 +05:30

cache.h

ARCv2: SLC: Handle explcit flush for DMA ops (w/o IO-coherency)

2015-06-25 06:00:19 +05:30

cacheflush.h

ARC: fold ___flush_dcache_page into __flush_dcache_page

2015-05-19 11:27:13 +05:30

checksum.h

ARC: Checksum/byteorder/swab routines

2013-02-11 20:00:34 +05:30

clk.h

ARC: [DeviceTree] Convert some Kconfig items to runtime values

2013-02-15 23:15:56 +05:30

cmpxchg.h

ARC: add smp barriers around atomics per Documentation/atomic_ops.txt

2015-06-25 06:00:16 +05:30

current.h

ARC: remove extraneous __KERNEL__ guards

2014-10-13 14:46:20 +05:30

delay.h

ARCv2: Adhere to Zero Delay loop restriction

2015-06-22 14:06:56 +05:30

disasm.h

ARC: disassembly (needed by kprobes/kgdb/unaligned-access-emul)

2013-02-15 23:16:04 +05:30

dma-mapping.h

Merge branch 'akpm' (patches from Andrew)

2015-07-01 17:47:51 -07:00

dma.h

ARC: I/O and DMA Mappings

2013-02-15 23:15:54 +05:30

elf.h

ARCv2: Support for ARCv2 ISA and HS38x cores

2015-06-22 14:06:55 +05:30

entry-arcv2.h

ARCv2: Support for ARCv2 ISA and HS38x cores

2015-06-22 14:06:55 +05:30

entry-compact.h

ARC: intc: split into ARCompact ISA specific, common bits

2015-06-19 18:09:40 +05:30

entry.h

ARCv2: STAR 9000808988: signals involving Delay Slot

2015-06-22 14:06:55 +05:30

exec.h

ARC: Fundamental ARCH data-types/defines

2013-02-11 20:00:34 +05:30

futex.h

ARC: Add llock/scond to futex backend

2015-07-09 17:36:33 +05:30

io.h

Merge tag 'arc-4.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc

2015-07-01 09:24:26 -07:00

irq.h

ARCv2: SMP: Support ARConnect (MCIP) for Inter-Core-Interrupts et al

2015-06-22 14:06:56 +05:30

irqflags-arcv2.h

ARCv2: STAR 9000814690: Really Re-enable interrupts to avoid deadlocks

2015-06-22 14:06:55 +05:30

irqflags-compact.h

ARCv2: Support for ARCv2 ISA and HS38x cores

2015-06-22 14:06:55 +05:30

irqflags.h

ARCv2: Support for ARCv2 ISA and HS38x cores

2015-06-22 14:06:55 +05:30

Kbuild

mm: clean up per architecture MM hook header files

2015-07-17 16:39:53 -07:00

kdebug.h

ARC: Fundamental ARCH data-types/defines

2013-02-11 20:00:34 +05:30

kgdb.h

ARC: Update order of registers in KGDB to match GDB 7.5

2014-10-13 14:46:20 +05:30

kprobes.h

ARC: Remove explicit passing around of ECR

2013-06-26 15:30:50 +05:30

linkage.h

ARC: switch to generic ENTRY/END assembler annotations

2014-03-26 14:31:28 +05:30

mach_desc.h

arc: use common of_flat_dt_match_machine

2013-10-09 20:03:55 -05:00

mcip.h

ARCv2: SMP: clocksource: Enable Global Real Time counter

2015-06-22 14:06:57 +05:30

mmu_context.h

ARC: [SMP] TLB flush

2013-11-06 10:41:45 +05:30

mmu.h

ARCv2: MMUv4: TLB programming Model changes

2015-06-22 14:06:55 +05:30

module.h

ARC: DWARF2 .debug_frame based stack unwinder

2013-02-15 23:16:03 +05:30

mutex.h

ARC: SMP support

2013-02-15 23:16:02 +05:30

page.h

ARC: [mm] Make stack/heap Non-executable by default

2013-06-22 19:23:20 +05:30

perf_event.h

ARC: perf: support cache hit/miss ratio

2015-04-20 18:27:34 +05:30

pgalloc.h

arc: handle pgtable_page_ctor() fail

2013-11-15 09:32:16 +09:00

pgtable.h

ARCv2: MMUv4: TLB programming Model changes

2015-06-22 14:06:55 +05:30

processor.h

ARC: mm: document system mem map clearly

2015-06-19 18:09:29 +05:30

ptrace.h

ARC: Make pt_regs regs unsigned

2015-08-05 11:48:21 +05:30

sections.h

of/fdt: consolidate built-in dtb section variables

2014-04-30 00:59:13 -05:00

segment.h

ARC: uaccess friends

2013-02-11 20:00:31 +05:30

serial.h

ARC: Dynamically determine BASE_BAUD from DeviceTree

2015-02-02 17:08:37 +05:30

setup.h

ARC: RIP @running_on_hw

2014-10-13 14:46:17 +05:30

shmparam.h

ARC: [mm] Aliasing VIPT dcache support 4/4

2013-05-09 22:00:57 +05:30

smp.h

ARC: Allow SMP kernel to build/boot on UP-only infrastructure

2014-09-27 14:49:01 +05:30

spinlock_types.h

ARC: LLOCK/SCOND based rwlock

2015-08-04 09:26:33 +05:30

spinlock.h

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

2015-08-07 13:56:16 +05:30

stacktrace.h

ARC: Make arc_unwind_core accessible externally

2015-02-27 10:15:00 +05:30

string.h

ARC: remove extraneous __KERNEL__ guards

2014-10-13 14:46:20 +05:30

switch_to.h

ARC: Process-creation/scheduling/idle-loop

2013-02-11 20:00:38 +05:30

syscall.h

ARC: stop using pt_regs->orig_r8

2013-06-22 19:23:26 +05:30

syscalls.h

ARC: remove extraneous __KERNEL__ guards

2014-10-13 14:46:20 +05:30

thread_info.h

ARCv2: Support for ARCv2 ISA and HS38x cores

2015-06-22 14:06:55 +05:30

timex.h

ARC: Timers/counters/delay management

2013-02-11 20:00:39 +05:30

tlb-mmu1.h

ARC: Disintegrate arcregs.h

2013-06-22 13:46:42 +05:30

tlb.h

ARC: Disintegrate arcregs.h

2013-06-22 13:46:42 +05:30

tlbflush.h

ARC: [SMP] TLB flush

2013-11-06 10:41:45 +05:30

uaccess.h

ARCv2: Adhere to Zero Delay loop restriction

2015-06-22 14:06:56 +05:30

unaligned.h

ARC: rename kconfig option for unaligned emulation

2014-10-13 14:46:15 +05:30

unwind.h

ARC: DWARF2 .debug_frame based stack unwinder

2013-02-15 23:16:03 +05:30