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 <[email protected]>
Cc: Peter Zijlstra (Intel) <[email protected]>
Cc: [email protected]
Signed-off-by: Vineet Gupta <[email protected]>

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

…

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

…

clk.h

…

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

…

dma-mapping.h

Merge branch 'akpm' (patches from Andrew)

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

dma.h

…

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

…

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

…

kgdb.h

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

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

kprobes.h

…

linkage.h

…

mach_desc.h

…

mcip.h

ARCv2: SMP: clocksource: Enable Global Real Time counter

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

mmu_context.h

…

mmu.h

ARCv2: MMUv4: TLB programming Model changes

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

module.h

…

mutex.h

…

page.h

…

perf_event.h

ARC: perf: support cache hit/miss ratio

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

pgalloc.h

…

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

…

segment.h

…

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

…

smp.h

…

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

…

syscall.h

…

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

…

tlb-mmu1.h

…

tlb.h

…

tlbflush.h

…

uaccess.h

ARCv2: Adhere to Zero Delay loop restriction

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

unaligned.h

…

unwind.h

…