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e6e335bf3a
linux/arch/arc/include/asm
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Vineet Gupta e6e335bf3a ARC: change return value of userspace cmpxchg assist syscall 
The original syscall only used to return errno to indicate if cmpxchg
succeeded. It was not returning the "previous" value which typical cmpxchg
callers are interested in to build their slowpaths or retry loops.
Given user preemption in syscall return path etc, it is not wise to
check this in userspace afterwards, but should be what kernel actually
observed in the syscall.

So change the syscall interface to always return the previous value and
additionally set Z flag to indicate whether operation succeeded or not
(just like ARM implementation when they used to have this syscall)
The flag approach avoids having to put_user errno which is nice given
the use case for this syscall cares mostly about the "previous" value.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2016-11-07 11:01:12 -08:00
..
arcregs.h ARC: change return value of userspace cmpxchg assist syscall 2016-11-07 11:01:12 -08:00
asm-offsets.h
atomic.h ARC: [plat-eznps] add missing atomic_fetch_xxx operations 2016-09-30 14:48:18 -07:00
barrier.h ARC: [plat-eznps] Use dedicated SMP barriers 2016-05-09 09:32:33 +05:30
bitops.h ARC: [plat-eznps] Use dedicated atomic/bitops/cmpxchg 2016-05-09 09:32:33 +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: IOC: use @ioc_enable not @ioc_exist where intended 2016-10-24 09:24:47 -07:00
cacheflush.h ARC: dma: ioremap: use phys_addr_t consistenctly in code paths 2016-03-19 14:34:09 +05:30
checksum.h ipv4: Update parameters for csum_tcpudp_magic to their original types 2016-03-13 23:55:13 -04:00
cmpxchg.h ARC: [plat-eznps] Use dedicated atomic/bitops/cmpxchg 2016-05-09 09:32:33 +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 ARC: dma: reintroduce platform specific dma<->phys 2016-03-19 14:34:09 +05:30
dma.h ARC: Add PCI support 2016-03-10 14:44:13 -06:00
dwarf.h ARC: dw2 unwind: add infrastructure for adding cfi pseudo ops to asm 2016-09-30 14:48:22 -07:00
elf.h ARC: fix build warning in elf.h 2016-10-19 14:38:53 -07:00
entry-arcv2.h ARCv2: Support for ARCv2 ISA and HS38x cores 2015-06-22 14:06:55 +05:30
entry-compact.h Fix typos 2016-05-30 10:07:32 +05:30
entry.h ARC: use correct offset in pt_regs for saving/restoring user mode r25 2016-08-19 10:44:13 -07:00
exec.h ARC: Fundamental ARCH data-types/defines 2013-02-11 20:00:34 +05:30
fb.h arc: Add our own implementation of fb_pgprotect() 2016-04-07 14:59:09 +05:30
futex.h ARC: change some branchs to jumps to resolve linkage errors 2015-08-20 18:53:15 +05:30
highmem.h ARC: mm: HIGHMEM: kmap API implementation 2015-10-28 19:49:04 +05:30
hugepage.h arch: fix has_transparent_hugepage() 2016-05-19 19:12:14 -07:00
io.h ARC: Add missing io barriers to io{read,write}{16,32}be() 2016-05-05 16:35:28 +05:30
irq.h ARC: irq: export some IRQs again 2016-05-09 09:32:30 +05:30
irqflags-arcv2.h ARCv2: fix local_save_flags 2016-09-30 14:48:25 -07:00
irqflags-compact.h ARC: Call trace_hardirqs_on() before enabling irqs 2016-08-10 10:14:07 -07:00
irqflags.h ARCv2: Support for ARCv2 ISA and HS38x cores 2015-06-22 14:06:55 +05:30
Kbuild PCI/MSI: Enable PCI_MSI_IRQ_DOMAIN support for ARC 2016-09-06 10:53:32 -05:00
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
kmap_types.h ARC: mm: HIGHMEM: kmap API implementation 2015-10-28 19:49:04 +05:30
kprobes.h ARC: Remove explicit passing around of ECR 2013-06-26 15:30:50 +05:30
linkage.h ARC: dw2 unwind: add infrastructure for adding cfi pseudo ops to asm 2016-09-30 14:48:22 -07:00
mach_desc.h ARC: smp: Rename platform hook @init_cpu_smp -> @init_per_cpu 2015-12-17 12:56:56 +05:30
mcip.h ARCv2: intc: untangle SMP, MCIP and IDU 2016-10-16 15:49:07 -07:00
mmu_context.h Fix typos 2016-05-30 10:07:32 +05:30
mmu.h ARC: mm: PAE40 support 2015-10-29 18:41:30 +05:30
mmzone.h ARC: support HIGHMEM even without PAE40 2016-05-05 16:35:46 +05:30
module.h ARC: module: elide loop to save reference to .eh_frame 2016-10-28 10:10:28 -07:00
mutex.h ARC: SMP support 2013-02-15 23:16:02 +05:30
page.h ARC: pae: STRICT_MM_TYPECHECKS was broken 2016-05-13 09:16:09 +05:30
pci.h ARC: Add PCI support 2016-03-10 14:44:13 -06:00
perf_event.h arc: perf: Enable generic "cache-references" and "cache-misses" events 2016-09-30 14:48:18 -07:00
pgalloc.h arc: get rid of superfluous __GFP_REPEAT 2016-06-24 17:23:52 -07:00
pgtable.h ARC: mm: fix build breakage with STRICT_MM_TYPECHECKS 2016-08-19 11:04:57 -07:00
processor.h Fix typos 2016-05-30 10:07:32 +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: boot log: refactor cpu name/release printing 2016-10-28 10:09:07 -07:00
shmparam.h ARC: [mm] Aliasing VIPT dcache support 4/4 2013-05-09 22:00:57 +05:30
smp.h Fix typos 2016-05-30 10:07:32 +05:30
spinlock_types.h ARC: LLOCK/SCOND based rwlock 2015-08-04 09:26:33 +05:30
spinlock.h locking/spinlock, arch: Update and fix spin_unlock_wait() implementations 2016-06-14 11:55:15 +02:00
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: syscall for userspace cmpxchg assist 2016-10-24 09:24:26 -07:00
thread_info.h Fix typos 2016-05-30 10:07:32 +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: thp: unbork !CONFIG_TRANSPARENT_HUGEPAGE build 2016-03-17 15:31:45 +05:30
uaccess.h ARC: uaccess: get_user to zero out dest in cause of fault 2016-09-13 17:49:41 -04:00
unaligned.h ARC: rename kconfig option for unaligned emulation 2014-10-13 14:46:15 +05:30
unwind.h ARC: dw2 unwind: Reinstante unwinding out of modules 2015-12-17 11:10:23 +05:30