On Mon, Mar 19, 2018 at 02:00:02PM +0300, Alexey Brodkin wrote:
> diff --git a/arch/arc/kernel/process.c b/arch/arc/kernel/process.c
> index 5ac3b547453f..d7d3e16133d6 100644
> --- a/arch/arc/kernel/process.c
> +++ b/arch/arc/kernel/process.c
> @@ -47,7 +47,9 @@ SYSCALL_DEFINE0(arc_gettls)
> SYSCA
Hi Vineet,
On Wed, 2018-04-18 at 11:16 -0700, Vineet Gupta wrote:
> On 03/21/2018 04:54 AM, Alexey Brodkin wrote:
> > /*
> > > > * This is only for old cores lacking LLOCK/SCOND, which by
> > > > defintion
> > > > @@ -60,23 +62,48 @@ SYSCALL_DEFINE3(arc_usr_cmpxchg, int *, uaddr, int,
>
On 03/21/2018 04:54 AM, Alexey Brodkin wrote:
/*
* This is only for old cores lacking LLOCK/SCOND, which by defintion
@@ -60,23 +62,48 @@ SYSCALL_DEFINE3(arc_usr_cmpxchg, int *, uaddr, int,
expected, int, new)
/* Z indicates to userspace if operation succeded */
regs->s
Hi Vineet, Peter,
On Wed, 2018-03-21 at 14:54 +0300, Alexey Brodkin wrote:
> Hi Vineet,
>
> On Mon, 2018-03-19 at 11:29 -0700, Vineet Gupta wrote:
> > On 03/19/2018 04:00 AM, Alexey Brodkin wrote:
> > > arc_usr_cmpxchg syscall is supposed to be used on platforms
> > > that lack support of Load-Lo
Hi Vineet,
On Mon, 2018-03-19 at 11:29 -0700, Vineet Gupta wrote:
> On 03/19/2018 04:00 AM, Alexey Brodkin wrote:
> > arc_usr_cmpxchg syscall is supposed to be used on platforms
> > that lack support of Load-Locked/Store-Conditional instructions
> > in hardware. And in that case we mimic missing h
On 03/19/2018 04:00 AM, Alexey Brodkin wrote:
arc_usr_cmpxchg syscall is supposed to be used on platforms
that lack support of Load-Locked/Store-Conditional instructions
in hardware. And in that case we mimic missing hardware features
with help of kernel's sycall that "atomically" checks current
arc_usr_cmpxchg syscall is supposed to be used on platforms
that lack support of Load-Locked/Store-Conditional instructions
in hardware. And in that case we mimic missing hardware features
with help of kernel's sycall that "atomically" checks current
value in memory and then if it matches caller ex
