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
