This patch adds cmpxchg16b support for x86-64, so software
can perform 128-bit atomic write/read.
CC: Keir Fraser
CC: Jan Beulich
CC: Andrew Cooper
Signed-off-by: Feng Wu
---
v7:
- Make the last two parameters of __cmpxchg16b() const
- Remove memory clobber
- Add run-time and build-build check
>>> On 11.09.15 at 10:28, wrote:
> --- a/xen/include/asm-x86/x86_64/system.h
> +++ b/xen/include/asm-x86/x86_64/system.h
> @@ -6,6 +6,37 @@
> (unsigned long)(n),sizeof(*(ptr
>
> /*
> + * Atomic 16 bytes compare and exchange. Compare OLD with MEM, if
> +
> -Original Message-
> From: Jan Beulich [mailto:jbeul...@suse.com]
> Sent: Tuesday, September 22, 2015 9:51 PM
> To: Wu, Feng
> Cc: Andrew Cooper; xen-devel@lists.xen.org; Keir Fraser
> Subject: Re: [PATCH v7 02/17] Add cmpxchg16b support for x86-64
> > +#define cmpxchg16b(ptr,o,n)
> \
>
