Re: [PATCH] bitops: add _local bitops
- To: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
- Subject: Re: [PATCH] bitops: add _local bitops
- From: "H. Peter Anvin" <hpa@xxxxxxxxx>
- Date: Wed, 09 May 2012 12:23:30 -0700
- Cc: "Michael S. Tsirkin" <mst@xxxxxxxxxx>, Rob Landley <rob@xxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, x86@xxxxxxxxxx, Arnd Bergmann <arnd@xxxxxxxx>, David Howells <dhowells@xxxxxxxxxx>, Akinobu Mita <akinobu.mita@xxxxxxxxx>, Alexey Dobriyan <adobriyan@xxxxxxxxx>, Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxxx>, Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>, linux-doc@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-arch@xxxxxxxxxxxxxxx, Gleb Natapov <gleb@xxxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>, kvm@xxxxxxxxxxxxxxx, Avi Kivity <avi@xxxxxxxxxx>, Marcelo Tosatti <mtosatti@xxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
- In-reply-to: <20120509121940.459e93ba.akpm@linux-foundation.org>
- List-id: <linux-arch.vger.kernel.org>
- User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:11.0) Gecko/20120329 Thunderbird/11.0.1
On 05/09/2012 12:19 PM, Andrew Morton wrote:
>
> Secondly: can KVM just use __set_bit() and friends? I suspect those
> interfaces happen to meet your requirements. At least on architectures
> you care about.
>
__set_bit() and friends right now don't have optimization barriers,
meaning the compiler is free to move them around.
-hpa
--
To unsubscribe from this list: send the line "unsubscribe linux-arch" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
[Linux Kernel]
[Kernel Newbies]
[x86 Platform Driver]
[Share Photos]
[Security]
[Netfilter]
[Bugtraq]
[Linux FS]
[Photo]
[Yosemite]
[Yosemite Discussion]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Samba]
[Video 4 Linux]
[Device Mapper]
[Linux Resources]
