lkml.org 
[lkml]   [2015]   [Jan]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [RFC V6 2/3] arm:add bitrev.h file to support rbit instruction
On Fri, Jan 09, 2015 at 08:40:56PM +0800, Wang, Yalin wrote:
> Oh, I see,
> How about change like this:
> + select HAVE_ARCH_BITREVERSE if ((CPU_V7M || CPU_V7) && !CPU_V6 && !CPU_V6K)
> I am not sure if I also need add some older CPU types like !CPU_ARM9TDMI && !CPU_ARM940T ?
>
> Another solution is:
> + select HAVE_ARCH_BITREVERSE if ((CPU_32V7M || CPU_32V7) && !CPU_32V6 && !CPU_32V5 && !CPU_32V4 && !CPU_32V4T && !CPU_32V3)
>
> By the way, I am not clear about the difference between CPU_V6 and CPU_V6K, could you tell me? :)

I think

select HAVE_ARCH_BITREVERSE if (CPU_32v7M || CPU_32v7) && !CPU_32v6

is sufficient - we don't support mixing pre-v6 and v6+ CPU architectures
into a single kernel.

--
FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up
according to speedtest.net.


\
 
 \ /
  Last update: 2015-01-14 18:01    [W:0.241 / U:0.192 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site