lkml.org 
[lkml]   [2012]   [Dec]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [RFC GIT PULL] "Nuke 386-DX/SX support" changes for v3.8


Le 12/12/12 19:04, Linus Torvalds a écrit :
> On Tue, Dec 11, 2012 at 3:10 AM, Ingo Molnar <mingo@kernel.org> wrote:
>>
>> This tree removes ancient-386-CPUs support and thus zaps quite a
>> bit of complexity:
>
> Btw, I think we should probably at least consider taking this one step
> further, and remove the dear old FPU emulation support too. Remove
> CONFIG_MATH_EMULATION and all of arch/x86/math-emu, along with a lot
> of small special cases.
>
> Or do people still use the 486SX?

Yes, the RDC-R321x SoC which is supported by mainline actually needs
Math emulation to properly work.

>
> Now, the math emulation hasn't been all that fundamentally problematic
> (compared to lack of xadd etc), but it does result in some
> complexities in exception handling and ptrace (grep for HAVE_HWFP or
> "hard_math" or a number of other magic things). None of which have
> likely been tested at all in the last ten years, so who knows if it
> actually *works* or not.
>
> Maybe somebody could try booting with "no387". Does it actually work?

Ok, I could try that.
--
Florian
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2012-12-13 18:01    [W:0.062 / U:0.480 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site