* Re: [patch 2.6.13] i386: Ignore masked FPU exceptions
2005-09-13 8:55 [patch 2.6.13] i386: Ignore masked FPU exceptions Chuck Ebbert
@ 2005-09-13 20:47 ` Ondrej Zary
0 siblings, 0 replies; 2+ messages in thread
From: Ondrej Zary @ 2005-09-13 20:47 UTC (permalink / raw)
To: Chuck Ebbert; +Cc: linux-kernel, Andrew Morton, Linus Torvalds
Chuck Ebbert wrote:
> I think ignoring masked FPU exceptions on i386 is the right thing to do.
> Although there is no documentation available for Cyrix MII, I did find
> erratum F-7 for Winchip C6, "FPU instruction may result in spurious
> exception under certain conditions" which seems to indicate that this can
> happen.
>
> Ondrej, this patch on top of 2.6.13 should fix your Cyrix problems.
> Can you confirm? There was another bug which was already fixed,
> so this should be all that's needed now.
Thanks, it seems to work fine:
rainbow@pentium:~$ ./mprime
Main Menu
1. Test/Primenet
2. Test/User Information
3. Test/Vacation or Holiday
4. Test/Status
5. Test/Continue
6. Test/Exit
7. Advanced/Test
8. Advanced/Time
9. Advanced/P-1
10. Advanced/ECM
11. Advanced/Priority
12. Advanced/Manual Communication
13. Advanced/Unreserve Exponent
14. Advanced/Quit Gimps
15. Options/CPU
16. Options/Preferences
17. Options/Torture Test
18. Options/Benchmark
19. Help/About
20. Help/About PrimeNet Server
Your choice: 17
Beginning a continuous self-test to check your computer.
Please read stress.txt. Hit ^C to end this test.
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Torture Test ran 6 hours, 6 minutes - 0 errors, 0 warnings.
> Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com>
>
> arch/i386/kernel/traps.c | 5 +++--
> 1 files changed, 3 insertions(+), 2 deletions(-)
>
> --- 2.6.13a.orig/arch/i386/kernel/traps.c
> +++ 2.6.13a/arch/i386/kernel/traps.c
> @@ -804,8 +804,9 @@ void math_error(void __user *eip)
> cwd = get_fpu_cwd(task);
> swd = get_fpu_swd(task);
> switch (swd & ~cwd & 0x3f) {
> - case 0x000:
> - default:
> + case 0x000: /* No unmasked exception */
> + return;
> + default: /* Multiple exceptions */
> break;
> case 0x001: /* Invalid Op */
> /*
> __
> Chuck
>
--
Ondrej Zary
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