lkml.org 
[lkml]   [2005]   [Aug]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [Question] arch-independent way to differentiate between user and kernel
From
Date
On Wed, 2005-08-03 at 12:48 +0200, Ingo Molnar wrote:
>
> i dont think there's any. user_mode(regs) gets the closest - it might
> make sense to generalize it over all arches.
>
> update_process_times() gets an arch-independent 'was the tick user-space
> or kernel-space' flag, so the best starting point would be to look at
> the output of:
>
> for N in `find . -name '*.c' | xargs grep update_process_times |
> grep arch`; do echo $N; done | grep update_process_times |
> sort | uniq -c
>
> which gives:
>
> 2 update_process_times()
> 1 update_process_times(CHOOSE_MODE(user_context(UPT_SP(regs)),
> 6 update_process_times(user);
> 1 update_process_times(user_mode(fp));
> 33 update_process_times(user_mode(regs));
> 2 update_process_times(user_mode_vm(regs));
>
> so ~33 calls use user_mode(regs), and the rest needs to be reviewed and
> possibly changed. Looks doable.

Ingo,

Thanks for the starting point. For now I'll submit a patch that doesn't
do the user_mode checks as discussed before. Then if I can find
something here, I'll send another patch on top of the first patch later.

-- Steve


-
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: 2005-08-03 14:30    [W:5.365 / U:0.012 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site