Magellan Linux

  • Back to homepage
    • /[pkg-src]/trunk/kernel26-alx/patches-2.6.21-r14/0007-2.6.21-sched-limit_policy_changes.patch

    Annotation of /trunk/kernel26-alx/patches-2.6.21-r14/0007-2.6.21-sched-limit_policy_changes.patch

    Parent Directory Parent Directory | Revision Log Revision Log

    Revision 447 - (hide annotations) (download)
    Tue Jan 22 17:55:52 2008 UTC (16 years, 3 months ago) by niro
    File size: 1532 byte(s) 
    -2.6.21-alx-r14 - fixed some natsemi errors on wys terminals
    1 niro 447 Many applications explicitly set SCHED_NORMAL on threads thus undoing the
    2     usefulness of the SCHED_ISO, SCHED_BATCH and SCHED_IDLEPRIO policies.
    3    
    4     For unprivileged users:
    5    
    6     Only allow non realtime policies to be downgraded from ISO->BATCH->IDLEPRIO
    7     but not back to NORMAL.
    8    
    9     Signed-off-by: Con Kolivas <kernel@kolivas.org>
    10    
    11     ---
    12     kernel/sched.c | 26 ++++++++++++++++++++++++++
    13     1 file changed, 26 insertions(+)
    14    
    15     Index: linux-2.6.21-ck2/kernel/sched.c
    16     ===================================================================
    17     --- linux-2.6.21-ck2.orig/kernel/sched.c 2007-05-14 19:30:31.000000000 +1000
    18     +++ linux-2.6.21-ck2/kernel/sched.c 2007-05-14 19:30:31.000000000 +1000
    19     @@ -4295,6 +4295,31 @@ recheck:
    20     if (param->sched_priority > p->rt_priority &&
    21     param->sched_priority > rlim_rtprio)
    22     return -EPERM;
    23     + } else {
    24     + switch (p->policy) {
    25     + /*
    26     + * Can only downgrade policies but not back to
    27     + * SCHED_NORMAL
    28     + */
    29     + case SCHED_ISO:
    30     + if (policy == SCHED_ISO)
    31     + goto out;
    32     + if (policy == SCHED_NORMAL)
    33     + return -EPERM;
    34     + break;
    35     + case SCHED_BATCH:
    36     + if (policy == SCHED_BATCH)
    37     + goto out;
    38     + if (policy != SCHED_IDLEPRIO)
    39     + return -EPERM;
    40     + break;
    41     + case SCHED_IDLEPRIO:
    42     + if (policy == SCHED_IDLEPRIO)
    43     + goto out;
    44     + return -EPERM;
    45     + default:
    46     + break;
    47     + }
    48     }
    49    
    50     /* can't change other user's priorities */
    51     @@ -4351,6 +4376,7 @@ recheck:
    52    
    53     rt_mutex_adjust_pi(p);
    54    
    55     +out:
    56     return 0;
    57     }
    58     EXPORT_SYMBOL_GPL(sched_setscheduler);