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| author |   Steven Rostedt <rostedt@goodmis.org> | 2014-07-23 11:28:26 -0400 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2014-07-28 10:04:14 +0200 |
| commit | c13db6b131a4388edca9867a1457b988b83902f8 (patch) | |
| tree | 8cff077493d86c6213dc952358122ccc52fda606 /kernel | |
| parent | sched: Robustify topology setup (diff) | |
| download | linux-dev-c13db6b131a4388edca9867a1457b988b83902f8.tar.xz linux-dev-c13db6b131a4388edca9867a1457b988b83902f8.zip | |
sched: Use macro for magic number of -1 for setparam
Instead of passing around a magic number -1 for the sched_setparam()
policy, use a more descriptive macro name like SETPARAM_POLICY.
[ based on top of Daniel's sched_setparam() fix ]
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Daniel Bristot de Oliveira<bristot@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/20140723112826.6ed6cbce@gandalf.local.home
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/sched/core.c | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 2a36a74c16ae..2676866b4394 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -3218,12 +3218,18 @@ __setparam_dl(struct task_struct *p, const struct sched_attr *attr) dl_se->dl_yielded = 0; } +/* + * sched_setparam() passes in -1 for its policy, to let the functions + * it calls know not to change it. + */ +#define SETPARAM_POLICY -1 + static void __setscheduler_params(struct task_struct *p, const struct sched_attr *attr) { int policy = attr->sched_policy; - if (policy == -1) /* setparam */ + if (policy == SETPARAM_POLICY) policy = p->policy; p->policy = policy; @@ -3572,11 +3578,8 @@ static int _sched_setscheduler(struct task_struct *p, int policy, .sched_nice = PRIO_TO_NICE(p->static_prio), }; - /* - * Fixup the legacy SCHED_RESET_ON_FORK hack, except if - * the policy=-1 was passed by sched_setparam(). - */ - if ((policy != -1) && (policy & SCHED_RESET_ON_FORK)) { + /* Fixup the legacy SCHED_RESET_ON_FORK hack. */ + if ((policy != SETPARAM_POLICY) && (policy & SCHED_RESET_ON_FORK)) { attr.sched_flags |= SCHED_FLAG_RESET_ON_FORK; policy &= ~SCHED_RESET_ON_FORK; attr.sched_policy = policy; @@ -3746,7 +3749,7 @@ SYSCALL_DEFINE3(sched_setscheduler, pid_t, pid, int, policy, */ SYSCALL_DEFINE2(sched_setparam, pid_t, pid, struct sched_param __user *, param) { - return do_sched_setscheduler(pid, -1, param); + return do_sched_setscheduler(pid, SETPARAM_POLICY, param); } /** |