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| author | Thomas Gleixner <tglx@linutronix.de> | 2020-02-14 14:39:19 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-02-20 21:17:24 +0100 |
| commit | 4e139c7711633365ebb52fbb63905395522a8413 (patch) | |
| tree | df06f2cf410cfe8d1858ab4737ee25da7110f3bd /include | |
| parent | 66630058e56b26b3a9cf2625e250a8c592dd0207 (diff) | |
| download | linux-stable-4e139c7711633365ebb52fbb63905395522a8413.tar.gz linux-stable-4e139c7711633365ebb52fbb63905395522a8413.tar.bz2 linux-stable-4e139c7711633365ebb52fbb63905395522a8413.zip | |
sched: Provide cant_migrate()
Some code pathes rely on preempt_disable() to prevent migration on a non RT
enabled kernel. These preempt_disable/enable() pairs are substituted by
migrate_disable/enable() pairs or other forms of RT specific protection. On
RT these protections prevent migration but not preemption. Obviously a
cant_sleep() check in such a section will trigger on RT because preemption
is not disabled.
Provide a cant_migrate() macro which maps to cant_sleep() on a non RT
kernel and an empty placeholder for RT for now. The placeholder will be
changed to a proper debug check along with the RT specific migration
protection mechanism.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20200214161503.070487511@linutronix.de
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/kernel.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/kernel.h b/include/linux/kernel.h index 0d9db2a14f44..9b7a8d74a9d6 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -257,6 +257,13 @@ extern void __cant_sleep(const char *file, int line, int preempt_offset); #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0) +#ifndef CONFIG_PREEMPT_RT +# define cant_migrate() cant_sleep() +#else + /* Placeholder for now */ +# define cant_migrate() do { } while (0) +#endif + /** * abs - return absolute value of an argument * @x: the value. If it is unsigned type, it is converted to signed type first. |