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SMP: os_start needs to hold the KMM semaphore to prevent threads from allocating memory until the bring-up is complete

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This commit is contained in:
Gregory Nutt 2016-02-15 11:07:42 -06:00
parent 8ea1bc3188
commit fc842d740a
1 changed files with 18 additions and 0 deletions
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18
sched/init/os_start.c
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@ -726,7 +726,18 @@ void os_start(void)
#ifdef CONFIG_SMP
/* Start all CPUs *********************************************************/
/* A few basic sanity checks */
DEBUGASSERT(this_cpu() == 0 && CONFIG_MAX_TASKS > CONFIG_SMP_NCPUS);
/* Take the memory manager semaphore on this CPU so that it will not be
* available on the other CPUs until we have finished initialization.
*/
DEBUGVERIFY(kmm_trysemaphore());
/* Then start the other CPUs */
DEBUGVERIFY(os_smpstart());
#endif /* CONFIG_SMP */
@ -740,6 +751,13 @@ void os_start(void)
DEBUGVERIFY(os_bringup());
#ifdef CONFIG_SMP
/* Let other threads have access to the memory manager */
kmm_givesemaphore();
#endif /* CONFIG_SMP */
/* The IDLE Loop **********************************************************/
/* When control is return to this point, the system is idle. */