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sched: Harden PREEMPT_DYNAMIC

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Use the new EXPORT_STATIC_CALL_TRAMP() / static_call_mod() to unexport
the static_call_key for the PREEMPT_DYNAMIC calls such that modules
can no longer update these calls.

Having modules change/hi-jack the preemption calls would be horrible.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra 2021-01-25 16:26:50 +01:00 • committed by Ingo Molnar
parent 73f44fe19d
commit ef72661e28
4 changed files with 8 additions and 8 deletions
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2
include/linux/sched.h
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@ -1880,7 +1880,7 @@ DECLARE_STATIC_CALL(cond_resched, __cond_resched);
static __always_inline int _cond_resched(void)
{
return static_call(cond_resched)();
return static_call_mod(cond_resched)();
}
#else