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scftorture: Move memory allocation outside of preempt_disable region.

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Memory allocations can not happen within regions with explicit disabled
preemption PREEMPT_RT. The problem is that the locking structures
underneath are sleeping locks.

Move the memory allocation outside of the preempt-disabled section. Keep
the GFP_ATOMIC for the allocation to behave like a "ememergncy
allocation".

Tested-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Reviewed-by: Boqun Feng <boqun.feng@gmail.com>
Tested-by: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Sebastian Andrzej Siewior 2024-11-08 11:39:33 +01:00 committed by Paul E. McKenney
parent 43082cd579
commit 64bdaf963c
1 changed files with 4 additions and 4 deletions
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8
kernel/scftorture.c
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@ -320,10 +320,6 @@ static void scftorture_invoke_one(struct scf_statistics *scfp, struct torture_ra
struct scf_check *scfcp = NULL;
struct scf_selector *scfsp = scf_sel_rand(trsp);
if (use_cpus_read_lock)
cpus_read_lock();
else
preempt_disable();
if (scfsp->scfs_prim == SCF_PRIM_SINGLE || scfsp->scfs_wait) {
scfcp = kmalloc(sizeof(*scfcp), GFP_ATOMIC);
if (!scfcp) {
@ -337,6 +333,10 @@ static void scftorture_invoke_one(struct scf_statistics *scfp, struct torture_ra
scfcp->scfc_rpc = false;
}
}
if (use_cpus_read_lock)
cpus_read_lock();
else
preempt_disable();
switch (scfsp->scfs_prim) {
case SCF_PRIM_RESCHED:
if (IS_BUILTIN(CONFIG_SCF_TORTURE_TEST)) {