arch_prepare_kprobe() is called from register_kprobe() via
prepare_kprobe(), or through register_aggr_kprobe(), both with the
kprobe_mutex held. Per the comment for get_kprobe():
/*
* This routine is called either:
* - under the 'kprobe_mutex' - during kprobe_[un]register().
* OR
* - with preemption disabled - from architecture specific code.
*/
As such, there is no need to disable preemption around the call to
get_kprobe(). Drop the same.
Reported-by: Nicholas Piggin <npig...@gmail.com>
Signed-off-by: Naveen N. Rao <naveen.n....@linux.vnet.ibm.com>
---
arch/powerpc/kernel/kprobes.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/arch/powerpc/kernel/kprobes.c b/arch/powerpc/kernel/kprobes.c
index bd7b1a03545948..88f42de681e1f8 100644
--- a/arch/powerpc/kernel/kprobes.c
+++ b/arch/powerpc/kernel/kprobes.c
@@ -158,9 +158,7 @@ int arch_prepare_kprobe(struct kprobe *p)
printk("Cannot register a kprobe on the second word of prefixed
instruction\n");
ret = -EINVAL;
}
- preempt_disable();
prev = get_kprobe(p->addr - 1);
- preempt_enable_no_resched();
/*
* When prev is a ftrace-based kprobe, we don't have an insn, and it
--
2.38.0
