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kprobes: Replace rp->free_instance with freelist

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Gets rid of rp->lock, and as a result kretprobes are now fully
lockless.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/159870623583.1229682.17472357584134058687.stgit@devnote2
This commit is contained in:
Peter Zijlstra
2020-08-29 22:03:56 +09:00
committed by Ingo Molnar
parent e563604a5f
commit 6e426e0fcd
2 changed files with 29 additions and 37 deletions
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8
include/linux/kprobes.h
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@@ -28,6 +28,7 @@
#include <linux/mutex.h>
#include <linux/ftrace.h>
#include <linux/refcount.h>
#include <linux/freelist.h>
#include <asm/kprobes.h>
#ifdef CONFIG_KPROBES
@@ -157,17 +158,16 @@ struct kretprobe {
int maxactive;
int nmissed;
size_t data_size;
struct hlist_head free_instances;
struct freelist_head freelist;
struct kretprobe_holder *rph;
raw_spinlock_t lock;
};
struct kretprobe_instance {
union {
struct llist_node llist;
struct hlist_node hlist;
struct freelist_node freelist;
struct rcu_head rcu;
};
struct llist_node llist;
struct kretprobe_holder *rph;
kprobe_opcode_t *ret_addr;
void *fp;