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Replace mutex with spinlock for tracepoint registration (#2882)

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Wang Han
2025-11-07 17:40:49 +08:00
committed by ShirkNeko
parent 53d763cdf9
commit da0e16bd26
1 changed files with 8 additions and 5 deletions
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13
kernel/sucompat.c
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@@ -13,6 +13,7 @@
#include <linux/types.h>
#include <linux/uaccess.h>
#include <linux/version.h>
#include <linux/spinlock.h>
#include <linux/sched/task_stack.h>
#include <asm/syscall.h>
#include <trace/events/syscalls.h>
@@ -440,11 +441,12 @@ static struct kprobe *pts_kp = NULL;
#ifdef CONFIG_KRETPROBES
static int tracepoint_reg_count = 0;
static DEFINE_MUTEX(tracepoint_reg_mutex);
static DEFINE_SPINLOCK(tracepoint_reg_lock);
static int syscall_regfunc_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
{
mutex_lock(&tracepoint_reg_mutex);
unsigned long flags;
spin_lock_irqsave(&tracepoint_reg_lock, flags);
if (tracepoint_reg_count < 1) {
// while install our tracepoint, mark our processes
unmark_all_process();
@@ -454,13 +456,14 @@ static int syscall_regfunc_handler(struct kretprobe_instance *ri, struct pt_regs
mark_all_process();
}
tracepoint_reg_count++;
mutex_unlock(&tracepoint_reg_mutex);
spin_unlock_irqrestore(&tracepoint_reg_lock, flags);
return 0;
}
static int syscall_unregfunc_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
{
mutex_lock(&tracepoint_reg_mutex);
unsigned long flags;
spin_lock_irqsave(&tracepoint_reg_lock, flags);
if (tracepoint_reg_count <= 1) {
// while uninstall our tracepoint, unmark all processes
unmark_all_process();
@@ -470,7 +473,7 @@ static int syscall_unregfunc_handler(struct kretprobe_instance *ri, struct pt_re
ksu_mark_running_process();
}
tracepoint_reg_count--;
mutex_unlock(&tracepoint_reg_mutex);
spin_unlock_irqrestore(&tracepoint_reg_lock, flags);
return 0;
}