parisc-kernel-perf: BKL pushdown (b6917500) · Commits · e / devices / android_kernel_xiaomi_markw

arch/parisc/kernel/perf.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -46,6 +46,7 @@
		#include <linux/init.h>
		#include <linux/proc_fs.h>
		#include <linux/miscdevice.h>
		#include <linux/smp_lock.h>
		#include <linux/spinlock.h>

		#include <asm/uaccess.h>
		@@ -260,13 +261,16 @@ printk("Preparing to start counters\n");
		*/
		static int perf_open(struct inode inode, struct file file)
		{
		lock_kernel();
		spin_lock(&perf_lock);
		if (perf_enabled) {
		spin_unlock(&perf_lock);
		unlock_kernel();
		return -EBUSY;
		}
		perf_enabled = 1;
		spin_unlock(&perf_lock);
		unlock_kernel();

		return 0;
		}