--- kernel/trace/trace.c

+++ kernel/trace/trace.c

@@ -2199,11 +2199,19 @@ tracing_write_stub(struct file *filp, co

return count;

}

+static loff_t tracing_seek(struct file *file, loff_t offset, int origin)

+{

+ if (file->f_mode & FMODE_READ)

+ return seq_lseek(file, offset, origin);

+ else

+ return 0;

+}

+

static const struct file_operations tracing_fops = {

.open = tracing_open,

.read = seq_read,

.write = tracing_write_stub,

- .llseek = seq_lseek,

+ .llseek = tracing_seek,

.release = tracing_release,

};