| Message ID | 20190507080016.1945-1-shhuiw@foxmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | io_uring: use cpu_online() to check p->sq_thread_cpu instead of cpu_possible() | expand |
On 5/7/19 2:00 AM, Shenghui Wang wrote: > This issue is found by running liburing/test/io_uring_setup test. > > When test run, the testcase "attempt to bind to invalid cpu" would not > pass with messages like: > io_uring_setup(1, 0xbfc2f7c8), \ > flags: IORING_SETUP_SQPOLL|IORING_SETUP_SQ_AFF, \ > resv: 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000, \ > sq_thread_cpu: 2 > expected -1, got 3 > FAIL > > On my system, there is: > CPU(s) possible : 0-3 > CPU(s) online : 0-1 > CPU(s) offline : 2-3 > CPU(s) present : 0-1 > > The sq_thread_cpu 2 is offline on my system, so the bind should fail. > But cpu_possible() will pass the check. We shouldn't be able to bind > to an offline cpu. Use cpu_online() to do the check. > > After the change, the testcase run as expected: EINVAL will be returned > for cpu offlined. Applied, thanks.
diff --git a/fs/io_uring.c b/fs/io_uring.c index d91cbd53d3ca..718d7b873f4a 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -2472,7 +2472,7 @@ static int io_sq_offload_start(struct io_ring_ctx *ctx, nr_cpu_ids); ret = -EINVAL; - if (!cpu_possible(cpu)) + if (!cpu_online(cpu)) goto err; ctx->sqo_thread = kthread_create_on_cpu(io_sq_thread,
This issue is found by running liburing/test/io_uring_setup test. When test run, the testcase "attempt to bind to invalid cpu" would not pass with messages like: io_uring_setup(1, 0xbfc2f7c8), \ flags: IORING_SETUP_SQPOLL|IORING_SETUP_SQ_AFF, \ resv: 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000, \ sq_thread_cpu: 2 expected -1, got 3 FAIL On my system, there is: CPU(s) possible : 0-3 CPU(s) online : 0-1 CPU(s) offline : 2-3 CPU(s) present : 0-1 The sq_thread_cpu 2 is offline on my system, so the bind should fail. But cpu_possible() will pass the check. We shouldn't be able to bind to an offline cpu. Use cpu_online() to do the check. After the change, the testcase run as expected: EINVAL will be returned for cpu offlined. Signed-off-by: Shenghui Wang <shhuiw@foxmail.com> --- fs/io_uring.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)