Commit 84557871 authored by Jens Axboe's avatar Jens Axboe
Browse files

io_uring: add end-of-bits marker and build time verify it 



Not easy to tell if we're going over the size of bits we can shove
in req->flags, so add an end-of-bits marker and a BUILD_BUG_ON()
check for it.

Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 067524e9

fs/io_uring.c

+4 −0
Original line number Diff line number Diff line
@@ -511,6 +511,9 @@ enum { 
	REQ_F_OVERFLOW_BIT,

	REQ_F_POLLED_BIT,

	REQ_F_BUFFER_SELECTED_BIT,



	/* not a real bit, just to check we're not overflowing the space */

	__REQ_F_LAST_BIT,

};



enum {
@@ -7998,6 +8001,7 @@ static int __init io_uring_init(void) 
	BUILD_BUG_SQE_ELEM(44, __s32,  splice_fd_in);



	BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST);

	BUILD_BUG_ON(__REQ_F_LAST_BIT >= 8 * sizeof(int));

	req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC);

	return 0;

};