From a3df2e456c0f9db4cc7f2013eb0beb853945b937 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Mon, 9 Jan 2023 10:45:56 -0700 Subject: [PATCH] block: add a BUILD_BUG_ON() for adding more bio flags than we have space We have BIO_FLAG_LAST in the enum for bio specific flags, but it's not used to check that we're not exceeding the size of them. Add such a check. Reviewed-by: Damien Le Moal Signed-off-by: Jens Axboe --- block/bio.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/block/bio.c b/block/bio.c index ab59a491..d7fbc7a 100644 --- a/block/bio.c +++ b/block/bio.c @@ -1792,6 +1792,8 @@ static int __init init_bio(void) { int i; + BUILD_BUG_ON(BIO_FLAG_LAST > 8 * sizeof_field(struct bio, bi_flags)); + bio_integrity_init(); for (i = 0; i < ARRAY_SIZE(bvec_slabs); i++) { -- 2.7.4