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-----Original Messages----- From: wuzhouhui wuzhouhui14@mails.ucas.ac.cn Sent Time: 2018-02-07 13:44:07 (Wednesday) To: centos@centos.org Cc: wuzhouhui14 wuzhouhui14@mails.ucas.ac.cn Subject: Adjust type of rw in submit_bio from int to unsigned long

Hi, I am a developer who worked on CentOS. Recently I am working on porting one of my block drivers from CentOS 6.x to CentOS 7.x. In newest kernel (kernel-3.10.0-693.17.1.el7) I found there is an issue in submit_bio()'s first argument: void submit_bio(int rw, struct bio *bio) The type of bi_rw of struct bio is unsigned long, and the number of enum rq_flags_bits also exceeds 32, so we should better using unsigned long for rw in submit_bio(), like: void submit_bio(unsigned long rw, struct bio *bio)