Re: [PATCH v2] scsi, block: fix duplicate bdi name registration crashes
From: Bart Van Assche <hidden>
Date: 2017-02-01 20:35:33
Also in:
linux-block, lkml
On Wed, 2017-02-01 at 11:32 -0800, Dan Williams wrote:
quoted hunk ↗ jump to hunk
diff --git a/include/linux/genhd.h b/include/linux/genhd.h index 76f39754e7b0..27e7e12c0c2d 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h@@ -167,6 +167,22 @@ struct blk_integrity { }; #endif /* CONFIG_BLK_DEV_INTEGRITY */ +struct disk_devt { + atomic_t count; + void (*release)(struct disk_devt *disk_devt); +}; + +static inline void put_disk_devt(struct disk_devt *disk_devt) +{ + if (disk_devt && atomic_dec_and_test(&disk_devt->count)) + disk_devt->release(disk_devt); +} + +static inline void get_disk_devt(struct disk_devt *disk_devt) +{ + if (disk_devt) + atomic_inc(&disk_devt->count); +}
The <linux/genhd.h> header file is included directly or indirectly in a huge number of source files. Since neither get_disk_devt() nor put_disk_devt() are called from the I/O path, please move these functions from <linux/genhd.h> into block/genhd.c to keep the compilation time of the kernel as short as possible. Thanks, Bart.