Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> --- include/linux/msi.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+) --- a/include/linux/msi.h +++ b/include/linux/msi.h @@ -2,6 +2,20 @@ #ifndef LINUX_MSI_H #define LINUX_MSI_H +/* + * This header file contains MSI data structures and functions which are + * only relevant for: + * - Interrupt core code + * - PCI/MSI core code + * - MSI interrupt domain implementations + * - IOMMU, low level VFIO, NTB and other justified exceptions + * dealing with low level MSI details. + * + * Regular device drivers have no business with any of these functions and + * especially storing MSI descriptor pointers in random code is considered + * abuse. The only function which is relevant for drivers is msi_get_virq(). + */ + #include <linux/spinlock.h> #include <linux/mutex.h> #include <linux/list.h>
