LinuxKPI: Add IOMEM_ERR_PTR() to linux/io.h

[wulf]

Summary

The function creates an error pointer.

Sponsored by: Serenity Cyber Security, LLC
MFC after: 1 week

[bz]

sys/compat/linuxkpi/common/include/linux/io.h

535

That'll fail to compile I bet; at least on i386?

(a) given this is not ERR_PTR (despite it is defined to nothing on FreeBSD) we should add __iomem.

static inline void __iomem *
IOMEM_ERR_PTR(long error)
{
        return (void __iomem *)(intptr_t)error;
}

or if you wish (probably needs linux/err.h then):

#define IOMEM_ERR_PTR(_e) (void __iomem *)ERR_PTR(_e)

[wulf]

Make IOMEM_ERR_PTR sparse-friendly and convert to macro to match Linux