On Tue, Sep 08, 2020 at 10:10:07PM +0200, David Hildenbrand wrote: > IORESOURCE_MEM_DRIVER_MANAGED currently uses an unused PnP bit, which is > always set to 0 by hardware. This is far from beautiful (and confusing), > and the bit only applies to SYSRAM. So let's move it out of the > bus-specific (PnP) defined bits. > > We'll add another SYSRAM specific bit soon. If we ever need more bits for > other purposes, we can steal some from "desc", or reshuffle/regroup what we > have. > > Cc: Andrew Morton <[email protected]> > Cc: Michal Hocko <[email protected]> > Cc: Dan Williams <[email protected]> > Cc: Jason Gunthorpe <[email protected]> > Cc: Kees Cook <[email protected]> > Cc: Ard Biesheuvel <[email protected]> > Cc: Pankaj Gupta <[email protected]> > Cc: Baoquan He <[email protected]> > Cc: Wei Yang <[email protected]> > Cc: Eric Biederman <[email protected]> > Cc: Thomas Gleixner <[email protected]> > Cc: Greg Kroah-Hartman <[email protected]> > Cc: [email protected] > Signed-off-by: David Hildenbrand <[email protected]> > --- > include/linux/ioport.h | 4 +++- > kernel/kexec_file.c | 2 +- > mm/memory_hotplug.c | 4 ++-- > 3 files changed, 6 insertions(+), 4 deletions(-) > > diff --git a/include/linux/ioport.h b/include/linux/ioport.h > index 52a91f5fa1a36..d7620d7c941a0 100644 > --- a/include/linux/ioport.h > +++ b/include/linux/ioport.h > @@ -58,6 +58,9 @@ struct resource { > #define IORESOURCE_EXT_TYPE_BITS 0x01000000 /* Resource extended types */ > #define IORESOURCE_SYSRAM 0x01000000 /* System RAM (modifier) */ > > +/* IORESOURCE_SYSRAM specific bits. */ > +#define IORESOURCE_SYSRAM_DRIVER_MANAGED 0x02000000 /* Always detected > via a driver. */ > +
Can't you use BIT() here? thanks, greg k-h
