@@ -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. */
+
#define IORESOURCE_EXCLUSIVE 0x08000000 /* Userland may not map this resource */
#define IORESOURCE_DISABLED 0x10000000
@@ -103,7 +106,6 @@ struct resource {
#define IORESOURCE_MEM_32BIT (3<<3)
#define IORESOURCE_MEM_SHADOWABLE (1<<5) /* dup: IORESOURCE_SHADOWABLE */
#define IORESOURCE_MEM_EXPANSIONROM (1<<6)
-#define IORESOURCE_MEM_DRIVER_MANAGED (1<<7)
/* PnP I/O specific bits (IORESOURCE_BITS) */
#define IORESOURCE_IO_16BIT_ADDR (1<<0)
@@ -520,7 +520,7 @@ static int locate_mem_hole_callback(struct resource *res, void *arg)
/* Returning 0 will take to next memory range */
/* Don't use memory that will be detected and handled by a driver. */
- if (res->flags & IORESOURCE_MEM_DRIVER_MANAGED)
+ if (res->flags & IORESOURCE_SYSRAM_DRIVER_MANAGED)
return 0;
if (sz < kbuf->memsz)
@@ -105,7 +105,7 @@ static struct resource *register_memory_resource(u64 start, u64 size,
unsigned long flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
if (strcmp(resource_name, "System RAM"))
- flags |= IORESOURCE_MEM_DRIVER_MANAGED;
+ flags |= IORESOURCE_SYSRAM_DRIVER_MANAGED;
/*
* Make sure value parsed from 'mem=' only restricts memory adding
@@ -1160,7 +1160,7 @@ EXPORT_SYMBOL_GPL(add_memory);
*
* For this memory, no entries in /sys/firmware/memmap ("raw firmware-provided
* memory map") are created. Also, the created memory resource is flagged
- * with IORESOURCE_MEM_DRIVER_MANAGED, so in-kernel users can special-case
+ * with IORESOURCE_SYSRAM_DRIVER_MANAGED, so in-kernel users can special-case
* this memory as well (esp., not place kexec images onto it).
*
* The resource_name (visible via /proc/iomem) has to have the format
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 <akpm@linux-foundation.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Jason Gunthorpe <jgg@ziepe.ca> Cc: Kees Cook <keescook@chromium.org> Cc: Ard Biesheuvel <ardb@kernel.org> Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com> Cc: Baoquan He <bhe@redhat.com> Cc: Wei Yang <richardw.yang@linux.intel.com> Cc: Eric Biederman <ebiederm@xmission.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: kexec@lists.infradead.org Signed-off-by: David Hildenbrand <david@redhat.com> --- include/linux/ioport.h | 4 +++- kernel/kexec_file.c | 2 +- mm/memory_hotplug.c | 4 ++-- 3 files changed, 6 insertions(+), 4 deletions(-)