It used to be true that we can have system RAM only on the first level
in the resourc tree. However, this is no longer holds for driver-managed
system RAM (i.e., dax/kmem and virtio-mem).
The function walk_mem_res() only consideres the first level and is
used in arch/x86/mm/ioremap.c:__ioremap_check_mem() only. We currently
fail to identify System RAM added by dax/kmem and virtio-mem as
"IORES_MAP_SYSTEM_RAM", for example, allowing for remapping of such
"normal RAM" in __ioremap_caller().
Let's find all busy IORESOURCE_MEM resources, making the function
behave similar to walk_system_ram_res().
Cc: Andrew Morton <a...@linux-foundation.org>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
Cc: Dan Williams <dan.j.willi...@intel.com>
Cc: Daniel Vetter <daniel.vet...@ffwll.ch>
Cc: Andy Shevchenko <andriy.shevche...@linux.intel.com>
Cc: Mauro Carvalho Chehab <mchehab+hua...@kernel.org>
Cc: Signed-off-by: David Hildenbrand <da...@redhat.com>
Cc: Dave Young <dyo...@redhat.com>
Cc: Baoquan He <b...@redhat.com>
Cc: Vivek Goyal <vgo...@redhat.com>
Cc: Dave Hansen <dave.han...@linux.intel.com>
Cc: Keith Busch <keith.bu...@intel.com>
Cc: Michal Hocko <mho...@suse.com>
Cc: Qian Cai <c...@lca.pw>
Cc: Oscar Salvador <osalva...@suse.de>
Cc: Eric Biederman <ebied...@xmission.com>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: Ingo Molnar <mi...@redhat.com>
Cc: Borislav Petkov <b...@alien8.de>
Cc: "H. Peter Anvin" <h...@zytor.com>
Cc: Tom Lendacky <thomas.lenda...@amd.com>
Cc: Brijesh Singh <brijesh.si...@amd.com>
Cc: x...@kernel.org
Cc: ke...@lists.infradead.org
Signed-off-by: David Hildenbrand <da...@redhat.com>
---
kernel/resource.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/resource.c b/kernel/resource.c
index 4efd6e912279..16e0c7e8ed24 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -470,7 +470,7 @@ int walk_mem_res(u64 start, u64 end, void *arg,
{
unsigned long flags = IORESOURCE_MEM | IORESOURCE_BUSY;
- return __walk_iomem_res_desc(start, end, flags, IORES_DESC_NONE, true,
+ return __walk_iomem_res_desc(start, end, flags, IORES_DESC_NONE, false,
arg, func);
}
--
2.29.2
