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authorJuergen Gross <jgross@suse.com>2015-07-17 06:51:33 +0200
committerDavid Vrabel <david.vrabel@citrix.com>2015-08-20 12:24:22 +0100
commit2592dbbbf4c67501c2bd2dcf89c2b8924d592a9f (patch)
treede5834b2dfbd829951b8dc93c8ecd98b1d3b7de2 /include/asm-generic/early_ioremap.h
parent4b9c15377f96e241be347fd3bbeeff74fbad0b44 (diff)
mm: provide early_memremap_ro to establish read-only mapping
During early boot as Xen pv domain the kernel needs to map some page tables supplied by the hypervisor read only. This is needed to be able to relocate some data structures conflicting with the physical memory map especially on systems with huge RAM (above 512GB). Provide the function early_memremap_ro() to provide this read only mapping. Signed-off-by: Juergen Gross <jgross@suse.com> Acked-by: Konrad Rzeszutek Wilk <Konrad.wilk@oracle.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Diffstat (limited to 'include/asm-generic/early_ioremap.h')
-rw-r--r--include/asm-generic/early_ioremap.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/asm-generic/early_ioremap.h b/include/asm-generic/early_ioremap.h
index a5de55c04fb2..316bd043319e 100644
--- a/include/asm-generic/early_ioremap.h
+++ b/include/asm-generic/early_ioremap.h
@@ -11,6 +11,8 @@ extern void __iomem *early_ioremap(resource_size_t phys_addr,
unsigned long size);
extern void *early_memremap(resource_size_t phys_addr,
unsigned long size);
+extern void *early_memremap_ro(resource_size_t phys_addr,
+ unsigned long size);
extern void early_iounmap(void __iomem *addr, unsigned long size);
extern void early_memunmap(void *addr, unsigned long size);

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