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efi/arm*: Use memremap() to create the persistent memmap mapping

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Instead of using ioremap_cache(), which is slightly inappropriate for
mapping firmware tables, and is not even allowed on ARM for mapping
regions that are covered by a struct page, use memremap(), which was
invented for this purpose, and will also reuse the existing kernel
direct mapping if the requested region is covered by it.

Signed-off-by: Ard Biesheuvel <[email protected]>
Signed-off-by: Matt Fleming <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Ard Biesheuvel 2016-04-25 21:06:41 +01:00 • committed by Ingo Molnar
commit 24d45d1dc2
1 changed files with 1 additions and 2 deletions
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3
drivers/firmware/efi/arm-runtime.c
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@ -105,8 +105,7 @@ static int __init arm_enable_runtime_services(void)
mapsize = efi.memmap.map_end - efi.memmap.map;
efi.memmap.map = (__force void *)ioremap_cache(efi.memmap.phys_map,
mapsize);
efi.memmap.map = memremap(efi.memmap.phys_map, mapsize, MEMREMAP_WB);
if (!efi.memmap.map) {
pr_err("Failed to remap EFI memory map\n");
return -ENOMEM;