ARM64: allow late use of early_ioremap

Commit 0e63ea48b4d8 (arm64/efi: add missing call to early_ioremap_reset())
added a missing call to early_ioremap_reset(). This triggers a BUG if code
tries using early_ioremap() after the early_ioremap_reset(). This is a
problem for some ACPI code which needs short-lived temporary mappings
after paging_init() but before acpi_early_init() in start_kernel(). This
patch adds definitions for the __late_set_fixmap() and __late_clear_fixmap()
which avoids the BUG by allowing later use of early_ioremap().

CC: Leif Lindholm <[email protected]>
CC: Ard Biesheuvel <[email protected]>
Tested-by: Suravee Suthikulpanit <[email protected]>
Tested-by: Mark Langsdorf <[email protected]>
Tested-by: Jon Masters <[email protected]>
Tested-by: Robert Richter <[email protected]>
Tested-by: Timur Tabi <[email protected]>
Acked-by: Robert Richter <[email protected]>
Reviewed-by: Grant Likely <[email protected]>
Signed-off-by: Mark Salter <[email protected]>
Signed-off-by: Hanjun Guo <[email protected]>
Signed-off-by: Will Deacon <[email protected]>

0 files changed, 0 insertions, 0 deletions