On 01/14/2015 09:04 AM, Hanjun Guo wrote:

From: Mark Salter <redacted>

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().

Signed-off-by: Mark Salter <redacted>
CC: Leif Lindholm <redacted>
CC: Ard Biesheuvel <redacted>
[hj: update the change log]
Signed-off-by: Hanjun Guo <redacted>
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Tested-by: Mark Langsdorf <redacted>